. Development of a portable sand trap for use in the nearshore. Littoral drift; Oceanographic instruments; Sedimentation and deposition. Figure A15. Pumping suspended sediment sampler (from Watts 1953) Samples were collected across the surf zone from a pier at Crystal Pier near San Diego, California; organic material tended to clog the nozzle and resulted in only 71 percent of the samples being used in data analysis. In addition, the sampler could only be deployed from a pier. Thornton (1972) combined a pump with bed-load sediment traps in the nearshore and surf zone at Fernandina Beach, Flori
. Development of a portable sand trap for use in the nearshore. Littoral drift; Oceanographic instruments; Sedimentation and deposition. Figure A15. Pumping suspended sediment sampler (from Watts 1953) Samples were collected across the surf zone from a pier at Crystal Pier near San Diego, California; organic material tended to clog the nozzle and resulted in only 71 percent of the samples being used in data analysis. In addition, the sampler could only be deployed from a pier. Thornton (1972) combined a pump with bed-load sediment traps in the nearshore and surf zone at Fernandina Beach, Florida. The traps sampled for 15 min, then doors on the bed-load traps were shut and the collected sediment pumped out for approximately 5 min. The bed-load traps tended to clog, however, and get buried in heavy wave conditions. Thornton estimated the efficiency of the system from 40 to 100 percent. Fairchild (1972) collected suspended sediment samples for approximately 3 minutes in the New Jersey surf zone and North Carolina nearshore zone using a tractor- mounted pump sampler. Crickmore and Aked (1975) made a series of point measurements above the bed in an estuary with fine sediment using a vertical array of nozzles feeding to a pump mounted on a boat; the sediment was filtered out of the mixture, while the cumulative water volume was recorded on a volumetric meter. Coakley et al. (1979) measured samples on-offshore and longshore using a A25. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Rosati, Julie Dean; Kraus, Nicholas C; U. S. Army Engineer Waterways Experiment Station; Coastal Engineering Research Center (U. S. ); United States. Army. Corps of Engineers. [Vicksburg, Miss. : U. S. Army Engineer Waterways Experiment Station ; Springfield, Va. : available from National Technical Information Service]
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