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| Calculation method and experimental study on roughness coefficient of mold bag concrete composite section channel |
| HUO Yizhen1.4, LI Gang2, HE Wuquan2,3*, ZHAI Donghan2,Guo Yanfen1.4 |
| 1. Hetao College, Bayannaoer, Inner Mongolia 015000, China; 2. College of Water Resources and Architectural Engineering, Northwest A &F University, Yangling, Shaanxi 712100, China; 3. Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China; 4. Irrigation and Drainage Engineering Technology Research Center of Hetao Irrigation District, Bayannaoer, Inner Mongolia 015000, China |
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Abstract At present, the roughness coefficient of mold bag concrete composite section lining channel is still determined based on empirical equation. Focusing on this problem both Z-method and channel shear stress formula were adopted to propose an equation which can be used to determine the roughness coefficient of composite section channel which has mold bag concrete slope and sand gravel bed. In order to verify the rationality of the equation, the prototype observation tests of two different channel sections were carried out in Hetao irrigation district. The results show that at different water depths and diffe-rent flow, the roughness coefficient of mold bag concrete composite cross-section lining channel lies between 0.0245 and 0.0265. The maximum relative error between the calculated value deduced from the equation and the expe-rimental value is 6.87%. It implies that the roughness coefficient calculation equation has high computational accuracy, which can meet the requirements of practical engineering application.
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Received: 12 January 2018
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