Using the resistivity imaging method to monitor the dynamic effects on the vadose zone during pumping tests at the pengtsuo site in pingtung, Taiwan

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Title:	Using the resistivity imaging method to monitor the dynamic effects on the vadose zone during pumping tests at the pengtsuo site in pingtung, Taiwan
Authors:	張竝瑜;Chang, Ping-Yu;Hsu, Shao-Yiu;Chang, Liang-Cheng;Chen, Wen-Fu;Chen, Yu-Wen;Lu, Hsueh-Yu
Contributors:	地球科學學院地球科學學系
Keywords:	Boundary conditions;Dewatering;Dynamic non-equilibrium effect;Electrical resistivity;Gauges;Groundwater;Groundwater flow;Groundwater levels;Imaging techniques;Monitoring methods;Phase transitions;Pumping;Pumping tests;Surveying;Time-lapse resistivity;Transient boundary condtion;Vadose water;Water flow;Water levels
Date:	2016-01-01
Issue Date:	2026-04-23 11:50:31 (UTC+8)
Publisher:	Chinese Geoscience Union;Taiwan: 中華民國地球科學學會
Abstract:	摘要： We conducted a time-lapse monitoring study during a well-pumping test at the Pengtsuo site in Pingtung, Taiwan. Water-level gauges were installed in four wells (P1, W1, O1, and O2) at the Pengtsuo site with different screen depths for the observation. We designed the pumping test to be executed in three phases: the background, the stepwise-pumping, and the continuous-pumping phases. The survey line crossed the four wells so that a comparison would be possible between the resistivity measurements and the water-level records. The resistivity differences relative to the pre-pumping background show that electrical resistivity imaging (ERI) can resolve changes due to dewatering from pumping activity. The time-lapse resistivity images reveal that the maximum resistivity increase took place at the locations in the vadose zone instead of at the groundwater surface. The variation in the resistivity differences in the vadose zone correlated to the change in groundwater level in the stepwise phase. On the other hand, the resistivity-difference change was not fully consistent with the groundwater-level change in the continuous-pumping phase. We attribute the abnormal ERI signals to the dynamic non-equilibrium of the water movement in the vadose zone. The findings suggest that pumping designs can affect the changing resistivity differences and water-content distribution patterns. We show the potential of the ER method to reveal both the water flow and water-content changes in the vadose zone with different transient boundary conditions. 出版者： Taiwan: 中華民國地球科學學會出版日期： 2016-02-01 出處： TAO : Terrestrial, atmospheric, and oceanic sciences, 2016-02, Vol.27 (1), p.59-71 資源來源：華藝CEPS中文電子期刊服務版權： 2016. This work is licensed under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. 識別號： ISSN: 1017-0839 識別號： ISSN: 2223-8964 識別號： ISSN: 2311-7680 識別號： EISSN: 2311-7680 識別號： EISSN: 1017-0839 識別號： DOI: 10.3319/TAO.2015.08.20.01(T)
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