长江口深水航道回淤量预测数学模型的开发及应用

Development and Application of Mathematical Model for Prediction of Backsilting Quantity in Yangtze Estuary Deepwater Channel

通过对长江口径流、潮流和波浪共同作用下的泥沙运动规律的研究,开发并建立了长江口全沙(悬沙和底沙)数学模型。大量实测资料验证表明,该数学模型可以较好地模拟长江口地区的潮位、流速、流向、含沙量、底沙、分流比、南北槽地形变化和台风暴潮造成的航道骤淤情况。在此基础上采用全沙模型研究了长江口深水航道治理工程一、二、三期工程实施后航道的年回淤量和回淤分布以及发生“二碰头”和“三碰头”时的航道回淤量。一、二期工程建成后的航道实测回淤资料表明,全沙数学模型所预报的航道回淤分布和淤积总量与实测值相当接近。

Based on the study of sediment transport under the actions of tidal currents and wind waves, a mathematical model of suspended load and bed load for Yangtze Estuary is developed. The verification resuhs show that the model can simulate well the tidal levels, current velocities, sediment concentration, bed load transport,diversion ratio in the bifurcation section, topographic change of the north and south channels, as well as sudden siltation caused by typhoons. The back-silting quantities and distributions of Yangtze Estuary Deepwater Channel Project in three phases under normal and typhoon conditions are predicted. The siltation measured in the channel after the first and second phases indicted that the predicted values are in agreement with the measured ones.