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Wang, Yinan; Guo, Fei; Chen, Shubao; Zhang, Hong; Zhang, Zhuo; Li, Anbo
Hydrological processes, 20/May , Letnik: 38, Številka: 5Journal Article
Groundwater level (GWL) is a significant indicator for quantifying groundwater availability. Currently, hydrologists worldwide are actively engaged in modelling and predicting GWL. In karst regions, GWL exhibit varying responses to rainfall events across different locations and the impact of rainfall events on GWL within the same location also varies. Despite incorporating rainfall as an input variable, most existing data‐driven GWL prediction models inadequately account for the spatio‐temporal heterogeneity of karst water areas. Therefore, this study proposes a new analysis method to investigate the response patterns of GWL to rainfall events in karst regions with typical spatio‐temporal variations, known as the sensitivity analysis of rainfall‐GWL response. The method introduces the rainfall response coefficient to describe the response characteristics of GWL to rainfall. Through the rainfall response coefficient, the rainfall response variable (RR) is calculated and incorporates it as an input in the RR‐long short‐term memory (LSTM) GWL prediction model. The effectiveness of proposed method was validated by GWL prediction in karst aquifers located in Jinan City, China, renowned for its spatial–temporal heterogeneity in karst development. Through the analysis and validation conducted by integrating geographical multi‐feature, the study revealed a significant improvement in the accuracy of the RR‐LSTM model after integrating RR as a variable, particularly during significant rainfall events. These findings affirm that the method proposed in this study is highly effective in karst regions characterized by anisotropic karst features. We proposed a new method to investigate the response of GWLs to rainfall to greater reveal geographical patterns in karst regions with typical spatio‐temporal variation. This method extracts and corrects rainfall‐GWL response sequences and develops the idea of rainfall response coefficient and rainfall response variable. By integrating the findings into LSTM model, we conducted comparative experiments to evaluate model performance by considering geographical multi‐feature, demonstrating that the new method significantly improved model performance especially during significant rainfall events.
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