论文部分内容阅读
考虑到杭州湾较浅,面积大而地形变化不剧烈,沉积物粘性差且其输运方式主要是悬移,我们假定其单位体积水体内的砂量是达到动态平衡的,故采用《平衡输砂原理》的Bagnold公式计算了沉积物的输运量,并用净输运量的散度来表征湾内沉积物的冲淤区域的分布。所得结果与实测结果基本相符。从而为今后在类似的河口湾中进行沉积物冲淤预测提供了依据和手段。在潮波计算中本文采用了Gray提出的一种与Simpson求积公式相结合的等参有限元方法,避免了复杂的数值求积计算。对二维潮波计算中出现的短波扰动则采用了适当的平滑手段,计算结果与实测相比,符合的程度较高。
Taking into account the shallow, large area of Hangzhou Bay and less severe terrain changes, the sediment viscosity is poor and its transport mode is mainly suspended, we assume that the sand volume per unit volume of water is to achieve dynamic equilibrium, so the use of “balanced transport Sand Principle ”Bagnold formula to calculate the amount of sediment transport, and the use of net transport volume divergence to characterize the distribution of sediment within the area of the scour and silting. The results obtained and the measured results are basically consistent. Which will provide the basis and method for the sediment deposition prediction in similar estuaries in the future. In the tidal wave calculation, this paper adopts the isoparametric finite element method proposed by Gray, which is combined with the Simpson quadrature formula to avoid complicated numerical quadrature calculation. The appropriate smoothing method is adopted for the shortwave perturbations in the calculation of two-dimensional tidal wave. The calculated results are in good agreement with the measured ones.