CAJ | 학술논문

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。
근거1958～2009년장강구북지수하지형실측수거,기우GIS기술진행계산분석,결과표명：장강구북지수도추우위축어천,기발전특정표현재하도관도축착、수심변천、수역면적감소이급하조용적축소;기구동원인위1955년좌우적자연하세조정이급궤십년래연안인공위은공정;북지위축어천조성료수도소망가속、수사도관풍험가대。의응채취수갑건패등수리설시,충분이용북지수도적개치,감소기부면풍험。
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.