悬移质泥沙的垂线分布

Research on vertical distribution of suspended sediment concentration

为解决Rouse公式在模拟悬移质泥沙垂线分布中的局限性,从水流的应力分析入手,通过对Einstein和Chien的泥沙试验资料进行最小二乘法拟合,得到一个新的掺混长度公式。在此基础上,得出一个新的悬移质泥沙垂线分布公式,当Rouse数等于1时,该公式与Rouse公式的相关系数达到0.9628,并且克服了Rouse公式在水面含沙量为零的缺陷。通过2010年的瓯江口各层含沙量实测资料的验证,表明新的悬移质泥沙垂线分布公式能客观反映含沙量的垂线分布规律。

The Rouse formula has limitations in simulating the vertical distribution of suspended sediment concentration.In order to solve this problem,the flow stress was analyzed and least squares fitting was performed using Einstein and Chien＇s sediment test data to obtain a new mixing length formula.Based on this,a new vertical distribution formula of suspended sediment concentration was derived.In comparison with the Rouse formula,if the Rouse number was equal to 1,the correlation between this formula and the Rouse formula reached 0.962 8.Meanwhile,the problem in the Rouse formula of the sediment concentration being zero on the surface was solved.Verified by observed data from the Oujiang Estuary in 2010,the proposed formula can objectively reflect the vertical distribution rule of sediment concentration.