【摘要】 东江下游三角洲发生的河道采沙、航道整治等人类活动对该河网区河床形态的自然演变过程产生了较大影响,引起河网区水动力产生相应的调整。基于非结构网格有限体积法的二维潮流数学模型,对倒运海水道疏浚工程实施后二维潮流场进行模拟研究,并从动力场的角度分析河网区航道整治效果。计算结果表明,工程实施后对水流的影响主要集中在工程附近水域,对河道沿程水位及流速的影响较小,可为其它河网地区的航道整治工程提供参考。更多还原

【Abstract】 Sand excavation and channel regulation in Dongjiang delta have great impacts on the natural evolution of the river network area riverbed morphology.The two-dimensional tidal flow mathematical model is used for the tidal current study of Daoyunhai waterway,in which the finite volume method is adopted.On the basis of the model verification against the field-measured date,numerical simulation of tidal flow field before and after regulation is carried out.The treatment scheme of the hydrodynamic is calculated,and the river network channel regulation from the point of view of the dynamic field is analyzed.The study results show that the impact on the flow of water after implementation of the project mainly concentrates in the vicinity of the project.The impact on the drop,flow rate and water level of the river are small.Moreover,it provides the theoretical guidance of channel regulation in the tidal river network area.更多还原