腊寨水电站取水防沙试验研究

Experimental study on the water taking and sediment prevention of Lazhai hydropower station

高水头水电站在多沙河流取水发电,取水防沙是水电站需要解决的关键技术。通过多种方案进行模型试验比选并逐步完善布置。结果表明:丁坝结合导流洞明渠加盖为推荐方案,导流洞明渠向库河中心延伸并加盖板,根据水流运动情况布置丁坝,利用导流洞明渠所在地形以及导流洞的运行作用,构成了一个完整的冲沙漏斗。水沙在漏斗内进行分离,分离后的泥沙通过导流洞排放于下游,丁坝上游的泥沙淤积相对较少,下游几乎没有河床沙向下游输移,保证了电站取水口门前清,因此推荐方案是经济合理的。

The high waterhead hydropower station takes water to generate electric power in heavily sedi- ment - carrying rivers, water taking and sediment prevention are the key technologies that the hydropower station needs to solve. This was gradually achieved through a variety of programs for model test selection. The results showed that, the combination of the spur dike with open channel diversion tunnelwere the recommended scheme, with the extending of open channel diversion tunnel to the center of the reservoir river and covering plates, according to the flow movement regimes to set the layout of spur dike utilizing the topography of open channel diversion tunnel and the diversion tunnel operation role, a complete flushing sediment hopper were constituted. Water and sediment were separated in the hopper, the separated sedi- ment were discharged to the downstream through the diversion tunnel, sediment at the upstream of spur dike was relatively small, there was almost no downstream riverbed sediment transport to downstream, which assured a clean sediment envrionment before the power plant water -uptake door, so the recommended scheme was both economical and reasonable.