Distributed Hydrologic Modeling of Humid Regions

by Fred L. Ogden, (A.M.ASCE),
Brent A. Watts, (S.M.ASCE),
B. Saghafian,

Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water


Distributed physically-based hydrologic modeling of humid watersheds with shallow soils is complicated by non-Hortonian runoff production mechanisms. This paper presents a numerical experimental methodology for evaluating the frequency, duration and extent of saturation excess variable source areas. The methodology considers rainfall spatio-temporal variability and antecedent moisture conditions, with and without soil macropores in the downslope direction. This study allows examination of non-Hortonian runoff production mechanisms with implications for two-dimensional physically based watershed modeling.

Subject Headings: Hydrologic models | Watersheds | Two-dimensional models | Humidity | Soil water | Runoff | Numerical methods

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