HR: 1330h
AN: H52A-1158    [PDF]
TI: Development of a Sediment Transport Component for DHSVM
AU: * Doten, C O
EM: colleen@hydro.washington.edu
AF: University of Washington, Department of Civil and Environmental Engineering, Box 352700, Seattle, WA 98195 United States
AU: Bowling, L C
EM: lxb@hydro.washington.edu
AF: Purdue University, Department of Agronomy, Lilly Hall of Life Sciences, 915 West State Street, West Lafayette, IN 47907 United States
AU: Maurer, E P
EM: emaurer@engr.scu.edu
AF: Santa Clara University, Department of Civil Engineering, 500 El Camino Real, Santa Clara, CA 95053 United States
AU: Voisin, N
EM: nathalie@hydro.washington.edu
AF: University of Washington, Department of Civil and Environmental Engineering, Box 352700, Seattle, WA 98195 United States
AU: Lettenmaier, D P
EM: dennisl@u.washington.edu
AF: University of Washington, Department of Civil and Environmental Engineering, Box 352700, Seattle, WA 98195 United States
AB: The effect of forest management and disturbance on aquatic resources is a problem of considerable, contemporary, scientific and public concern in the West. Sediment generation is one of the factors linking land surface conditions with aquatic systems, with implications for fisheries protection and enhancement. Better predictive techniques that allow assessment of the effects of fire and logging, in particular, on sediment transport could help to provide a more scientific basis for the management of forests in the West. We describe the development of a sediment transport component for the Distributed Hydrology Soil Vegetation Model (DHSVM), a spatially distributed hydrologic model that was developed specifically for assessment of the hydrologic consequences of forest management. The sediment transport module extends the hydrologic dynamics of DHSVM to predict sediment generation in response to dynamic meteorological inputs and hydrologic conditions via mass wasting and surface erosion from forest roads and hillslopes. The mass wasting component builds on existing stochastic slope stability models, by incorporating distributed basin hydrology (from DHSVM), and post-failure, rule-based redistribution of sediment downslope. The stochastic nature of the mass wasting component allows specification of probability distributions that describe the spatial variability of soil and vegetation characteristics used in the infinite slope model. The forest roads and hillslope surface erosion algorithms account for erosion from rain drop impact and overland erosion. A simple routing scheme is used to transport eroded sediment from mass wasting and forest roads surface erosion that reaches the channel system to the basin outlet. A sensitivity analysis of the model input parameters and forest cover conditions is described for the Little Wenatchee River basin in the northeastern Washington Cascades.
DE: 1815 Erosion and sedimentation
SC: Hydrology [H]
MN: 2003 Fall Meeting