广州珠江感潮河网水流泥沙数值模拟

 基于EFDC模型，构建了广州珠江河网三维水动力与泥沙数学模型。通过1999年7月和2001年2月典型洪、枯季实例验证，表明模型能够较好地反映广州珠江河网水流及泥沙输运过程。输沙过程模拟结果表明，平洲水道至后航道是悬浮泥沙输移的主要路径；冲淤模拟结果表明，21世纪初期广州珠江河网主要表现为“枯冲洪淤”特点，并且河网呈缓慢淤积趋势，年均速率约为2.0 cm/a。各河段中，南航道、沥滘水道是主要的淤积河段，而沙贝海、前航道上段及新造水道是主要冲刷河段。

Numerical Simulation of Hydrodynamics and Sediment Transport in Tidal Pearl River of Guangzhou

Based on EFDC (Environmental Fluid Dynamic Code) model, a three dimensional numerical hydrodynamic and sediment transport model in Pearl River network of Guangzhou (PRGZ), was developed. The result indicated that the model was able to simulate hydrodynamics and sediment transport characteristics with fairly good accuracy verified by typical flood scenario case in July 1999 and dry scenario case in February 2001. The sediment transport result showed that Pingzhou to HouHangdao were the major transportation channel for suspended sediment during flood season. Erosion and deposition simulation also showed that PRGZ tended to deposition in flood season with Nanhandao and Lijiaoshuidao as the major deposition area. In the dry season, PRGZ tended to erosion, which usually happened in Shabeihai, Qianhangdao upper section and Xinzao rivernet. Besides, the entire rivernet showed a slow deposition rate, approximately at a speed of 2.0 cm/a.