乌斯图河渠首的排沙漏斗设计

Sand Funnel Design of Headworks of the Wustu River

乌斯图河底栏栅式渠首进入引水渠中的泥沙，是采用排沙漏斗进行二次处理的。排沙漏斗不同于其它型式的沉沙池，它具有竖向螺旋水流结构，能连续引水排沙；其排沙流量仅占漏斗设计流量的７％左右，排沙率大于９０％，是节水型的排沙设施，这对于干旱缺水的地区有着现实的意义。本设计考虑了上游引水渠和下游冲沙廊道布置对漏斗水流整体的影响。该工程自１９９２年建成至今，引水排沙效果良好。

The sediment,which is diverted to the open channel through the bottom rack of the dam on the Wustu River,is again discharged by a sand funnel.The sand funnel is different from other usual desilting basins.The sand funnel has vertical spiral flow,and can divert water and drain sediment continuously.The water discharging when desilting covers only about 7 percent of the total design discharge of the sand funnel,and the transport rate is more than 90 percent.This water saving facility has obvious significance to arid dry areas.The design considers the integral effect of the upstream headwater channel and downstream scout gallery.This project has run quite well since the completion of the project in 1992.