Simulation of Hillslope Hydrologic Response to Snowmelt in Southwestern Idaho

by Everett P. Springer, USDA, Agricultural Research Service, Northwest Watershed Research Cent, Boise, ID, USA,
Gordon R. Stephenson, USDA, Agricultural Research Service, Northwest Watershed Research Cent, Boise, ID, USA,
Terry D. Wadsworth, USDA, Agricultural Research Service, Northwest Watershed Research Cent, Boise, ID, USA,



Document Type: Proceeding Paper

Part of: Watershed Management in the Eighties

Abstract:

A two-dimensional, variably saturated porous media flow model was applied to vertical hillslope cross section on a first order study basin in southwestern Idaho. The dominant source of streamflow is deep snowdrifts which form on the northfacing slopes. Instrumentation includes piezometers, observation wells, and neutron probe access tubes. Geologic logs obtained from the well sites identified three basic porous media layers: (1) soil layer; (2) altered basalt; and (3) fractured basalt. Streamflow was measured by weirs above and below the instrumented cross section. Tests were performed to characterize the conductivity of the basalts, and soil cores were taken to determine the hydraulic properties of this layer.

Subject Headings: Two-dimensional models | Porous media flow | Snow | Slopes | Hydraulic properties | Volcanic deposits | Two-dimensional flow | Idaho | United States

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