HR: 11:15h
AN: H31G-04    [PDF]
TI: Hillslope-storage Dependent Drainable Porosity to Account for Capillarity Effects on the Dynamic Response of Complex Hillslopes
AU: Hilberts, A
EM: arno.hilberts@wur.nl
AF: Hydrology and Quantitative Water Management, Department of Environmental Sciences, Wageningen University, Nieuwe Kanaal 11, Wageningen, 6709 PA Netherlands
AU: * Troch, P A
EM: peter.troch@wur.nl
AF: Hydrology and Quantitative Water Management, Department of Environmental Sciences, Wageningen University, Nieuwe Kanaal 11, Wageningen, 6709 PA Netherlands
AU: Paniconi, C
EM: claudio.paniconi@inrs-ete.uquebec.ca
AF: Eau, Terre et Environnement, INRS, Universite de Quebec, 2800 rue Einstein, Sainte-Foy, CP 7500 Canada
AB: Specific yield is a parameter used to quantify the available amount of water for drainage. The instantaneous release of water from the aquifer during drainage however is captured by a related parameter, viz drainable porosity. In landscapes with relatively shallow groundwater table the drainable porosity is among others a function of the local total subsurface storage. Here we derive an analytical expression to compute the drainable porosity as a function of water table depth and soil hydraulic parameters. This expression then allows us to extend the hillslope-storage Boussinesq equation, recently introduced by the authors, to account for capillarity effects during free drainage from complex hillslopes. We test our model for different soil types and compare our results with a 3D Richards' equation based numerical model.
DE: 1829 Groundwater hydrology
DE: 1836 Hydrologic budget (1655)
DE: 1854 Precipitation (3354)
DE: 1860 Runoff and streamflow
DE: 1875 Unsaturated zone
SC: Hydrology [H]
MN: 2003 Fall Meeting