中全新世以来岛屿对珠江三角洲复杂河网的形成有重要作用。课题通过考察、钻孔资料、长周期数学模型和理论分析等方法，分析岛屿对三角洲动力结构的时空分布和沉积环境的变迁造成的影响，讨论岛屿在河道形成和分汊中的作用及耦合过程，从而进一步揭示珠江三角洲河网形成演变的过程机制。

The rocky islands in the palae-estuary of Pearl River Delta had played an important role in the formation of the river networks during mid-Holocene. In this project, we will discuss how the effect of the rocky islands on the dynamic structure and depositional environment of the palae-estuary, what the mechanism of branching by rocky islands is, and how the coupling process between the islands and the network system takes place based on field investigation, borehole data, long-term morphodynamic model and theoretical analysis. Then we will try to reveal the formation and evolution process of the Pearl River networks.