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( Daisuke Yamada ),( Tomoaki Nishikawa ),( Takuro Yoshikawa ),( Takayuki Kawai ),( Norihiro Kori ),( Mina Kobayashi ),( Masashi Kodan ),( Kohei Seto ),( Kumiko Yamashita ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
A heavy rainfall in July 2018 caused sediment disasters in West Japan. In this disaster, some debris flow were occured on slopes that were not recognized the potential of the occurence of sediment disasters. In this report, based on the results of the sediment disaster emergency survey conducted in several cities in West Japan, we will report the distribution and examples of slopes where these disasters occurred. In addition, regarding the occurrence of debris flow, the features related to topography and weather were examined. In Japan, the hazards of sediment disasters are recognized based on whether the topography of the slope has the same conditions as the topography of sediment disasters that occurred in the past. In this report, we focused on the debris flow occured on the slope that was not recognized as a valley where the debris flow occurs(the valley depth is wider than the valley width). As a result of this survey, we were able to understand the characteristics of the debris flow that occurred at a slope that was not recognized dangerous of sediment disaster. We believe that this report will help improve the warning and evacuation system for future sediment disasters in Japan.
Characteristics of Sediment Disasters that Occurred in Japan in Recent Years
( Kumiko Yamashita ),( Daisuke Yamada ),( Satoshi Watanabe ),( Hiroyuki Sawai ),( Tomoaki Nishikawa ),( Mina Kobayashi ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
In recent years, sediment disasters have been frequent in Japan triggered by heavy rainfall at typhoons and line-shaped rain band. When conducting a disaster survey, it is necessary to determine at first where the disaster is occurring and where the damage is large. In the case of sediment disasters that distribute wide area, it is effective to use aerial photograph to understand the disaster situation. We researched the characteristics of three cases of sediment disasters that occurred in Japan in recent years based on the result of the interpretation of aerial photographs taken just after disasters, and the detailed examination of field survey. The target sediment disasters are Typhoon No10 on August 2016, heavy rainfall in northern Kyusyu in July 2017, and West Japan heavy rainfall 2018. We report the characteristics of each sediment disaster from these results. These sediment disasters occurred in various types because the conditions under which these sediment disasters occurred were different, such as region, topography, geology, and rainfall. Understanding the differences of sediment disasters by region is considered to be important in order to reduce the damage caused by sediment disasters, such as the construction of erosion control facilities and the maintenance of a warning and evacuation system.
Seiji Nakashima,Hironori Fujisawa,Masaru Shimizu,Osami Sakata,Tomoaki Yamada,Hiroshi Funakubo,박정민,Takeshi Kanashima,Masanori Okuyama 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.31
An electric-field-induced strain at 80 K in a 350-nm-thick BiFeO_3 (BFO) thin film deposited by pulsed laser deposition has been investigated by a time-resolved x-ray diffraction under an electric field using a synchrotron radiation. A 300-nsec-width and 804.09-nsec-period voltage pulses were applied to the BFO thin film during the measurements. The time-resolved-x-ray diffraction profile around BFO (001) diffraction peak indicates that BFO (001) diffraction peak shifts to lower angle side during the voltage application. A strain estimated from the peak shift lineally increases with increasing the amplitude of the voltage pulses. A piezoelectric constant (d_(33)) of (001)-oriented domains in the polycrystalline BFO thin film at 80 K is 20.2 pm/V. The value is smaller than that measured at RT of 27.8 pm/V in our previous report.