20
% on side rubber seal
18
% on updrift end rubber seal
16
14
12
10
8
6
4
2
0
Trap Center Locations (m from shoreline)
Figure 91. Weight of sand that accumulated on the rubber seals around the
traps
0.15
0.10
0.05
0.00
-0.05
-0.10
-0.15
-0.20
-0.25
Alongshore Location (m)
Figure 92. Volume change computed for each profile
Within each 0.75-m cross-shore section of beach in this anomalous zone
(0.75 m is the width of each flow channel), the measured trap volume for that
channel is adjusted to reflect the anomalous volume change within that section of
beach. Trap weights are converted to volume by considering the porosity of wet
sand that accumulates in the traps (porosity of 0.40 is assumed). Generally,
volume changes between the downdrift boundary and the alongshore coordinate
148
Chapter 10
Longshore Sediment Transport Experiments
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