ERDC/CHL CHETN-IV-32
June 2001
placed within the barrier is submerged at one or both ends. This representation describes a levee
or jetty with large holes or drainage pipes through which flow can pass from one side to the
other. Flow can also pass over the top of these levees or jetties once the water surface overtops
the crest. Thus, the cross-barrier pipe flow can occur in combination with any cross-barrier flow
that overtops the barrier. This CHETN describes the basic methodologies implemented, the
input changes in the ADCIRC code, and two example cases.
METHODOLOGY FOR LEAKY INTERNAL-BARRIER BOUNDARIES: The best way to
accommodate large holes and openings in barriers, which permit a significant amount of cross-
barrier flow, is to add cross-barrier pipes to the existing internal-barrier boundaries based on
weirs. Modifications have been made in ADCIRC Version 40.02 and higher to allow the
specification of leaky internal-barrier boundaries that transmit flow through the barrier using
pipe formulae and over the top of the barrier using weir formulae. The new leaky-internal
barrier boundary is an addition to all the boundary condition types that were in place in earlier
versions of ADCIRC. All other boundary types are specified and handled as in previous versions
of ADCIRC. Six cross-barrier pipe configurations have been included and are described.
Configuration 1: Water Level on Both Sides of the Internal Barrier Below the
Height of the Crown of the Cross-Barrier Pipe
Water on both sides of the internal barrier is below the height of the crown of the cross-barrier
pipe (Figure 1). Thus
ζ L < h p and ζ R < hp
(1)
Figure 1. Water level on both sides of the barrier below the height
of the crown of the cross-barrier pipe
2
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