Author(s): Martin N. R. Jaeggi
Linked Author(s):
Keywords: Bridges; Sediment transport; Pressure flow
Abstract: Pressure flow may occur at bridges, because the bridge cannot be raised above a certain level or because during extreme floods design flood levels are exceeded. A calculation procedure is presented, to assess sediment transport capacity in the bridge section. As in open channel flow, grain friction slope has to be taken as the dominant parameter. A wall drag procedure must be used in the bridge section, in which friction of the ceiling is also considered. By varying the local bed level under the bridge the solution is found by iteration. If pressure flow is considered for a bridge, special attention has to be given to the problem of floating debris.
Year: 2007