河道二维非恒定流场计算方法研究

The calculation of two dimensional unsteady flow pattern in natural rivers

本文提出了天然河道二维非恒定流速场计算的通用数学模型。该模型克服了天然河道边界形状复杂、长宽尺度相差悬殊以及由于水位波动引起计算边界变化等困难。本文指出了算子分裂法在实用上的局限性,它只适用流态空间变化不剧烈的情况。用本文提出的方法对长江口及苏州河口流场进行了计算,计算与实测吻合良好。

A universal mathematicl model for the computation of 2-D unsteady flow pattern in natural rivers is presented in this paper. Computational difficulties in natural rivers, such as complicated boundary figures and its variation due to fluctuating of water level, great disparity between width and length of computational domain etc, could be overcome by the presen -ted model. The authors point out that the operator splitting method is only applicable to the cases where the variation of flow patttern is gradul. Computional results for the Yantze river and the mouth of Suzhou river were compared with observed data and agreements were satisfied.