基于Flood Area模型的模袋混凝土衬砌渠道糙率系数改进技术研究

Research on Improvement Technology of Channel Roughness Coefficient of Formwork Bag Concrete Lining Based on Flood Area Model

以河套灌区建设一分干模袋混凝土衬砌渠道为研究对象,利用Flood Area模型,将糙率系数的设置做区分化处理;对渠道区域与坡面区域进行划分和赋值,在经验参数的基础上,结合建设一分干模袋混凝土衬砌渠道实际情况,设置栅格糙率系数,增加糙率系数的精度。结果表明改进后的方法提高了流速,简化了率定流程,解决了模拟流速普遍偏低的问题。利用高程与糙率系数的函数关系,较全面、真实地仿真模拟模袋混凝土衬砌渠道的流场。

Taking the construction of a dry mould-bag concrete lined canal in Hetao irrigation area as the research object,the Flood Area model was used to differentiate the area with the setting of roughness coefficient.The channel area and the slope area were divided and assigned.Based on the empirical parameters,the roughness coefficient of the grid was set to increase the roughness coefficient accuracy in combination with the actual situation of constructing a dry mold bag concrete lining channel.The results show that the improved method improves the flow velocity,simplifies the calibration process,and solves the problem of generally low simulated flow velocity.Based on the function of height and roughness coefficient,the flow field of the concrete lining channel of mold bag is simulated comprehensively and truly.