河口闸下水动力与泥沙清淤问题的研究

Hydrodynamic Force and Sediment Disposal down Floodgate near Estuary

为优化河口防潮闸下清淤工程方案,提出了以两相流方程描述底沙运动的理论模式,建立了泥质河口二维水流、泥沙数学模型,并优化独流减河口闸下清淤工程方案.对独流减河口闸下大、中、小潮潮位、流速、含沙量过程和海床演变进行了验证,计算分析了现状地形条件下闸下泄流能力,对宽浅型和窄深型两类清淤方案的不同清淤规模的泄流能力进行了计算模拟.讨论了不同清淤规模条件下泄流能力、清淤量、回淤量与回淤率的关系,给出了各工程方案的清淤效率指标.

The optimization problem of sediment disposal engineering plans down floodgate near estuary is researched. The theoretical equations that describe two-phase flows including water and bed sand are put forward, For silt estuary, the two-dimensional flow and sediment mathematical model are set up to optimize desilting plans. In the model, the spring, middle and neap tide level, velocity, sediment concentration and seabed development are verified through comparing calculated and measured data down floodgate of the Duliujian River. The discharging capacity is calculated and analyzed under existing topography circumstances. The two types of sediment disposal plans, wide-shallow and narrow-depth, are simulated to show their effects on discharging capacity down floodgate. The discharging capacity, sediment disposal quantity, sediment re-silt quantity and re-silt efficiency under different sediment disposal conditions are discussed and the desilting efficiency data are given. The methods of two-dimensional flow and sediment mathematical model are feasible in research of hydrodynamic force and sediment disposal problems down floodgate near estuary. The results are of great aid to optimizing desilting project plans down floodgate of the Duliujian Estuary.