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Open AccessArticle

Modeling and Investigating the Mechanisms of Groundwater Level Variation in the Jhuoshui River Basin of Central Taiwan

1
State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an 710048, China
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Department of Civil and Environmental Engineering, Pennsylvania State University, University Park, PA 16802, USA
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Institute of Hydrology and water resources, Zhejiang University, Hangzhou 310058, China
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Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei 10617, Taiwan
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Department of Water Resources and Environmental Engineering, Tamkang University, New Taipei City 25137, Taiwan
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Water Resources Agency, Ministry of Economic Affairs, Taipei 10651, Taiwan
*
Author to whom correspondence should be addressed.
Water 2019, 11(8), 1554; https://doi.org/10.3390/w11081554
Received: 11 May 2019 / Revised: 18 July 2019 / Accepted: 24 July 2019 / Published: 27 July 2019
(This article belongs to the Section Hydrology)
Due to nonuniform rainfall distribution in Taiwan, groundwater is an important water source in certain areas that lack water storage facilities during periods of drought. Therefore, groundwater recharge is an important issue for sustainable water resources management. The mountainous areas and the alluvial fan areas of the Jhuoshui River basin in Central Taiwan are considered abundant groundwater recharge regions. This study aims to investigate the interactive mechanisms between surface water and groundwater through statistical techniques and estimate groundwater level variations by a combination of artificial intelligence techniques and the Gamma test (GT). The Jhuoshui River basin in Central Taiwan is selected as the study area. The results demonstrate that: (1) More days of accumulated rainfall data are required to affect variable groundwater levels in low-permeability wells or deep wells; (2) effective rainfall thresholds can be properly identified by lower bound screening of accumulated rainfall; (3) daily groundwater level variation can be estimated effectively by artificial neural networks (ANNs); and (4) it is difficult to build efficient models for low-permeability wells, and the accuracy and stability of models is worse in the proximal-fan areas than in the mountainous areas. View Full-Text
Keywords: groundwater level; recharge groundwater; Gamma test (GT); accumulated rainfall; artificial neural networks (ANNs) groundwater level; recharge groundwater; Gamma test (GT); accumulated rainfall; artificial neural networks (ANNs)
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Bai, T.; Tsai, W.-P.; Chiang, Y.-M.; Chang, F.-J.; Chang, W.-Y.; Chang, L.-C.; Chang, K.-C. Modeling and Investigating the Mechanisms of Groundwater Level Variation in the Jhuoshui River Basin of Central Taiwan. Water 2019, 11, 1554.

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