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Title: Laboratory effects in beach studies, volume 2: movable-bed experiments with Ho/Lo = 0.021 (1970)
Authors: Chesnutt, Charles B.
Stafford, Robert P.
Keywords: Breakers
Coastal engineering
Model studies
Movable-bed experiments
Wave envelopes
Wave generators
Wave height variability
Wave reflection
Wave tanks
Publisher: Coastal Engineering Research Center (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous report (Coastal Engineering Research Center (U.S.)) ; no. 77-7.
Description: Miscellaneous Report
Abstract: Two movable-bed experiments were conducted in 6- and 10-foot-wide wave tanks for 175 and 210 hours, respectively, with a wave period of 1.90 seconds and generated wave height of 0. 36 foot. The reflection coefficient from the changing profile varied from 0.08 to 0.20 in the 6-foot tank and 0.04 to 0.19 in the 10-foot tank and the variations can be qualitatively related to changes in the profile shape. The profile in neither experiment attained an equilibrium shape, even though the shoreline position was stabilized by backshore renourishment. For approximately the first 50 hours (or before the shoreline stabilization), the shoreline recession rate in the 6-foot tank increased from 0.06 to 0.14 foot per hour coincidently with a 10 0 Celsius temperature drop. The shoreline erosion rate in the 10-foot tank was 0.08 foot per hour, and the temperature was between 25 and 30 degrees Celsius. The difference in recession rates between the two tanks is possibly due to differences in the distance from the generator to the initial shoreline (100 feet in the 6-foot tank and 61.7 feet in the 10-foot tank) or to temperature differences. Lateral variations occurred in the rate of development of the inshore zone in the 10-foot tank that did not occur in the 6-foot tank, indicating that the tank width may also have affected the profile development.
Rights: Approved for Public Release, Distribution is Unlimited
Appears in Collections:Miscellaneous Report

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