Hydrologic analysis of urban catchments with event-based probabilistic models - 2. Peak discharge rate

被引:49
作者
Guo, YP [1 ]
Adams, BJ [1 ]
机构
[1] Univ Toronto, Dept Civil Engn, Toronto, ON M5S 1A4, Canada
关键词
D O I
10.1029/98WR02448
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The peak discharge rate of a runoff event is estimated from the runoff event volume, the duration of the causal rainfall event, and the catchment time of concentration. The runoff event Volume is determined from the rainfall-runoff relationship developed by GLIO and Adams [this issue]. The average catchment time of concentration is used for all runoff events and is treated as a physical characteristic of the urban catchment, independent of input rainfall characteristics. Incorporating the exponential probability density functions of rainfall event characteristics, closed-form analytical expressions are then derived for the return period of peak discharge rate or flood frequency distribution of urban catchments. The derived flood frequency distributions compared favorably with sample distributions constructed from continuous simulation results for a range of urban catchments. Thus the derived analytical expressions or probabilistic models for peak discharge rates are proposed as an alternative to simulation modeling or regional analyses for the determination of flood frequencies for urban catchments.
引用
收藏
页码:3433 / 3443
页数:11
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