锡崖沟瀑布景观工程水力模型试验研究

根据锡崖沟景区规划设计，沿锡崖沟水库溢洪道下部开凿底洞引水，在水库下游红岩大峡谷常年形成20m宽大瀑布．以满足瀑布流的重力和紊动阻力相似的原则进行了其正态模型设计．通过模型放水试验表明：流量变化对瀑布水流流态影响很大，溢流槽空间狭小，加之上游进口扇形扩散段扩散角偏大，水流扩散不充分，堰顶溢流不均匀，瀑布景观效果差．将模型的溢流堰顶修改为T型复式断面后，顺应了水流的流动特性，在各级流量下均能获得比较好的瀑布景观效果．

Experimental Study on Hydroelectric Model of Waterfall Landscape at Xiyagou Reservoir

According to the design of Xiyagou scenic spot＇s plan,a hole was dug flowing the low part of the spillway of Xiyagou＇reservoir,in order to form a big waterfall with the width 20 m at Hongyan Grand Canyon down the stream of the reservoir throughout the year, the landscape＇s normal model was designed,which met the similarity of the gravity and turbulent resistance of the waterfall. These resuits are got through the model experiment of drawing off water,that the change of water flow has big effect on water flow form of waterfall,and bad effect of waterfall landscape happens because of narrow spillway,big diffusion angle of fan-shaped part at upstream＇ s entrance,insufficient diffusion of flow,nonuniform overflow at the top of barrage. After the top of spillway＇ s barrange is changed to T-form double section, good waterfall landscape is obtained at every flow level.