鸭绿江河口地区沉积物特征及悬沙输送  

Sediment Distribution and Suspended Sediment Transport in Yalu River Estuary

作　　者：高建华[1] 高抒[1] 董礼先[2] 张经[3] 

机构地区：[1]南京大学海岸与海岛开发教育部重点实验室,江苏南京210093 [2]国家海洋局第二海洋研究所,浙江杭州310012 [3]青岛海洋大学化学化工学院,山东青岛266003

出　　处：《海洋通报》2003年第5期26-33,共8页Marine Science Bulletin

基　　金：国家杰出青年科学基金(编号 49875612);国家自然科学基金项目(编号 49376278)资助

摘　　要：根据鸭绿江河口区 4 个站位的潮周期测量数据和 3 个柱状样的粒度数据，对悬沙的输送规律以及口门地区最大浑浊带的形成机制、悬沙输送方向以及物质来源和动力条件进行了分析。计算分析表明，鸭绿江是一条落潮流占优势的河流，平均流作用、斯托克斯漂移效应以及水深与悬沙浓度的潮变化引起的悬沙输送是其河口区最主要的悬沙输送机制。3 个柱状样粒度参数自东向西的变化反映了鸭绿江口西侧沿岸地区动力条件和沉积环境的变化：沉积物的平均粒径变小，分选变差，并且更正偏，物源的多元化特征逐渐增强。物源和河口区沿岸沉积动力环境的差异以及潮相的周期变化使 3 个柱状样中的环境敏感粒度组分对应着不同的粒径分布区间。Tidal cycle measurements of tidal currents and suspended sediment concentrations were undertaken at two stations in both 1994 and 1996, together with the short core collection within the Yalu River estuary. Analysis of the data sets obtained shows that the suspended load transport here is dominated by advection, Stokes drift and diffusion induced by tidal variations in water depth and suspended sediment concentration.Grain size analysis of the three short cores indicates that: ( 1 ) Along the shoreline to the west of the estuary, the sediment becomes finer, poorly sorted and positively skewed from the river mouth towards the west; ( 2 ) The material from the river mouth is maily derived from the Yaly River, but the material in the west shows a multi-source nature; And ( 3 ) the environmentally sensitive constituents of the three cores vary, in response to different hydrodynamic and sediment supply patterns.

关 键 词：悬沙输送 粒度参数 最大浑浊带 输运机制 鸭绿江 

分 类 号：P343.5[天文地球—水文科学]