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Figure 109:
Geometry of a discontinuous slope
|  | 
 
The discontinuous slope is the upstream element of a pair of boundary elements
simulating a change in slope. The corresponding downstream element is the
discontinuous opening.
Both are illustrated in Figure 109. The following constants have to be specified on the
line beneath the *FLUID SECTION,TYPE=CHANNEL DISCONTINUOUS SLOPE card:
- the width   
- 
 (Figure 109; if (Figure 109; 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  (Figure 109; if (Figure 109; 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 reference element
- not used
- the number of the downstream discontinuous opening element
- not used
The length  is typically small compared to the length of the adjacent
channel branches. Since storage for 9 items is provided and only 8 entries are
allowed per line, an extra blank line has to be provided for the ninth dummy
item.
 is typically small compared to the length of the adjacent
channel branches. Since storage for 9 items is provided and only 8 entries are
allowed per line, an extra blank line has to be provided for the ninth dummy
item. 
Notice that a discontinuous slope element generally has upstream channel elements attached
to it. Therefore, it is always mandatory to specify an upstream reference element.
Example files: channel6.
 
 
 
 
 
 
 
  
 Next: Discontinuous Opening
 Up: Fluid Section Types: Open
 Previous: Weir slope
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guido dhondt
2016-07-31