D-R-A-F-T
Overview
This user's guide described the generalized finite element computer program (model)
for vertically averaged sediment transport in open channel flows. It is the sediment
transport companion for the RMA2 hydrodynamic model within the TABS-MD
Numerical Modeling System.
Origin Of The 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 2D 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).
Applications For SED2D
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.
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