珠江河口磨刀门水道咸潮上溯主要影响因素探讨

Analysis on main driving factors of saline water intrusion in Modaomen Waterway of Pearl River

近年来珠江磨刀门水道盐水入侵呈逐渐加剧趋势。基于已有研究成果和资料,分别对影响咸潮上溯的拦门沙、上游径流及河道水深演变特性3个主要因素进行了分析,以便找出盐水入侵加剧的原因。通过探讨主要影响因素演变特性与磨刀门水道盐水入侵趋势加剧的相互作用关系,认为磨刀门口门拦门沙的蚀退以及口门向河-波型转化是盐水上溯加剧的主要原因之一,而径流量的变化是否是主要原因尚存在一定的争论,磨刀门水道下切导致盐水上溯加剧和蓄盐能力增强也是主要原因之一,但仍需进行更深入的研究和科学论证工作。

In recent years, the saline water intrusion in Modaomen Waterway of Zhujiang River has a gradually increasing trend. Based on available research achievements and data, the main influences of mouth sandbar, upstream runoff and water depth variation on the saline water intrusion are respectively analyzed. Through discussion on the correlation of variation charac- teristics of the main influence factors and increasing saline water intrusion in Modaomen Waterway, it is considered that mouth sandbar erosion and mouth transforming to river - wave type are the main causes of saline water intrusion increasing in Modaomen Waterway while runoff variation is still in dispute; river channel incising - down leading to increase of saline water storage in the waterway is also a main cause, which is still needed to be further researched and demonstrated.