D-R-A-F-T
fall velocity of the suspension, the clay and nonclay mineralogy, organic content, and
the cation exchange capacity.
Cohesive Sediment
Sediments whose resistance to initial movement or erosion is affected mostly by
cohesive bonds between particles. A sediment grain size descriptor, commonly
known as clay.
Cold start
A model run using initial conditions that are not expected to be close to conditions as
solved by the model, i.e., a level water surface elevation and velocity values of zero.
Compiler
A special computer program which converts a higher level language (such as
FORTRAN) to a coded set of machine dependent instructions (fetch the contents of
REGISTER 1). All TABS-MD programs are written for a FORTRAN-77 compiler.
Concentration of sediment
The dry weight of sediment per unit volume of water-sediment mixture, i.e., mg/L.
Consolidation is the process of compaction of a deposit with time or with overburden
pressure.
Continuity
The term continuity refers to conserving mass within the model. The continuity
check lines are typically used to estimate the flow rates and serve as an error
indicator. The SED2D model ???? satisfied mass conservation in a weighted
residual manner. The continuity lines can be used to check mass conservation a
different way, by direct integration. Large discrepancies between the two methods
indicate probable oscillations and a need to improve model resolution and/or to
correct large boundary break angles.
Although continuity checks are optional, they are a valuable tool for diagnosing a
converged steady state solution. For steady state, the continuity check lines should
represent total flow in equals total flow out. However, if the continuity checks
indicate a mass conservation discrepancy of 3%, you may want to address the
resolution in the geometry. Large mass conservation discrepancies can lead to
difficulty when the hydrodynamics are used for transport models, RMA4 and/or
SED2D.
Continuity line
(or Continuity Check Line)
A string of corner nodes across which the total flow (or constituent if running
RMA4) can be measured. The use of continuity lines also provides a convenient
way to specify boundary conditions.
154 Glossary of Terms
Users Guide To SED2D-WES
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