2015 Fiscal Year Final Research Report
Establishment of sediment flux measurement and bathymetric survey system for river-sea estuary system
| Project/Area Number |
25420516
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Hydraulic engineering
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| Research Institution | University of Tsukuba |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
OKABE Takumi 豊橋技術科学大学, 工学研究科, 助教 (50464160)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | Ｘバンドレーダ / 河口砂州 / 河口テラス / 小型漁船 / 海底地形測量 / 出水 / 土砂フラックス |
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| Outline of Final Research Achievements |
Land based X-band radar and depth sounding device attached to small fishery boats have been employed to monitor continuously and robustly the morphologies at the river mouth of River Tenryu. X-band radar can scan the boundaries between sea and land borders, and can trace the distributions of river sand bar, river terrace etc. Depth sounders attached to fishery boats collect depths distributions from the river channel to the offshore coastal zone. Several flushing of river sand bar were observed during the study. Flushing is mainly due to the flood, however, sometimes the effect of wave motion became dominant. Position of the plan center of river sand bar was shifting to the river channel side during the study period with a speed of approximately 5 m/year. The river terrace decreased its volume drastically during the study period by 800,000 qubic meters. Both results suggest that the area is in an eroding environment and the morphology of the river mouth will change in the near future.
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| Free Research Field |
海岸工学
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