季节性波浪动力作用下南湾弧形岸滩泥沙横向输运特征  

Characteristics of transverse sediment transport along Nanwan arc-shaped beach in response to seasonal wave dynamics

作　　者：戴志军[1] 陈建勇[1] 李春初[2] 王世俊[2] 路海亭[1] 

机构地区：[1]华东师范大学河口海岸学国家重点实验室,上海200062 [2]中山大学河口海岸研究所,广东广州510275

出　　处：《海洋工程》2007年第4期39-45,共7页The Ocean Engineering

基　　金：国家自然基金资助项目(40506021;40771200);广东省自然基金资助项目(011181)

摘　　要：响应季节性波候作用的泥沙输运特征是研究弧形海滩地貌变化及港工建筑的重要内容。基于南湾弧形海滩实际测量的冬、夏各11条剖面高程变化资料,将其划分为低潮间带、低中潮带、中潮带、高潮间带、低冲流带、中冲流带及其海滩后滨等7带,在此基础上利用经验正交函数(EOF)方法对各个带的体积变化进行分析,结果表明:1)南湾弧形海滩的泥沙以单向输运为主,并具有季节性变化特征,其中冬季泥沙在东南浪作用下,自陆向海输运,夏季泥沙在西南浪作用下自海向陆输运;2)南湾弧形海滩的泥沙分别在高潮带与中潮带、低冲流带与中冲流带之间存在频繁的双向输运;3)南湾弧形海滩不同岸段泥沙的横向输运因岬角的遮蔽能力、地形以及波浪作用的方向而有所差异。It is important,in the studies of geomorphological changes of beach and harbor engineering,to analyze the characteristics of sediment transport in response to the seasonal wave dynamics.Based on the measured height data along 11 beach profiles of the Nanwan arc-shaped coast in winter and summer,respectively,the beach was divided into seven sectors including upper beach,mid-swash zone,and lower swash zone,upper intertidal zone,mid-tidal zone,lower mid-tidal zone,and lower intertidal zone.The time series of the changed volumes of these sectors was analyzed by EOF.The results show that：（1） The single transverse sediment transport is a manly trend,with a seasonal variation characteristics for the Nanwan arc-shaped beach.The direction of sediment transport along each beach profile is from sea to land in summer with a response to the southwest wave,and from land to sea in winter with a response to the southeast wave.（2） Frequently bi-directional changes of sediment transport occur in between the high tidal zone and low tidal zone,and between the low swash zone and medium swash zone.（3） The transverse sediment transport varies at different segments of the Nanwan arc-shaped beach because of the shadow ability of the headland,topography and the direction of the wave action.

关 键 词：弧形海滩 横向泥沙输运 EOF分析 南湾海滩 

分 类 号：P737.1[天文地球—海洋地质]