Using numerical modelling to evaluate the capillary fringe groundwater ridging hypothesis of streamflow generation |
| |
| Institution: | 1. Department of Geography, King''s College London, Strand, London WC2R 2LS, UK;2. School of Geographical Sciences, University of Bristol, University Road, Bristol BS8 1SS, UK;3. Department of Forest Engineering, Oregon State University, Corvallis, OR, USA;1. Centre for Ecology and Hydrology, Crowmarsh Gifford, Wallingford, Oxfordshire OX10 8BB, UK;2. UCL Department of Geography, University College London, Gower Street, London WC1E 6BT, UK;1. Institute for Environmental Sustainability, Mount Royal University, Calgary, Alberta T3E 6k6, Canada;2. Environmental Engineering Program, University of Northern British Columbia, Prince George, British Columbia V2N 4Z9, Canada;3. Forests, Lands and Natural Resources Operations, 103-2100 Labieux Rd, Nanaimo, British Columbia V9T6E9, Canada;4. Faculty of Land and Food Systems, University of British Columbia, 2357 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada;1. U.S. Geological Survey, Sacramento, CA, United States;2. U.S. Geological Survey, Reston, VA, United States;3. U.S. Geological Survey, Lawrenceville, NJ, United States;4. U.S. Geological Survey, Northborough, MA, United States;5. Lawerence Livermore National Laboratory, Livermore, CA, United States;1. Desert Research Center, Division of Water Resources and Arid Land, Geophysical Exploration Dept., Cairo, Egypt;2. Desert Research Center, Division of Water Resources and Arid Land, Hydrogeochemistry Dept., Cairo, Egypt;1. Hydrology Program, Department of Earth and Environmental Science, New Mexico Institute of Mining and Technology, Socorro, NM 87801, USA;2. Department of Civil and Environmental Engineering, Vanderbilt University, Nashville, TN 37235, USA;3. Consortium for Risk Estimation with Stakeholder Participation (CRESP), Vanderbilt University, Nashville, TN 37235, USA;4. Department of Earth and Environmental Science, Vanderbilt University, Nashville, TN 37235, USA |
| |
| Abstract: | The controls on pre-event water contributions to streamflow are still poorly understood, despite a number of proposed processes. One of the most common is the capillary fringe induced groundwater ridging mechanism, identified in many environments as a control on rapid mobilization of groundwater into the channel during events. Nevertheless, despite widespread acceptance, there is little evidence for such a phenomenon outside of particular environments and test cases for which it has been quantified. We use a flow and transport modelling tool to test a number of hypotheses concerning the capillary-fringe groundwater ridging mechanism. The original Abdul and Gilham (Abdul, A.S., Gillham, R.W., 1989. Field studies of the effects of the capillary fringe on streamflow generation. Journal of Hydrology 112, 1–18) laboratory experiment (that is still regarded by those working in the field as the main proof-of-concept) is replicated numerically within a 2D finite element code. An indication of the ‘spaces’ of applicability of the process in the context of the laboratory experiment is determined (soil type, antecedent moisture, riparian volume, slope, rainfall intensity). We show that in only a limited number of cases, high proportions of pre-event water are sustained from this process. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
