The rates of collision and stranding at sea are very high. The primary causes of stranding are: not checking a ship's position, inadequate route planning, operational misjudgement and inefficient watchkeeping. These causes are responsible for 90 percent of strandings according to accident statistics. Reduction in stranding risk would be of considerable economic benefit and would also reduce pollution and be welcomed by shipping companies and, of course, by crews.
For 亡he ship port , it is one of the most 三 mportant purpose to prevent the wave penetration . Energy attenuation of penetrating waves in the port is very influenced by the arrange 皿 ent of breakwaters , There are many constituents for the transfomlation of wave property in the port . We must consider the many ph6nomena for the calcu 正 ation of waves , which are the diffraction , the r α[ 1ection, the refraction , the bottom friction , the shallow water effect and the water breaking . For the regular waves , each phenomena has been analyzcd theoretically and experimen 七ally , and cemparison of theory and reality has rnet with gQod results . The ir エegular penetrating wave which has a directionaL spe ( 比rum is n 〕ade up of many cQmpcneut waves , each of which has a eertain frequency and direction . If we suppQse , therefor , that each co ; nponent waves has a general property of regular waves , we cqn take advantage of above results .
The prop6rty Qf wind turbu ! ence on ti皿 e history and it ' s effect on ship ・ s motion have been reported at part I last year . In this paper , the space distribut 量 ons of wind turbulence which are obserbed at open sea and experimen ・ ted at laboratory , and the nu 皿 erically si皿 ulated ship ' s motions accQrding to that wind turbulen (re are desc− ribed.
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