HR: 09:45h
AN: H11H-08    [Abstracts]
TI: Should We Be Concerned about Second Order Approximations in Hydrologic Models?
AU: Choi, H I
EM: hichoi@uiuc.edu
AF: Environmental Hydrology and Hydraulic Engineering, Department of Civil and Environmental Engineering, University of Illinois, 205 North Mathews Avenue, Urbana, IL 61801 United States
AU: * Kumar, P
EM: kumar1@uiuc.edu
AF: Environmental Hydrology and Hydraulic Engineering, Department of Civil and Environmental Engineering, University of Illinois, 205 North Mathews Avenue, Urbana, IL 61801 United States
AU: Liang, X
EM: xliang@uiuc.edu
AF: Atmospheric Environment Section, Illinois State Water Survey, University of Illinois, 2204 Griffith Dr., Champaign, IL 61820 United States
AB: Hydrologic models used in land-atmosphere interaction studies have seen significant grown in sophistication over the years. However, soil-moisture transport equations remain rather simplistic. There is a growing trend of implementing these models at ever increasing resolutions. This necessitates the need to incorporate processes that arise at smaller scales but could be neglected for larger scales studies. This presentation will show that the soil-moisture transport can be represented as a scale dependent function that uses second order approximations for parameterization. These parameterizations incorporate properties such as the dependence of soil-moisture on the sub-grid statistics of topographic attributes (slopes and curvatures). These statistics change with the resolution of the model, and therefore, these formulations allow better characterization of vertical and lateral soil-moisture transport as model resolution changes.
DE: 1800 HYDROLOGY
DE: 1829 Groundwater hydrology
DE: 1866 Soil moisture
DE: 1875 Unsaturated zone
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting