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Describing near surface, transient flow processes in unconfined aquifers below irrigated lands: A deforming finite element model for heterogeneous aquifers |
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| Authors: | DR Purkey WW Wallender Nazrul Islam GE Fogg B Sivakumar |
| Institution: | aNatural Heritage Institute, Sacramento, California, CA 95616, USA bDepartment of Land, Air and Water Resources, University of California, Davis, CA 95616, USA cDepartment of Biological and Agricultural Engineering, University of California, One Shields Ave., 151 Hoagland Hall, Davis, California, CA 95616, USA dHydrologic and Environmental Systems Modeling, South Florida Water Management District, 3301 Gun Club Road, West Palm Beach, FL 33406, USA |
| Abstract: | Hydrologic models of irrigated lands generally adopt either a basin-scale or a root-zone perspective. While basin-wide macro-scale models rely on the aggregation of important spatial and temporal data across large areas, micro-scale root-zone models depend on the definition of rigid boundaries around the zone of plant–soil–water interaction. In reality, irrigation management decisions are made on a field by field basis and can interact across field boundaries. This paper first describes a shallow water table model, based on deforming finite element (DFE) framework, to characterize the near-surface field-to-field hydrologic response to various irrigation and drainage management regimes along a gently sloping alluvial fan. The model is then enhanced through changing geometry of a fluctuating water table below a series of irrigated fields. Such an enhancement also offers computational flexibility relative to the saturated–unsaturated models commonly used in micro-scale studies. The model is designed with the alluvial fan aquifers of California’s western San Joaquin Valley as reference systems. |
| Keywords: | Hydrologic modelling Unconfined aquifer Irrigation management Scale Transient flow Deforming finite element method |
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