| Project/Area Number |
01302045
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| Research Category |
Grant-in-Aid for Co-operative Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Hydraulic engineering
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| Research Institution | Tohoku University |
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Principal Investigator |
SAWAMOTO Masaki Tohoku Univ., Civil Eng., Professor, 工学部, 教授 (90016519)
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| Co-Investigator(Kenkyū-buntansha) |
NAGABAYASHI Hisao Nihon Univ., Civil Eng., Assis. Professor, 工学部, 専任講師 (70102431)
MAEKAWA Katsuro Yamagata Univ., Agri. Eng., Assoc. Professor, 農学部, 助教授 (40007076)
ISHII Chimataro Akita Univ., Civil Eng., Assoc. Professor, 鉱山学部, 助教授 (80006676)
HIRAYAMA Ken-ichi Iwate Univ., Civil Eng., Professor, 工学部, 教授 (10001140)
SASAKI Mikio Hachinohe Inst. Tech., Civil Eng., Assoc. Professor, 助教授 (30118195)
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| Project Period (FY) |
1989 – 1990
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| Keywords | Tohoku District / River Mouth Process / Iwaki River / Abukuma River / Mogami River / Medium And Small Rivers / Nanakita River / River Mouth Sand Barrier |
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| Research Abstract |
Hydraulic and topographical characteristics of river mouth in Tohoku district were surveyed under the cooperation of the universities in six prefectures. The rivers surveyed are as follows :
Aomori : Iwaki R. (stability and hydraulics at river mouth), Takase R. (water quality and hydraulics), Mabechi R. (topography change) and Niida R. (hydraulics)
Iwate : 42 rivers on Sanriku Coast (Comparison of topography)
Akita : Yoneshiro R. (topography change), Omono R. (topography change) and Koyoshi R. (river mouth process)
Miyagi : Nanakita R. (river mouth process) and Abukuma R. (river mouth process)
Yamagata : Mogami R. (topography change) and Aka R. (topography change)
Fukushima : 36 small rivers (comparison of topography)
Both the literature and the field survey were carried out for all rivers. Two gatherings were performed in order to discuss the comparison of each river at Jusanko, the Iwaki River mouth, 1989, and at Yunohama, near the Mogami River mouth and the Aka River mouth, 1990.
The most important results obtained is that the scale of river controls phenomena observed at river mouths. For example, the topography change observed in large scale river varies over some years. On the other hand, the topography of small river varies according to annual variation of river flow.
It was also confirmed that the further field survey may need to reveal the mechanism of river mouth process.
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