. DUCK85 surf zone sand transport experiment . Figure 5. Current meter mount with meter installed conditions, and current characteristics. An adjustable collar on the tripod holds the metal cylinder housing the meter electronics and preamplifier, allowing vertical adjustment of the current meter sensor. The flow meter sensor was placed 20-30 cm above the bed in all deployments. The horizontal axis of the current meter was aligned with its y-component parallel to the trend of the shoreline. The current meters sampled at 4 Hz and typically recorded for a nominal 30-min period which included the
. DUCK85 surf zone sand transport experiment . Figure 5. Current meter mount with meter installed conditions, and current characteristics. An adjustable collar on the tripod holds the metal cylinder housing the meter electronics and preamplifier, allowing vertical adjustment of the current meter sensor. The flow meter sensor was placed 20-30 cm above the bed in all deployments. The horizontal axis of the current meter was aligned with its y-component parallel to the trend of the shoreline. The current meters sampled at 4 Hz and typically recorded for a nominal 30-min period which included the sand-trapping run. Sand transport rate 21. The longshore sand transport rate was measured by means of portable traps such as shown in Figure 6. The sand collection element of the trap consisted of a metal frame or nozzle to which a cylindrical bag of flexible filter cloth called a "streamer" was attached. The polyester monofilament cloth allowed water to pass through but retained sediment of nominal diameter greater than the mesh, which encompasses sand in the fine grain size region and greater. The concept of the streamer-type trapping device for use in the nearshore was introduced by Katori (1982, 1983). Development of the trap has continued at CERC, including mounting of the streamers on various 17
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