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冰盖引起的流动阻力是研究河冰生消演变及其运动规律的关键问题之一 .封冻阻力使河流水位壅高、过流能力降低、水位流量关系改变 .本文应用Prandtl半经验紊流理论 ,推导得到封冻河道水力要素间的理论关系表达式 ,并对冰盖影响区与床面影响区的交界位置进行了分析讨论 ;对由流速分布推算冰盖及河床糙率的计算方法进行了研究 ,并与现场实测资料进行了验证 .
The flow resistance caused by the ice cap is one of the key issues to study the evolution and movement of river ice.Freezing resistance makes the river water level 壅 high, the overcurrent decreased, the relationship between water level and flow changes.This paper uses Prandtl semi-empirical turbulence theory, The expression of the theoretical relation between the hydraulic elements in the frozen channel was deduced and the boundary position between the influence zone of the ice cap and the influence zone of the bed surface was analyzed and discussed. The calculation method of calculating the roughness of the ice cap and the riverbed by the velocity distribution was studied, And verified with on-site data.