Paper

Evaluation of gravel and sand found on stream preservation works of Neo‐Natural River Reconstruction Method after the improvement

Ken‐ichi UMEZU and Osamu TOMATSU 3

Difference of the sediment yield characteristics with vegetation recovery in granite watershed
　　 Tetsushi ITOKAZU, Yuichi ONDA, Takeshi OHTA, Hiroaki SUGIMORI and Hirofumi SHIBANO　11

Technical Report

Sediment discharge observation and its analysis by means of a hydrophone in the upper Tedorigawa river basin
　　　Hiroaki NAKAYA, Kenji TSURUTA and Nobuya YOSHIMURA　20

Research Notes

A study on critical rainfalls triggering off debris flow
　　　Akihiko IKEDA, Takahisa MIZUYAMA and Katsunori HARAGUCHI　26

A study on the evaluation of trees' effect of reducing slope failure sediment movement in a buffer forest zone
　　　Toshitaka KIDOWAKI, Masanori KANEKO and Hideki TERADA　32

Characteristics of large woody debris transportation and deposition by rainfall in the Kanaso Creek, Miyake Island
　　　Kota KIKUCHI, Yoshiharu ISHIKAWA and Katushige SHIRAKI　38

The Tobata landslide dam and outburst floods at the Azusa River in 1757
　　　Toshio MORI, Kimio INOUE, Takahisa MIZUYAMA and Toshiyasu UENO　44