珠江磨刀门河口咸潮活动对流域调水工程的响应

Response of Saltwater Activity of Modaomen Estuary of Pearl River to Inter-basin Water Transfer Project

为分析珠江三角洲水资源配置工程(流域调水)建成后对珠江磨刀门河口咸潮入侵范围及沿岸取水口取水条件的影响,采用珠江河口整体三维斜压数学模型,研究珠江磨刀门河口咸潮活动对不同流域调水方案的响应。结果表明,磨刀门水道下游不同位置的取淡机率对上游水资源配置工程的取水量(80、160、240m^3)变化敏感性不同,在径潮动力互相平衡区域(滞留点)附近,各级取水流量下,取淡率变化幅度在5%~8%之间;当上游取水量逐渐增大时,咸水界也随之上移,每增加80m^3的取水量,咸水界上移0.9~1.1km。研究成果可为珠江三角洲水资源配置工程提供参考。

In order to analyze the influence of water resource allocation project （water diversion） in the Pearl River Delta on the intrusion range of the salt water in the Modaomen estuary and water intake conditions, a whole three-dimen sional baroclinic mathematical model of the Pearl River estuary was used to study the response of estuary salt waler in struetion to different water diversion schemes for river basins. The results show that the fresh water ratio in different lo- cations of Modaomen estuary has different sensitivity to the variation of water withdrawals （80,160,240 m^3）. At the bal ance zone of runoff power and tidal forces （near the stagnation point）, fresh water ratio variation is in the range of 5 and 8%. As the upstream water withdrawals gradually increases, the salt water boundary also moves up, for each in crease of 80 ma , the salt water boundary was shifted 0.9-1.1 km. The research can provide reference for water resources allocation project in the Pearl River Delta.