A coupled upland-erosion and instream hydrodynamic-sediment transport model for evaluating sediment transport in forested watersheds
Conroy, W. J.; Hotchkiss, R. H.; Elliot, W. J. 2006.
A coupled upland-erosion and instream hydrodynamic-sediment transport model for evaluating sediment transport in forested watersheds.
Transactions of the American Society of Agricultural and Biological Engineers. 49(6): 1-10.
Keywords: Erosion modeling, Hydrodynamic modeling, Watershed models, TMDLs, CCHE1D, WEPP, sediment transport
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Abstract:
This article describes a prototype modeling system for assessing forest management-related erosion at its source
and predicting sediment transport from hillslopes to stream channels and through channel networks to a watershed outlet.
We demonstrate that it is possible to develop a land management tool capable of accurately assessing the primary impacts
of spatiotemporally varied forest management practices on sediment yield and delivery at hillslope to watershed scales in
a single simulation. The modeling system consists of four components: (1) the TOpographic ParameteriZation (TOPAZ) model
for discretizing hillslope and channel elements, (2) the Water Erosion Prediction Project (WEPP) model for evaluating
hillslope-scale surface erosion processes, (3) the National Center for Computational Hydrodynamics and Engineering.s
one-dimensional (CCHE1D) hydrodynamic-sediment transport model, and (4) an interface program to manage relational
databases and data transfer between modules. The coupled models were calibrated and validated with observed flow and
sediment load data from the North Fork Caspar Creek Experimental Watershed in coastal northern California. The coupled
models. predictions of peak flow rate and total flow volume were not significantly different from observed values. Predicted
sediment concentrations were significantly different from observed values, but within typical ranges for sediment transport
equations. We recommend that the WEPP model be improved to allow access to sub-daily time scale results so that it can be
better integrated with other watershed models.
Moscow FSL publication no. 2006r
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