当河槽床面与河岸的糙率不同时,其综合糙率随水深变化。本文提出的分析准则是:若岸壁糙率较大,综合糙率随水深的增大而增加;若岸壁较光滑,综合糙率随水深的增大而减小。根据我国铁路、公路系统编制糙率表中顺直冲淤微弱河流实测资料检验表明,这一分析准则是合乎实际的。 When the roughness of riverbed bed and riverbank is different, the comprehensive roughness changes with water depth. The analytical criteria proposed in this paper are as follows: If the roughness of the wall is large, the comprehensive roughness increases with the increase of water depth; if the shore is smooth, the integrated roughness decreases with the increase of water depth. According to the test results of the measured data of the weak river with straight scouring and silting in the rough set of the railway system and highway system in our country, the test shows that this criterion is realistic.