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Seasonal Variation of Catenary-Bead Dunes in the Yangtze River Estuary: Causes and Implications. JOURNAL OF MARINE SCIENCE AND ENGINEERING 2022. [DOI: 10.3390/jmse10070886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Low-angle lee-side slopes of dunes are commonly developed on the world’s riverbeds, and dune migration associated with sediment transport exert a major influence on riverine processes. However, the catenary-bead dune has been identified in the Yangtze River (YR) Estuary, featuring a higher lee-side angle. To date, the morphological variation and formation reasons of catenary-bead dunes in the YR Estuary remain uncharacterized. In this study, we used a multibeam echo system (MBES) to investigate the bedforms of the YR estuary during 2014–2015, as well as to discuss the seasonal variation of catenary-bead dunes. The results indicate that the catenary-bead dunes of the YR Estuary are characterized by growth during the flood season and extinction during the dry season. The lee-side angle is typically ~16.7°, which is larger than that of other dune types (3.7–8°) in the estuary; moreover, the catenary-bead dunes are higher than other dune types of the same length in the YR Estuary. The relationship between the dune height (H) and length (L) was found to be H = 0.1667L0.603 (R2 = 0.38), while the other dune types yielded the relationship of H = 0.0845L0.758 (R2 = 0.52). Strong runoff superimposing the ebb tide led to the development of catenary-bead dunes. Furthermore, the higher coarse sediment content (69.9–72%) and lower clay content (6.3–6.7%) of the riverbed sediment are favorable for their formation, while the higher curved crest-lines are favorable for the formation of the associated elliptical pits.
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Ma H, Nittrouer JA, Fu X, Parker G, Zhang Y, Wang Y, Wang Y, Lamb MP, Cisneros J, Best J, Parsons DR, Wu B. Amplification of downstream flood stage due to damming of fine-grained rivers. Nat Commun 2022; 13:3054. [PMID: 35650197 PMCID: PMC9160006 DOI: 10.1038/s41467-022-30730-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Accepted: 05/16/2022] [Indexed: 11/29/2022] Open
Abstract
River dams provide many benefits, including flood control. However, due to constantly evolving channel morphology, downstream conveyance of floodwaters following dam closure is difficult to predict. Here, we test the hypothesis that the incised, enlarged channel downstream of dams provides enhanced water conveyance, using a case study from the lower Yellow River, China. We find that, although flood stage is lowered for small floods, counterintuitively, flood stage downstream of a dam can be amplified for moderate and large floods. This arises because bed incision is accompanied by sediment coarsening, which facilitates development of large dunes that increase flow resistance and reduce velocity relative to pre-dam conditions. Our findings indicate the underlying mechanism for such flood amplification may occur in >80% of fine-grained rivers, and suggest the need to reconsider flood control strategies in such rivers worldwide. Dams constructed on fine-grained rivers cause an increase in flow resistance downstream, thereby amplifying, rather than reducing, flood stage.
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Affiliation(s)
- Hongbo Ma
- Department of Civil and Environmental Engineering, University of California at Irvine, Irvine, CA, USA.
| | | | - Xudong Fu
- State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, China.
| | - Gary Parker
- Department of Geology, University of Illinois, Urbana-Champaign, IL, USA.,Department of Civil and Environmental Engineering, Ven Te Chow Hydrosystems Laboratory, University of Illinois, Urbana-Champaign, IL, USA
| | - Yuanfeng Zhang
- Yellow River Institute of Hydraulic Research, Zhengzhou, Henan, China
| | - Yuanjian Wang
- Yellow River Institute of Hydraulic Research, Zhengzhou, Henan, China
| | - Yanjun Wang
- State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, China
| | - Michael P Lamb
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
| | - Julia Cisneros
- Department of Geology, University of Illinois, Urbana-Champaign, IL, USA
| | - Jim Best
- Department of Geology, University of Illinois, Urbana-Champaign, IL, USA.,Department of Civil and Environmental Engineering, Ven Te Chow Hydrosystems Laboratory, University of Illinois, Urbana-Champaign, IL, USA.,Department of Geography and Geographic Information Science, University of Illinois, Urbana-Champaign, IL, USA.,Department of Mechanical Science and Engineering, University of Illinois, Urbana-Champaign, IL, USA
| | | | - Baosheng Wu
- State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, China
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An Approach for the Automatic Characterization of Underwater Dunes in Fluviomarine Context. GEOSCIENCES 2022. [DOI: 10.3390/geosciences12020089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The identification of underwater landforms represents an important role in the study of the seafloor morphology. In this context, the segmentation and characterization of underwater dunes allow a better understanding of the dynamism of the seafloor, since the formation of these structures is directly related to environmental conditions, such as current, tide, grain size, etc. In addition, it helps to ensure safe navigation, especially in the context of navigation channels requiring periodic maintenance. This paper proposes a novel method to automatically characterize the underwater dunes. Its originality relies on the extraction of morphological descriptors not only related to the dune itself, but also to the fields where the dunes are located. Furthermore, the proposed approach involves the entire surface of the dunes, rather than profiles or group of pixels as generally found in previous works. Considering the surface modelled by a digital bathymetric model (DBM), the salient features of the dunes (i.e., crest line, stoss trough, and lee trough) are first identified using a geomorphometric analysis of the DBM. The individual dunes are built by matching the crest lines with their respective troughs according to an object-oriented approach. Then, a series of morphological descriptors, selected through a literature review, are computed by taking advantage of the dune salient features, surface representation, and spatial distribution in the fields where they are located. The validation of the proposed method has been conducted using more than 1200 dunes in the fluvio-marine context of the Northern Traverse of the Saint Lawrence River.
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Surface Characterisation of Kolk-Boils within Tidal Stream Environments Using UAV Imagery. JOURNAL OF MARINE SCIENCE AND ENGINEERING 2021. [DOI: 10.3390/jmse9050484] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
High-flow tidal stream environments, targeted for tidal turbine installations, exhibit turbulent features, at fine spatio-temporal scales (metres and seconds), created by site-specific topography and bathymetry. Bed-derived turbulent features (kolk-boils) are thought to have detrimental effects on tidal turbines. Characterisation of kolk-boils is therefore essential to inform turbine reliability, control, and maintenance strategies. It will also improve the understanding of potential ecological interactions with turbines, as marine animals use these sites for foraging. Unmanned aerial vehicle (UAV), or drone, imagery offers a novel approach to take precise measurements of kolk-boil characteristics (distribution, presence, and area) at the surface. This study carried out sixty-three UAV surveys within the Inner Sound of the Pentland Firth, Scotland, UK, over four-day periods in 2016 and 2018. Kolk-boil characteristics were examined against relevant environmental covariates to investigate potential drivers of presence and area. The results show that distribution at the surface could be predicted based on tidal phase, with current velocity significantly influencing presence above 3.0 m/s. The technique can be used to inform turbine development, micro-siting and provide better understanding of environmental implications of turbine operation. Finally, it highlights the suitability of UAVs for capturing rapid fine-scale hydrodynamic data in the absence of in situ measurements.
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Feedback Mechanism in Bifurcating River Systems: the Effect on Water-Level Sensitivity. WATER 2020. [DOI: 10.3390/w12071915] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Accurate and reliable estimates of water levels are essential to assess flood risk in river systems. In current practice, uncertainties involved and the sensitivity of water levels to these uncertainties are studied in single-branch rivers, while many rivers in deltas consist of multiple distributaries. In a bifurcating river, a feedback mechanism exists between the downstream water levels and the discharge distribution at the bifurcation. This paper aims to quantify the sensitivity of water levels to main channel roughness in a bifurcating river system. Water levels are modelled for various roughness scenarios under a wide range of discharge conditions using a one-dimensional hydraulic model. The results show that the feedback mechanism reduces the sensitivity of water levels to local changes of roughness in comparison to the single-branch river. However, in the smaller branches of the system, water-level variations induced by the changes in discharge distribution can exceed the water-level variations of the single-branch river. Therefore, water levels throughout the entire system are dominated by the conditions in the largest branch. As the feedback mechanism is important, the river system should be considered as one interconnected system in river maintenance of rivers, flood-risk analyses, and future planning of river engineering works.
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Bedform Morphology in the Area of the Confluence of the Negro and Solimões-Amazon Rivers, Brazil. WATER 2020. [DOI: 10.3390/w12061630] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Confluences are common components of all riverine systems, characterized by converging flow streamlines and the mixing of separate flows. The fluid dynamics of confluences possesses a highly complex structure with several common types of flow features observed. A field study was recently conducted in the area of the confluence of the Negro and Solimões/Amazon Rivers, Brazil, collecting a series of Acoustic Doppler Current Profiler (ADCP) transects in different flow conditions. These data were used to investigate the morphology of the bedforms observed in that area. First, the bedforms were mostly classified as large and very large dunes according to Ashley et al. (1990), with an observed maximum wavelength and wave height of 350 and 12 m, respectively. Second, a comparison between low flow and relatively high flow conditions showed that wavelength and wave height increased as the river discharge increased in agreement with previous literature studies. Third, the lee side angle was consistently below 10°, with an average value of about 3.0°, without flow separation confirming past findings on low-angle dunes. Finally, a comparison between the bedform sizes and past literature studies on large rivers suggested that while several dunes were in equilibrium with the flow, several largest bedforms were found to be probably adapting to discharge changes in the river.
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Talke SA, Jay DA. Changing Tides: The Role of Natural and Anthropogenic Factors. ANNUAL REVIEW OF MARINE SCIENCE 2020; 12:121-151. [PMID: 31479622 DOI: 10.1146/annurev-marine-010419-010727] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Tides are changing worldwide at rates not explained by astronomical forcing. Rather, the observed evolution of tides and other long waves, such as storm surges, is influenced by shelf processes and changes to the roughness, depth, width, and length of embayments, estuaries, and tidal rivers. In this review, we focus on processes in estuaries and tidal rivers, because that is where the largest changes to tidal properties are occurring. Recent literature shows that changes in tidal amplitude have been ubiquitous worldwide over the past century, often in response to wetland reclamation, channel dredging, and other environmental changes. While tidal amplitude changes are sometimes slight (<1%) or even negative, we identify two types of systems that are particularly prone to tidal amplification: (a) shallow, strongly damped systems, in which a small increase in depth produces a large decrease in effective friction, and (b) systems in which wave reflection and resonance are strongly influenced by changes to depth, friction, and convergence. The largest changes in amplitude occur inland, some distance from the coast, and can sometimes be measured in meters. Tide changes are a leading indicator that the dynamics of storm surges and river flood waves have also changed and are often associated with shifts in sediment transport, salinity intrusion, and ecosystem properties. Therefore, the dynamics of tidal evolution have major implications for coastal management, particularly for systems that are sensitive to changes in geometry induced by sea-level rise and anthropogenic development.
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Affiliation(s)
- Stefan A Talke
- Department of Civil and Environmental Engineering, California Polytechnic State University, San Luis Obispo, California 94307, USA;
| | - David A Jay
- Department of Civil and Environmental Engineering, Portland State University, Portland, Oregon 97207, USA
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Best J, Fielding CR. Describing fluvial systems: linking processes to deposits and stratigraphy. ACTA ACUST UNITED AC 2019. [DOI: 10.1144/sp488-2019-056] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
AbstractThe period since the 1960s witnessed significant progress in our ability to decipher the clastic rock record from a wide range of sedimentary environments, and spanning many spatio-temporal scales, from millimetric to that of the sedimentary basin, and involving processes acting on timescales of seconds to millions of years. This review assesses advances in four areas of fluvial sedimentology: the nature of alluvial dunes, the role of fine-grained suspended sediment, the linking of facies models and channel planform, and the reconstruction of drainage networks within ancient sedimentary successions. The synthesis reveals that we require new thinking and research to: (1) address the range of stratification produced by dunes and their palaeohydraulic implications; (2) evolve new bedform phase diagrams capable of incorporating the reality that many fluids transport fine-grained sediment, both in flow and within the bed, which may significantly modify the bedform morphology and phase space when compared with existing bedform stability diagrams; (3) develop new alluvial facies models in which planform channel pattern is not the fundamental discriminant; and (4) re-establish consideration of process mechanics as the heart of developing ideas and debates concerning fluvial deposit preservation and alluvial architecture.
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Affiliation(s)
- Jim Best
- Departments of Geology, Geography and GIS, Mechanical Science and Engineering, and Ven Te Chow Hydrosystems Laboratory, University of Illinois at Urbana—Champaign, Urbana, IL 61801, USA
| | - Christopher R. Fielding
- Department of Earth and Atmospheric Sciences, University of Nebraska—Lincoln, 126 Bessey Hall, Lincoln, NE 68588, USA
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Multibeam Bathymetric Investigations of the Morphology and Associated Bedforms, Sulina Channel, Danube Delta. GEOSCIENCES 2018. [DOI: 10.3390/geosciences8010007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In the Danube Delta, on the Sulina branch, the morphology, sediment, and bedform characteristics were investigated. Three-dimensional (3D) bathymetry, flow velocity, suspended-load concentration, and liquid and solid discharge data were acquired throughout several cross sections along the Sulina channel, in order to investigate the distribution of water and sediment discharges and their influence against the river bed. A single observation (in February 2007) was made regarding the geometry, sediment composition, and hydraulic conditions under which the dunes grew and degenerated. The investigation focuses here mostly on the geometrical parameters of these bedforms, such as height, length, as well as grain size characteristic of the sediment and water dynamics. Based on in-site measurements, different hydraulic parameters were calculated, such as bed shear stresses and Reynolds number. During the field campaign, the measured water mean velocity was from v = 0.22–1.13 m∙s−1. At the same time, the measured range of shear stresses within the dune field formation was from τ0 = 2.86 N·m−2 (on the cutoffs) to 8.62 N·m−2 (on the main channel). It was found that the correlation between height (H) and length (L) of the Sulina branch dunes describes the formula: H = 0.093L0.5268. The bedforms of the Sulina channel are, in general, developed in fine sand (D50 between 0.06 and 0.35 mm).
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Caruso A, Vesipa R, Camporeale C, Ridolfi L, Schmid PJ. River bedform inception by flow unsteadiness: A modal and nonmodal analysis. Phys Rev E 2016; 93:053110. [PMID: 27300981 DOI: 10.1103/physreve.93.053110] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Indexed: 11/07/2022]
Abstract
River bedforms arise as a result of morphological instabilities of the stream-sediment interface. Dunes and antidunes constitute the most typical patterns, and their occurrence and dynamics are relevant for a number of engineering and environmental applications. Although flow variability is a typical feature of all rivers, the bedform-triggering morphological instabilities have generally been studied under the assumption of a constant flow rate. In order to partially address this shortcoming, we here discuss the influence of (periodic) flow unsteadiness on bedform inception. To this end, our recent one-dimensional validated model coupling Dressler's equations with a refined mechanistic sediment transport formulation is adopted, and both the asymptotic and transient dynamics are investigated by modal and nonmodal analyses.
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Affiliation(s)
- Alice Caruso
- Department of Environmental, Land and Infrastructure Engineering, Politecnico di Torino, Corso Duca Abruzzi 24, 10129 Turin, Italy
| | - Riccardo Vesipa
- Department of Environmental, Land and Infrastructure Engineering, Politecnico di Torino, Corso Duca Abruzzi 24, 10129 Turin, Italy
| | - Carlo Camporeale
- Department of Environmental, Land and Infrastructure Engineering, Politecnico di Torino, Corso Duca Abruzzi 24, 10129 Turin, Italy
| | - Luca Ridolfi
- Department of Environmental, Land and Infrastructure Engineering, Politecnico di Torino, Corso Duca Abruzzi 24, 10129 Turin, Italy
| | - Peter J Schmid
- Department of Mathematics, Imperial College London, London SW7 2AZ, United Kingdom
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Franca MJ, Brocchini M. Turbulence in Rivers. RIVERS – PHYSICAL, FLUVIAL AND ENVIRONMENTAL PROCESSES 2015. [DOI: 10.1007/978-3-319-17719-9_2] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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Iwasaki T, Nabi M, Shimizu Y, Kimura I. Computational modeling of 137Cs contaminant transfer associated with sediment transport in Abukuma River. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2015; 139:416-426. [PMID: 24909793 DOI: 10.1016/j.jenvrad.2014.05.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Revised: 05/08/2014] [Accepted: 05/18/2014] [Indexed: 06/03/2023]
Abstract
A numerical model capable of simulating the transfer of (137)Cs in rivers associated with transport of fine sediment is presented. The accident at Fukushima Dai-ichi Nuclear Power Plant (FDNPP) released radionuclides into the atmosphere, and after fallout several radionuclides in them, such as radiocesium ((134)Cs, (137)Cs) and radioiodine ((131)I) were adsorbed on surface soil particles around FDNPP and transported by surface water. To understand the transport and deposition of the radioactive contaminant along with surface soil particles and its flux to the ocean, we modeled the transport of the (137)Cs contaminant by computing the water flow and the associated washload and suspended load transport. We have developed a two-dimensional model to simulate the plane flow structure, sediment transport and associated (137)Cs contaminant transport in rivers by combining a shallow water flow model and an advection-diffusion equation for the transport of sediment. The proposed model has been applied to the lower reach of Abukuma River, which is the main river in the highly contaminated area around FDNPP. The numerical results indicate that most (137)Cs supplied from the upstream river reach with washload would directly reach to Pacific Ocean. In contrast, washload-oriented (137)Cs supplied from the upstream river basin has a limited role in the radioactive contamination in the river. The results also suggest that the proposed framework of computational model can be a potential tool for understanding the sediment-oriented (137)Cs behavior in rivers.
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Affiliation(s)
- T Iwasaki
- Laboratory of Hydraulic Research, Graduate School of Engineering, Hokkaido University, N13, W8, Kita-ku, Sapporo 060-8628, Japan.
| | - M Nabi
- Laboratory of Hydraulic Research, Graduate School of Engineering, Hokkaido University, N13, W8, Kita-ku, Sapporo 060-8628, Japan.
| | - Y Shimizu
- Laboratory of Hydraulic Research, Graduate School of Engineering, Hokkaido University, N13, W8, Kita-ku, Sapporo 060-8628, Japan.
| | - I Kimura
- Laboratory of Hydraulic Research, Graduate School of Engineering, Hokkaido University, N13, W8, Kita-ku, Sapporo 060-8628, Japan.
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Anderson W, Chamecki M. Numerical study of turbulent flow over complex aeolian dune fields: the White Sands National Monument. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2014; 89:013005. [PMID: 24580318 DOI: 10.1103/physreve.89.013005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Indexed: 06/03/2023]
Abstract
The structure and dynamics of fully developed turbulent flows responding to aeolian dune fields are studied using large-eddy simulation with an immersed boundary method. An aspect of particular importance in these flows is the downwind migration of coherent motions associated with Kelvin-Helmholtz instabilities that originate at the dune crests. These instabilities are responsible for enhanced downward transport of high-momentum fluid via the so-called turbulent sweep mechanism. However, the presence of such structures and their role in determining the bulk characteristics of fully developed dune field sublayer aerodynamics have received relatively limited attention. Moreover, many existing studies address mostly symmetric or mildly asymmetric dune forms. The White Sands National Monument is a field of aeolian gypsum sand dunes located in the Tularosa Basin in southern New Mexico. Aeolian processes at the site result in a complex, anisotropic dune field. In the dune field sublayer, the flow statistics resemble a mixing layer: At approximately the dune crest height, vertical profiles of streamwise velocity exhibit an inflection and turbulent Reynolds stresses are maximum; below this, the streamwise and vertical velocity fluctuations are positively and negatively skewed, respectively. We evaluate the spatial structure of Kelvin-Helmholtz instabilities present in the dune field sublayer (shear length L(s) and vortex spacing Λ(x)) and show that Λ(x)=m(dune)L(s), where m(dune)≈7.2 in the different sections considered (for turbulent mixing layers, 7<m<10 [M. M. Rogers and R. D. Moser, Phys. Fluids A 6, 903 (1994)]).
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Affiliation(s)
- William Anderson
- Mechanical Engineering Department and Center for Astrophysics, Space Physics and Engineering Research, Baylor University, Waco, Texas 76798, USA
| | - Marcelo Chamecki
- Department of Meteorology, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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Seamless Mapping of River Channels at High Resolution Using Mobile LiDAR and UAV-Photography. REMOTE SENSING 2013. [DOI: 10.3390/rs5126382] [Citation(s) in RCA: 127] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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17
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Singh A, Foufoula-Georgiou E, Porté-Agel F, Wilcock PR. Coupled dynamics of the co-evolution of gravel bed topography, flow turbulence and sediment transport in an experimental channel. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2011jf002323] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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Mariotti G, Fagherazzi S. Channels-tidal flat sediment exchange: The channel spillover mechanism. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2011jc007378] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Hardy RJ, Best JL, Lane SN, Carbonneau PE. Coherent flow structures in a depth-limited flow over a gravel surface: The influence of surface roughness. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2009jf001416] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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20
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Ancey C. Stochastic modeling in sediment dynamics: Exner equation for planar bed incipient bed load transport conditions. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2009jf001260] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Christophe Ancey
- School of Architecture, Civil and Environmental Engineering; École Polytechnique Fédérale de Lausanne; Lausanne Switzerland
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21
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Grigoriadis DGE, Balaras E, Dimas AA. Large-eddy simulations of unidirectional water flow over dunes. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008jf001014] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Paarlberg AJ, Dohmen-Janssen CM, Hulscher SJMH, Termes P. Modeling river dune evolution using a parameterization of flow separation. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2007jf000910] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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23
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Hardy RJ, Best JL, Lane SN, Carbonneau PE. Coherent flow structures in a depth-limited flow over a gravel surface: The role of near-bed turbulence and influence of Reynolds number. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2007jf000970] [Citation(s) in RCA: 100] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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24
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Zoueshtiagh F, Thomas PJ, Thomy V, Merlen A. Micrometric granular ripple patterns in a capillary tube. PHYSICAL REVIEW LETTERS 2008; 100:054501. [PMID: 18352374 DOI: 10.1103/physrevlett.100.054501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2007] [Indexed: 05/26/2023]
Abstract
The oscillatory motion of a fluid carrying micron-sized particles inside a capillary tube is investigated experimentally. It is found that initially uniformly distributed particles can segregate and accumulate to form regularly spaced micron-sized particle clusters. The wavelength of the microclusters is compared to data for macroscale sand-ripple patterns and found to obey the same universal scaling as these. A dimensional analysis is performed that confirms the universality of the experimentally observed scaling. The experimental data for the microripple clusters further suggest the existence of a minimum particle length scale for which patterns can form and below which the Brownian motion associated with the molecules of the matrix fluid inhibits pattern formation.
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Affiliation(s)
- F Zoueshtiagh
- Laboratoire de Mécanique de Lille UMR CNRS 8107, Bd Paul Langevin, 59655 Villeneuve d'Ascq, France
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Wren DG, Kuhnle RA, Wilson CG. Measurements of the relationship between turbulence and sediment in suspension over mobile sand dunes in a laboratory flume. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006jf000683] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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26
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Parsons DR, Best JL, Orfeo O, Hardy RJ, Kostaschuk R, Lane SN. Morphology and flow fields of three-dimensional dunes, Rio Paraná, Argentina: Results from simultaneous multibeam echo sounding and acoustic Doppler current profiling. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2004jf000231] [Citation(s) in RCA: 171] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- D. R. Parsons
- Earth and Biosphere Institute, School of Earth and Environment; University of Leeds; Leeds UK
| | - J. L. Best
- Earth and Biosphere Institute, School of Earth and Environment; University of Leeds; Leeds UK
| | - O. Orfeo
- Centro de Ecologica Applicada del Littoral; Corrientes Argentina
| | - R. J. Hardy
- Department of Geography; University of Durham; Durham UK
| | - R. Kostaschuk
- Department of Geography; University of Guelph; Guelph, Ontario Canada
| | - S. N. Lane
- Department of Geography; University of Durham; Durham UK
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Hulscher SJMH, Dohmen-Janssen CM. Introduction to special section on Marine Sand Wave and River Dune Dynamics. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2005jf000404] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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