ERDC/CHL CHETN-IV-32
June 2001
cross-barrier pipes. The barrier lies entirely within the computational
domain. Normal-flow computations for both the weir and pipe component
flows are based on water elevations on both sides of the barrier.
If any leaky internal-barrier normal-flow boundaries are designated in the unit 14 input file
(IBTYPE = 5 and/or 25), the following information is required for each leaky barrier node pair
that defines the leaky internal-barrier boundary segment.
NBVV(K,I), IBCONN(I), BARINHT(I), BARINCFSB(I), BARINCFSP(I), PIPEHT(I),
PIPECOEF(I), PIPEDIAM(I) for the I=1,NVELL(K) node pairs in the leaky internal-
barrier boundary segment K.
NBVV(K,I) = front-face node for the leaky internal-barrier boundary
IBCONN(I) = the paired back-face node for the leaky internal-barrier boundary
BARINHT(I) = hib = the height of the leaky internal barrier above the geoid
(positive above the geoid and negative below the geoid),
BARINCFSP(I) = the coefficient of supercritical free surface flow (typical value
= 1.0) at the leaky internal-barrier boundary node pair. This
coefficient is applied if the cross-barrier flow is supercritical.
BARINCFSB(I) = the coefficient of subcritical free-surface flow (typical value
= 1.0) at the leaky internal-barrier boundary node pair. This
coefficient is applied if the cross-barrier flow is subcritical.
PIPEHT(I) = hp = cross-barrier pipe crown elevation above the geoid (positive
above the geoid and negative below the geoid) at the specific boundary
node pair. PIPEHT(I) must exceed the input bathymetric values
specified at the associated global node and at the paired node.
Accounting for sign conventions for bathymetry and cross-barrier pipe
crown height, we must satisfy the conditions:
PIPEHT(I).GE.-DP(NBVV(K,I)) and
PIPEHT(I).GE.-DP(IBCONN(I)).
If these conditions are not satisfied, the code will stop.
barrier with cross-barrier pipe boundary node pair. This bulk friction
factor is defined as:
fL
PIPECOEF =
D
where
f = Classical pipe friction coefficient
L = Length of pipe through the barrier (in consistent units).
D = Diameter of the cross-barrier pipe (in consistent units).
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