流域减沙对长江口典型河槽及邻近海域演变的影响

发布时间：2018-05-20 19:02

本文选题：输沙量 + 冲淤演变　；参考：《水科学进展》2017年02期

【摘要】：基于2001—2015年长江口系列的水下地形和水文测验等资料,研究了流域减沙对长江口典型河槽及邻近海域演变的影响。结果表明:三峡工程建成后的近10多年,流域年均输沙量处于1.35亿t左右的较低水平。受其影响,长江口口内的南支、南港和北港上段的含沙量2008年之后明显下降,河槽冲刷、容积扩大,河槽形态向相对窄深方向演化。而拦门沙河槽的上游侧和口外侧近年来亦有所冲刷,拦门沙浅滩长度缩短。长江口水下三角洲前沿位于北港口外和南北槽口外有两个冲刷区,2007年之后年平均冲刷厚度达0.1 m左右,年侵蚀沙量达0.71亿m3。流域减沙对长江口河槽演变的影响尚在进行中,可能改变长江口水下三角洲向海淤涨的历史演变模式。
[Abstract]:Based on the underwater topographic and hydrological data of the Yangtze Estuary series from 2001 to 2015, the effects of sediment reduction on the evolution of typical Yangtze Estuary channels and adjacent waters are studied. The results show that after the completion of the three Gorges Project for more than 10 years, the average annual sediment discharge in the basin is at a low level of about 135 million tons. Due to its influence, the sediment content in the south branch, the south port and the upper section of the north port in the Changjiang Estuary decreased obviously after 2008, the channel scoured, the volume expanded, and the shape of the channel evolved towards the relatively narrow and deep direction. In recent years, the upstream side and the outer side of the channel have also been scoured, and the length of the shoal is shortened. The Changjiang Estuary underwater delta front is located outside the north port and the north and south trough, there are two scour areas, the average annual erosion thickness is about 0. 1 m after 2007, and the annual erosion sediment amount is 71 million m3. The influence of sediment reduction on the evolution of Yangtze Estuary channel is still in progress, which may change the historical evolution model of underwater delta siltation in the Changjiang Estuary.
【作者单位】：上海河口海岸科学研究中心;
【基金】：国家自然科学基金资助项目(41506108) 国家重点研发计划资助项目(2016YFC0402107)~~
【分类号】：P343.5;P737.1

【相似文献】