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短缺实测流量资料的中小流域(F<1000km~2) 设计洪水多据设计暴雨推算,传统的做法假定设计暴雨与设计洪水同频率,并设流域为集总输入系统,即降雨空间分布均匀,下垫面条件一致。我国中小流域设计暴雨推求方法是逐步完善的,近年来在时深、面深关系方面又有很大提高,但设计雨型推求方法从六十年代初期沿用至今未作进一步探讨。现行设计雨型推求方法是在一个暴雨一致区内选取一定量级以上的单站实测大暴雨,按雨峰出现规律综合出该区设计降雨时程分配,以同频率的各时段面雨量按长包短控制予以推算。
The design floods of medium and small watersheds (F <1000km ~ 2) short of actual measured flow data are calculated according to the design torrential rain. The traditional practice assumes that the design storm and design floods have the same frequency, and the river basin is a lumped input system, that is, Mat surface conditions. The methods of designing rainstorms for designing medium and small watersheds in China are gradually being improved. In recent years, there has been a great improvement in terms of time-depth and surface-depth relations. However, the design of rainfall-type inference methods has not been further explored since the early 1960s. The current design of rainfall-based method is to select a single heavy rainfall above a certain level in a heavy rainfall consistent area, according to the law of the rain peak to synthesize the rainfall distribution of this area design, with the same frequency of each period of surface rainfall by long package Short control to be estimated.