. Development of a portable sand trap for use in the nearshore. Littoral drift; Oceanographic instruments; Sedimentation and deposition. Hydraulic Efficiency. 30 40 50 60 Flow Speed (cm/s) 70 80 Superduck Cube Duck85 Figure 20. Hydraulic efficiency with midflow speed nozzle had hydraulic efficiencies closest to unity for the uniform flow case; however, the C nozzle performed best for the bottom flow condition. Both the DUCK85 and SUPERDUCK nozzles had low hydraulic efficiencies for the lower flow speeds in Figure 19 (bottom flow condition). 51. The H-S sampler consistently had hydraulic effici
. Development of a portable sand trap for use in the nearshore. Littoral drift; Oceanographic instruments; Sedimentation and deposition. Hydraulic Efficiency. 30 40 50 60 Flow Speed (cm/s) 70 80 Superduck Cube Duck85 Figure 20. Hydraulic efficiency with midflow speed nozzle had hydraulic efficiencies closest to unity for the uniform flow case; however, the C nozzle performed best for the bottom flow condition. Both the DUCK85 and SUPERDUCK nozzles had low hydraulic efficiencies for the lower flow speeds in Figure 19 (bottom flow condition). 51. The H-S sampler consistently had hydraulic efficiencies greater than unity, with significant variations in flow speed at the nozzle at higher flow rates. The C nozzle had the highest average efficiency for the two- streamer tests, with the SUPERDUCK and DUCK85 nozzles having similar efficien- cies (Figure 20). 52. Table 3 presents a summary of the average hydraulic efficiency for each nozzle for each testing condition (on bed, off bed, and two streamers). The maximum standard deviation for a nozzle for a flow speed during a particular testing condition was chosen as a conservative representative value. These four nozzles, as well as selected other nozzles of special interest, were further examined in the sand-trapping test (Part IV). 40. 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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