. Development of a portable sand trap for use in the nearshore. Littoral drift; Oceanographic instruments; Sedimentation and deposition. Figure A12. Birkbeck bed-load sampler (from Reid, Layman, and Frostick 1980) consists of a wedge-shaped pan that can be inserted into the bed by divers during low to moderate flows. The sampler induces flow separation at the leading edge of the pan; a sieve-mesh screen contains sediment as flow exits the trap. The trap was installed in a section of the Ottawa River, Ottawa, Canada. Sediment transport rates inferred from use of the sampler were compared with t
. Development of a portable sand trap for use in the nearshore. Littoral drift; Oceanographic instruments; Sedimentation and deposition. Figure A12. Birkbeck bed-load sampler (from Reid, Layman, and Frostick 1980) consists of a wedge-shaped pan that can be inserted into the bed by divers during low to moderate flows. The sampler induces flow separation at the leading edge of the pan; a sieve-mesh screen contains sediment as flow exits the trap. The trap was installed in a section of the Ottawa River, Ottawa, Canada. Sediment transport rates inferred from use of the sampler were compared with the dune-tracking method of calculating sediment transport. Values compared well at two of three stations. The author contributes discrepancies at the other station to (a) the cyclic nature of sediment transport and the short sampling times inherent in this type of sampler, and (b) the non- angularity of dunes at that station, an assumption in the dune-tracking method. Laboratory experiments were con- ducted in two flumes. The first flume was exactly the width of the sampler and indicated that the trap had a sediment-trapping efficiency equal to or greater than The ambient rate of sediment transport was calculated using the weight of sediment in the tail water without the sampler in use. The width of the second flume was twice that of the sampler; therefore, for a sediment-trapping efficiency of , the weight of material caught by the sampler would equal the weight of material in the tail A18. 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. :
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