中文摘要：

珠江河口由河网区与河口湾区构成,连接两部分的是珠江口独特的地貌单元“门”.末次海进盛期古珠江海湾可分为内海湾和外海湾,现代三角洲平原与河网均发育在古内海湾.内、外古海湾通过峡口相连,这些峡口演变为现代的“门”.本文根据实测水文资料、地形图、钻孔资料,应用PRD-LTMM长周期动力-沉积-形态模型对珠江河口的“门”6000年来地貌动力学进行探讨：（1）现代“门”双向射流动力系统,（2）“门”的演进阶段,（3）“门”对古潮汐能量的集聚作用,（4）珠江河口各“门”与相应的三角洲平原的同步耦合演进,（5）“门”对珠江河网形成的作用.

英文摘要：

The Pearl River estuary system consists of a complicated stream network and estuarine bays, the two portions of the estuary system are connected by ＇men＇ （meaning ＇gate＇ in Chinese）, a special morphological unit. During the last transgression, the ancient Pearl River estuarine bay was separated into inner and outer bays by a series of rocky islands. The brackish water of inner and outer bays is connected at only several locations through rocky gorges which became ＇gates＇, the outlets of the network system. Based on hydrographical investigations, bore hole data, topographic maps and with the application of the long-term morphodynamic model PRD-LTMM on the delta evolution since 6000 aBP, the present a morphodynamic study focuses on （1） bi-direction jet system of modem ＇gate＇, （2） evolution of ＇gate＇, （3） effect of ＇gate＇ on tidal energy convergence, （4） coupling development of ＇gate＇ with the associated Pearl River Delta plain, and （5） mechanism of ＇gate＇ on the formation of the network system. Mainly due to the geological constraint of the coast and the effects on the re-distribution of marine and river energy, the evolution of the Pearl River Delta and estuary system is unique among the large scale delta and estuary systems in the world.