李家岸引黄灌区骨干渠道糙率原型观测

Prototype Observation of Roughness Coefficient of Main Channels in Lijia’an Yellow River Diversion Irrigation Area

以德州市李家岸引黄灌区为背景,选择灌区10条不同流量等级的骨干渠道进行了原型糙率观测试验,提出渠道不同断面设计形式及衬砌型式下所对应的糙率值。分析结果表明,单一材料衬砌渠道和多种材料复合衬砌渠道的糙率实测值均比设计值大,通过分析原因发现,断面几何尺寸不标准、渠道淤积、渠底比降等水文要素方面的偏差均为造成渠道实际糙率值偏大的原因。灌区骨干渠道糙率原型观测结果可为灌区渠道设计及运行管理提供基础资料。

Based on the background of the Yellow River diversion irrigation area in Lijia’an,Dezhou City,10 main channels with different flow grades are selected to carry out the prototype roughness observation test.The roughness values corresponding to different channel section design and lining types are proposed.The analysis results show that the measured roughness values of single material lining channel and multi-material composite lining channel are larger than the design values.Through the analysis of the causes,it is found that the deviation such as the non-standard cross-section geometry size,channel silting,channel bottom gradient and other hydrological factors are the reasons for higher actual roughness values of the channel.The prototype observation results of main canal in irrigation district can provide basic data for channel design and operation management.