Vol. 76, No. 1, Ser. No. 366 May 2023
Contents
Papers
Numerical study on effect of soil structural development on hydrological processes
and stability in forest slopeBasic study of a method for measuring sediment concentration by image analysis
Yuki HAYASHI, Ken’ichiro KOSUGI, Masamitsu FUJIMOTO and Takahisa MIZUYAMA 3
Proto‐type experiments on dynamic response behavior of foundation and rockfall protection fence
when fence is subjected to impact loadDriftwood trapping function of a driftwood trap installed upstream of concrete closed dam
Fumio YAMASAWA, Masato KOMURO, Tomoki KAWARAI,
Norimitsu KISHI, Takuro NAKAMURA and Osamu HATAKEYAMA 11
Turbidity evaluation and debris flow detection method using unit vectors of
RGB values of stream surface images
: A case study of the Imokawa River, Shinano River system, Niigata Prefecture,
and the Kurodakesawa River, Ishikari River system, Hokkaido, Japan
Kazuhide IGARASHI, Akira MATSUOKA, Atsuhiko KINOSHITA and Takashi YAMADA 22
Research Note
Characteristics and modeling of bedrock spring runoff in a small catchment in granite mountains
Ikkei MATSUNAGA, Shin’ya KATSURA, Takahiko YOSHINO and Takamasa MATSUNAGA 34
Case study on the influence of periodic characteristics of seismic motion on coseismic landslide
using spectra of observed seismic waves
Yusuke SAKAI, Daisuke OHARA, Yuichi NAKASHIMA and Takao YAMAKOSHI 42
Technical Notes
Development of remote survey system for volcanic ash thickness in an access restriction area
Hiromichi KANAI, Jun MINAGAWA, Toru SHIMADA, Naomi NAGATA,
Ryota KITAHARA, Keiji NAGATANI, Yasushi HADA and Akira ZENIYA 50
A proposal for determining the influence of construction based on hydrologic observations
Takeharu SATO and Masaharu TAKADA 55