Paper

Evaluation of the danger of debris‐flow torrents in view of the effect value of measure constructions using Support Vector Machine

Hiroyuki OHISHI, Yeboon YUN, Hirotaka NAKAYAMA and Kohei FURUKAWA　　3

Bed variation model considering porosity change in riverbed material
　　 Muhammad SULAIMAN, Masaharu FUJITA and Daizo TSUTSUMI　11

A study of accuracy verification and practicality of riverbeds gravel investigation method using low altitude aerial photograph

Ken‐ichi UMEZU and Osamu TOMATSU　19

 

Technical Reports

Characteristic of hot ash clouds movement and deposition after separation from it's main body of lava dome collapse‐induced pyroclastic flow

Takashi YAMADA　29

Research Notes

Applicability of a new rainfall index R′ for recent cases and proposal of the method for warning against sediment‐related disaster
　　　Shinji NAKAI, Masahiro KAIBORI, Yasushi SASAKI and Takeo MORIWAKI　37

Bursting process of a landslide dam caused by Typhoon 0514 (Nabi) in the Mimi River, Miyazaki Prefecture, Japan, and suggestions regarding evacuation procedures when a landslide dam bursts
　　　Miki CHIBA, Toshio MORI, Tathuo UCHIKAWA, Takahisa MIZUYAMA and Yoshifumi SATOFUKA　43

 

Technical Notes