EGU2020-4072
https://doi.org/10.5194/egusphere-egu2020-4072
EGU General Assembly 2020
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

A stochastic rainfall model that can reproduce important rainfall properties across the timescales from several minutes to a decade

Dongkyun Kim1 and Christian Onof2
Dongkyun Kim and Christian Onof
  • 1Civil Engineering, Hongik University, Seoul, Korea, Republic of (dekaykim@gmail.com)
  • 2Department of Civil and Environmental Engineering, Imperial College London, London, UK (c.onof@imperial.ac.uk)

We introduce a stochastic model reproducing various rainfall characteristics at timescales between 5 minutes and one decade. The model is composed of three moduels as follow: First, the model generates the fine-scale rainfall data based on a type of Bartlett-Lewis rectangular pulse model; Second, sequence of the generated rainstorms are shuffled so that their correlation structure can be preserved; Third, the time series is rearranged at the monthly timescale to reflect the coarse scale correlation structure. The method was tested based on the 69 years of 5-minute rainfall data of Bochum, Germany. The mean, variance, covariance, skewness, and proportion of wet/dry periods were well reproduced at the timescales from 5 minutes to a decade. The extreme values were also successfully reproduced at the timescales between 5 minutes and 3 days. The antecedent moisture condition before an extreme rainfall event was reproduced well too.

How to cite: Kim, D. and Onof, C.: A stochastic rainfall model that can reproduce important rainfall properties across the timescales from several minutes to a decade, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-4072, https://doi.org/10.5194/egusphere-egu2020-4072, 2020