of buffer chambers to each boundary node. This procedure results in memory of the
history of concentrations crossing the boundary, delays full specification of the
nominal boundary concentration Cb, and generally provides more realistic boundary
conditions. Furthermore, the buffering also provides a buffer for the changes that
any plan alternatives to be tested may have on the boundary conditions.
Boundary conditions
Water levels, flows, concentrations, stage/discharge relationships, etc., that are
specified at the boundaries of the area being modeled. A specified tailwater
elevation and incoming upstream discharge are typical boundary conditions.
Boundary effect
A consequence of dissimilarities between the model boundary conditions and the
conditions occurring in the prototype at the location of the model boundaries. This
effect may be minimized if the model's boundaries are far from the area of interest.
Boundary node
Any node which lies along an exterior element edge, or demarcates the wet/dry
interface.
Bulk Shear Stress
Card
A term which comes from the 1960-1980's when computers received data on
punched cards. Each card supplied the computer with a line of data.
The TABS-MD programs use cards in the same way. The difference is that the card
data are stored in a disk file and not in a filing cabinet.
Card image
An ASCII line of data for the computer to read.
Coastal and Hydraulics Laboratory (CHL)
The US Army Engineer Research and Development Center, at the Waterways
Experiment Station, Coastal Hydraulics Laboratory, Vicksburg, Mississippi, is the
principal Corps agency for engineering research and experimentation in hydraulics
and hydrodynamics and is one of the largest hydraulics laboratories in the world.
The Coastal Hydraulics Laboratory provides TABS Numerical Model maintenance
and support for Army Corps installations. To find out about availability and support
for the TABS modeling system, contact the Coastal and Hydraulics Laboratory via e-
mail at SMS@erdc.usace.army.mil, or call (601) 634-3339.
Cohesiveness
The cohesion of a sediment particle is associated with soil type and particle size.
Cohesion increases with decreasing particle size for the same type of material.
Cohesive sediment is characterized by the dispersed particle fall velocity, flocculated
Glossary of Terms 153
Users Guide To SED2D-WES
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