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

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 characteristics 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.