疏浚抛泥工程引起的悬沙增量变化分析

由描述工程前后二维悬沙运动的控制方程出发,梳理了二维悬沙增量控制方程的推导过程.利用过程中一系列的简化,阐明了悬沙增量方程与悬沙方程不仅是形式上的不同,其近底泥沙通量项已发生物理意义的改变,且求解的泥沙边界条件也发生变化.工程抛泥若造成沉降机率、沉降速度等参数及物理量发生较大变化,悬沙增量方程能否采用值得重新商榷,因此其适用范围需在计算中加以关注.在本文的实例计算中发现,采用工程前后悬沙运动控制方程比较得到的结果与悬沙增量控制方程计算结果大致相同.悬沙增量方程在实例中得到了较好的应用.

Analysis of suspended sediment concentration increment induced by dredging and dumping

By describing the governing equations of pre-and post-dredging project,this paper discusses the two dimensional suspended sediment increment governing equation.The result shows it is different from the suspended sediment governing equation not only in the form,but also in the physical meaning of near-bed sediment flux.The boundary conditions of sediment calculation are also changed.The suspended sediment increment governing equation is reasonable or not open to the question,if the parameters or the variances,such as deposition probability,settling velocity,etc.,are affected by the dredging project.It is applied successfully to a case.The results calculated by the suspended sediment increment governing equation are similar with the ones using the governing equations of pre-and post-dredging project.