m. Sediment Transport
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57
2.2
Mass - Balance Equation for Concentration
In a stead)' uniform flow the vertical equilibrium of the upward turbulence as
related and downward gravity-related transport can be expressed as
de
cw~.n, + e~.c-- = 0
(6)
dz
in which :
c
is sediment concentration at height z above bed
W~.m
is particle fall velocity in a fluid-sediment mixture
~,o
is sediment mixing coefficient related to current
2.3
Sediment Mixing Coefficient
Various distributions of the fluid mixing coefficient (E 0 can be found in the
literature. Herein the following distributions are given (see Fig. 3) :
1
constant : ~Co = --xu.od
(7)
o~ 1