Accession Number : AD0726960

Title :   Mechanics of Sediment Suspension Due to Oscillatory Water Waves.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV BERKELEY HYDRAULIC ENGINEERING LAB

Personal Author(s) : Das,Madan M.

Report Date : JUN 1971

Pagination or Media Count : 30

Abstract : Turbulent boundary layer flow simulating the bottom motion due to oscillatory water waves was produced in a swing flume whose shape is a segment of a circle having about a 9-foot radius and 13-foot chord length. The flume, freely suspended from the ceiling of the laboratory, can be oscillated by a driving mechanism. The suspension of white plastic particles (0.589 mm < d < 0.701 mm) having a specific gravity of 1.13 and an average still water fall velocity of 1.25 cm per sec was studied in this flume over a bed of artificial ripples of 16 mm height and 28 mm wave length with a water depth of one foot at the midsection of the flume. In the experiments, the semi-amplitude and period of oscillation and bottom velocity were varied from 0.5 to 1 foot, 2.35 to 5.88 secs, and 0.73 to 1.90 ft. per sec respectively. An optical meter, developed for the in situ measurement of suspended particle concentration, was successfully calibrated in the concentration range of 125 to 2000 ppm using the particles tested and was found to be suitable for measurement of mean concentration. (Author)

Descriptors :   (*WATER WAVES, SEDIMENTATION), (*OCEAN WAVES, BEACHES), TURBULENT BOUNDARY LAYER, TURBULENCE, OSCILLATION, VELOCITY, PARTICLES, VOLUME, HYDRAULIC MODELS, OPTICAL PROPERTIES, SIMULATION

Subject Categories : Physical and Dynamic Oceanography
      Hydrology, Limnology and Potamology
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE