论文部分内容阅读
就挡潮闸下游河道水沙运动建立了一维水沙数学模型,采用Preissmann四点隐式差分格式离散非恒定水流方程,追赶法求解,并结合有限分析法思想离散求解悬移质泥沙方程.水流方程中,上游边界条件通过闸门的开度来控制.泥沙方程中,考虑床沙粒径变化并对床沙级配进行了调整.应用该模型对姚江陶家路闸闸下河道的水位、含沙量和河床变形进行了计算和验证.验证结果显示,水位与实测吻合,含沙量与实测增长趋势一致,河床断面反映了断面的基本变化,冲淤量与实测资料比较相符.表明该模型对挡潮闸闸门控制及闸下河床变形估算具有一定的指导意义.
A one-dimensional mathematical model of water and sediment was established for water and sediment movement along the downstream of the tidal flats. Preissmann four-point implicit difference scheme was adopted to solve the unsteady flow equations and catch-up method. The suspended sediment equation In the water flow equation, the upstream boundary conditions are controlled by the opening of the sluice gates, and in the sediment equation, the sediment particle size is taken into account and the sand bed gradation is adjusted.Using this model, the water level, Sediment concentration and riverbed deformation are calculated and verified.The results show that the water level agrees with the measured data and the sediment concentration agrees well with the observed growth trend.The riverbed section reflects the basic change of the section.The amount of scouring and silting is in good agreement with the measured data The model is of guiding significance to the tidal gate control and the deformation estimation of the sub-gate riverbed.