The Prevention Disaster Program of Flood in 2013 for the 4th Grade Students of Kawatanaka Primary School, Tokushima Prefecture, Japan and Underflow Channels Revealed in 2016

World Multidisciplinary Earth Sciences Symposium 2017

Kawamata, Sanae^1 ; Murata, Mamoru^2

Joint Graduated School, Science of School Education, Hyogo University of Teacher Education, Kato, Hyogo

673-1494, Japan^1

Department of Geosciences, Faculty of Science, Naruto University of Education, Naruto, Tokushima

772-8502, Japan^2

关键词: Current flows;    Educational program;    Heavy rains;    Natural disasters;    Primary schools;    River basins;    River levels;    Social study;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/95/2/022026/pdf
DOI  :  10.1088/1755-1315/95/2/022026

来源: IOP

【 摘 要 】

The Typhoon No. 18 caused flood on September 15, 2013 in the Kawata River basin, Yoshinogawa City, Tokushima Prefecture. The Kawata River is a raised river bed of 36.7 m with banks to 40.5 m above sea level. The heavy rain did not destroy the banks but made the river level 39.4 m high and then pressed the underflow channel. As the Kawatanaka primary school is located at 36.2 m height, it was not submerged although the underflow channel overbanked the adjacent playground. An educational program on the prevention and reduction for natural disaster, which consists of science, social studies and presentation, was conducted to 18 students of the 4th grade in the period of integrated study in the Kawatanaka primary school from September 17, 2013. On the first day, flow current markings from 625 holes, 30 cm to 1 mm in diameter, on the playground were observed. The flow currents showed direction from SE to NW. On the basis of their observations on the flow currents that water runs from high to low, the students considered the phenomena as a result of tilting of the ground. They conducted activity as their homework to confirm their hypothesis to know if there is any tilt in the ground. They took plastic bottle filled with water and reviled that the ground had 1 to 2 degrees' tilt to the NW during the experiment. On the bases of the difference between E to W flow of the Kawata River and their SE to NW estimated current flow on the playground and the fact that the bank of the river was not destroyed, the students suggested that the heavy rain had pressed the underflow channels. The suggested channels were found on the playground, where new school buildings were constructed in 2016, by one of the students who studied the program in 2013.