100
average
16m
20m
24m
30m
10
1
0.1
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
Elevation above bed (m)
10
average
16m
20m
24m
30m
1
0.1
0.01
0.001
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
Elevation above bed (m)
Figure 90. Alongshore variation in time-averaged mean sediment concentration
for the plunging-breaker case (top panel shows results from the
incipient breaker zone; bottom panel shows results from the midsurf
zone)
Performance of the Sand Traps
Several issues related to trap effectiveness were raised and discussed in
Chapter 8: The quantity of sand that remains suspended in the water column and
is transported past the traps, accumulation of sand on the rubber neoprene seals
around the periphery of each trap (both sides and the updrift edge), and
corrections to the trapped quantities that must be made as a result of anomalous
beach responses adjacent to the downdrift boundary. These sources of error must
146
Chapter 10
Longshore Sediment Transport Experiments
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