双层开孔板沉箱防波堤的水动力学特征的非线性分析  

Nonlinear analysis of hydrodynamic behavior for a double-layer perforated-wall caisson breakwater

作　　者：朱大同[1,2] 

机构地区：[1]东南大学工程力学江苏省重点实验室,南京210096 [2]南京水利科学研究院海岸与河流所,南京210024

出　　处：《船舶力学》2013年第1期63-74,共12页Journal of Ship Mechanics

摘　　要：用作者发展的水波阻抗分析法,研究有两块开孔板和两个消浪室的双层开孔板沉箱防波堤的水动力学非线性特征。得到一组所有参数都是可计算的、形式上是个代数显式的严格理论公式。详细分析防波堤的波浪反射系数与各种参数如面板开孔率、开孔板的间距、沉箱相对宽度和相对水深等的关系。计算结果表明,如果开孔板的开孔率、消浪室的宽度与水文参数组合得当(匹配),可以有效地降低反射系数,拓宽消波频带宽度和扩大双层开孔板沉箱防波堤的适用范围。反之,波阻抗失配,其作用与一块开孔板的沉箱相同。理论计算与现有学者的试验成果做了对比。Using the water wave Impedance Analytical Method, this paper investigates plane regular wave interaction with a double-layer perforated-wall caisson breakwater that consisted of two perforated-walls, two chambers and a rigid impermeable back wall.The non-linear boundary conditions at the perforated walls were a prime focus in the study;Energy dissipation at the perforated wall occurred through the flow resistance to the fluid across the perforated wall.Explicit algebraic expressions are obtained for reflection coefficients. In the formulae, all of the parameters are known a priori. The variations of the reflection coef- ficients with the porosity, relative width of the chamber and relative water depth are carefully discussed.The results show that if the porosities of perforated-walls,relative width of the chambers and hydraulic parame- ters are effectually combined, the porosity of first wall must be big than that of second wall especially, the reflection coefficients of double-layer perforated-wall breakwater are lower than one of single-layer perfo- rated-wall breakwater; the applied range of double-layer perforated-wall breakwater is obviously extended. On the contrary, the reflection coefficients of double-layer perforated-wall breakwater are same as one of single-layer perforated-wall breakwater. The predicted reflection coefficients are compared with the exper- imental data of other researchers.

关 键 词：平面波 双层开孔板 防波堤 波浪反射 非线性流阻 阻抗分析法 

分 类 号：P752.1[天文地球—海洋科学]