The effect of typical geological heterogeneities on the performance of managed aquifer recharge: physical experiments and numerical simulations |
| |
Authors: | Wu Peipeng Shu Longcang Comte Jean-Christophe Zuo Qiting Wang Mei Li Fulin Chen Huawei |
| |
Institution: | 1.School of Water Conservancy Engineering, Zhengzhou University, Zhengzhou, 450001, China ;2.Henan Key Laboratory of Groundwater Pollution Prevention and Rehabilitation, Zhengzhou, 450001, China ;3.Zhengzhou Key Laboratory of Water Resource and Environment, Zhengzhou, 450001, China ;4.College of Hydrology and Water Resource, Hohai University, Nanjing, 210098, China ;5.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, 210098, China ;6.School of Geosciences, University of Aberdeen, Aberdeen, UK ;7.Water Resources Research Institute of Shandong Province, Jinan, 250013, China ;8.Key Laboratory of Water Resources and Environment, Jinan, 250013, China ; |
| |
Abstract: | Understanding the role of geological heterogeneity on the performance of managed aquifer recharge (MAR) in terms of effective groundwater storage is crucial to design MAR systems. Natural aquifers are affected by a variety of geologic strata and structures at different scales, which are responsible for wide ranging hydraulic properties. This study combines physical experiments and numerical modeling to investigate the effect of geologic structures commonly encountered in sedimentary environments, on MAR-induced groundwater flow patterns using injection wells. Models were conceptualized and parametrized based on the hydrogeological conditions of Tailan River basin in arid NW China, which hosts a typical, structurally complex, alluvial-fan aquifer system affected by sediment layering, clay lenses and anticline barriers, and is extensively studied for the strategic potential of MAR in addressing water shortages in the region. Results showed that, compared to a homogeneous scenario, high-permeability aquifer layers shortened groundwater ages, decreased the thickness of the artificially recharged water lenses (ARWLs), and shifted the stagnation points downstream. Clay lenses increased groundwater residence times but had little effect on spatial flow patterns due to their elongation parallel-to-flow direction. Overall groundwater ages, as well as the thickness of ARWLs created through injection on the upstream side of an anticline, increased, and this to a larger extent than through injection on the downstream side, which did not increase significantly compared to the homogeneous scenario. Results provide insights for MAR optimization in naturally heterogeneous aquifer systems, along with a benchmark tool for application to a wide range of typical geological conditions. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|