A lumped conceptual model to simulate groundwater level time-series |
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| Affiliation: | 1. School of Civil Engineering, Sun Yat-sen University, Guangzhou, 510275, China;2. College of Science, Earth Science Department, Sultan Qaboos University, P.O. Box 36, Muscat, 123, Oman;3. School of Environmental Engineering, Technical University of Crete, University Campus, 73100, Chania, Greece;4. Hydrological Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, 20771, MD, USA;5. Department of Civil and Environmental Engineering, Pennsylvania State University, University Park, PA, 16802, USA;1. Swiss Federal Institute of Technology Zürich, Department of Environmental Systems Science, 8092 Zurich, Switzerland;2. Eawag – Swiss Federal Institute of Aquatic Science and Technology, Department of Water Resources and Drinking Water, 8600 Dübendorf, Switzerland;3. University of Neuchâtel, Centre for Hydrogeology and Geothermics (CHYN), 2000 Neuchâtel, Switzerland;1. Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei 10617, Taiwan, ROC;2. Department of Water Resources and Environmental Engineering, Tamkang University, New Taipei City 25137, Taiwan, ROC;1. Berendrecht Consultancy, Stakenbergerhout 107, 3845 JE Harderwijk, The Netherlands;2. TNO Geological Survey of the Netherlands, P.O. Box 80015, 3508 TA Utrecht, The Netherlands |
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| Abstract: | Lumped, conceptual groundwater models can be used to simulate groundwater level time-series quickly and efficiently without the need for comprehensive modelling expertise. A new model of this type, AquiMod, is presented for simulating groundwater level time-series in unconfined aquifers. Its modular design enables users to implement different model structures to gain understanding about controls on aquifer storage and discharge. Five model structures are evaluated for four contrasting aquifers in the United Kingdom. The ability of different model structures and parameterisations to replicate the observed hydrographs is examined. AquiMod simulates the quasi-sinusoidal hydrographs of the relatively uniform Chalk and Sandstone aquifers most efficiently. It is least efficient at capturing the flashy hydrograph of a heterogeneous, fractured Limestone aquifer. The majority of model parameters demonstrate sensitivity and can be related to available field data. The model structure experiments demonstrate the need to represent vertical aquifer heterogeneity to capture the storage–discharge dynamics efficiently. |
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| Keywords: | Groundwater level simulation Observation borehole hydrograph Lumped conceptual modelling AquiMod |
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