考虑绕射效应的沿堤波浪力波动分析  

Undulation analysis of wave force along breakwater considering wave diffraction

作　　者：蒋学炼[1,2] 马青山 李珊珊[1] 李炎保[4] 

机构地区：[1]天津城市建设学院天津市软土特性与工程环境重点实验室,天津300384 [2]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [3]中国港湾工程有限责任公司,北京100027 [4]天津大学建筑工程学院,天津300072

出　　处：《水利水运工程学报》2012年第5期1-7,共7页Hydro-Science and Engineering

基　　金：天津市自然科学基金(10JCYBJC03700);天津市高等学校科技发展基金(20080906);大连理工大学海岸和近海工程国家重点实验室开放基金(LP1104)

摘　　要：回顾了波浪绕射的理论基础,提出了等水深单突堤的总波浪力相位差修正公式,结合绕射效应解析解和波压计算方法,探讨了波高和波浪力的沿堤波动.分析结果表明,波高沿堤波动导致波浪力沿堤也呈正弦形式的周期性衰减,这正是蛇行破坏现象的内在原因.当不考虑堤后绕射波影响时,堤头附近水平波浪力最大峰值约为立波时的1.2倍,当考虑堤后绕射波影响时,最大峰值可达1.4倍以上.这表明立波系统只是一种总体平均情况,考虑到波浪力的沿堤波动,工程中应加强局部重点堤段的防护.The theory of wave diffraction is reviewed and the revised formulas of total wave force are deduced for the semi-infinite vertical breakwater with the same depth.And the undulation in wave height and wave force along a semi-infinite vertical breakwater is discussed by combining the wave diffraction model and the wave pressure formulas.The analysis results show that the undulation of wave height along breakwater produces a spatial variation with a sinusoidal form in the wave pressure exerted on the breakwater,which is just the intrinsic cause of the meandering damage.Without consideration of the diffracting waves behind the semi-infinite breakwater,the total wave force per unit length of structure can reach 1.2 times the standing wave force.However,with consideration of the diffracting waves behind the breakwater,the first peak of wave force shows an increase of more than 40% compared with that of the standing wave system.The fact indicates that the standing wave system commonly used in engineering is only a rule of averages and the spatial variation in total wave force should be taken into account carefully under construction in order to prevent the local trunks near the tip of breakwater from damage.

关 键 词：波浪绕射 相位差 波浪力 沿堤波动 

分 类 号：U656.2[交通运输工程—港口、海岸及近海工程]