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为给衬砌渠道的设计及运行管理单位提供有利的条件,同时积累衬砌渠道糙率的原型观测经验与成果,选取宁夏引黄灌区具有代表性的11条不同流量级别的骨干渠道,开展衬砌渠道原型糙率观测试验;并结合宁夏引黄灌区衬砌渠道实际情况,提出不同衬砌材料的糙率建议取值。结果显示,无论是使用单一材料的衬砌渠道还是使用多种材料的复合衬砌渠道,实测数据率定的糙率值普遍较设计值偏大,偏大原因有断面几何尺寸不标准、渠底比降与设计偏差较大、不同灌季的渠水含沙量等;现浇混凝土、预制混凝土板、格宾石笼填充卵石、格宾石笼填充块石、卵砾石糙率建议值分别为0.013 5~0.014 0、0.014 5~0.015 0、0.028~0.030、0.027~0.029、0.026~0.029。
In order to provide favorable conditions for the lining channel design and operation management unit, at the same time accumulate the experience and achievements of the prototype observation of the lining channel roughness, select 11 typical drainage channels with different flow rates in Ningxia Yellow River Irrigation District, carry out the lining channel prototype Roughness rate observation test; combined with the Ningxia Yellow River irrigated canal lining the actual situation, proposed lining material of different roughness values. The results show that the measured data rate of roughness is generally larger than the designed value, whether it is using a single material lining channel or a composite lining channel with a plurality of materials. The reason for the large roughness is that the geometric dimensions of the section are not standard, With large deviations from the design, the sediment concentration in different irrigation seasons, etc. The recommended roughness values of cast-in-place concrete, precast concrete slab, gabon gabion filled stone and gabion gabion are 0.013 5 ~ 0.014 0, 0.014 5 ~ 0.015 0, 0.028 ~ 0.030, 0.027 ~ 0.029, 0.026 ~ 0.029.