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Developaent of a successive flow monitoring system to elucidate the relationship of erosion, transportation and deposition of gravel controlled by flow-depth and velocity, and observation by the system.

Research Project

Project/Area Number 13640454
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Geology
Research InstitutionYamagata University

Principal Investigator

KAWABE Takayuki  Yamagata University, Faculty of Education, professor, 教育学部, 教授 (00214685)

Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 2002: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2001: ¥2,200,000 (Direct Cost: ¥2,200,000)
Keywordsmotion of gravel / movement of river bed / EasyQ / fablic / 侵食・運搬・堆積 / ドップラー流速計 / 礫質河川 / 乱川 / Easy-Q / 礫洲 / 河床形態 / 流速
Research Abstract

1.With a view to reveal the relationship between the relationship of erosion, transportation and deposition of gravel and the flow-depth and the flow-velocity, and to get continuous flow-data, we developed the River monitoring system by Nortec AS EasyQ doppler-type two dimensional monitoring stream, and made a continuous monitoring at the Midaregawa River in the Yamagata Basin, Northeast Japan.
2.There were a several flooding during July to November in 2002 and we corrected the data of flooding. At the largest flooding in July 10 to 11, caused by Typhoon 6Lh, when the velocity of the stream exceeded 2m/s, pebbles on the river bed began to move, and deposited on the monitoring system which was located along the side of the river margin when the velocity reached to 2. Sm/s. The maximum speed of the flow was estimated to be more than 3.5m/s. The gravels seemed to move with saltation and with elongating parallel to the flow direction, according from the fabric of gravels on the river floor. The monitoring system had malfuncitoned during high flooding stage (velocity was more than 2. Sm/a), and then evened out at waning stage of flooding. This means that the flow begins to incise the gravel river bed and deposit the gravels on the river margin when the velocity of the stream exceeds 2.5m/s, and is incising and depositing continuously during maximum flooding stage, then begins to erode laterally river margin at the stage of waning stage.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report

URL: 

Published: 2001-04-01   Modified: 2016-04-21  

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