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Case Report

Statistical and Numerical Assessments of Groundwater Resource Subject to Excessive Pumping: Case Study in Southwest Taiwan

1
Department of Civil Engineering, National Chung Hsing University, No. 145, Xingda Rd., South Dist., Taichung City 40227, Taiwan
2
Graduate Institute of Hydrological and Oceanic Sciences, National Central University, 300 Zhongda Road, Taoyuan 32001, Taiwan
3
Department of Leisure and Recreation Management, Kainan University, 1 Kainan Road, Taoyuan 33857, Taiwan
*
Author to whom correspondence should be addressed.
Water 2019, 11(2), 360; https://doi.org/10.3390/w11020360
Received: 30 December 2018 / Revised: 15 February 2019 / Accepted: 15 February 2019 / Published: 20 February 2019
(This article belongs to the Special Issue Groundwater Resources Assessment: Quantity and Quality)
Groundwater, a salient water resource in Taiwan, has been subject to incessant and excessive pumping, inducing serious regional land subsidence and seawater intrusion. This study aims at assessing how excessive pumping impacts groundwater variations over the Pingtung Alluvial Plain (PAP) in Southwest Taiwan using both statistical and numerical techniques. We apply nonparametric methods to analyze the changing point and annual trend in various hydro-meteorological time series (e.g., rainfall, temperature, and groundwater levels (GLs)). Afterwards, we employ an integrated surface-subsurface model referred to as WASH123D to simulate GLs under the pumping-free scenario; any discrepancies identified between simulated and observed GLs could be an indicator of unregulated/illegal pumping. We find that annual GLs exhibit a significant increasing (decreasing) trend in the western (eastern) PAP. Our numerical experiment reveals diverging trends in simulated and observed GLs, mostly at the downstream of all the major tributaries, suggesting the consequence of unregulated/illegal pumping. Furthermore, upstream pumping may reduce lateral flow towards the downstream coastal area, triggering land subsidence in remote locations. View Full-Text
Keywords: nonparametric methods; integrated surface-subsurface flow model; WASH123D; water resources management nonparametric methods; integrated surface-subsurface flow model; WASH123D; water resources management
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MDPI and ACS Style

Shih, D.-S.; Chen, C.-J.; Li, M.-H.; Jang, C.-S.; Chang, C.-M.; Liao, Y.-Y. Statistical and Numerical Assessments of Groundwater Resource Subject to Excessive Pumping: Case Study in Southwest Taiwan. Water 2019, 11, 360. https://doi.org/10.3390/w11020360

AMA Style

Shih D-S, Chen C-J, Li M-H, Jang C-S, Chang C-M, Liao Y-Y. Statistical and Numerical Assessments of Groundwater Resource Subject to Excessive Pumping: Case Study in Southwest Taiwan. Water. 2019; 11(2):360. https://doi.org/10.3390/w11020360

Chicago/Turabian Style

Shih, Dong-Sin, Chia-Jeng Chen, Ming-Hsu Li, Cheng-Shin Jang, Che-Min Chang, and Yuan-Ya Liao. 2019. "Statistical and Numerical Assessments of Groundwater Resource Subject to Excessive Pumping: Case Study in Southwest Taiwan" Water 11, no. 2: 360. https://doi.org/10.3390/w11020360

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