Development of a Hydrologic Model with Both Spatially Distributed and Physically Based Capabilities

by Dennis L. Johnson,
Arthur C. Miller,

Document Type: Proceeding Paper

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


A distributed hydrologic model is developed at The Pennsylvania State University for use with rasterized data bases. The purpose of the Terrestrial Hydrologic Model or THM is to investigate both spatial and temporal data sets and their ramifications on hydrologic modeling. All physical drainage basin properties are obtained from a Digital Elevation Model or DEM. Hydrologic abstractions may be estimated by three methods: a constant infiltration rate, the Soil Conservation Service curve number method, or solution of the Green-Ampt equation. Overland flow is computed by a kinematic wave approximation and channel routing is performed using the Muskingum-Cunge method.

Subject Headings: Hydrologic models | Spatial distribution | Spatial data | Kinematic waves | Drainage basins | Overland flow | Infiltration

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