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Title: Correlating seabed drifter weights to sand threshold conditions in wave and wave/current environments
Authors: O.H. Hinsdale Wave Research Laboratory.
Dredging Research Program (U.S.)
Hands, Edward B.
Sollitt, Charles K.
Keywords: Bed forms
Nearbed hydrodynamics
Seabed drifters
Bottom currents
Fate of open-water
Onshore transport
Threshold velocity
Critical velocities sediments
Dredged material uses
Motion initiation
Wave tank study
Publisher: Coastal Engineering Research Center (U.S.)
Engineer Research and Development Center (U.S.)
Description: Technical Report
Abstract: The purpose of this study was to investigate the response of seabed drifters (SBD's) to combined waves and currents and, specifically, to examine the feasibility of modifying these bottom current drogues to behave more like sediment particles. This is the only known full-scale, quantitative study of the response of SBD's to wave and current forces. Standard design SBD's were modified by changing the attached weight so that the SBD's would move on the seafloor only when the flow conditions were sufficiently vigorous to initiate sediment motion. Relative drag and inertia coefficients for SBD's were evaluated and related to the Reynolds numbers and the Keulegan-Carpenter parameter. Using these relationships, a methodology was derived for selecting threshold SBD weightings appropriate for different situations. The SBD's used in these tests were identical to those used in recently reported studies conducted by the U.S. Army Corps of Engineers at Duck, NC, Sand Island, AL, and Humboldt, CA.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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