“门”地貌单元的能量耗散和过程机制

Energy dissipation and its mechanism induced by “gate” topography

基岩岛屿组成的"门"地貌单元是珠江河口区别于世界其他河口的重要地貌特征之一。文章基于重整化群k-ε湍流模型(RNG k-ε)的FLOW3D流体计算模型研究了"门"地貌单元的时均动力结构及湍流能耗特性。"门"地形致动力结构伴随不同类型能耗区。根据能耗空间分布特性可分为核心区(A1区)、混合区(A2区)、上游区(A3区)、下游区(A4区)。"门"地形作用下,不同分区的动力结构、湍流特性、能量转化、能量耗散特征及其驱动机制不同。

The Pearl River Estuary system is distinguished from other estuary systems with its ＂men＂（meaning ＂gate＂ in Chinese）,a special morphological unit,which produces complicated average flow and turbulent flow,and impacts its energy dissipation.Based on FLOW3D’s RNG（Re-Normalization Group） k-ε model,the authors studied the energy dissipation and its mechanism induced by ＂gate＂ topography.The sub-area of the energy dissipation zone can be distinguished with the jet core zone（A1 zone）,the mixing zone（A2 zone）,the far zone（A3 zone and A4 zone）.The conservation of mechanical energy and the mechanism of these subareas are different.