Field experiments are conducted to determine wave energy transmission characteristics of San Pedro Breakwater, Los Angeles, California. Sea surface elevations are measured by means of Vibrotron Pres sure Transducers placed on the sea floor approximately 16 meters from the sea suHace. The wave sensors are placed at three locations with two sensors at each location. Two of the sensor sites are on the oceanside of the breakwater; one of them is on the harborside. Signals from the sensors are sent to a frequency division multiplexer located on top of the breakwater and then transmitted through an undersea cable (approximately 2 miles long) to the shore recording station at which the signals are separated, digitized, and recorded on a nine track digital tape recorder compatible with IBM 360 computer.Spectral analysis of the taped data is undertaken. The results show that the predominant wave energy centers on wave with period equal to 16 seconds. It also shows that approximately 50% of the incident wave amplitude is Reference and illustrations at end of paper. reflected by the breakwater and returns to the oceanside. For this wave period, the wave transmission coefficient is about 30% with the remainder of the wave energy dissipated within the breakwater. of Power Spectra" Dov er public ation~New York, N. Y. J ~T~. 7.17.4
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