D-R-A-F-T
Deposition
The mechanical or chemical processes through which sediments accumulate in a
resting place.
Diffusion
Dirichlet Boundary Condition Specification
To de-flocculate or disaggregate compound particles, such as clays and fine silts,
into individual component particles.
Diverge
The inability of the numerical model to achieve convergence by the iteration
technique.
Element
A segment, triangle, or quadrilateral shape composed of corner nodes and mid-side
nodes. An element must be `connected' to a neighboring element.
An element is composed of a list of nodes in a counterclockwise fashion and may
define a 1, 2, or 3 dimensional problem. A line segment defines a one dimensional
area, a triangle or quadrilateral defines a two dimensional area, while the three
dimensional area is defined by adding layers to an element.
SED2D can handle one dimensional and two dimensional elements.
Entrainment
The carrying away of bed material produced by erosive action of moving water.
Erosion
The wearing away of the land surface by detachment and movement of soil and rock
fragments through the action of moving water and other geological agents.
Exit boundary
A boundary condition location at which flow exits the mesh.
FastTABS
This was the predecessor to SMS. A computer program that provides a graphical,
point and click means for performing pre- and post-processing for surface water
numerical models.
Developed at the Waterways Experiment Station (WES) and Brigham Young
University (BYU).
156 Glossary of Terms
Users Guide To SED2D-WES
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