Construction of a spatio-temporal coupling model for groundwater level prediction: a case study of Changwu area, Yangtze River Delta region of China
| Autor: | Junyi Chen, Junru Zhang, Hui Qi, Chen Suozhong, He Liang, Manqing Hou |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Hydrology
Delta TC401-506 010504 meteorology & atmospheric sciences changwu area spatio-temporal prediction model Water supply for domestic and industrial purposes Temporal coupling groundwater level 0207 environmental engineering 02 engineering and technology 01 natural sciences River lake and water-supply engineering (General) Yangtze river Environmental science long short-term memory network 020701 environmental engineering China wavelet transform TD201-500 Groundwater 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Water Supply, Vol 21, Iss 7, Pp 3790-3809 (2021) |
| ISSN: | 1607-0798 1606-9749 |
| Popis: | Dynamic monitoring data of groundwater level is an important basis for understanding the current situation of groundwater development and for the utilization and planning of sustainable exploitation. Dynamic monitoring data of groundwater level are typical spatio-temporal sequence data, which have the characteristics of non-linearity and strong spatio-temporal correlation. The trend of dynamic change of groundwater level is the key factor for the optimal allocation of groundwater resources. However, most of the existing groundwater level prediction models are insufficient in considering temporal and spatial factors and their spatio-temporal correlation. Therefore, construction of a space–time prediction model of groundwater level considering space–time factors and improving the prediction accuracy of groundwater level dynamic changes is of considerable theoretical and practical importance for the sustainable development of groundwater resources utilization. Based on the analysis of spatial–temporal characteristics of groundwater level of the pore confined aquifer II of Changwu area in the Yangtze River Delta region of China, the wavelet transform method was used to remove the noise in the original data, and the K-nearest neighbor (KNN) method was used to calculate the water level. The spatial–temporal dataset and the long short-term memory (LSTM) were reconstructed by screening the spatial correlation of the monitoring wells in the study area. A spatio-temporal KNN-LSTM prediction model for groundwater level considering spatio-temporal factors was also constructed. The reliability and accuracy of KNN-LSTM, LSTM, support vector regression (SVR), and autoregressive integrated moving average (ARIMA) model were evaluated by a cross-validation algorithm. Results showed that the prediction accuracy of KNN-LSTM is 20.68%, 46.54%, and 55.34% higher than that of the other single prediction models (LSTM, SVR, and ARIMA, respectively). HIGHLIGHTS A KNN-LSTM spatio-temporal prediction model for groundwater level is proposed.; It is vital to use wavelet transform to denoise the original data before prediction.; KNN-LSTM has better applicability and accuracy than traditional single random models. |
| Databáze: | OpenAIRE |
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