Locating groundwater monitoring wells near cutoff walls |
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| Institution: | 1. College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China;2. Key Laboratory of Marine Environment and Ecological Education, Ocean University of China, Qingdao 266100, China;3. Technische Universität Dresden, Faculty of Environmental Sciences, Department of Forest Sciences, Chair of Forest Biometrics and Forest Systems Analysis, 01062 Dresden, Germany;1. School of Architecture and Civil Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China;2. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, 210098, China;3. Institute of Geotechnical Engineering, Yangzhou University, Yangzhou, 225127, China;1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;2. School of Architecture and Civil Engineering, Jinggangshan University, Ji’an, Jiangxi 343009, China |
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| Abstract: | This paper presents a modeling study of two five-well monitoring networks designed for a rectangular landfill oriented oblique to regional groundwater flow. Respectively, a ‘linear’ and ‘non-linear’ network ignored and considered the hydraulic head field induced by a cutoff wall at the landfill's up-gradient boundary. All wells were located the same distance (measured parallel to groundwater flow) from the down-gradient boundary of the landfill, and there was an equal spacing (measured perpendicular to groundwater flow) between wells in each network. A simulation model was used to compute the detection efficiency of each monitoring network. In the non-linear network, wells clustered near the down-gradient corner of the landfill registered a 100% detection efficiency. This strategy was effective because the cutoff wall induced convergent groundwater flow beneath the landfill. Inter-well spacing was too high, and consequently detection efficiency was lower in the linear network. Two outer wells in that network detected no contaminant plumes. This study suggests that distorted hydraulic head fields induced by partial cutoff walls should be considered when designing detection monitoring networks at landfills. |
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