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长江是我国第一大河,长达6300公里,多年平均入海年迳流量9240亿立米,输出泥沙4.86亿吨。自安徽大通起,长江开始受潮汐影响;从治理角度言,可将徐六泾以下作为河口段(图1)。徐六泾以下河口展宽,其断面宽度为5公里,七丫口断面宽14公里(其中南支宽9.4公里,北支4.6公里),鸭窝沙断面宽26.4公里(其中南港7.2公里,北港8.8公里,北支10.4公里),口门——北岸的寅阳角至南岸的南汇嘴,其宽度90公里。
The Yangtze River is the largest river in our country with a length of 6,300 kilometers. Its annual average flow into the sea is 942 billion cubic meters with an output of 486 million tons of sediment. Starting from Anhui Datong, the Yangtze River began to be affected by tides; from the governance perspective, the following can be used as the mouth of Xu Liujing estuary (Figure 1). The following river mouth of Xu Liujing is widened with a section width of 5 kilometers and a cross section of 7 mouths of 14 kilometers wide (the south branch width is 9.4 kilometers and the northern branch is 4.6 kilometers). The section of Yaosusha is 26.4 kilometers wide (including Nankang 7.2 kilometers and North Harbor 8.8 Km, North Branch 10.4 km), the door - the north shore of Yin Yang Kok Nanhui mouth to the south bank, the width of 90 km.