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|Title:||Effect of bottom roughness on wind tide in shallow water|
|Authors:||University of California, Berkeley. Wave Research Laboratory|
United States. Army. Office of the Chief of Engineers
Tickner, Ernest Glenn.
|Publisher:||United States, Beach Erosion Board|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical memorandum (United States. Beach Erosion Board) ; no. 95.|
Abstract: Wind tide and wave conditions in shallow water were studied in a laboratory channel with a rough bottom. Common window screen arranged in strips, 0.10 foot in height, across the channel was used to simulate a vegetative roughness as often found in shallow lakes and bays. This roughness increased the set-up over a smooth bottom condition by a factor of about 2 when the water depth was slightly above the top of the roughness. When the water depth was half way up on the roughness strips, the set-up was 0.08 of that for the smooth bottom conditions with the same depth. The wave heights are not affected by the roughness if the ratio of the still-water depth to the roughness height is greater than 4, but when the ratio is less than 4, waves predicted by using the "effective depth" in the channel compare favorably with those predicted for a smooth bottom where the depth is equivalent to the effective depth.
|Rights:||Approved for Public Release, Distribution is Unlimited|
|Appears in Collections:||Technical Memorandum|