Development of a Portable Sand Trap for Use in the Nearshore
Abstract
This study presents an evaluation of and improvement upon the hydraulic and sand trapping characteristics of the streamer trap, a sand trap developed for use in the nearshore zone. Twenty-three streamer trap nozzles were evaluated in laboratory hydraulic efficiency tests; three nozzles with near- optimum hydraulic behavior were further evaluated in laboratory sand-trapping efficiency tests. A comparison of measurements made with two closely spaced traps in the field was conducted as an indication of consistency. The Helley- Smith sampler, a popular riverine sediment trap reported in the literature, was also tested in the laboratory for comparison. Laboratory testing indicated that the nozzle previously used in the DUCK85 field data collection project performed well at an off-bed elevation; however, sand-trapping efficiency at the bed was low, with significant scour developing during a 5-min testing period. The SUPERDUCK nozzle, previously used in the SUPERDUCK field data collection project, performed near optimally at an off-bed elevation in the laboratory. When the nozzle was positioned at the bed, scour occurred at the base over approximately half the testing period. A new cube-shaped nozzle design performed near optimally at both off- and on-bed elevations in the laboratory. Keywords: Apparatus; Helley-Smith sampler; Laboratory experiment; Longshore transport; Riverine transport; Sand trap; Sediment trap; Sediment transport; Transport rate.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1989
- Accession Number
- ADA213534
Entities
People
- Julie Dean Rosati
- Nicholas C. Kraus
Organizations
- Coastal Engineering Research Center