灌溉渠道优化设计方法研究

Research on Optimal Design and Method of Irrigation Channel

根据明渠均匀流原理,推求灌溉渠道设计的最佳水力断面法和实用经济断面法,通过对2种设计方法优化对比分析,提出了实用经济断面法在灌溉渠道设计中的实用性,据此确定渠道横断面结构尺寸和不冲不淤流速的约束条件。根据渠道纵断面设计原则,确定干渠和各支渠取水口要求的控制水位的计算方法,确定渠道水位衔接的约束条件。根据渠道挖填平衡原则,确定了灌溉渠道工程量与渠道填方量、挖方量、渠道比降和填方损失系数等有关的非线性函数,该结论为灌溉渠道优化设计提供技术支撑。

Based on the principles of open channel flow,the best hydraulic design of irrigation channels,cross-section method and practical economic cross-section method are inferred by comparing the two design methods to optimize the analysis,a practical method in the economic section of the practicality of the design of irrigation channels,on the basis of determining the channel cross-section structure of this size and washes no silt flow constraints.According to longitudinal channel design principles,determine the trunk and the branch＇s control of water intake requires the calculation to determine the level of convergence of the channel constraints.According to the principle of channel cut and fill balance,we determine the quantities of irrigation channels and channel the amount of fill,excavation volume,channel gradient and fill loss coefficient of the nonlinear function.