Wind effects on runup and overtopping of coastal structures /
The effects of strong onshore winds on the maximum icrofilm Inc. elevation to which a wave will run up on a coastal revetment, or the rate at which water flows past the crest of the revetment if the crest is not high enough to prevent overtopping, were studied in a series of physical model tests in...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1998.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=733061991&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | The effects of strong onshore winds on the maximum icrofilm Inc. elevation to which a wave will run up on a coastal revetment, or the rate at which water flows past the crest of the revetment if the crest is not high enough to prevent overtopping, were studied in a series of physical model tests in a wind/wave flume. Runup elevations and overtopping rates were determined for both smooth and rough slope surfaces with slopes of l :1 .5, l :3, and 1:5, using a range of structure freeboots, incident wave conditions, and wind speeds. The study demonstrated that elevation of maximum sunup or overtopping rate increased significantly under the influence of wind speeds of 12 m/s and 16 m/s for similar wave conditions at the revetment toe. A11 measurements of sunup elevations or structure freeboards were adjusted for wind-induced setup in the wave flume. Sources of energy input to the wave sunup were examined. Tangential sheer stresses on the sunup bore were calculated and found to be negligible. Normal stresses affecting wave growth scorecard of the wave gauge used to measure incident wave conditions were calculated and found to have only a small effect on sunup elevations. Increases in surface velocity due to wind-induced wave breaking appeared to be the major cause of the observed increases in sunup elevations under the influence of strong onshore winds. Increases in surface current velocities were evidenced by higher velocities of the sunup bore under the influence of wind. No known scaling laws exist to apply model test results of wind effects on a gravity wave system directly to the prototype. Methods are discussed for separately calculating wind effects in the flume that do not scale to the prototype directly with the waves. Correction factors for applying smooth-slope sunup equations to rough surfaces are examined. It is shown that correction factors should not be constant values but should vary with incident wave conditions and structure slope. Recommendations are made for improved roughness correction factors. |
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| Item Description: | Vita. "Major Subject: Ocean Engineering". |
| Physical Description: | xv, 214 leaves : illustrations ; 28 cm. |
| Bibliography: | Includes bibliographical references (leaves 176-181). |