. Development of a portable sand trap for use in the nearshore. Littoral drift; Oceanographic instruments; Sedimentation and deposition. FLOW SPEED (cm/sec). 10 20 30 40 50 60 DISTANCE (WIDTH) ALONG TANK (cm) 70 DEPTH â~- Z â -Iâ Z â -*- Z - -B- Z â -*- Z ⢠Figure 12. Variation of flow speed with depth at test section B Streamer nozzles 36. Streamer trap nozzle parameters investigated in the hydraulic tests are illustrated in Figure 13: nozzle height and width (varied between by 15 cm and 25 by 20 cm); presence or absence of a hood (extending from to 5
. Development of a portable sand trap for use in the nearshore. Littoral drift; Oceanographic instruments; Sedimentation and deposition. FLOW SPEED (cm/sec). 10 20 30 40 50 60 DISTANCE (WIDTH) ALONG TANK (cm) 70 DEPTH â~- Z â -Iâ Z â -*- Z - -B- Z â -*- Z ⢠Figure 12. Variation of flow speed with depth at test section B Streamer nozzles 36. Streamer trap nozzle parameters investigated in the hydraulic tests are illustrated in Figure 13: nozzle height and width (varied between by 15 cm and 25 by 20 cm); presence or absence of a hood (extending from to cm forward of the element); presence or absence of a bottom lip (curved or straight); and streamer length (varied between and m). Dimensions of the streamer trap nozzles were chosen to be large enough to collect a signi- ficant (field measurable) quantity of sand during the testing period, yet small enough such that a rack with a vertical array of streamers would be of a size and weight that could be deployed during testing by one person. (See Part II for a general description of the streamer trap.) Bottom lips were tested on the lowermost streamers with the intention to streamline flow into the streamer and decrease scour (tested during the sand-trapping phase). Other components such as streamer mesh size (, , and mm) and a plexiglass door designed to shut during reversals in flow (as occurs in on- offshore sediment transport under oscillatory waves) were also evaluated. 26. 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 ; Springfi
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