channel_geom: Channel geometry
In rivr: Steady and Unsteady Open-Channel Flow Computation

Description Usage Arguments Details Value Examples

Compute geometry relations for trapezoidal channels.

1	channel_geom(y, B, SS)

`y`	Flow depth [L].
`B`	Channel bottom width [L].
`SS`	Channel sideslope [L L^{-1}]. For a rectangular channel, `SS = 0`.

Channel geometry relations are routinely calculated in numerical solutions of steady, gradually-varied and unsteady flows. This function is used extensively by internal procedures and is made accessible to the user for convenience.

Named vector:

`A`	Flow area [L^2].
`P`	Wetted perimeter [L].
`R`	Hydraulic radius [L].
`dAdy`	Water surface width [L].
`dPdy`	First derivative of wetted perimeter w.r.t. flow depth.
`dRdy`	First derivative of hydraulic radius w.r.t. flow depth.
`DH`	Hydraulic depth [L].
`ybar`	Vertical distance from water surface to centroid of flow area [L].

1 2	channel_geom(1.71, 100, 0) # rectangular channel channel_geom(5.79, 6.1, 1.5) # trapezoidal channel with sideslope 3H:2V

          A           P           R        dAdy        dTdy        dPdy 
171.0000000 103.4200000   1.6534519 100.0000000   0.0000000   2.0000000 
       dRdy          DH        ybar 
  0.9349555   1.7100000   0.8550000 
         A          P          R       dAdy       dTdy       dPdy       dRdy 
85.6051500 26.9761419  3.1733652 23.4700000  3.0000000  3.6055513  0.4458854 
        DH       ybar 
 3.6474286  2.3281400