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根据刘家峡水库三次汛前低水位排沙实测资料,分析冲刷成因,排沙效果,提出用水文预报寻求合理的排沙时机。将排沙期划分成预泄期、冲刷期和巩固期。预泄期由排沙初始水位降至1699m,流量1500m~3/s左右。冲删期水位由1699m降至1695m左右,流量采用2000m~3/s左右。预泄期和冲刷期应在流域产、汇流历时内完成,总历时约120～150小时。为了使排沙后洮河库区推移的床沙不在坝前淤积,应有一个较小流量的巩固期,其流量1200m~3/s左右,历时视上游来水、洮河来水来沙及发电等情况灵活掌握。
According to the measured data of sediment discharge before flood season under three floods in Liujiaxia Reservoir, the causes of sediment flushing and sediment discharge were analyzed. It is proposed to seek reasonable timing of sediment discharge by hydrological forecasting. Sand discharge period is divided into pre-discharge period, flushing period and consolidation period. Pre-discharge period from the initial sediment discharge water level dropped to 1699m, flow 1500m ~ 3 / s or so. Reduce the water level from 1699m down to 1695m, the flow of 2000m ~ 3 / s or so. Pre-discharge period and the flushing period should be completed within the basin production and convergence within a total duration of about 120 to 150 hours. In order to make the bed sediment after the sediment discharge in the Bahe River reservoir not to be deposited in front of the dam, there should be a consolidation period with a relatively small flow rate of 1200m ~ 3 / s, which lasted as the upper reaches of the riverbed, Power generation and other flexible situation.