Papers

Spatial distributions of pore water pressure and effective stress in vertical seepage flow through multi-layer soil structure
　　　Fumitoshi IMAIZUMI and Kuniaki MIYAMOTO　　3

Resistance force of laterally spread tree roots in Japanese cypress and cedar forests
　　　Atsuhiko KINOSHITA, Yusuke SAKAI, Ryoichi OHNO, Saburo TABATA, Masateru KAWASHIMA and Takanari YAMASAKI　　11

Technical Report

Method for processing an erosion rate equation in numerical simulation of debris flow
　　　Takuro SUZUKI　　21

Research Notes

Sediment-related disasters in the Nakajo River watershed in Sakae Village, Nagano Prefecture triggered by the earthquakes in Northern Nagano Prefecture on March 12, 2011
　　　Shinya HIRAMATSU, Taijiro FUKUYAMA, Kazuki MATSUMURA, Akihiko IKEDA, Masayuki MIYASAKA and Yoshihiro HOSOKAWA　　29

Resistance force of laterally spread tree roots-lateral root modeling
　　　Atsuhiko KINOSHITA, Yusuke SAKAI, Ryoichi OHNO, Saburo TABATA, Masateru KAWASHIMA and Takanari YAMASAKI　　35

Technical Notes

Proposition of simple cone-penetration test measurement and slope conservation countermeasures −A case study of debris disaster caused by heavy rain in North Kanagawa, September 2010−
　　　Toshihiko SHIMOGAWA, Hideki INAGAKI, Hideki KOSAKA and Takafumi UZAWA　　41

An example of application of the aerially-placable floating water-stage gauge to landslide dams in Kii Peninsula caused by Typhoon Talas in 2011
　　　Takao YAMAKOSHI, Tadanori ISHIZUKA, Yosuke ITO, Seiichi OSAKA and Atsushi NAKAGOME　　45

Estimation of the rainfall causing overflow by use of water level of natural dams （Case study of natural dams occurred by typhoon No. 12 at 2011）
　　　Miki CHIBA and Takahisa MIZUYAMA　　50