D-R-A-F-T
WC CARD: Settling Velocity
Required
Card Description: This settling velocity is an effective fall velocity which goes up
with grain size, goes down with increasing turbulence, goes up with increasing
aggregation (cohesive sediments), and goes up if a too large value of CLDE. WC is
used by both sand and clay.
Field
Variable
Value Description
0, C 1-2
IC1
WC
Card group identifier.
Option 1: Global assignment to all nodes, starting
0,C3
IC3
b/
with = J
T
Option 2: Explicit assignment for IMAT = J
E
Option 3: Explicit assignment for Element = J
N
Option 4: Explicit assignment for Node = J
1
J
+
Starting or explicit value
≥0
2
VS(J)
Settling velocity (m/sec)
<0
Default = 0.0 (no deposition)
Tip: The best starting point for noncohesive sediments are fall velocities for
spherical particles of equal diameters. For data on appropriate values for settling
velocities see "Some Fundamentals of Particle Size Analysis," 1957, Committee on
Sedimentation, Interagency Committee on Water Resources. For cohesive
sediments, the settling velocity of particles can vary enormously with sediment type,
salinity, turbulence, and other chemical and physical conditions. Laboratory or field
tests are needed to define effective settling velocities.
130 Run Control WC Card
Users Guide To SED2D-WES
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