ERDC/CHL CETN II-43
June 2000
transport. The required number of sampling locations depends on the site-specific conditions and
the beach profile. Figure 1 shows an example of cross-shore locations sampled during the
October 1997 extra-tropical storm studied as part of the STORM experiments.
OCT97
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Pier Station (ft)
Figure 1. Example cross-shore depth and sampling locations for the October 1997
STORM experiments (to convert feet to meters, multiply by 0.3048)
Spatial variation of transport processes occurs on a much smaller scale in the vertical direction.
Large vertical gradients in concentration, as shown in Figure 2, require closely spaced
measurements of concentration near the bed, with increasing instrument spacing higher in the
water column. Vertical distribution of instruments deployed during the STORM experiments is
illustrated in Figure 3.
Bed-load transport, which occurs near the sediment/water interface, is one of the most difficult to
identify and measure. The dynamics of this very thin layer of moving sediment are likely to be
significantly altered by the presence of instrumentation. In most cases, the SIS instrumentation is
located above the layer of bed-load movement, and consequently the estimates of transport
should be considered suspended load only.
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