SELECTION AND DESIGN OF A BORE GENERATOR FOR THE HILO HARBOR TSUNAMI MODEL: HYDRAULIC MODEL INVESTIGATION.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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Theoretical and experimental investigations were made of the generation of a bore by the three following types of bore generator a piston type, b gate type, and c pneumatic type. The analyses were based on nonlinear shallow-water theory incorporated with bore conditions. The experiments were conducted in a test flume 1 ft wide and 40 ft long. Explicit solutions were obtained for the height, duration, and length of bores generated by each type of generator. The bore heights found experimentally agreed very well with the theoretical predictions. A numerical computation of the pneumatic chamber theory was also performed and showed remarkable agreement with test results of the pneumatic-type bore generator. A uniform slope of 3 percent was installed in the test flume to investigate the bore motion over a uniform slope. The bore transformation was found to agree with Whithams approximate solution. The bore runup reached a height above still-water level 2.6 to 3.0 times greater than the initial height of the bore on the flat bottom. The breaking of the bore during its transformation was also studied. Due to its inexpensiveness and versatility, a pneumatic-type bore generator was recommended for use in the model of Hilo Harbor, Hawaii for investigation of tsunami-wave attack at Hilo. Author
- Physical and Dynamic Oceanography