中文摘要：

利用三级联合解法和“节点含沙量控制法”，建立了珠江三角洲河网区一维非恒定流水沙数学模型，伶仃洋平面二维水沙模型采用了正交曲线坐标下DSI和ADI法。通过虎门、蕉门、洪奇门、横门4个交接面的水位、流量和输沙量等物理量的相互传递，在每一迭代步内进行河网一维与伶仃洋二维水沙模型的嵌套计算。利用2001年2月枯季和2003年7月洪季实测的水文资料进行验证。结果表明，模型计算结果无论在珠江三角洲河网区、交接断面以及伶仃洋区均与实测资料吻合较好，该模型可用来模拟珠江三角洲河网和伶仃洋的水沙运动过程。

英文摘要：

Based on the ＂Three Steps Methods＂ and ＂junction control method for suspended sediment＂, a numerical model for simulating unsteady flow and suspended-sediment transport in river networks is presented. By transferring the water level, discharge and sediment concentration at the interface of some cross sections, a stagger calculation method is established on 1-D network and 2-D Lingding Sea. The calculated results by the coupling model are calibrated with the hydrological data synchronously measured in the Pearl River Delta region and Lingding Sea region in Feb 2001 and July 2003. The good agreement of the calculated results with the measured data of the Pearl River Delta network region, Lingding Sea region, and their intersecting regions shows that the model can be used to describe the hydrodynamic and suspended sediment process of these regions.