Application of the numerical simulation method in concealed karst wellhead for protection area delimitation and contamination prevention

LI Xing-yu; NAN Tian; WANG Xin-juan; LI Peng; XIE Zhen-hua; SHAO Jing-li

Volume 33 Issue 3

Sep. 2014

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Article Navigation > CARSOLOGICA SINICA > 2014 > 33(3): 280-287

LI Xing-yu, NAN Tian, WANG Xin-juan, LI Peng, XIE Zhen-hua, SHAO Jing-li. Application of the numerical simulation method in concealed karst wellhead for protection area delimitation and contamination prevention[J]. CARSOLOGICA SINICA, 2014, 33(3): 280-287.

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Application of the numerical simulation method in concealed karst wellhead for protection area delimitation and contamination prevention

1.
China University of Geosciences (Beijing)
2.
Hydrogeological and Engineering Geological Team of Beijing

Publish Date: 2014-09-25

Abstract

Abstract

A wellhead protection area (WHPA) is an effective technical method and basic standard for safeguardking groundwater resources. Frequently-used methods for WHPA delimitation include the empirical approach, analytical methods, tracing tests and numerical simulation. Of these, numerical simulation is preferred for complicated hydrogeological conditions. It is quite difficult to use numerical simulation methods in WHPA delimitation for a concealed karst aquifer, as a result of its heterogeneity, anisotropy, parameter uncertainty and development under Quaternary or other bedrock. This study takes two groundwater sources, Daxing Niantan wellhead and Tongzhou Longwangzhuang wellhead, which are located in the concealed karst system southeast of Beijing, as examples to study the numerical simulation method of WHPA delimitation. The numerical simulation model, which takes the three-dimensional transient flow of Quaternary and karst aquifer into consideration, is established by the GMS. Then particle tracing technology is used to confirm the WHPA, taking a tracing time of 100 days as the primary protection zone and 1,000, days as the secondary protection zone. Related pollution-control measures are proposed according to the WHPA results. Additionally, given that leakage from the overlying Quaternary loose-porosity aquifer is the primary recharge source for the concealed karst aquifer, the boundary of the Quaternary WHPA is as the same as the boundary of the karst WHPA. Control of the Quaternary water contamination needs to be enhanced to prevent pollution of the karst water.
- concealed karst,
- wellhead protection area,
- numerical simulation method,
- particle tracing

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References(21)

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