Accession Number : AD0459520

Title :   DYNAMIC PROPERTIES OF IMMERSED SAND AT VIRGINIA BEACH, VIRGINIA.

Descriptive Note : Technical memo.,

Corporate Author : VIRGINIA INST OF MARINE SCIENCE GLOUCESTER POINT

Personal Author(s) : Harrison, Wyman ; Morales-Alamo, Reinaldo

Report Date : DEC 1964

Pagination or Media Count : 52

Abstract : On March 25, 1963, 219 sand samples were taken from the shoaling-wave, breaking-wave, swashbackwash, and foreshore zones of the beach. The following measurements were used to describe the properties of the samples: mean settling velocity in nature (as determined with a Woods Hole Rapid Sand Analyzer and a special set of curves for settling velocity as a function of temperature), mean Reynolds number (in nature), and mean drag coefficient (for an infinite fluid under natural conditions). Corey's (1949) shape factor and the Dynamic Shape Factor of Briggs, et al. (1962) were calculated and compared; the Corey shape factor was used in calculating mean settling velocity. Data for mean and median grain size (in nominal diameter) and sorting for each sample are presented. For the natural seawater conditions average Reynolds numbers for the various zones were 4.8 (shoaling-wave), 8.1 (breaking-wave), 6.2 (swash-backwash) and 12.0 (swash-berm). The important effect of kinematic viscosity on the dynamic properties of the particles and on beach slopes in the shoaling wave zone is considered. Observed trends of mean size and sorting throughout the dynamic zones compare poorly with those predicted by Miller and Zeigler's (1958) model. (Author)

Descriptors :   (*SAND, SEDIMENTATION), (*BEACHES, SAND), (*SEDIMENTATION, SAND), SAMPLING, PARTICLE SIZE, VISCOSITY, TIME, TEMPERATURE, SEA WATER, DRAG, REYNOLDS NUMBER, VELOCITY, MATHEMATICAL ANALYSIS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE