| 长江口北支水道萎缩淤浅分析 |
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| 作者姓名： | 刘曦 杨丽君 徐俊杰 陈勇 恽才兴 |
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| 作者单位： | [1]上海市地质调查研究院,上海200072 [2]华东师范大学河口海岸学国家重点实验室,上海200062 |
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| 摘 要： | 根据1958～2009年长江口北支水下地形实测数据,基于GIS技术进行计算分析,结果表明：长江口北支水道趋于萎缩淤浅,其发展特征表现在河道宽度缩窄、水深变浅、水域面积减少以及河槽容积缩小;其驱动原因为1955年左右的自然河势调整以及几十年来沿岸人工围垦工程;北支萎缩淤浅造成了水道消亡加速、水沙倒灌风险加大。拟应采取修闸建坝等水利设施,充分利用北支水道的价值,减小其负面风险。
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| 关 键 词： | 长江口北支 冲淤演变 GIS |
The Evolution of the North Branch of Yangtze River Estuary Characterized by Being Narrower and Shallower |
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| Authors: | LIU Xi YANG Li-Jun XU Jun-Jie CHEN Yong YUN Cai-Xing |
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| Institution: | 1.Shanghai Institute of Geological Survey,Shanghai 200072,China;2.State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200062,China) |
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| Abstract: | The evolution of the North Branch Channel of the Yangtze River Estuary from 1958 to 2009 year has been analyzed in great detail based on GIS technology and underwater survey data.The result showed that the north branch of Yangtze River estuary waterways tend to be narrower and be shallower,and its development characterized by narrowing the channel width,shallower depth,water area reduced and smaller channel volume.The natural reason of this trend is the river adjustment on 1955 to 1958,and the artificial reason is the land reclamation projection along the river.This trend increases the risk of saltwater and sediment intrusion to the South Branch of Yangtze river and other negative effects.In this regard,it is recommended to build dams,water gates and other water conservancy facilities,to full use of the value of the North Branch of waterways,and to reduce the downside risks. |
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| Keywords: | the North Branch of the Yangtze River Estuary erosion and deposit geographic information system |
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