磨刀门水道垂向盐水楔及其流动的二维精细模拟

磨刀门水道观测结果发现,在盐水上溯过程中盐水楔存在与流动相关的典型内部结构.模拟盐水楔结构对盐水运动的作用,针对盐水楔结构及其运动和变化特点,提出河口盐水运动的精细模拟计算方法.盐度垂向分布计算结果与实测结果较为接近,速度垂向分布计算误差较大.在连续24h大潮中盐水楔垂向二维运动的模拟计算结果显示,涨潮阶段盐水楔间断结构保持稳定并向上游运动,最大流速出现在河道中部间断面附近;落潮阶段盐水楔的间断面结构溃灭并向下游移动,垂向最大流速出现在水道表层.

2D refined simulation on vertical saline water wedge and its flow for Modaomen waterway

It is found that a typical interior structure of saline water wedge is related to the flow from the measurement results during the saline water intrusion of Modaomen waterway. The effect of saline water wedge structure on saline water motion is simulated; as to the saline water wedge structure and its motion and change characteristics, a refined simulation and calculation method on saline water motion at estuary is proposed. The calculation results of the vertical distribution of salinity are closer to the measurement data, but the calculation error on the vertical distribution of velocity is bigger. Assuming the big tide continues for 24 h, the simulation and calculation results on the vertical 2D motion of saline water wedge show that, the discontinuous structure of saline water wedge moves steadily to the upstream during the rising tide, and the maximum velocity locates around the discontinuity surface of middle waterway; the discontinuous structure of saline water wedge is collapsed and moves downstream during the ebb tide, and the maximum flow velocity appears at the surface layer of the waterway.