长江口南港南槽航道是长江口主要出海航道,航道出口处有铜沙浅滩形成拦门沙,是航道的主要障碍,使进出长江口的船舶吃水受到限制。为确保万吨海轮畅通,1975年在铜沙航道进行疏浚工程,挖槽长达28公里,航道水深从6米浚深至7米,从而提高 The south channel of the south port of the Yangtze River Estuary is the main channel of the Changjiang River estuary. The outlet of the channel has a sand barricade at the Shasha Shall, which is the main obstacle of the waterway, limiting the draft of ships entering or exiting the Yangtze Estuary. In order to ensure the smooth flow of 10,000 tons of seagoing vessels, dredging works were carried out at the Tongsha Waterway in 1975, with the trenching of up to 28 kilometers and waterway depth of 6 meters deepened to 7 meters, thereby enhancing