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曼宁糙率系数 Manning roughness factor ; Manning roughness coefficient ; Manning coarse rate
The methods of determining infiltration parameters and roughness coefficient for surface irrigation are reviewed in this paper,the characteristics of every method are discussed.
对地面灌溉土壤入渗参数和田面糙率系数的各种确定方法进行总结,分析了各种方法的特点。
参考来源 - 地面灌溉土壤入渗参数及糙率系数确定方法研究综述·2,447,543篇论文数据，部分数据来源于NoteExpress
实例计算与方法验证表明，该方法能够简单而有效地确定膜孔灌溉田面综合糙率系数。
With combining optimization method, an optimal model of determining synthetic surface roughness coefficient in film hole irrigation was developed.
对于不同粗糙程度的壁面，在同一流量条件下的糙率系数会随着相对粗糙度的增大而增大。
The roughness coefficient increases when the relative roughness of the surface becomes larger under the same condition of discharge.
糙率系数作为水力计算中一个至关重要的参数，对其变化规律及取值范围的研究是进行各种水利工程设计、施工、运行和管理过程中的重要工作。
The roughness coefficient as an important parameter is very critical and useful to the hydraulic engineering whenever on the stage of design, construction, operation and management of the project.
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