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磨刀门是西江的主要出海口。在广东省珠海市西偏南约25公里。西江流域上游每年平均以8836万吨泥沙及其他悬浮物被输送到珠江三角洲,且有80%在磨刀门、崖门、鸡啼门和横门等附近沉积下来。磨刀门每年约以100米的速度向海洋推移。这是围海造田的客观基础。珠江磨刀门开发综合有限公司等四单位,合股投资于1983年开始在磨刀门西江主流东西两隅围海造田。到1987年已成功围垦4.8万亩,主要投入农业种植和水产养殖业。
Grinding knife gate is the main estuary of the Xijiang. 25 kilometers west of Zhuhai City, Guangdong Province, about 25 km. An average of 88.36 million tons of sediment and other suspended solids are transported to the upper reaches of the Xijiang River every year and transported to the Pearl River Delta with 80% being deposited near Mudao, Yamen, Jitimen and Hengmen. Knife Gate every year about 100 meters into the ocean speed. This is the objective foundation for the reclamation of the sea. Pearl River Shaodong Development Co., Ltd. and other integrated four units, joint venture investment in 1983 began in Saber Gate Xijiang two corners of the sea around the field. By 1987, it has successfully reclaimed 48,000 mu and mainly engaged in agriculture and aquaculture.