analysis of the u-shaped channel parabolic weir application analysis（分析u形渠道抛物线堰应用程序的分析）.docVIP

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analysis of the u-shaped channel parabolic weir application analysis（分析u形渠道抛物线堰应用程序的分析）.doc

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analysis of the u-shaped channel parabolic weir application analysis（分析u形渠道抛物线堰应用程序的分析）

Analysis of the U-shaped channel parabolic weir application analysis Abstract Donglei irrigation pumping yellow status and existing problems, the introduction of the ‘U-shaped channel flat parabolic free throat flume’ to introduce the advantages of the flume, made the promotion of technical points and improved point, that the results provide a reference application. Keywords: U-shaped channels, parabolic weir, East Ray Huang irrigation pumping, Shaanxi Weinan Dong Lei Huang is the Yellow River for the water pumping large high-lift multi-level power lift irrigation projects, irrigation area 50740 hm2, the effective irrigated area 42700 hm2, a total of trapezoidal canal irrigation 7, U-shaped branch 42, U-shaped Douqu 389 , U-shaped sub-diversion canal 3 820 bar, the average normal year water bucket mouth 70 million m3. Irrigation District has formed a base of 20,000 hm2 quality apple and small fruit base 6 666.67 hm2. the development of irrigation has greatly improved irrigated agriculture production and rural living conditions, promote irrigation constantly adjust industrial structure and regional socio-economic development. U-shaped channel has a small footprint, water conditions are good, good overall performance and ease of management and many other advantages, but not its complete set of the weir. The text of the ‘U-shaped channel flat parabolic weir without throat’ research summarize the results presented point to promote and improve the technical points, so that the results can be obtained in Shaanxi province and the country a better application. 1 status and problems of irrigation Since the 1970s, China’s extensive use of U-shaped cross-section of lining channels, because water conditions are good, over-current capacity, sediment transport capacity, frost bending, seepage silting, the overall performance is good, the provincial labor and materials, small footprint and easy management, etc., especially suitable for high lift pumping