Northern Water Supply Project Precast Concrete Panels Channel Roughness Analysis

Select the roughness coefficient plays a vital role in the channel design, suitability and reliability of its value chosen management of water conservancy construction and operation has great significance. Roughness coefficient value is too large will not only increase investment in water conservancy projects and causes erosion, so that future projects damaged structure, increasing project risks; Conversely, if the roughness coefficient value is too small, the channel flow capacity decreases canal water will cause siltation diffuse drainage channels, causing the disaster. Some small and medium sized water conservancy construction in the past(the channel tunnel), are generally applied with reference to the relevant norms and experience roughness. But for the construction of large-scale water diversion project roughness coefficient values crucial, even a slight deviation would have a significant impact on the construction and future operation of investment management. Therefore, the roughness coefficient in-depth study will be very important in order to provide a more appropriate value for future project design.Based on the extensive collection and synthesis of large-scale water diversion project roughness at home and abroad, combined with the northern water supply project field measurement data to hydraulics Chezy formula and Manning’s equation as the theoretical basis, combined with years of northern run the actual water supply project Flow measurement data to analyze, research, and conduct extensive exchanges with experts and technical staff related research, design, construction, management and other units, has been a valuable first-hand information, the data analyzed using mathematical statistical methods can be obtained the range of the letter. Thus the Northern Water Supply Project precast concrete panels lining the channel roughness coefficient design values and measured data analysis carried out a comprehensive review of research results. This paper discusses the practical range of values of precast concrete panels lining the channel roughness, the establishment of large-scale long-distance water supply capacity of the channel model checking, a reasonable value for the reliability of its projects are extremely important. The measured flow through the channel, the channel roughness study to verify the actual channel flow capacity, the ability to determine the water channels in the existing conditions for the operation and management, co-ordination and scheduling future Phase II expansion project of heightening provide important theoretical support, but also for other similar projects to provide technical information and reference in the design of the selected roughness. This paper discusses the results of:(1) combined with the measured data flow northern water supply project for many years, the use of hydraulics formulas and statistical methods to analyze the roughness value of the channel to verify the actual project;(2)by studying the master North The actual water supply project in Xinjiang channel roughness values, clear water capacity of existing projects, and satisfy customer needs water project.