水电站的日調节在上游和下游引起不稳定流。在許多情况下这种不稳定流对水电站的工作会有很显著的影响。由于上下游水位的变化,水电站的水头跟着变动。最小水头在时間上差不多是和水电站的最高負荷相重合的。这样,对低水头电站就可能由于水头的不足而不能达到装机容量的出力,也就是說負担峯荷受到一定的限制。由于水头的变 Daily regulation of hydropower stations causes unstable flows upstream and downstream. In many cases this unsteady flow can have a significant impact on the work of a hydropower station. Due to changes in the water level upstream and downstream, hydropower station head followed change. The minimum head time is about the same as the maximum load of the hydropower station. In this way, low-head power station may be due to lack of head can not reach the installed capacity of the output, which means that the burden of peak load subject to certain restrictions. As the head of the change