【摘要】 针对长江重庆河段复杂的水沙运动特点和地形条件,考虑悬移质和推移质运动,采用有限体积方法建立了平面二维非恒定水沙数学模型,对重庆河段的水流运动和泥沙冲淤进行了模拟。模型中针对长江河道的实际情况,采用李义天提出的分组挟沙力级配计算方法以及床沙质范围界定方法,对现有三峡库区数学模型进行了改进,并利用重庆河段原型观测资料对模型进行了验证。结果表明,模型计算的沿程水位、断面流速分布和河床冲淤变化与资料符合较好,此模型可以用于重庆河道的水沙变化问题研究。更多还原

【Abstract】 A 2-D numerical model for unsteady flow and sediment transport in Chongqing reach is developed with considering its channel characteristic,Based on the last research in the non-equilibrium sediment transport theory,the formulae of sediment carrying capacity to reflect the features of suspend and bed-load transport in Chongqing Reach brought forward by Li Yi-tian is adopted in this model.Verification demonstrates that the model can effectively simulate the water and sediment transport with scouring and silting on the riverbed in Chongqing Reach.更多还原