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一、入库洪水的概念及特性天然河道上修建水库以后,库区被淹没,形成了一个水域宽广比降平缓的人工湖泊。洪水沿水库周边汇入,回水末端至坝址处水深急剧增加,产汇流条件及水力特性发生了较大的变化。与建库前河道的洪水比较,洪峰流量增大,峰现时间提前,一次洪水的洪量有所加大,涨水段洪量比较集中,洪水历时缩短。在洪水调节计算中,在同一降雨情况的条件下。入库洪水要比天然情况下的坝址洪水恶劣。因此,在推求水库设计洪水时,从安全出发,需要考虑入库洪水的影响。
First, the concept and characteristics of the reservoir flood After the reservoir was built on the natural river, the reservoir area was submerged, forming a wide range of artificial lake lanes. The flood water relies on the periphery of the reservoir, and the water depth at the end of the backwater to the dam site sharply increases. The conditions of convergence and flow and the hydraulic characteristics have undergone great changes. Compared with the flood in the river bank before reservoir construction, flood peak flow increased and peak time was earlier. The flooding amount of a flood increased somewhat. The flooding volume in flooding section was more concentrated and the flood duration lasted longer. In flood regulation calculations, under the same rainfall conditions. Flooding is harder than damming in natural conditions. Therefore, it is necessary to consider the impact of storage floods when determining the design flood of reservoirs.