基于下泄水温控制考虑的水库分层取水建筑物设计

Design of layered water intake structures for reservoir under consideration of temperature control of discharge water

水库分层取水建筑物主要有两大类,即竖井式和斜涵卧管式。斜涵卧管式只能适用于取水深度、流量较小的水库,竖井式可用于取水流量较大的深水水库。通过设置不同高程进水口或竖向流道,由闸门控制实现表层取水,提高下泄水温。结合江坪河水电站工程分层取水建筑物设计实践,对竖向流道型和分层进水口型分层取水建筑物进行了方案比选,对选定的竖向流道型分层取水建筑物,从结构布置、流道设计、金属结构、操作运行等方面进行了探讨,并给出了江坪河水电站设计实例。

Layered water intake structures of reservoir are divided into two types of shaft and inclined culvert horizontal-tube. The intake with inclined culvert horizontal-tube is only suitable for reservoirs with relatively small intake depth and flow, but the shaft type is applicable to deep reservoir with big intake flow. With the layout of varied altitudes intakes and vertical flow paths, surface water taking is realized through gate control and temperature of discharge water is risen. Comparison is made for the intakes of vertical flow path and layered water intake structures, based on the design of Layered water intake structures of Jiangpinghe Hydropower Station. Discussion is made on the selected vertical type of layered water intake structures in the respects of structure layout, flow path design, metal structures and operation. Typical case of Jiangpinghe Hydropower Station is referenced for study.