Figure 1. Cohesive bed behavior as a function of shear stress

Settling velocity (WC cards)

Bed structure (SB and CL cards)

2_sed2dhec
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SED2D-WES Version 4.3 Beta

τ (bed shear stress)

Mass erosion by layers

Particle erosion

No deposition or erosion

Figure 1. Cohesive bed behavior as a function of shear stress

Dry density as specified on the CI cards can be calculated by the following formula:

ρ S = density of individual sediment particles

ρ B = bulk (wet) density of sediment

ρ w = density of water entrained in the sediment

Note that a lower density for layer types 1 - 4 will result in fluffier deposits, increased thickness of deposited layers,

and greater bed change.

In the field, the density and shear strength of cohesive layers generally increase as they consolidate. The

shifting to higher layer types in the program accounts for this, but the user must accurately specify the parameters

for each layer type in order to obtain a realistic solution. The greatest accuracy will be achieved by specifying a

WORKING DRAFT

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