输水渠道设计中糙率取值的模型分析

梁谦; 程建萍; 田建良; 肖让; 李星; 马成晓

引用本文:	梁谦,程建萍,田建良,等.输水渠道设计中糙率取值的模型分析[J].灌溉排水学报,0,():-.
	liangqian,Cheng Jian-ping,Tian Jian-liang,et al.输水渠道设计中糙率取值的模型分析[J].灌溉排水学报,0,():-.

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输水渠道设计中糙率取值的模型分析
梁谦¹, 程建萍², 田建良², 肖让², 李星², 马成晓³
1.河西学院土木工程学院张掖河西走廊水资源保护利用研究所张掖;2.河西学院;3.石河子大学水利建筑工程学院石河子

摘要:

【目的】文章主要研究在输水渠道设计中,糙率对影响设计断面各水力要素之间的关系。【方法】主要是通过水工模型试验,测定不同流量下各水力要素值,通过分析比较,总结得出影响输水渠道输水能力的参数取值及水力要素的相互关系。【结果】结果1：经试验分析得知输水渠道水力计算设计中,水头损失主要以沿程水头损失为主；结果2：输水过程中影响沿程水头损失的因素不仅仅是流速和流量,还需要考虑糙率和流态。【结论】通过试验得出,渠道断面水深和流量的关系为不是简单的线性关系,在设计中要针对不同渠道断面形状,通过模型试验或结合理论的渠道水面曲线计算确定；设计输水渠道的糙率值的取用,并不能单纯取用糙率取值范围的中间值,而是针对水流流态及施工水平和运行年限综合确定。

关键词: 过堰流量;沿程水头损失;断面平均流速;糙率

DOI：

分类号:TV131.61

基金项目:甘肃省教育厅高等学校创新能力提升项目（2019B-147）；河西学院创新与应用校长基金项目（XZ2017002）；甘肃省教育厅高等学校创新基金项目（2020B-212）；灌溉渠道超声波精准计量技术试验研究（H2019005）。

Experimental study on the influence of hydraulic factors on the design of irrigation canal

liangqian¹, Cheng Jian-ping¹, Tian Jian-liang², Xiao Rang², Li Xing², Ma Cheng-xiao³

1.HeXi University;2.He Xi University;3.College of Water conservancy & Building Engineering Shi He Zi University

Abstract:

This paper mainly studies the relationship between the hydraulic factors which affect the design section in the design of water conveyance channel. The hydraulic model test is used to measure the value of hydraulic factors under different flow rate, and through analysis and comparison, the parameter value and the relationship of hydraulic factors are concluded. According to the test and analysis, in the hydraulic calculation and design of the water conveyance channel, frictional head loss is mainly along the way; In the process of water conveyance, the factors that affect the frictional head loss are not only the velocity and flow, but also the roughness and flow pattern; At the same time, the relationship between water depth and discharge of channel section is not a simple linear relationship, which should be determined by model test or theoretical calculation of channel water surface curve according to different channel section shapes in design; The selection and use of roughness value of designed water conveyance channel can not only take the middle value of roughness value range, but also comprehensively determine the flow pattern, construction level and operation life.

Key words: Weir discharge; Frictional head loss; Average velocity of cross section; Roughness