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Featured researches published by Daisuke Takabatake.


Coastal Engineering Journal | 2016

Improvement of Collision Force Formula for Woody Debris by Airborne and Hydraulic Experiments

Masaaki Ikeno; Daisuke Takabatake; Naoto Kihara; Hideki Kaida; Yoshinori Miyagawa; Atsushi Shibayama

The relationship between the collision direction angle and the collision force of woody debris and its behavior is investigated through large-scale bore flow and airborne experiments. In the case of the airborne experiments oblique collision angle being larger than 20°, the oblique collision force is reduced by up to half of the longitudinal collision force. In the case of the bore flow experiments initial arrangement along the transverse direction, the wood-log moved with a rotation along the channel floor. Collision forces in the bore flow experiment indicated the trend less than that in the airborne experiment. The effects of water cushioning between the wood-log and vertical wall, and the surrounding water caught by the rotation of debris were considered. Major collision force formulas for collisions in the long axis direction of woody debris are verified through comparison of this study and recent experiments. By considering the reduction in collision energy by the rotational motion of debris after oblique collisions, their collision force formulas are improved to estimate the oblique collision force. The improved formulas can reproduce the reduction of significantly oblique collision forces compared with longitudinal collision forces by the above experiments. The effect of the collision angles uncertainty on the estimation of the collision force was investigated as a case study on a probabilistic evaluation of the collision force.


Coastal Engineering | 2015

Large-scale experiments on tsunami-induced pressure on a vertical tide wall

Naoto Kihara; Yasuo Niida; Daisuke Takabatake; Hideki Kaida; Atsushi Shibayama; Yoshinori Miyagawa


Coastal Engineering Proceedings | 2014

REVISIT THE TSUNAMI HYDRODYNAMIC FORCE ON THE FRONT FACE OF ONSHORE STRUCTURE

Daisuke Takabatake; Naoto Kihara


The Twenty-fifth International Ocean and Polar Engineering Conference | 2015

Large Scale Experiments on Response of RC Tide Wall to Tsunami Debris Impact

Atsushi Shibayama; Naoto Kihara; Yoshinori Miyagawa; Daisuke Takabatake; Hideki Kaida


Journal of Japan Society of Civil Engineers | 2013

Numerical Study for the Hydrodynamic Pressure on the Front of Onshore Structures by Tsunami

Daisuke Takabatake; Naoto Kihara; Nobukazu Tanaka


The Twenty-fifth International Ocean and Polar Engineering Conference | 2015

A New Physical Flume of Tsunami-Inundation Flow

Naoto Kihara; Kazuyuki Ota; Daisuke Takabatake; Masafumi Matsuyama


Journal of Japan Society of Civil Engineers | 2013

A physical simulation method for tsunami inundation flow with arbitrary flow velocity and inundation depth

Kazuyuki Ota; Naoto Kihara; Takahiro Sato; Daisuke Takabatake; Masafumi Matsuyama; Takumi Yosii; Nobukazu Tanaka


Journal of Japan Society of Civil Engineers | 2013

Simple and Practical Estimation of Movement Possibility and Collision Force of Debris due to Tsunami

Masaaki Ikeno; Naoto Kihara; Daisuke Takabatake


Journal of Japan Society of Civil Engineers | 2017

FULL-SCASLE WATERBORNE AND AIRBORNE COLLISION EXPERIMENTS OF WOOD LOG

Hideki Kaida; Naoto Kihara; Daisuke Takabatake; Atsushi Shibayama; Yoshinori Miyagawa


Journal of Japan Society of Civil Engineers | 2015

LARGE-SCALE EXPERIMENTS ON QUASI-STEADY TSUNAMI PRESSURE AND HYDRODYNAMIC FORCE EXERTED ON THREE DIMENSIONAL CYLINDRICAL STRUCTURE.

Hideki Kaida; Naoto Kihara; Daisuke Takabatake; Yoshinori Miyagawa; Atsushi Shibayama

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Naoto Kihara

Central Research Institute of Electric Power Industry

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Yoshinori Miyagawa

Central Research Institute of Electric Power Industry

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Atsushi Shibayama

Central Research Institute of Electric Power Industry

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Hideki Kaida

Central Research Institute of Electric Power Industry

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Masaaki Ikeno

Central Research Institute of Electric Power Industry

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Kazuyuki Ota

Central Research Institute of Electric Power Industry

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Masafumi Matsuyama

Central Research Institute of Electric Power Industry

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Nobukazu Tanaka

Central Research Institute of Electric Power Industry

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Yoshiharu Shumuta

Central Research Institute of Electric Power Industry

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