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一、三闸进咸的严重性和防咸措施的迫切性海河是天津市工农业生产、人民生活用水的主要水源,又是天津市、京杭运河和华北各河船舶出海通道.但近几年来,由于海水经河口三闸(大船闸、渔船闸、节制闸)进入海河十分严重,且进入的咸水因异重流作用迅速上溯,造成几乎整个海河水的严重咸化.例如1965年8月中旬,海河节制闸关闭(即停止用淡水冲咸入海)后仅18天,塘沽大梁子处海河水中氯化物由685毫克/立升增加到
First, the three gates into the salty of the severity and the urgency of the anti-salty measures Haihe River is the main source of water for industrial and agricultural production and people’s living in Tianjin, Tianjin, the Beijing-Hangzhou Grand Canal and the North China River vessels sailing channel, but in recent years , Seawater entering the Haihe River is very serious due to the passage of the seawater into the Haihe River through three gates (large locks, fishing locks, and control gates), and the incoming saltwater water rapidly increases due to the heavy gravity flow, resulting in serious salinization of almost the entire Haihe River water. In the middle of the year, Haihe Barrier closed (that is, stop fresh water to saltwater into the sea) only 18 days after the Tanggu beam at the Haihe River water chloride from 685 mg / liters increased to