二维悬沙长期输运速度的定义和机理分析  

Definition and mechanism analysis of two-dimensional long-period transport velocity of suspended sediment

作　　者：张文静[1] 朱首贤[1] 沙文钰[1] 

机构地区：[1]解放军理工大学气象学院,江苏南京211101

出　　处：《海洋工程》2003年第3期56-61,82,共7页The Ocean Engineering

基　　金：国家973计划资助项目(G1999043803);LOPSO开放课题;河口海岸国家重点实验室开放课题和总装"十五"预研课题

摘　　要：将悬沙和水体的长期输运分离研究,给出二维悬沙长期输运速度的定义。从理论上分析了各种物理过程对二维悬沙长期输运速度的影响机理。采用部分观测资料,对长江口二维悬沙长期输运速度及其机理作了初步的计算分析,结果表明:在最大浑浊带,悬沙和水体长期输运有明显的差别;在描述悬沙长期输运时,二维悬沙长期输运速度比二维水体长期输运速度更合理;潮泵作用和垂向切变作用是造成两者差别的主要原因。In this paper, a separated study on the longperiod transport of suspended sediment and on that of water is presented. At first the definition of twodimensional longperiod transport velocity of suspended sediment is given, and a variety of physical course impacts on it is analyzed theoretically. Then by using part of observational data, the new physical quantity in the Yangtze Estuary and the transport mechanism of suspended sediment is preliminarily analyzed. Results indicate that, in Turbidity Maximum, there are evident distinctions between transport of suspended sediment and that of water. To describe the characteristics of suspended sediment′s transport, the twodimensional longperiod transport velocity of suspended sediment is much more reasonable than the twodimensional longperiod transport velocity of water. Tidal pumping and vertical shearing are the principal factors leading to distinctions.

关 键 词：二维悬沙长期输运速度 二维水体长期输运速度 机理分析 长江口 

分 类 号：P713[天文地球—海洋科学]