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

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Authors:Li Xingyu; Nan Tian; Wang Xinjuan; Li Peng; Xie Zhenhua; Shao Jingli
Author Affiliations:Primary:
China University of Geosciences, Beijing, China
Beijing Brigade of Hydrogeological and Engineering Geology, China
Volume Title:Zhongguo Yanrong Carsologica Sinica
Source:Zhongguo Yanrong = Carsologica Sinica, 33(3), p.280-287. Publisher: Gai Kan Bianjibu (Institute of Karst Geology, People's Republic of China), Guilin, China. ISSN: 1001-4810
Publication Date:2014
Note:In Chinese with English summary. 21 refs.; illus., incl. 1 table, sketch maps
Summary:A wellhead protection area (WHPA) is an effective technical method and basic standard for safeguarding groundwater resources. Frequently used methods for WHPA delineation 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 delineation for a concealed karst aquifer due to its heterogeneity, anisotropy, parameter uncertainty, and development under Quaternary or other bedrock. This study takes two groundwater sources, the Daxing Niantan wellhead and Tongzhou Longwangzhuang wellhead located in the concealed karst system southeast of Beijing, as examples to study the numerical simulation method of WHPA delineation. The numerical simulation model, which takes three-dimensional transient flow of Quaternary strata and the 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 based on 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 the same as the boundary of the karst WHPA. Controlling Quaternary water contamination needs to be enhanced to prevent pollution of karst water.
Subjects:Applications; Aquifers; Ground water; Karst hydrology; Numerical analysis; Numerical models; Pollution; Preventive measures; Protection; Simulation; Water pollution; Water wells; Asia; Beijing China; China; Far East; Hebei China; Daxing China; Tongzhou China
Coordinates:N393849 N393849 E1162448 E1162448
Record ID:2020000070
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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