北方河流冰期水流阻力分析

本文通过由流速分布推求冰期河道冰盖糙率系数,提出了由流速分布推算冰盖及河床糙率的计算方法,同时考虑冰盖影响区与河床的流速分布,确定最大流速位置,阐述了冰盖对水流的阻力是研究河道冰情演变及其运动规律的依据.并对河道冰期形成冰盖,其阻力使河道水位升高、过流能力降低、水位流量关系改变.流速分布推算冰盖及河床糙率的计算方法进行了分析.为北方地区基层测站的冰期测验工作提供参考.

The stream resistance analysis during glacial period in Northern Rivers

This paper puts forwards the computing method of the roughness of the ice cap and riverbed derived by the velocity distribution,taking into ice-affected zone of the river flow and distribution,determining location of maximum velocity;It expounds the water resistance caused by ice is the basis to research river course ice conditions evolution and riverbed movement,and the formation of glacial ice river,the river water level increased,the flow capacity reduced,the relation of water level and flow changed by the water resistance;It analyses the calculating method of ice cap and riverbed roughness calculated by velocity distribution,and provides the basis for the ice period measure in the gauge of Northern area.