长江口北槽洪季断面流速分布与泥沙输运特性

发布时间：2018-07-07 20:17

本文选题：水流特征 + 泥沙输运　；参考：《人民长江》2016年03期

【摘要】：为了解长江口北槽涉水工程对该区域水沙条件的影响,利用2009年8月北槽4个同步走航断面的水文泥沙资料,根据通量守恒原理,采用横向均匀、垂向时变的网格,经过时间插值、空间插值和投影的方法,将数据统一到计划断面,对北槽坡槽的水流结构分布特征及泥沙输运特性进行了分析。结果表明:北槽南、北边坡和深槽的涨落潮流速具有不同步的特征,南、北边坡先涨先落、深槽后涨后落,平流项输运和潮泵效应是北槽泥沙输运机制的主要影响项;北槽悬沙在深槽和南边坡向海输运,而在北边坡则是向岸输运,这种局部差异可能是北槽拐弯段北边坡淤积严重的重要原因之一。
[Abstract]:In order to understand the influence of the north channel wading engineering in the Yangtze Estuary on the water and sediment conditions in the region, the hydrological and sediment data of four synchronous navigation sections of the north channel in August 2009 are used. According to the principle of flux conservation, the horizontal uniform and vertical time-varying grids are adopted. By means of time interpolation, spatial interpolation and projection, the data are unified to the planning section, and the distribution characteristics of the flow structure and sediment transport characteristics of the north channel slope are analyzed. The results show that the fluctuating tidal current velocities of the north channel, the north slope and the deep trough are not synchronous. The south and north slopes rise and fall first, the deep trough rises and then falls, and the advection term transport and the tidal pump effect are the main factors affecting the sediment transport mechanism in the north channel. The suspended sediment in the north channel is transported to the sea in the deep trough and the south slope, while the sediment is transported to the shore in the north slope. This local difference may be one of the important reasons for the serious siltation of the north slope in the north channel bend section.
【作者单位】：华东师范大学河口海岸学国家重点实验室;黔南民族师范学院旅游与资源环境学院;上海市浦东新区防汛指挥中心;国家海洋局第二海洋研究所;
【基金】：国家自然科学基金项目(41376098)
【分类号】：TV148

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