宁夏引黄灌区骨干渠道糙率原型观测分析

发布时间：2018-12-16 20:59

【摘要】：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。
[Abstract]:In order to provide favorable conditions for the design and operation of the lining canal, and to accumulate the prototype observation experience and results of the roughness of the lining channel, 11 representative backbone channels with different flow levels were selected in Ningxia Yellow River diversion Irrigation area. To carry out the prototype roughness observation test of lining channel; According to the actual situation of lining channel in Ningxia Yellow River Irrigation District, the roughness of different lining materials is suggested. The results show that the roughness of the measured data rate is generally larger than that of the design, whether it is the lining channel with a single material or the composite lining channel with multiple materials, which is due to the non-standard geometric size of the section. The deviation between the ratio drop of canal bottom and the design is big, and the sediment content of canal water in different irrigation season is very large. Cast-in-situ concrete, precast concrete slabs, gabion cages filled with pebbles, GB cages filled with boulders, the recommended values of gravel roughness are 0.013 5% 0.014 0 0 0 14 5 0 0 0 028 0 30% 0 027% 0.027 0 0 029 0 026 0 029.
【作者单位】：宁夏秦汉渠管理处;宁夏水利科学研究院;
【基金】：国家“十二五”科技支撑计划(2011BAD29B07) 水利部公益性行业科研专项项目(201301095)
【分类号】：S277;TV672

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