混凝土渠道糙率调研综述

在查阅大量资料以及考察国内十几个大型输水工程并与各地专家及技术人员进行广泛交流的基础上，对混凝土渠道糙率的设计情况与实测资料进行综述，并作了初步分析。分析结果表明：对于能基本保持设计条件的渠道，其实际水头损失小于设计值，对于施工质量较好的现浇混凝土渠道，其均匀流段的曼宁糙率系数不大于0013。同时，给出了不同衬砌特性的混凝土渠道糙率推荐表。

Summarization of Investigation on Roughness of Concrete Channels

On the basis of consulting a vast amount of technical literatures,investigating more than ten large water transfer projects in situ and widely exchanging experience with experts and techicians at different places,a summarization on design status and measured data for roughness of concrete channels are performed and primary analysed.The results indicate that the actural head loss of a concrete channel is usually less than designed value when its design conditions remain an changed;For pour in place concrete channel with a good construction quality,the Manning roughness coefficient on the uniform flow reach is below 0.013.Finally,a recommendatory table on the data of roughness for concrete with different lining is given.