长江河口南、北港河道挟沙能力研究  

Sediment carrying capacities at the South and North Channels of the Changjiang River Estuary

作　　者：徐敏[1] 李九发[1] 李占海[1] 姚弘毅[1] 陈炜[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

出　　处：《海洋学研究》2012年第2期51-57,共7页Journal of Marine Sciences

基　　金：国家自然科学基金资助项目(50939003;51061130544)

摘　　要：近年来,随着长江流域来沙量的减少,河口水沙动力条件以及河床地形必将发生一定程度的变化。通过对长江口南、北港河道连续9 d小潮至大潮水沙定点观测发现,小潮期含沙量较低,但随着潮流速增强,大潮期含沙量较高,表明泥沙再悬浮明显。通过实测数据分别给出大、中、小潮南、北港河道挟沙力经验公式,显示出潮流与含沙量具有良好的相关性,同时显示出潮流流速与挟沙能力的方次变化有良好的对应性。In recent years, the hydrodynamics and riverbed topography of the Changjiang River Estuary is inevitably experiencing some new changes due to the decrease of the runoff and sediment load. Successive 9- days fixed point observations during neap-mean-spring tide show that the sediment content was relatively low for neap tide, increased with the increase of flow velocity and was higher for spring tide, which indicated evident sediment resuspension. Analysis of the observed data gave out empirical formula of sediment carrying capacity of neap, mean and spring tides for the South and North Channels of the Changjiang River Estuary, and showed good correlation between the sediment content and tidal current, and also good correspondence of their power changes.

关 键 词：长江河口 南 北港河道 潮流流速 含沙量 挟沙力 水沙变化 

分 类 号：TV143.4[水利工程—水力学及河流动力学]