单突堤后的波浪绕射

波浪绕射现象是确定港域掩护状况的主要因素,在设计港口防波堤工程时必须予以考虑,以便根据港口使用要求,选择最佳的外堤布置方案,确保船舶作业安全并节省工程投资。防波堤工程可有各种不同布局,其中最常见的一种为单突堤。其它如岛堤、双突堤,从计算堤内水域波况的观点着眼,在一定条件下其性质亦属于单突堤一类。因此,研究单突堤后的波浪绕射规律具有较普遍的实际意义。

WAVE DIFFRACTION AROUND A SEMI-INFINITE SINGLE BREAKWATER

Based upon regular wave experimental data and taking into consideration the boundary and continuity conditions which must be satisfied in wave diffraction,we obtained empirical formulas for computing diffraction coefficients of regular waves passing a semi-infinite single breakwater.From wave spectrum theory,principally taking into account the angular spectrum of irregular waves,we further derived analytical formulas to compute diffraction coefficients of irregular waves trarelling around a semi-infinite single breakwater.The calculated values of diffraction coefficients have been compared with measured data.Preliminary result of comparison indecated that generally they are in good agreement.The formulas proposed in this paper can thus be applied to the designing breakwatewaters.For the purpose of rapid computation of the approximate values of diffraction coefficients in the preliminary stage of design,a series of tables and diagrams have been prepared using the proposed formulas,Tables and diagrams can be used equivalently to each other.