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Tian H, Yuan H, Yan K, Guo J. A cosine adaptive particle swarm optimization based long-short term memory method for urban green area prediction. PeerJ Comput Sci 2024; 10:e2048. [PMID: 38855216 PMCID: PMC11157564 DOI: 10.7717/peerj-cs.2048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Accepted: 04/19/2024] [Indexed: 06/11/2024]
Abstract
In the quest for sustainable urban development, precise quantification of urban green space is paramount. This research delineates the implementation of a Cosine Adaptive Particle Swarm Optimization Long Short-Term Memory (CAPSO-LSTM) model, utilizing a comprehensive dataset from Beijing (1998-2021) to train and test the model. The CAPSO-LSTM model, which integrates a cosine adaptive mechanism into particle swarm optimization, advances the optimization of long short-term memory (LSTM) network hyperparameters. Comparative analyses are conducted against conventional LSTM and Partical Swarm Optimization (PSO)-LSTM frameworks, employing mean absolute error (MAE), root mean square error (RMSE), and mean absolute percentage error (MAPE) as evaluative benchmarks. The findings indicate that the CAPSO-LSTM model exhibits a substantial improvement in prediction accuracy over the LSTM model, manifesting as a 66.33% decrease in MAE, a 73.78% decrease in RMSE, and a 57.14% decrease in MAPE. Similarly, when compared to the PSO-LSTM model, the CAPSO-LSTM model demonstrates a 58.36% decrease in MAE, a 65.39% decrease in RMSE, and a 50% decrease in MAPE. These results underscore the efficacy of the CAPSO-LSTM model in enhancing urban green space area prediction, suggesting its significant potential for aiding urban planning and environmental policy formulation.
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Affiliation(s)
- Hao Tian
- Hubei Key Laboratory of Digital Finance Innovation (Hubei University of Economics), Wuhan, China
- School of Information Engineering, Hubei University of Economics, Wuhan, Hubei, China
| | - Hao Yuan
- School of Information Engineering, Hubei University of Economics, Wuhan, Hubei, China
| | - Ke Yan
- China Construction Third Engineering Bureau Installation Engineering Co., Ltd., Wuhan, Hubei, China
| | - Jia Guo
- Hubei Key Laboratory of Digital Finance Innovation (Hubei University of Economics), Wuhan, China
- School of Information Engineering, Hubei University of Economics, Wuhan, Hubei, China
- Hubei Internet Finance Information Engineering Technology Research Center, Hubei University of Economics, Wuhan, China
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Ding L, Li C, Lei Z, Zhang C, Wei L, Guo Z, Li Y, Fan X, Qi D, Wang J. Spatiotemporal evolution of deformation and LSTM prediction model over the slope of the deep excavation section at the head of the South-North Water Transfer Middle Route Canal. Heliyon 2024; 10:e26301. [PMID: 38390192 PMCID: PMC10881434 DOI: 10.1016/j.heliyon.2024.e26301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2023] [Revised: 11/27/2023] [Accepted: 02/09/2024] [Indexed: 02/24/2024] Open
Abstract
Slope deformation is one of the focal issues of concern during the normal operation and maintenance of the South-North Water Transfer Middle Route Project. To study the slope deformation evolution in the deep excavation section at the head of the canal, we applied 88 views of Sentinel-1A ascending image data from 2017 to 2019 and MT-InSAR(Multi-temporal InSAR) deformation monitoring technology to obtain long-time series deformation rates and cumulative deformation fields over the slope in the study area. Based on the analysis of the time-series monitoring data of the deformation field sample points, a LSTM (Long Short Term Memory Network) slope deformation predictive model was constructed to predict the slope deformation for the next 12 months at 12 sample points of the deep excavation slope. The impact of rainfall on slope deformation was investigated, and the reliability of the LSTM model was verified by using the measured data. The results show that the average annual deformation rate of the slope ranges from 10mm/a to 25mm/a, the maximum cumulative deformation is about 60 mm, and the slope of the excavated section is generally in an uplifted state. The rainfall-induced repeated uplift or subsidence of the canal slopes together with the peak deformation was closely related to the amount of rainfall during the wet season, and the longer the duration of the wet season, the more obvious the crest. Among the12 sample sites, the minimum and maximum deformation predicted using the LSTM model were 51.7 mm and 73.9 mm respectively, with the lowest correlation coefficient of 0.994 and the highest of 0.999. The maximum and minimum values of RMSE (Root Mean Square Error) were 4.4 mm and 3.6 mm respectively, indicating reliable prediction results. The results of the study can provide reference for the prevention and control of geological hazards in the South-North Water Transfer Canal.
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Affiliation(s)
- Laizhong Ding
- School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo, 454000, China
- Institute of Surveying Mapping and Geoinformation, Zhengzhou, 450007, China
| | - Chunyi Li
- School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo, 454000, China
| | - Zhen Lei
- Institute of Surveying Mapping and Geoinformation, Zhengzhou, 450007, China
| | - Changjie Zhang
- Institute of Surveying Mapping and Geoinformation, Zhengzhou, 450007, China
| | - Lei Wei
- Institute of Surveying Mapping and Geoinformation, Zhengzhou, 450007, China
| | - Zengzhang Guo
- School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo, 454000, China
| | - Ying Li
- Institute of Surveying Mapping and Geoinformation, Zhengzhou, 450007, China
| | - Xin Fan
- Institute of Surveying Mapping and Geoinformation, Zhengzhou, 450007, China
| | - Daokun Qi
- State Grid Henan Economic Research Institute, Zhengzhou, 450007, China
| | - Junjian Wang
- Institute of Surveying Mapping and Geoinformation, Zhengzhou, 450007, China
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Xia X, Liu B, Tian R, He Z, Han S, Pan K, Yang J, Zhang Y. An interval water demand prediction method to reduce uncertainty: A case study of Sichuan Province, China. ENVIRONMENTAL RESEARCH 2023; 238:117143. [PMID: 37716380 DOI: 10.1016/j.envres.2023.117143] [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: 06/17/2023] [Revised: 08/17/2023] [Accepted: 09/13/2023] [Indexed: 09/18/2023]
Abstract
Effective prediction of water demand is a prerequisite for decision makers to achieve reliable management of water supply. Currently, the research on water demand prediction focuses on point prediction method. In this study, we constructed a GA-BP-KDE hybrid interval water demand prediction model by combining non-parametric estimation and point prediction. Multiple metaheuristic algorithms were used to optimize the Back-Propagation Neural Network (BP) and Kernel Extreme Learning Machine (KELM) network structures. The performance of the water demand point prediction models was compared by the Root Mean Squared Error (RMSE), Mean Absolute Percentage Error (MAPE), Kling-Gupta Efficiency (KGE), computation time, and fitness convergence curves. The kernel density estimation method (KDE) and the normal distribution method were used to fit the distribution of errors. The probability density function with the best fitting degree was selected based on the index G. The shortest confidence interval under 95% confidence was calculated according to the asymmetry of the error distribution. We predicted the impact indicator values for 2025 using the exponential smoothing method, and obtained water demand prediction intervals for various water use sectors. The results showed that the GA-BP model was the optimal model as it exhibited the highest computational efficiency, algorithmic stability, and prediction accuracy. The three prediction intervals estimated after adjusting the KDE bandwidth parameter covered most of the sample points in the test set. The prediction intervals of the four water use sectors were evaluated as F values of 1.6845, 1.3294, 1.6237, and 1.3600, which indicates high accuracy and quality of the prediction intervals. The mixed water demand interval prediction based on GA-BP-KDE reduces the uncertainty of the point prediction results and can provide a basis for water resource management by decision makers.
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Affiliation(s)
- Xinyu Xia
- College of Mathematics and Physics, Chengdu University of Technology, Chengdu, 610059, China
| | - Bin Liu
- College of Mathematics and Physics, Chengdu University of Technology, Chengdu, 610059, China.
| | - Rui Tian
- Sichuan Water Resources Dispatching Management Center, Chengdu, 610031, China
| | - Zuli He
- College of Mathematics and Physics, Chengdu University of Technology, Chengdu, 610059, China
| | - Suyue Han
- College of Management Science, Chengdu University of Technology, Chengdu, 610059, China
| | - Ke Pan
- College of Mathematics and Physics, Chengdu University of Technology, Chengdu, 610059, China
| | - Jingjing Yang
- College of Mathematics and Physics, Chengdu University of Technology, Chengdu, 610059, China
| | - Yiting Zhang
- College of Mathematics and Physics, Chengdu University of Technology, Chengdu, 610059, China
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Du B, Zha D, Guo J, Yu X. Optimization of pump scheduling in waterworks considering load balancing using improved genetic algorithm. JOURNAL OF INTELLIGENT & FUZZY SYSTEMS 2023. [DOI: 10.3233/jifs-224245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
Abstract
The water transmission and distribution process of the water supply pump station of the water purification plant plays a key role in the entire urban water supply system. When the requirements of water supply quantity and water pressure are satisfied, the reduction of operating energy consumption of the pump set and improvement of its service life are urgent problems. Therefore, to reduce the cost of water supply pump station, a mathematical model is established to minimize the energy consumption of pump group, the number of pump switches and the load balancing in this paper. In order to solve the pump scheduling problem, a two-stage strategy based on genetic algorithm is proposed. In stage one, the frequency conversion ratio and the number of pumps needed to be turned on at the lowest energy consumption are calculated. In stage two, through the improved genetic algorithm and iterative way to reduce the number of pump switches and load balancing. Finally, a case study from a real waterworks in Suzhou, China is used to verify the validity of the proposed model. Numerical results reveal that the improved genetic algorithm outperforms the competing algorithms. In addition, a proper sensitivity analysis allows assessing the effects under different pump operating conditions.
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