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The channel analysis and design evaluation tool ( CADET) is a numerical program to determine the optimum dredge depth for the offshore portions of entrance channels. A brief description of the theoretical basis and risk assessment in CADET is presented. Validation comparisons between CADET predictions and field measurements of wave-induced vertical motions at Ambrose Channel, New York, are presented. Prototype ship motions were measured with a differential global positioning system in April 1998 along three 488-m-long reaches. Comparisons were made with six ships, three tankers and three containerships, during inbound and outbound transits. In general, the CADET predictions matched the field measurements reasonably well, especially considering the wave heights were relatively small during the measurement period. [ABSTRACT FROM AUTHOR]

A three-dimensional, physical model study of wave diffraction around a semi-infinite breakwater was conducted using a directional spectral wave generator. Both regular and irregular waves with narrow and broad frequency and directional spreading were simulated. Surface elevations were measured in the lee of the breakwater, within a radius of three wavelengths of the tip. Comparisons with regular and irregular wave prediction methods indicate the strengths and limitations of the methods for various wave conditions, and the importance of directional spreading. Data are given to assist other investigators in testing numerical models. [ABSTRACT FROM AUTHOR]

Studies the distribution of waves behind shoals. Ratios calculated for wave-height; Importance of directional spread; How the Rayleigh distribution estimated large waves.