连岛工程促淤计算方法

Calculation methods of siltation in islands link project

通过二维潮流数值模型计算工程前后的潮流形态,利用实测水文泥沙资料确定悬沙沉降方程中的相关系数,同时考虑波浪对泥沙沉降的影响。再运用经过悬沙垂向分布参数β修正过的半理论半经验悬沙沉降方程计算工程后的冲淤强度,分析比较参数β对围涂工程冲淤强度计算值的优化效果。结果表明：通过对悬沙沉降公式的简单修正,预测的冲淤值在准确性上较修正前提高了5%~30%,整体计算冲淤值与实测冲淤值之间的相关系数由91%提高到98%。说明此修正对岔道交错,流场复杂,悬沙垂向分布在局部不同区域变化大的舟山海域围垦冲淤计算中有一定实际参考意义。

Through the before and after wave form of two- dimensional tidal current numerical model calculation of engineering, and using the equation of suspended sediment coefficient of correlation which was confirmed by observed hydrological and sediment data, also taking into account the impact of waves on sediment deposition, and further by applying the intensity of sediment that was calculated by the revised semi-theoretical semi-empirical settlement of suspended sediment equation, the semi-theoretical semi-empirical was corrected by suspended sediment vertical distribution parameter β, we analyzed and compared the optimize impact of parameter β for erosion and deposition coating engineering strength calculation values. The results show that： through simple correction of the equation of suspended sediment coefficient of correlation, the predicted erosion values on accuracy would be increased by 5 % to 30 % then before final correction, the overall correlation coefficient values between calculated erosion and measured erosion increased from 91 % to 98 %. It proofs that this amendment has the certain actual reference value for reclamation erosion calculations in Zhoushan sea area where contains different local regions changes, especially on the places of fork in the staggered, complex flow field, the vertical suspended sediment.