Use of geochemical modeling to evaluate the hydraulic connection of aquifers: a case study form Chianan Plain, Taiwan

doi:10.1007/s10040-007-0209-6

CNU IR > College of Sustainable Environment and Recreation > Dept. of Tourism Management > Periodical Articles > Item 310902800/21626

Please use this identifier to cite or link to this item: https://ir.cnu.edu.tw/handle/310902800/21626

Title:	Use of geochemical modeling to evaluate the hydraulic connection of aquifers: a case study form Chianan Plain, Taiwan
Authors:	Hsueh-Yu Lu Tsung-Kwei Liu Wen-Fu Chen Tsung-Ren Peng Chung-Ho Wang Meng-Hsun Tsai Tai-Sheng Liou 陳文福
Contributors:	溫泉產業研究所
Keywords:	Aquifer correlation Chronostratigraphy Geochemical modeling Groundwater age Taiwan
Date:	2008-02
Issue Date:	2009-08-03 10:42:09 (UTC+8)
Abstract:	Aquifers are generally composed of highly permeable layers that can conduct a considerable amount of groundwater. Traditionally, aquifer units are correlated through the concept of lithostratigraphy. For low-permeable aquifers, it is difficult to define the spatial distribution of hydrogeological units, and this study attempts to use geochemical modeling to identify the groundwater flow paths in an area of Taiwan. Multiple geochemical analyses, including groundwater chemistry; stable isotopic compositions of hydrogen, oxygen and carbon; and radiocarbon contents were performed. Using these parameters as the constraints of geochemical models, the hydraulic connection was examined between pairs of possibly interlinked wells along four selected cross sections, and the conceptual groundwater model was accordingly established. The resultant model suggests that the hydraulic connection between aquifers should be correlated with the concept of chronological stratigraphy, especially for low-permeable, unconsolidated aquifers. Using Darcy’s law, the hydraulic conductivities of the fine-sand aquifers were estimated to be between 3.14 × 10−5 and 1.80 × 10−4 m/s, which are roughly one order of magnitude higher than those derived by in situ pumping tests. The substantial extraction of groundwater over a long period in the studied area could accelerate groundwater flow, leading to an overestimation of the aquifer permeability.
Relation:	Hydrogeology journal 16(1)：p.139-154
Appears in Collections:	[Dept. of Tourism Management] Periodical Articles

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