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一、工作概况长江全长6300km,是我国第一大河,长江口自徐六泾以下平面呈喇叭型,徐六泾江面宽度5.8km,苏北启东咀和上海南汇咀之间江面宽达90km,崇明岛将长江口分为南、北二支;长兴岛和横沙岛又将南支分为南、北二港;九段沙将南港分为南、北二槽。长江口呈三级分汊,四口入海之势。目前南港～北槽航道为万吨以上船舶进出长江口的航道,依靠疏浚维护7.0m水深;北港和南港～南槽为5.5～6.0m的自然水深航道;北支由于淤积消亡之势日趋严重,已无通航大轮的条件。
First, the work profile The Yangtze River total length of 6300km, is China’s largest river, the Yangtze River estuary from the Xu Hurjing following trumpet flats, Xu River surface width of 5.8km, North Jiangsu Qidong Tsui and Shanghai Nanhui Tsui River surface width of 90km , Chongming Island will be divided into south and north of the Yangtze River estuary two; Changxing Island and Hengsha Island South Branch will be divided into South and North Hong Kong; Jiuduansha South Port will be divided into two southern and northern trough. The Yangtze Estuary was divided into three levels, four into the sea potential. At present, the channel from Nangang to the north channel is the waterway of more than 10,000 tons entering and leaving the Yangtze River estuary, maintaining a water depth of 7.0m by dredging; the natural waterway of 5.5-6.0m in Beigang and Nangang ~ Nanguang channels is becoming serious; No navigable wheel conditions.