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Title: A numerical model simulating flow, contaminant, and sediment transport in watershed systems (WASH12D)
Authors: Pennsylvania State University. Department of Civil and Environmental Engineering
Yeh, Gour-Tsyh (George), 1940-
Cheng, Hwai-Ping.
Cheng, Jing-Ru C., 1963-
Lin, Hsin-Chi J.
Keywords: Contaminant and sediment transport
Darcy's velocity
Diffusion wave
Galerkin finite element method
Manning's equation
One-dimensional river/stream network
Overland flow
Richard's equation
Subsurface flow
Watershed system
Publisher: Coastal and Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; CHL-98-15.
Description: Technical report
This report presents the development of a numerical model simulating water flow, contaminant transport, and sediment transport in watershed systems. The model is composed of two modules: flow and transport. Three options are provided in modeling the flow module in river/stream network and overland regime: the kinematic wave approach, diffusion wave approach, and dynamic wave approach. The kinematic and diffusion wave approaches are known to be numerically robust in terms of numerical convergency and stability, i.e., they can generate convergent and stable simulations over a wide range of ground surface slopes in the entire watershed. The question is the accuracy of these simulations. The kinematic wave approach usually produces accurate solutions only over the region of steep slopes. The diffusion wave approach normally gives accurate solutions over the region of mild to steep slopes. However, neither approach has the ability to yield accurate solutions over the region of small slopes, in which the inertial forces are no longer negligible compared with the gravitational forces. The kinematic wave approach cannot even address the problems of backwater effects. On the other hand, a dynamic wave approach, having included all forces, can theoretically have the potential to generate accurate simulations over all ranges of slopes in a watershed.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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