4/98
SED2D-WES Version 4.3 Beta
SED2D-WES
1.
INTRODUCTION
1.1
Purpose
This report describes the use of a generalized computer program (model) for two,-dimensional, vertically
averaged sediment transport in open channel flows. The current version of this program is SED2D-WES Version
4.3 Beta.
1.2
Origin of Program
The initial code development was accomplished by Dr. Ranjan Ariathurai (l974) in partial fulfillment of
the requirements for his Doctor of Philosophy degree at the University of California, Davis. That work, a 2-D
model in the horizontal plane, was extended to include the vertical plane by Ariathurai, MacArthur, and Krone
(l977) under contract with the US Army Corps of Engineers, Dredged Material Research Program. Dr. Ariathurai
consulted with Waterways Experiment Station (WES) personnel during the early testing phases of the program
during which time he made several enhancements to the program.
Starting with that basic work, WES personnel and Dr. Ariathurai produced a code known as STUDH. Dr.
Ariathurai subsequently developed several new versions of the models with funding from WES. Selected features
of those models were adopted and placed in the STUDH model. STUDH Version 3.3 was a standard tool for
sediment transport analysis during the period 1983 to 1993. During the period 1993 to 1995 STUDH was
substantially rewritten and modernized by WES personnel to create the program SED2D-WES (version 1.2). This
modernization was undertaken in order to improve model maintenance and to facilitate the addition of new
features to the code. A series of major revisions to SED2D-WES have been performed recently; adding marsh
porosity compatibility and rewriting the cohesive bed layering routines (version 2.0); adding one-dimensional (1-
D) elements (version 3.0); and adding the automatic boundary specification in reversing tidal flows including
boundary buffering and automatic computation options for dispersion coefficients (version 4.0).
1.3
Potential Applications
SED2D-WES can be applied to clay or sand bed sediments where flow velocities can be considered two-
dimensional in the horizontal plane (i.e., the speed and direction can be satisfactorily represented as a
depth-averaged velocity). It is useful for both deposition and erosion studies and, to a limited extent, for stream
width studies. The program treats two categories of sediment: 1) noncohesive, which is referred to as sand herein;
and 2) cohesive, which is referred to as clay.
5
WORKING DRAFT
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