【摘要】 本文对江河冰塞糙率的主要研究成果进行了分析,指出了目前江河冰塞糙率研究成果的共同缺点是没有把冰塞糙率与水流强度及水流的含冰率联系起来,而认为冰塞糙率是冰厚或时间的函数。根据黄河河曲段6年的冰塞实测资料,建立了冰塞糙率与河床糙率的比值和水流佛汝德数的关系。据此,对实验室模拟冰塞糙率进行了分析研究,建立了模拟冰塞糙率与河床糙率的比值和水流佛汝德数及水流含冰率等关系式。文中还对一些问题进行了讨论,认为冰塞下水内冰花的堆积运动应与泥沙在河床上的运动相似。更多还原

【Abstract】 This paper points out the shortcomings of previous studies on roughness coefficient of river ice jams: people often thought that the roughness coefficient of ice jam (n1) was only a function of ice cover thickness or time, and they didnot notice the relation between n1/nb (nb-roughness coefficient of river bed),Froude Number Fr and ice concentration of water Qi/Q.Based on the field observation made for six years on Hequ reach of the Yellow River, the relationship between n1/nb and Fr has been found. This founding makes possible to simulate the roughness coefficient of ice jams in laboratory and to find the relationship between n1/nb and Fr, Q1/Q. Other problems have also been discussed in this paper, it is considered that the accumulation of frazil ice under ice jam would be similar to the sedimentation of silt on river bed.更多还原