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|Title:||Laboratory effects in beach studies, volume 7: movable-bed experiments with Ho/Lo = 0.013|
|Authors:||Chesnutt, Charles B.|
Stafford, Robert P.
Wave Height Variability
|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 v. 7.|
Abstract: In two experiments with a wave period of 2.35 seconds on an initial movable-bed slope of 0.10 in tanks 6 and 10 feet wide, significant differences in profile shape and wave height variability developed. Secondary wave and re-reflection effects resulting from the 38.3-foot difference in distance from the wave generator to the profile toe caused differences in the shape of the offshore zone. The 0.15-foot gap at the end of the generator blade in the 10-foot tank and the and the critical combination of wavelength and tank width generated a transverse wave. The transverse wave affected the profile shape-the shoreline became skewed, the depth over the shelf in the offshore zone increased laterally, and changes in the inshore zone progressed from one side of the tank to the other during the course of the experiment. The reflection coefficient, KR , varied from 0.03 to 0.14 in the 6-foot tank and the average in the 10-foot tank varied from 0.11 to 0.24, with considerable lateral variation. Changes in KR in the 10-foot tank correlate well with changes in the shape of the upper part of the offshore zone. The profile in the 6-foot tank reached equilibrium, while the profile in the 10-foot tank continued to change. Note: The reflection coefficient KR is not presented accurately in this online abstract due to character set limitations. The downloaded pdf will accurately present the coefficient.
|Appears in Collections:||Miscellaneous Report|