山区河流电站下游河段设计低水位确定方法

Method of determining designed lowest navigable stage of the power plant downstream in a mountainous river

山区河流电站在枯水期通常采用日调节运行方式,电站下泄流量为非恒定流,致使下游河道水位起落不定,航道设计水位的确定难度较大。利用实测资料,对山区河流电站下游河段的设计低水位进行了分析计算。实践表明,对于电站下泄非恒定流,应尽量利用实测波谷时段水位进行下游河道设计低水位推求,能够满足航道整治设计的要求。

The power plants in mountainous river are operated usually in the way of daily regulation in the dry season, so the discharge released from power plant is unsteady. It courses the stage rising and falling. The designed lowest navigable stage is difficult to determine. By the use of the actual measuring data, the designed lowest navigable stage of power plant downstream in mountainous river was analyzed and computed. The practice indicated that, in the case of unsteady flow released from power plant, the stage of wave bottom should make the best use to calculate the design lowest stage. It can satisfy the request of design of channel regulation.