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The weir slope is the downstream element of the boundary element pair defining
a weir.   The following constants have to be specified on the
line beneath the *FLUID SECTION,TYPE=CHANNEL WEIR SLOPE card:
- the width   
- the slope 
 (if (if the slope is calculated from the
  coordinates of the end nodes belonging to the element) the slope is calculated from the
  coordinates of the end nodes belonging to the element)
- the length  (if (if the length is calculated from the
  coordinates of the end nodes belonging to the element) the length is calculated from the
  coordinates of the end nodes belonging to the element)
- the trapezoid angle   
- the grain diameter  for the White-Colebrook law or the Manning
  constant for the White-Colebrook law or the Manning
  constant for the Manning law (in the latter case the user has to specify
  the parameter MANNING on the *FLUID SECTION card) for the Manning law (in the latter case the user has to specify
  the parameter MANNING on the *FLUID SECTION card)
- the number of the upstream weir crest element
The meaning of  and
 and  can be derived from Figure
106. The value of
 can be derived from Figure
106. The value of  is used to determine the critical
depth on the crest. Moreover, it is used in the Bresse equation in case the
flow is determined by the downstream conditions (inundated crest). It should
simulate the mean slope in the absence of the weir. The length
 is used to determine the critical
depth on the crest. Moreover, it is used in the Bresse equation in case the
flow is determined by the downstream conditions (inundated crest). It should
simulate the mean slope in the absence of the weir. The length  of the weir
is shown in Figure 108.
 of the weir
is shown in Figure 108.
Example files: channel7.
 
 
 
 
 
 
 
  
 Next: Discontinuous Slope
 Up: Fluid Section Types: Open
 Previous: Weir Crest
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guido dhondt
2016-07-31