Rain score and debris flow occurrence criterion in case of mizunashi river, shimabara
Technology reports of the Yamaguchi University Volume 5 Issue 2
Page 51-59
published_at 1993-12
Title
Rain score and debris flow occurrence criterion in case of mizunashi river, shimabara
Creators
Shiotsuki Yoshiharu
Creators
Yamamoto Tetsuro
Creators
Shibasaki Kazuya
Creators
Inoue Masayuki
Source Identifiers
Debris flow occurrence at Mizunashi river of Mt. Unzen, Shimabara, Nagasaki prefecture, is discussed with the various factors obtained from the parameters a, b of rainfall intensity maxima curve. The maximum instantaneous intensity (R0) and the space liquid water content (M10) of the maximum 10 minute rainfall intensity (R10) are recognized important factors as well as the maximum 3 hour rainfall (R180). In case of R0>21.4mm, M10>0.8g/m^3, and R180>38mm, the debris occurrence probability is 90.9%. This paper proposes the rain score P as a new factor representing the rain strength. 8 significant debris occurrences including 5 flooded cases occur without exception in case of P≧5. The criteria are useful for the voluntary disaster prevention activity with the aid of 1-3 hour rainfall amount forecast.
Languages
eng
Resource Type
departmental bulletin paper
Publishers
山口大学工学部
Date Issued
1993-12
File Version
Version of Record
Access Rights
open access
Relations
[ISSN]0386-3433
[NCID]AA0086073X
Schools
工学部