The effects of rainfall regimes and rainfall characteristics on peak discharge in a small debris flow-prone catchment
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The effects of rainfall regimes and rainfall characteristics on peak discharge in a small debris flow-prone catchment WEI Zhen-lei1
https://orcid.org/0000-0002-3752-7119; e-mail: [email protected]
SUN Hong-yue2* XU Hao-di1 WU Gang2 XIE Wei1
https://orcid.org/0000-0002-2267-305X;
e-mail: [email protected]
https://orcid.org/0000-0002-1117-3527; e-mail: [email protected] https://orcid.org/0000-0002-5247-2603; e-mail: [email protected] https://orcid.org/0000-0003-1444-2873; e-mail: [email protected]
*Corresponding author 1 College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China 2 Ocean College, Zhejiang University, Zhoushan 316021, China Citation: Wei ZL, Sun HY, Xu HD, et al. (2019) The effects of rainfall regimes and rainfall characteristics on peak discharge in a small debris flow-prone catchment. Journal of Mountain Science 16(7). https://doi.org/10.1007/s11629-018-5260-3
© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract: Peak discharge plays an important role in triggering channelized debris flows. The rainfall regimes and rainfall characteristics have been demonstrated to have important influences on peak discharge. In order to explore the relationship between rainfall regimes and peak discharge, a measuring system was placed at the outlet of a small, debris flow-prone catchment. The facility consisted of an approximately rectangular stilling basin, ending with a sharp-crested weir. Six runoff events were recorded which provided a unique opportunity for characterizing the hydrological response of the debris flow-prone catchment. Then, a rainfall–runoff model was tested against the flow discharge measurements to have a deep understanding of hydrological response. Based on the calibrated rainfall-runoff model, twelve different artificially set rainfall patterns were regarded as the input parameters to investigate the effect of rainfall regimes on peak discharge. The results show that the rainfall patterns have a significant effect on peak discharge. The rainfall regimes which have higher peak rainfall intensity and peak rainfall point occur at the later part of rainfall
process are easy to generate larger peak discharge in the condition of the same cumulative rainfall and duration. Then, in order to explore the relationship between rainfall characteristics and peak discharge under different cumulative precipitation and different duration, 167 measured rainfall events were also collected. On the basis of rainfall depth, rainfall duration, and maximum hourly intensity, all the rainfall events were classified into four categories by using K-mean clustering. Rainfall regime 1 was composed of rainfall events with a moderate mean P (precipitation), a moderate D (duration), and a moderate I60 (maximum hourly intensity). Rainfall regime 2 was the group of rainfall events with a high mean P, long D. Rainfall regime 3, however, had a low P and a long D. The characteri
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