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Abidi JH, Elzain HE, Sabarathinam C, El Fehri RM, Farhat B, Ben Mammou A, Waterloo MJ, Yassin MA, Senapathi V. Integrated approach to understand the multiple natural and anthropogenic stresses on intensively irrigated coastal aquifer in the Mediterranean region. ENVIRONMENTAL RESEARCH 2024; 252:118757. [PMID: 38537744 DOI: 10.1016/j.envres.2024.118757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 02/29/2024] [Accepted: 03/19/2024] [Indexed: 04/06/2024]
Abstract
Understanding the major factors influencing groundwater chemistry and its evolution in irrigation areas is crucial for efficient irrigation management. Major ions and isotopes (δD-H2O together with δ18O-H2O) were used to identify the natural and anthropogenic factors contributing to groundwater salinization in the shallow aquifer of the Wadi Guenniche Plain (WGP) in the Mediterranean region of Tunisia. A comprehensive geochemical investigation of groundwater was conducted during both the low irrigation season (L-IR) and the high irrigation season (H-IR). The results show that the variation range and average concentrations of almost all the ions in both the L-IR and H-IR seasons are high. The groundwater in both seasons is characterized by high electrical conductivity and CaMgCl/SO4 and NaCl types. The dissolution of halite and gypsum, the precipitation of calcite and dolomite, and Na-Ca exchange are the main chemical reactions in the geochemical evolution of groundwater in the Wadi Guenniche Shallow Aquifer (WGSA). Stable isotopes of hydrogen and oxygen (δ18O-H2O and δD-H2O) indicate that groundwater in WGSA originated from local precipitation. In the H-IR season, the δ18O-H2O and δD-H2O values indicate that the groundwater experienced noticeable evaporation. The enriched isotopic signatures reveal that the WGSA's groundwater was influenced by irrigation return flow and seawater intrusion. The proportions of mixing with seawater were found to vary between 0.12% and 5.95%, and between 0.13% and 8.42% during the L-IR and H-IR seasons, respectively. Irrigation return flow and the associated evaporation increase the dissolved solids content in groundwater during the irrigation season. The long-term human activities (fertilization, irrigation, and septic waste infiltration) are the main drives of the high nitrate-N concentrations in groundwater. In coastal irrigation areas suffering from water scarcity, these results can help planners and policy makers understand the complexities of groundwater salinization to enable more sustainable management and development.
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Affiliation(s)
- Jamila Hammami Abidi
- Laboratory of Mineral Resources and Environment, Faculty of Sciences of Tunis, University of Tunis El Manar, 2092, Tunis, Tunisia
| | - Hussam Eldin Elzain
- Water Research Center, Sultan Qaboos University, PO Box 50, AlKhoud 123, Oman.
| | | | - Rihem Mejdoub El Fehri
- Laboratory of Geotechnical Engineering and Georisk, High National School of Engineering of Tunis, University of Tunis El Manar, 2092, Tunis, Tunisia
| | - Boutheina Farhat
- Laboratory of Mineral Resources and Environment, Faculty of Sciences of Tunis, University of Tunis El Manar, 2092, Tunis, Tunisia
| | - Abdallah Ben Mammou
- Laboratory of Mineral Resources and Environment, Faculty of Sciences of Tunis, University of Tunis El Manar, 2092, Tunis, Tunisia
| | | | - Mohamed A Yassin
- Interdisciplinary Research Center for Membranes and Water Security, KFUPM, 31261, Saudi Arabia; Department of Geosciences, College of Petroleum Engineering & Geosciences, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
| | - Venkatramanan Senapathi
- PG and Research Department of Geology, National College (Autonomous), Tiruchirappalli - 620001, Tamil Nadu, India
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Zhang Q, Qian H, Ren W, Xu P, Li W, Yang Q, Shang J. Salinization of shallow groundwater in the Jiaokou Irrigation District and associated secondary environmental challenges. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 908:168445. [PMID: 37949127 DOI: 10.1016/j.scitotenv.2023.168445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 10/13/2023] [Accepted: 11/07/2023] [Indexed: 11/12/2023]
Abstract
Understanding groundwater salinization of irrigation areas and related secondary environmental challenges is important for ensuring sustainable development. However, the mechanism under which groundwater salinization forms under the influence of long-term anthropogenic activities remains unclear. Therefore, this study analyzed the spatiotemporal variation in groundwater salinization and the underlying mechanism, and discussed the secondary environmental challenges in an irrigation area. The Jiaokou Irrigation District, North China, was adopted as a case study. The results showed a slight downward trend in groundwater salinity over the past two decades at a rate of 0.0229 g/L/y. Higher groundwater salinity was observed in areas with shallow groundwater depth. This correlation was mainly attributed to evaporative concentration, with secondary processes including natural weathering, depth of water-table, and fertilizer leaching. Drainage ditches may reduce groundwater salinity. Groundwater was transformed from freshwater to salt water and then to brackish water during the runoff process. The former transformation is mainly related to evaporation and fertilization. The latter transformation could be related to the inverse relationship between the distance to the Wei River and sediment permeability, with sediment permeability positively related to groundwater flow and leading to the discharge of salt into the Wei River. The secondary environmental challenges related to groundwater salinization in irrigation areas, mainly manifested in deterioration of irrigation water quality, soil salinization, and increased fluorine concentration. This study can act as a theoretical and practical reference for the development and utilization of water resources, ecological protection, and soil salinization in typical irrigation districts.
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Affiliation(s)
- Qiying Zhang
- School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, Shaanxi, China.
| | - Hui Qian
- School of Water and Environment, Chang'an University, Xi'an 710054, Shaanxi, China; Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of the Ministry of Education, Chang'an University, Xi'an 710054, Shaanxi, China.
| | - Wenhao Ren
- School of Water and Environment, Chang'an University, Xi'an 710054, Shaanxi, China; Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of the Ministry of Education, Chang'an University, Xi'an 710054, Shaanxi, China
| | - Panpan Xu
- School of Water and Environment, Chang'an University, Xi'an 710054, Shaanxi, China; Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of the Ministry of Education, Chang'an University, Xi'an 710054, Shaanxi, China
| | - Weiqing Li
- School of Water and Environment, Chang'an University, Xi'an 710054, Shaanxi, China; Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of the Ministry of Education, Chang'an University, Xi'an 710054, Shaanxi, China
| | - Qiaoyang Yang
- School of Water and Environment, Chang'an University, Xi'an 710054, Shaanxi, China; Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of the Ministry of Education, Chang'an University, Xi'an 710054, Shaanxi, China
| | - Jiatao Shang
- Wugong County Water Conservancy Bureau, Xianyang City, Shaanxi Province, China
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Park K, Mudgal A, Mudgal V, Sagi M, Standing D, Davies PA. Desalination, Water Re-use, and Halophyte Cultivation in Salinized Regions: A Highly Productive Groundwater Treatment System. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:11863-11875. [PMID: 37540002 DOI: 10.1021/acs.est.3c02881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/05/2023]
Abstract
Groundwater salinization is a problem affecting access to water in many world regions. Though desalination by conventional reverse osmosis (RO) can upgrade groundwater quality for drinking, its disadvantages include unmanaged brine discharge and accelerated groundwater depletion. Here, we propose a new approach combining RO, forward osmosis (FO), and halophyte cultivation, in which FO optimally adjusts the concentration of the RO reject brine for irrigation of Salicornia or Sarcocornia. The FO also re-uses wastewater, thus, reducing groundwater extraction and the wastewater effluent volume. To suit different groundwater salinities in the range 1-8 g/L, three practical designs are proposed and analyzed. Results include specific groundwater consumption (SGC), specific energy consumption (SEC), wastewater volume reduction, peak RO pressure, permeate water quality, efficiency of water resource utilization, and halophyte yield. Compared to conventional brackish water RO, the results show superior performance in almost all aspects. For example, SGC is reduced from 1.25 to 0.9 m3 per m3 of drinking water output and SEC is reduced from 0.79 to 0.70 kW h/m3 by a FO-RO-FO system treating groundwater of salinity 8 g/L. This system can produce 1.1 m3 of high-quality drinking water and up to 4.9 kg of edible halophyte per m3 of groundwater withdrawn.
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Affiliation(s)
- Kiho Park
- School of Chemical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea
| | - Anurag Mudgal
- Department of Mechanical Engineering, School of Technology, Pandit Deendayal Energy University, Gandhinagar 382426, India
| | - Varsha Mudgal
- Department of Mechanical Engineering, School of Technology, Pandit Deendayal Energy University, Gandhinagar 382426, India
| | - Moshe Sagi
- The Albert Katz Department of Dryland Biotechnologies, French Associates Institute for Agriculture and Biotechnology of Dryland, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, Beersheba 8499000, Israel
| | - Dominic Standing
- The Albert Katz Department of Dryland Biotechnologies, French Associates Institute for Agriculture and Biotechnology of Dryland, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, Beersheba 8499000, Israel
| | - Philip A Davies
- School of Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
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Farhat B, Chrigui R, Rebai N, Sebei A. Analysis of hydrochemical characteristics and assessment of organic pollutants (PAH and PCB) in El Fahs plain aquifer, northeast of Tunisia. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:84334-84356. [PMID: 37358774 DOI: 10.1007/s11356-023-28216-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Accepted: 06/07/2023] [Indexed: 06/27/2023]
Abstract
The availability of good quality groundwater constitutes a major concern in many developing countries. The El Fahs shallow aquifer, northeastern Tunisia, is an important source of water supply for various economic sectors in the agricultural region. The intensive exploitation of this groundwater has led to its quality degradation. In fact, assessment of water quality degradation is very useful in planning the conservation and management practices of water resources in this watershed. This research aims to evaluate the groundwater quality and its suitability for irrigation uses, identify the main processes to assess their chemical composition, and investigate the potential sources of persistent organic pollutants (POPs). The hydrogeochemical investigation is thus conducted by collecting groundwater samples and analyzing their physicochemical characteristics. Polycyclic aromatic hydrocarbons (16 PAHs) and polychlorinated biphenyls (7 PCBs) were determined in groundwaters from nine stations. The sampling took place in July 2020. The relative abundance of ions was Na > Mg > Ca > K for cations and Cl > SO4 > HCO3 for anions. The groundwater exhibits two predominant hydrochemical facies: Ca-Mg-Cl/SO4 and Na-Cl. The relevant recorded pollutant is nitrate, which was generally far above values of pollution thresholds indicating the influence by the intensive agricultural activity. The suitability for irrigation purposes was assessed using several parameters (EC, SAR, %Na, TH, PI, Mh, and Kr). As a matter of fact, the results mentioned that the majority of the samples are unsuitable for irrigation uses. An analysis of the organic pollutants indicates that the total PAH and PCB concentrations are above the permissible values. Therefore, a considerable predominance of naphthalene and PCB28 was observed in order to discriminate between pyrolitic and petrogenic PAH sources; low-molecular-weight (LPAH)/high-molecular-weight (HPAH) ratio was calculated. Results showed that PAHs were mainly of petrogenic origin. The results revealed also that the chemical composition of groundwater is influenced by evaporation process, ion exchange, and water-rock interaction during the flow. A high risk of organic contamination has been highlighted linked to anthropogenic activities which have exerted increasing pressure on groundwater quality. The presence of organic pollutants in groundwater is becoming a serious threat to the environment and human health.
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Affiliation(s)
- Boutheina Farhat
- Faculty of Sciences of Tunis, Department of Geology, Laboratory of Mineral Resources and Environment (LRME), University of Tunis El Manar, 2092 El Manar II, Tunis, Tunisia.
| | - Ranya Chrigui
- National School of Engineering of Tunis, LR14ES03 Geotechnical Engineering and Georisk Research Laboratory, University of Tunis El Manar, B.P. 37, Le Belvédère 1002, Tunis, Tunisia
| | - Noamen Rebai
- National School of Engineering of Tunis, LR14ES03 Geotechnical Engineering and Georisk Research Laboratory, University of Tunis El Manar, B.P. 37, Le Belvédère 1002, Tunis, Tunisia
| | - Abdelaziz Sebei
- Faculty of Sciences of Tunis, Department of Geology, Laboratory of Mineral Resources and Environment (LRME), University of Tunis El Manar, 2092 El Manar II, Tunis, Tunisia
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5
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Vespasiano G, Cianflone G, Marini L, De Rosa R, Polemio M, Walraevens K, Vaselli O, Pizzino L, Cinti D, Capecchiacci F, Barca D, Dominici R, Apollaro C. Hydrogeochemical and isotopic characterization of the Gioia Tauro coastal Plain (Calabria - southern Italy): A multidisciplinary approach for a focused management of vulnerable strategic systems. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 862:160694. [PMID: 36481154 DOI: 10.1016/j.scitotenv.2022.160694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Revised: 11/14/2022] [Accepted: 12/01/2022] [Indexed: 06/17/2023]
Abstract
This work pursues the hydro-geochemical and isotopic characterization of the complex groundwater system of the Gioia Tauro Plain, one of the most important industrialized and agricultural coastal areas of southern Italy. The anthropic pressure exposes the water resources at risk of depletion and quality degradation making the plain groundwater a system of high scientific and social interest. The plain is characterized by a shallow aquifer, mostly recharged by local rains and a deep aquifer apparently less influenced by local precipitation. Both aquifers are mainly Ca-HCO3 waters except for localized sectors where Na-HCO3, Na-Cl and Ca-SO4 waters are present. In deep aquifer, both prolonged interaction with sedimentary rocks, mainly deriving from the erosion of crystalline rocks, and direct cation exchange represent the primary factors controlling the formation of Na-HCO3 waters. Mixing processes between these waters and either connate brine and/or deep thermal waters contribute to the formation of isolated high salinity Na-Cl-rich waters. In shallow aquifer, inputs of N-rich sewage and agriculture-related contaminants, and SOx emissions in proximity of the harbor are responsible of the increasing nitrate and sulphate concentrations, respectively. The Cl/Br and NO3/Cl ratios highlight contamination mainly linked to agricultural activities and contribution of wastewater. Along the northern boundary, the warmest groundwater (Na-Cl[SO4]) were found close to a bend of the main strike-slip fault system, locally favouring the rising of B- and Li-rich deep waters, testifying the influence of geological-structural features on deep water circulation. Despite the high-water demand, a direct marine intrusion is localized in a very restricted area, where we observed an incipient groundwater-seawater mixing (seawater contribution ≤7 %). The qualitative and quantitative conditions of the shallow aquifer still have acceptable levels because of the relatively high recharge inflow. A reliable hydrogeochemical conceptual model, able to explain the compositional variability of the studied waters, is proposed.
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Affiliation(s)
- G Vespasiano
- Department of Biology, Ecology and Earth Sciences (DIBEST), University of Calabria, Via Ponte Bucci 4, Cubo 15B, 87036 Rende, Italy; E3 (Earth, Environment, Engineering) Soc. Coop. and Spin-Off of University of Calabria, Via Ponte Bucci, Cubo 15B, 87036 Rende, Italy
| | - G Cianflone
- Department of Biology, Ecology and Earth Sciences (DIBEST), University of Calabria, Via Ponte Bucci 4, Cubo 15B, 87036 Rende, Italy; E3 (Earth, Environment, Engineering) Soc. Coop. and Spin-Off of University of Calabria, Via Ponte Bucci, Cubo 15B, 87036 Rende, Italy.
| | - L Marini
- Steam Srl, Via Ponte a Piglieri 8, I-56121 Pisa, Italy
| | - R De Rosa
- Department of Biology, Ecology and Earth Sciences (DIBEST), University of Calabria, Via Ponte Bucci 4, Cubo 15B, 87036 Rende, Italy
| | - M Polemio
- CNR-IRPI, National Research Council, Research Institute for Hydrogeological Protection, Via Amendola 122 I, 70126 Bari, Italy
| | - K Walraevens
- Laboratory for Applied Geology and Hydrogeology, Department of Geology, Ghent University, 9000 Ghent, Belgium
| | - O Vaselli
- Department of Earth Sciences, University of Florence, Via G. La Pira 4, 50121 Firenze, Italy; CNR-IGG Institute of Geosciences and Earth Resources, Via G. La Pira 4, 50121 Firenze, Italy
| | - L Pizzino
- Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Roma 1, Via di Vigna Murata 605, 00143 Rome, Italy
| | - D Cinti
- Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Roma 1, Via di Vigna Murata 605, 00143 Rome, Italy
| | - F Capecchiacci
- Department of Earth Sciences, University of Florence, Via G. La Pira 4, 50121 Firenze, Italy; CNR-IGG Institute of Geosciences and Earth Resources, Via G. La Pira 4, 50121 Firenze, Italy; Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Napoli, Osservatorio Vesuviano, Via Diocleziano, 328, 80125 Napoli, NA
| | - D Barca
- Department of Biology, Ecology and Earth Sciences (DIBEST), University of Calabria, Via Ponte Bucci 4, Cubo 15B, 87036 Rende, Italy
| | - R Dominici
- Department of Biology, Ecology and Earth Sciences (DIBEST), University of Calabria, Via Ponte Bucci 4, Cubo 15B, 87036 Rende, Italy; E3 (Earth, Environment, Engineering) Soc. Coop. and Spin-Off of University of Calabria, Via Ponte Bucci, Cubo 15B, 87036 Rende, Italy
| | - C Apollaro
- Department of Biology, Ecology and Earth Sciences (DIBEST), University of Calabria, Via Ponte Bucci 4, Cubo 15B, 87036 Rende, Italy
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Heydarizad M, Pumijumnong N, Mansourian D, Anbaran ED, Minaei M. The deterioration of groundwater quality by seawater intrusion in the Chao Phraya River Basin, Thailand. ENVIRONMENTAL MONITORING AND ASSESSMENT 2023; 195:424. [PMID: 36821059 DOI: 10.1007/s10661-023-11023-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2022] [Accepted: 02/13/2023] [Indexed: 06/18/2023]
Abstract
The Chao Phraya River Deltaic Plain is the largest basin in Thailand and the second largest one in Southeast Asia after the Mekong River Delta. In recent decades, the groundwater quality in the Lower Chao Phraya River Basin in Thailand has deteriorated due to salinization caused by seawater intrusion. In the present study, hydrogeochemical and statistical methods were employed to determine the hydrochemical characteristics of the groundwater and to investigate the possible sources of salinity in the study region for the years 2008 and 2020. In addition, samples were taken from precipitation, sea water, and river water to analyze their hydrochemical properties. Then, they were used as input in the "Simmr" code in the R programming language to model the hydrochemical conditions of the study area and their evolution over time. The results indicated that in the non-coastal regions, water-rock interaction (mineral weathering and ion exchange), and brine/connate water infiltration affected the quality of the groundwater. However, the seawater intrusion was limited only to the coastal regions. Furthermore, the groundwater quality deteriorated from 2008 to 2020. Finally, using stepwise regression in the R language, the salinity of the groundwater was simulated and compared with the measured salinity data. The results obtained by the stepwise model were in close agreement with those obtained from the hydrochemical studies. This study confirmed seawater intrusion in the coastal aquifer as well as the deterioration of groundwater quality over time. To slow down this process and to achieve sustainable conditions, groundwater extraction should be reduced in the study region.
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Affiliation(s)
- Mojtaba Heydarizad
- Faculty of Environment and Resource Studies, Mahidol University, Nakhon Pathom, 73170, Thailand
| | - Nathsuda Pumijumnong
- Faculty of Environment and Resource Studies, Mahidol University, Nakhon Pathom, 73170, Thailand.
| | - Danial Mansourian
- Faculty of Science, Departments of Geology and Environment, Ghent University, Ghent, Belgium
| | - Elham Darbagh Anbaran
- Department of Geography, Ferdowsi University of Mashhad, Mashhad, Iran
- Geographic Information Science/System and Remote Sensing Laboratory (GISSRS: Lab), Ferdowsi University of Mashhad, Mashhad, Iran
| | - Masoud Minaei
- Department of Geography, Ferdowsi University of Mashhad, Mashhad, Iran
- Geographic Information Science/System and Remote Sensing Laboratory (GISSRS: Lab), Ferdowsi University of Mashhad, Mashhad, Iran
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Sun Q, Gao M, Wen Z, Hou G, Dang X, Liu S, Zhao G. Hydrochemical evolution processes of multiple-water quality interfaces (fresh/saline water, saline water/brine) on muddy coast under pumping conditions. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 857:159297. [PMID: 36220467 DOI: 10.1016/j.scitotenv.2022.159297] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 09/06/2022] [Accepted: 10/03/2022] [Indexed: 06/16/2023]
Abstract
A thorough understanding of the evolution of coastal brine-bearing groundwater systems under the influence of human activities contributes to the sustainable use of coastal groundwater resources. Therefore, this study comprehensively investigated the processes associated with hydrochemical changes in groundwater during brine exploitation based on long-term monitoring data. The dataset comprised 102 samples (including groundwater, seawater, rain and river samples) collected from 1966 to 2021 to capture the hydrochemical variability. Significant changes in the brine water table and concentration between the pre-overexploitation period (1965-2000) and the exploitation period (2000-2021) are observed. From the relationship between stable isotope (δ18O and δ2H) values and Cl- contents, shallow saline water (SSW) near the drawdown cone (with δ18O and δ2H values of -4.66 ‰ ~ -3.57 ‰ and - 42.1 ‰ ~ -32.8 ‰, respectively) is similar geochemically to the brine inside the drawdown cone (with values of -4.30 ‰ ~ -3.10 ‰ and - 39.0 ‰ ~ -32.3 ‰, respectively), indicating that the SSW has a recharge effect on the underground brine. The delta values of major cations were calculated to analyze the hydrochemical processes at different water quality interfaces (saline/freshwater interface, salinewater/brine interface). The results demonstrated that the SSW and deep saline water (DSW) at the offshore brine/saline water interface undergo seawater intrusion, where SSW undergoes a salinization process with cation exchange (Na+ is exchanged for Ca2+ and Mg2+ in clay), while DSW undergoes a freshening process. The SSW at the saline/freshwater interface is affected by freshwater pumping, and the DSW undergoes a salinization process influenced by brine intrusion presenting the common salinization process with cation exchange. The hydrochemical model shows that the brine concentration recovered during the restricted exploitation stage due to the dissolution of gypsum and halite. If no measures are taken to restrict exploitation, then brine will eventually be replaced by saline water.
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Affiliation(s)
- Qiming Sun
- Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, Wuhan 430074, China; Qingdao Institute of Marine Geology, CGS, Qingdao 266237, China; Chinese Academy of Geological Sciences, Beijing 100037, China
| | - Maosheng Gao
- Qingdao Institute of Marine Geology, CGS, Qingdao 266237, China; Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology, Qingdao 266071, China.
| | - Zhang Wen
- Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
| | - Guohua Hou
- Qingdao Institute of Marine Geology, CGS, Qingdao 266237, China; Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology, Qingdao 266071, China
| | - Xianzhang Dang
- Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, Wuhan 430074, China; Qingdao Institute of Marine Geology, CGS, Qingdao 266237, China; Chinese Academy of Geological Sciences, Beijing 100037, China
| | - Sen Liu
- Yangtai Institute of Coastal Zone Research, Chinese Academy of Science, China
| | - Guangming Zhao
- Qingdao Institute of Marine Geology, CGS, Qingdao 266237, China; Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology, Qingdao 266071, China
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8
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Islam M, Van Camp M, Hossain D, Sarker MMR, Bhuiyan MAQ, Karim MM, Walraevens K. Hydrogeochemical processes and groundwater quality of over-exploited Dupi Tila aquifer in Dhaka city, Bangladesh. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:74458-74479. [PMID: 35639316 DOI: 10.1007/s11356-022-20838-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Accepted: 05/11/2022] [Indexed: 06/15/2023]
Abstract
Dhaka is one of the highly populated cities in the world. Increased urbanization and population growth in Dhaka are mostly dependent on groundwater, with 78% of the supply water coming from the Plio-Pleistocene Dupi Tila aquifer. This research was conducted with the objectives of identifying ion chemistry, hydrochemical processes and their relationship to groundwater quality and finding out the impact of over-exploitation on Dupi Tila aquifer. Three consecutive semi-confined aquifers have been delineated up to the explored depth: the Upper Dupi Tila aquifer (UDA), Middle Dupi Tila aquifer (MDA) and Lower Dupi Tila aquifer (LDA). Hydrogeochemical processes and water quality have been inferred from bivariate plots, correlation of major ions, piper plot and stable isotopes analysis. The total dissolved solids show an increasing downwards trend from an average of 267 mg/l in UDA to an average of 284 mg/l in LDA. Waters in all three aquifers as well as surface water (SW) are mainly of Ca/Mg-HCO3 type. The weathering of aluminosilicates controls the concentration of the major ions. Even though there is a significant decline in piezometric level both in UDA (> -85 m Public Works Department reference datum (PWD)) and MDA (> -65 m PWD), there is no evidence of groundwater recharge through direct infiltration from the river. The stable isotopes indicate most of the UDA, MDA and LDA waters are mainly from local precipitation. Increasingly enriched mean values for stable isotopes for the subsequent aquifers UDA, MDA and LDA, as well as increasing PCO2 for UDA < MDA < LDA, indicate increasingly warmer recharge conditions. The overall groundwater quality in the aquifers is good. At present, we have no indication that groundwater exploitation has altered groundwater quality of the Dupi Tila aquifer. Therefore, it is of vital importance to regularly monitor water quality for the purposes in order to timely detect any potential water quality alteration that could be aggravated by the vast decline in piezometric level, in view of the long-term sustainable development of the groundwater resources of this city.
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Affiliation(s)
- Mazeda Islam
- Laboratory for Applied Geology and Hydrogeology, Department of Geology, Ghent University, 9000, Ghent, Belgium.
- Department of Geological Sciences, Jahangirnagar University, Savar, Dhaka, Bangladesh.
| | - Marc Van Camp
- Laboratory for Applied Geology and Hydrogeology, Department of Geology, Ghent University, 9000, Ghent, Belgium
| | - Delwar Hossain
- Department of Geological Sciences, Jahangirnagar University, Savar, Dhaka, Bangladesh
| | - Md Mizanur Rahman Sarker
- Laboratory for Applied Geology and Hydrogeology, Department of Geology, Ghent University, 9000, Ghent, Belgium
- Department of Geological Sciences, Jahangirnagar University, Savar, Dhaka, Bangladesh
| | | | - Md Masud Karim
- Isotope Hydrology Division, Bangladesh Atomic Energy Commission, Dhaka, Bangladesh
| | - Kristine Walraevens
- Laboratory for Applied Geology and Hydrogeology, Department of Geology, Ghent University, 9000, Ghent, Belgium
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Boufekane A, Maizi D, Madene E, Busico G, Zghibi A. Hybridization of GALDIT method to assess actual and future coastal vulnerability to seawater intrusion. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 318:115580. [PMID: 35759962 DOI: 10.1016/j.jenvman.2022.115580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 05/09/2022] [Accepted: 06/17/2022] [Indexed: 06/15/2023]
Abstract
In the recent years, the coastal aquifer of Jijel plain (North Algeria) located on the south of the Mediterranean Sea was utilized for cities growth and agricultural development of the region. Consequently, overexploitation and seawater intrusion were identified as major risks to the groundwater resource. In this work, a new approach integrating groundwater vulnerability method and numerical model for predicting the actual and future seawater is proposed. The groundwater vulnerability assessment has been performed by applying the GALDIT method using GIS and the MODFLOW model was used to simulate the actual and future groundwater level of the aquifer over the period 2020-2050. Three scenarios were simulated under water demand and climate conditions (drought, recharge) to obtain the changes in the groundwater level variation. The results of the GALDIT model application to the actual conditions (year 2020) showed that the high class of groundwater vulnerability is located in the coastal fringe and the terminal stretches of wadis where the seawater intrusion limit is located at a distance range between 840 and 1420 m from the shoreline. However, the results for predicting future groundwater vulnerability showed that the scenario which proposed the artificial recharge basins, although predicting a worrying situation compared to the actual condition, has the best figure of the groundwater vulnerability assessment and seawater intrusion despite the other two scenarios. In this case the limit in the year 2050 is located between distances of 850-1640 m from the shoreline with a forward speed of seawater intrusion of 1-8 m/year, compared to the reference year 2020. This showed that groundwater level variation and recharge were the key factors in controlling groundwater vulnerability to seawater intrusion. The presented new approach can be used to mapping the actual and future groundwater vulnerability assessment to seawater intrusion and groundwater resources management in any coastal areas worldwide.
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Affiliation(s)
- Abdelmadjid Boufekane
- Geo-Environment Laboratory, Department of Geology, Faculty of Earth Sciences and Country Planning, University of Sciences and Technology Houari Boumediene, 16111, Algiers, Algeria.
| | - Djamel Maizi
- Geo-Environment Laboratory, Department of Geology, Faculty of Earth Sciences and Country Planning, University of Sciences and Technology Houari Boumediene, 16111, Algiers, Algeria
| | - Elaid Madene
- GEE Research Laboratory, Ecole Nationale Supérieure d'Hydraulique de Blida, Blida, Algeria
| | - Gianluigi Busico
- DiSTABiF - Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, Campania 7 University "Luigi Vanvitelli", Via Vivaldi 43, 81100 Caserta, Italy
| | - Adel Zghibi
- LR01ES06 Laboratory of Geological Resources and Environment, Department of Geology, Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis-El Manar 2092, Tunisia
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10
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Elmeknassi M, Bouchaou L, El Mandour A, Elgettafi M, Himi M, Casas A. Multiple stable isotopes and geochemical approaches to elucidate groundwater salinity and contamination in the critical coastal zone: A case from the Bou-areg and Gareb aquifers (North-Eastern Morocco). ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 300:118942. [PMID: 35134425 DOI: 10.1016/j.envpol.2022.118942] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 12/13/2021] [Accepted: 01/30/2022] [Indexed: 06/14/2023]
Abstract
Mediterranean areas are characterized by complex hydrogeological systems, where water resources are faced with several issues such as salinity and pollution. Fifty-one water samples were gathered from the Bou-areg coastal and the Gareb aquifers to evaluate the source of water salinity and to reveal the processes of the different sources of pollution using a variety of chemical and isotopic indicators (δ2H-H2O, δ18O-H2O, δ34S-SO4, and δ18O-SO4). The results of the hydrochemical analysis of water samples show that the order of dominated elements is Cl- > HCO3- > SO42- > NO3- and Na+ > Ca2+ > Mg2+ > K+ and evidenced extremely high salinity levels (EC up to 22000 μS/cm). All samples exceeded the WHO drinking water guidelines, making them unfit for human consumption. Ion ratio diagrams, isotopic results, and graphical comparing indicate that the mineralization of groundwater in the area, is controlled by carbonate dissolution, evaporite dissolution, ion exchange, and sewage invasion. The return of irrigation water plays a significant role as well in the groundwater recharge and its mineralization by fertilizers mainly. Evaporites (Gypsum), sewage, and fertilizers constitute the main sources of sulfates in the investigated water resources. These scientific results will be an added value for decision-makers to more improve the sustainable management of groundwater in water-stressed regions. The use of chemical and isotopic tracers once again shows their relevance in such zones where systematic monitoring is lacking.
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Affiliation(s)
- Malak Elmeknassi
- GeoSciencesSemlalia Laboratory, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakesh, 40000, Morocco.
| | - Lhoussaine Bouchaou
- Applied Geology and Geo-Environment Laboratory, Faculty of Sciences, Ibn Zohr University, Agadir, 80000, Morocco; Mohammed VI Polytechnic University, International Water Research Institute, Benguerir, 43150, Morocco
| | - Abdennabi El Mandour
- GeoSciencesSemlalia Laboratory, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakesh, 40000, Morocco; Mohamed VI Museum for the Civilization of Water in Morocco, Ministry of Habous and Islamic Affairs, Marrakesh, 40000, Morocco
| | - Mohammed Elgettafi
- Mohamed First University Multidisciplinary Faculty of Nador, LCM2E Lab Géo-Environnement et Santé, BP 300 Selouane, 62702, Morocco
| | - Mahjoub Himi
- Earth Sciences Faculty, University of Barcelona, Marti i Franquès, s/n, 08028, Barcelona, Spain
| | - Albert Casas
- Earth Sciences Faculty, University of Barcelona, Marti i Franquès, s/n, 08028, Barcelona, Spain
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11
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Sola F, Vallejos A. Long and short-term cation exchange linked to a negative hydraulic barrier in a coastal aquifer. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 819:152013. [PMID: 34852252 DOI: 10.1016/j.scitotenv.2021.152013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 10/25/2021] [Accepted: 11/23/2021] [Indexed: 06/13/2023]
Abstract
Saltwater extraction in coastal aquifers generates a negative hydraulic barrier that prevents marine intrusion and produces a general freshening landward from this barrier. In the Andarax delta aquifer, SE Spain, two instances of saltwater extraction were performed and their effect on the aquifer hydrochemistry was studied. 14C groundwater dating, together with chemical analysis, reflects the presence of waters with different infiltration ages. Old marine groundwater (~10 ky) must be the remains of marine intrusion generated during the Holocene transgression at the same time the delta was formed. The freshening induced by the saltwater extraction triggers cation exchange between the aquifer substratum and groundwater. Unlike what is described in other examples of cation exchange in coastal aquifers, in the Andarax delta the freshening causes an exchange between Mg, which is released into the groundwater, and Na, which is held in the clay mineral structural unit. This process is reverted the moment the hydraulic barrier stops acting. Short saltwater pumping-stopping cycles generate fast inversions in this exchange chemical reaction. At the same time, a clear excess of Ca ion can be seen in all the groundwater samples. This excess is attributed to the release of this ion resulting from the overall marine intrusion in this area during the Holocene transgression. Contrasting what occurs with the Na-Mg exchange, the Na-Ca exchange process is more long-lasting in time.
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Affiliation(s)
- Fernando Sola
- Water Resources and Environmental Geology, Department of Biology & Geology, University of Almería, Almería 04120, Spain
| | - Angela Vallejos
- Water Resources and Environmental Geology, Department of Biology & Geology, University of Almería, Almería 04120, Spain.
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12
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Different Ground Subsidence Contributions Revealed by Integrated Discussion of Sentinel-1 Datasets, Well Discharge, Stratigraphical and Geomorphological Data: The Case of the Gioia Tauro Coastal Plain (Southern Italy). SUSTAINABILITY 2022. [DOI: 10.3390/su14052926] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Groundwater is the main water supply for agricultural and industrial needs in many coastal plains worldwide. Groundwater depletion often triggers land subsidence, which threatens manmade infrastructure and activities and aggravates other geohazards. We applied a multi-temporal interferometric synthetic aperture radar technique to Sentinel-1 datasets to detect ground motion in the Gioia Tauro plain (Calabria, Southern Italy) from 2018 to 2021. The InSAR data were analysed through the integrated use of groundwater head, stratigraphical and geomorphological data, and land use information to distinguish the potential subsidence divers. The results show that subsiding areas, with a mean rate of about 10 mm/yr, are in the middle of the plain, and their location is influenced by the spatial distribution of compressible sediments included in the shallow aquifer. Furthermore, the subsidence arrangement is spatially accordant with the main groundwater depression area, which can be ascribed to the ongoing and increasing water pumping for predominantly agricultural usage. We also observed that subsidence (up to 10 mm/yr) affects the western dock of the Gioia Tauro harbour, in front of which, in very shallow water, are two submarine canyon heads already affected by slides in the past.
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Identifying the Major Hydrogeochemical Factors Governing Groundwater Chemistry in the Coastal Aquifers of Southwest Bangladesh Using Statistical Analysis. HYDROLOGY 2022. [DOI: 10.3390/hydrology9020020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
People in the southwestern (SW) coastal part of Bangladesh are suffering from a severe freshwater crisis due to saline groundwater at a shallow depth. Fresh groundwater below a 200 m depth is an option, but it is costly to construct deep tubewells for the local inhabitants. The processes of salinization and freshening were previously identified using conventional methods. In this study, we brought new insight into these processes by analyzing existing datasets using multivariate statistics to identify the factors affecting groundwater chemistry. Cluster analysis (CA) revealed three major clusters. Cluster A corresponded to saline (NaCl-type) water. Cluster B was also saline (NaCl-type) water but showed mixing effects. Cluster C was fresh groundwater (NaHCO3-type) and isolated. The hydrochemical characteristics of clusters A, B and C compared remarkably well with the groundwaters from the upper shallow aquifer (USA), lower shallow aquifer (LSA) and deep aquifer (DA), respectively. Factor analysis (FA) showed that 75% of the total variance was influenced by evaporate dissolution, carbonate dissolution/precipitation, cation exchange and anthropogenic pollution to some extent. Therefore, the integrated approach showed the validity of applying multivariate statistical techniques to infer the dominant hydrochemistry and to characterize and understand a complicated hydrogeological system.
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Islam ARMT, Pal SC, Chowdhuri I, Salam R, Islam MS, Rahman MM, Zahid A, Idris AM. Application of novel framework approach for prediction of nitrate concentration susceptibility in coastal multi-aquifers, Bangladesh. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 801:149811. [PMID: 34467937 DOI: 10.1016/j.scitotenv.2021.149811] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2021] [Revised: 07/31/2021] [Accepted: 08/17/2021] [Indexed: 06/13/2023]
Abstract
This study aims to construct a novel framework approach for predicting and mapping nitrate concentration susceptibility in the coastal multi-aquifers of Bangladesh by coupling the K-fold cross-validation method and novel ensemble learning algorithms, including Boosting, Bagging and Random Forest (RF). In total, 286 nitrate sampling sites were employed in the model work. The dataset was demarcated into a 75:25 ratio for model construction (75% 3-fold ≅ 214 sites) and (25% 1-fold ≅ 72 sites) for model validation using the 4-fold cross-validation schemes. A total of 14 groundwater causative factors including salinity, depth, pH, EC, As, HCO3-, F-, Cl-, SO42-, PO42-, Na+, K+, Mg2+, and Ca2+ were adopted for the construction of the proposed models. OneR relative importance model was employed to choose and rank critical factors for spatial nitrate modeling. The results showed that depth, pH and As are the most influential causative factors in the elevated nitrate concentration in groundwater. Based on the model assessment criteria such as receiver operating characteristic (ROC)'s AUC (area under curve), sensitivity, specificity, accuracy, precession, F score, and Kappa coefficient, the Boosting model outperforms others (r = 0.92, AUG ≥ 0.90) in mapping nitrate concentration susceptibility, followed by Bagging and RF models. The results of mapping nitrate concentration also demonstrated that the south-central and western regions had an elevated amount of nitrate content than other regions due to depth variation in the study area. During our sampling campaign, we observed hundreds of fish hatcheries operation, a fish landing center and aquaculture farms which are the reasons for overexploitation and excessive agrochemicals used in the study area. Thus, the dependability of ensemble learning modeling verifies the effectiveness and applicability of the proposed novel approach for decision-makers in groundwater pollution management at the local and regional levels.
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Affiliation(s)
| | - Subodh Chandra Pal
- Department of Geography, The University of Burdwan, Bardhaman 713104, West Bengal, India.
| | - Indrajit Chowdhuri
- Department of Geography, The University of Burdwan, Bardhaman 713104, West Bengal, India
| | - Roquia Salam
- Department of Disaster Management, Begum Rokeya University, Rangpur 5400, Bangladesh
| | - Md Saiful Islam
- Department of Soil Science, Patuakhali Science and Technology University, Dumki, Patuakhali 8602, Bangladesh
| | - Md Mostafizur Rahman
- Department of Environmental Sciences, Jahangirnagar University, Dhaka 1342, Bangladesh
| | - Anwar Zahid
- Bangladesh Water Development Board (BWDB), Dhaka, Bangladesh
| | - Abubakr M Idris
- Department of Chemistry, College of Science, King Khalid University, Abha 61431, Saudi Arabia; Research Center for Advanced Materials Science (RCAMS), King Khalid University, Abha, Saudi Arabia
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15
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Geophysical Delineation of Freshwater–Saline Water Interfaces in Coastal Area of Southwest Bangladesh. WATER 2021. [DOI: 10.3390/w13182527] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Insufficiency of potable water is acute in southwest (SW) coastal areas of Bangladesh. The local population ignores the depth to saltwater/freshwater interface causing many unsuccessful waters wells drilling. In this context, a combined use of borehole logs, geophysical well logs, vertical electrical soundings (VES), electrical resistivity tomography (ERT) and electrical conductivity (EC) of sampled waters was performed to identify saltwater/freshwater interface depths in this coastal part. The study shows that the depth to freshwater/saltwater interface varies from place to place occurring commonly between 190 to 285 m, and locally as shallow as 146 m. The shallow freshwater/saltwater interface depth is greatly influenced by the upconing of fresh water from the deep aquifer (DA) near the major rivers and coast compared to the landward part and is mixed with more saline waters above. Vertically infiltrated saltwater is the main cause of brackish water in the upper shallow aquifer (USA), which is hydraulically connected with the lower shallow aquifer (LSA), and not directly recharged from the Bay of Bengal in the south. The study will contribute to find out the depth of the potential freshwater aquifer and assess the aquifer vulnerability in the coastal area of SW Bangladesh.
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