大化水电站二期导流工程导流明渠泥沙运动与冲淤

Sediment Sluicing& Sediment Motion for Construction Diversion of Second Stage on the Dahua Hydropower Station

关键词:  大化水电站  起动流速  导流明渠  泥沙运动  冲淤

Key words:  Dahua hydropower station  incipient velocity  diversion channel  sediment motion  sluicing sediment

摘要:

大化水电站二期导流工程截流前,导流明渠基本堵塞,靠人力及机械清淤无法按时实现截流。经过分析研究,采用主河槽预抛方案提高上游水位,使导流明渠水流速由1.0m/s逐渐增大到3.25m/s,在17天内冲走25.2万m³淤积泥砂,实现了按计划截流。

Abstract:

The amount of sediment in the diversion channel of Dahua hydropower station reached 252 000 m³ which almost blocked up the channel before the second stage of river-damming of diversion construction. Clearing away the sediment by manpower and machine could not realize the riverdamming in a planned way. The employ of throw stones in advance to main river led scheme raised the water level of upper reaches and increased the water flow velocity of diversion channel from1.0 m/s to 3.25 m/s, which resulted in the sluicing away of 252 000 m³ sediment within 17 days.Thus damming the river was achieved in a planned way.