. Development of a portable sand trap for use in the nearshore. Littoral drift; Oceanographic instruments; Sedimentation and deposition. UNIFORM ^FLOW. Figure 36. Sketch for discussing the hypothetical disequilibrium of sand flux due to length of test section measurement has been rejected. In considering all possible reasons for the discrepancy between sand fluxes obtained with the basin sampler and C nozzle, it has been decided that the likeliest source of the incongruity is the pit sampler. In the following, sand-trapping efficiencies for the SUPERDUCK and DUCK85 nozzles have been calculated
. Development of a portable sand trap for use in the nearshore. Littoral drift; Oceanographic instruments; Sedimentation and deposition. UNIFORM ^FLOW. Figure 36. Sketch for discussing the hypothetical disequilibrium of sand flux due to length of test section measurement has been rejected. In considering all possible reasons for the discrepancy between sand fluxes obtained with the basin sampler and C nozzle, it has been decided that the likeliest source of the incongruity is the pit sampler. In the following, sand-trapping efficiencies for the SUPERDUCK and DUCK85 nozzles have been calculated using the C nozzle flux equal to the ambient sand transport flux. Sand-Trapping Efficiency Results 102. Tests conducted with midflow speeds greater than 60 cm/sec resulted in a flat-bed sand transport condition, which is most like the mode of transport occurring in the surf zone. Lower midflow speeds resulted in well-developed migrating ripples, which are not characteristic of the surf zone. All nozzles were fully tested in the 60 to 66 cm/sec range of midflow speeds. Therefore, for the purpose of determining nozzle sand-trapping efficiency, equations were developed to describe nozzle flux for the 60 to 66 cm/sec range of midflow speeds as follows: 74. 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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