Anmerkungen:
Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
Beschreibung:
Source: https://erdc-library.erdc.dren.mil/jspui/ ; A 1:75-scale undistorted hydraulic model of Kewalo Basin, Oahu, Hawaii, and sufficient offshore area to permit generation of the required test waves was used to develop and test several plans of improvement proposed to eliminate: (a.) crosscurrents in the entrance channel, (b.) the presence of peaking and breaking waves in the entrance channel, and (c.) undesirable wave action in the basin. Improvement plans consisted of a proposed wave absorber along the channel sides, various jetty plans, removal of the channel, and various combinations of the above. A 50-ft-long wave machine and an electrical wave height measuring and recording apparatus were used in the model. Tests were conducted with existing conditions installed and the results were compared with those for various improvement plans. It was concluded from the test results that : (1.) Strong wave- induced crosscurrents entered the existing harbor channel for several hundred feet seaward of the existing jetty; and for some wave conditions, crosscurrents entered both sides of the channel and an eddy was formed. (2.) Peaking and breaking waves occurred in the existing channel for incident wave heights of 8 ft or greater (at the wave generator located at a depth of -60 ft mllw) due to strong seaward-flowing currents and the channel shoal. (3.) Wave heights up to 3.4 ft were measured in the existing basin, but piers in the basin generally prevented the formation of well-developed standing waves . (4.) Addition of a wave absorber along the sides of the entrance channel (plan 2) was the most effective improvement plan in reducing wave heights in the basin (an average of about 13 percent and maximum wave heights were reduced from 3.4 to 1.9 ft), but this plan had little effect on current conditions. (5.) A 150-ft jetty extending due south from the end of the existing jetty with a +2.0-ft crown elevation (plan 3D) was the best of the 150- ft jetty plans tested. This plan increased wave heights in the basin slightly ...