Impact of watershed topography on hyporheic exchange |
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| Institution: | 1. Department of Civil and Environmental Engineering, Stanford University, 473 Via Ortega, 94305 Stanford, CA, USA;2. Center for Applied Geosciences, University of Tübingen, Hoelderlinstrasse 12, D-72074 Tübingen, Germany;1. State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an 710048, Shaanxi, China;2. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, Jiangsu, China;3. Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee 32306, FL, USA;4. Changjiang River Scientific Research Institute, Wuhan 430010, Hu Bei, China;5. College of Water & Architectural Engineering, Shihezi University, Shihezi City 832000, Xinjiang, China |
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| Abstract: | Among the interactions between surface water bodies and aquifers, hyporheic exchange has been recognized as a key process for nutrient cycling and contaminant transport. Even though hyporheic exchange is strongly controlled by groundwater discharge, our understanding of the impact of the regional groundwater flow on hyporheic fluxes is still limited because of the complexity arising from the multi-scale nature of these interactions. In this work, we investigate the role of watershed topography on river-aquifer interactions by way of a semi-analytical model, in which the landscape topography is used to approximate the groundwater head distribution. The analysis of a case study shows how the complex topographic structure is the direct cause of a substantial spatial variability of the aquifer-river exchange. Groundwater upwelling along the river corridor is estimated and its influence on the hyporheic zone is discussed. In particular, the fragmentation of the hyporeic corridor induced by groundwater discharge at the basin scale is highlighted. |
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