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珠江入海八大口门中,以磨刀门宣泄洪流量为最大,约占珠江干流西江马口站泄洪量的三分之一,输沙量的五分之一。由于河口淤积延伸。拦门沙发育,心洲、潜沙连迭,泄流能力降低,洪涝趋向恶化,影响农田排灌,和桂、粤通向澳门、香港的洪湾水道,要靠疏浚才能维持300吨航深;口外海滩每年以120～150米速度向外
The Pearl River into the sea eight gates, to Sabotundo discharge of floods to the largest, accounting for about a third of the Pearl River mainstream Xikang Meikou flood discharge, one-fifth of the amount of sediment. As the estuary siltation extension. The development of barges and sandstorms, heart island, submerged sand, reduced drainage capacity, deteriorating floods, affecting farmland irrigation and drainage, and Hong Kong and Macao leading to Macao and Hong Kong rely on dredging to maintain 300-ton space flight; Mouth beaches every year 120 to 150 meters out of speed