警戒・避難のための雨量指標の改良 : 危険雨量指標R_fの再吟味とR'の提案

Improvement of Rainfall Index for Warning and Evacuation against Sediment-Related Disaster : Reexamination of the Rainfall Index R_f, and the Proposal of R'

Nakai Shinji

Sasaki Yasushi

Kaibori Masahiro

Moriwaki Takeo

広島大学大学院工学研究科研究報告

Graduate School of Engineering, Hiroshima University

Proper warning and evacuation are considered to be essential for mitigating sediment-related disaster during a heavy rainfall. For this purpose, scientific and rational rainfall index should be established in accord with the regional geology and topography. A new Rainfall Index, named R', is proposed through the revision of Rainfall Index R_f. Effect of preceding rainfall prior to a sediment-related disaster is taken into account for this newly proposed Rainfall Index R' by utilizing the concept of the effective rainfall. Rainfall records during the serious disaster happened to take place on 29 June, 1999 and 15 September, 1999 in Hiroshima district were taken as the cases to verify the effectiveness of this newly proposed Rainfall Index. As a result of the comparison between R_f and R', it was shown that R' is superior to judge the danger of sediment disaster for identifying an area and time from on-going rainfall.

Effective Rainfall

Preceding Rainfall

Rainfall Index

Preceding Rainfall

Warning and Evacuation

Earth sciences. Geology [ 450 ]

jpn

広島大学大学院工学研究科

国立情報学研究所

[ISSN] 1347-7218

[NCID] AA11700032