Accession Number : AD0638197

Title :   SHIP WAVES.

Descriptive Note : Technical rept.

Corporate Author : HYDRAULIC ENGINEERING LAB UNIV OF CALIFORNIA BERKELEY

Personal Author(s) : Sorensen,Robert M.

Report Date : AUG 1966

Pagination or Media Count : 169

Abstract : The waves generated by a ship model (of general form) were investigated for a series of ship speeds that provided Froude numbers (based upon the water depth) of between 0.48 and 1.58, a range in which interesting and complex variations occur in the characteristics of the wave pattern. In addition to the use of normal photography and standard parallel wire resistance type wave gages, the wave patterns were measured over a 16 ft. square test area by stereophotogrammetric methods. With a few innovations, the stereo-analysis provided excellent data on the water surface elevations over the test area. The results of the model tests are presented, discussed, and compared with existing related theory. In addition, results of a quantitative study of the waves generated by five boats operating in the Oakland Estuary are presented and discussed. The time history of the water surface elevation was measured by a step-type wave gage for each boat while operating at a range of speeds and distances from the wave gage. Further, a study was conducted on surface gravity wave scale effects by towing five different length geometrically similar ship models at a series of equal depth Froude numbers to determine the extent of the effects of viscous and surface tension forces on the generated gravity waves. (Author)

Descriptors :   (*WATER WAVES, *SHIPS), SHIP MODELS, PHOTOGRAMMETRY, MODEL TESTS, SURFACE PROPERTIES, GRAVITY

Subject Categories : Marine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE