Citation

Hayashi S, Yamada T, Kawabe H. J. Jpn. Soc. Nat. Disaster Sci. 2019; 38(3): 377-387.

Copyright

(Copyright © 2019, Japan Society for Natural Disaster Science)

DOI

10.24762/jndsj.38.3_377

PMID

unavailable

Abstract

Duration and intensity characteristics of heavy rainfall that caused sediment disaster were studied. First, we classified the types of heavy rainfall into three types: high active heavy rainfall with extremely high intensity and short duration(hereinafter, it is written as H.A.H.R.), active heavy rainfall with very high intensity(hereinafter, it is written as A.H.R.), long active heavy rainfall with high intensity and long duration (hereinafter, it is written as L.A.H.R.). The heavy rain defined in this study is high intensity rain at the beginning and the end of the period including 2 hours of no rainfall. Here, heavy rainfall is defined as rainfall of 15 mm/h or more, and no rainfall is rainfall less than 0.5 mm/h. The characteristics of rainfall duration (td) and rainfall intensity ( i= RH/td, RH: cumulative heavy rainfall) were analyzed for the events of remarkable heavy rainfall. As a result, the duration (td)of H.A.H.R., A.H.R. and L.A.H.R. are estimated to be 3 to 12 hours, 12 to 36 hours, 36 to  xhours, respectively. The upper limits of rainfall intensity ( i) of these three types of heavy rainfall were estimated to be 70 mm/h, 36 mm/h and 20 mm/h, respectively.

Language: en

Keywords

activity; classification; disaster; name; three types of heavy rainfall; 名称; 継続時間; 豪雨の分類; 豪雨強度; 豪雨災害