produces an EFFECTIVE WIDTH and an EFFECTIVE DEPTH. Variables in
the following equations are illustrated in Figure 2.8.
Σ Di Ai Di 2/3
EFD =
Equation 2-31
Σ Ai Di 2/3
Σ Ai Di 2/3
EFW =
Equation 2-32
5/3
EFD
where
Ai = Area of panel i, ∆X Di
Di = Average depth of panel i, 1/2 (A+B)
EFD = Effective Depth of the cross section
EFW = Effective Width of the cross section
Figure 2.8. Calculating effective depths and widths.
In SAM the slope can be either the bed slope, water surface slope, or energy
slope since all are parallel in normal depth computations. Effective values are
calculated in SAM after the normal depth has been determined. Although
effective values are calculated for both overbanks and the channel, only the
channel values are written into the sediment transport input file for sediment
transport calculations.
27
Chapter 2
Theoretical Basis for SAM.hyd Calculations
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