考虑滩地横比降漫滩水流二维流速解析解研究

The Research of Two Dimensional Analytical Solution for Overbank Flow Velocity on the Floodplain Transverse Slope

黄河下游河道滩地横比降较大,大洪水时漫滩行洪,滩槽水沙交换剧烈,考虑滩地横比降的影响既符合实际又具有较强的理论意义。漫滩水流流速是研究河流横断面形态调整的重要水力参数,目前对其二维解析解的研究均未考虑滩地横比降的影响。在前人研究基础上,推导出考虑滩地横比降影响的漫滩水流运动方程,拟合无因次横向涡黏性系数计算公式,求解滩地垂线平均流速横向分布的解析解,并利用实测资料进行验证。验证结果表明该解析解可以用来计算滩地垂线平均流速横向分布。

The floodplain transverse slope is large in the lower reaches of the Yellow River. It is necessary to consider the floodplain trans-verse slope. The overbank flow velocity is an important hydraulic parameter. The research of its two dimensional analytical solution did not consider the floodplain transverse slope. This paper derived the motion equation considering the floodplain transverse slope,fitted the trans-verse eddy viscosity coefficient equation and solved the two dimensional analytical solution. The analytical solution was verified by the meas-ured date and the result was reasonable.