2009 Fiscal Year Final Research Report
Low-Flow Channel Variation and Effects of Grain Sorting due to Sediment Augmentation
Project/Area Number |
19560521
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
水工水理学
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Research Institution | Maizuru National College of Technology |
Principal Investigator |
MIWA Hiroshi Maizuru National College of Technology, 建設システム工学科, 准教授 (70190832)
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Project Period (FY) |
2007 – 2009
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Keywords | 低水路 / 河床低下 / 流路変動 / 混合砂礫 / 分級 / 置き土砂 / 側岸侵食 / 平面二次元河床変動計算 |
Research Abstract |
A sediment replenishment technology has been developed which involves the conveyance of part of the sediments excavated and/or dredged from reservoirs to the river below the corresponding dam. This technology has been implemented on a trial basis in several dam. However, this technique is in the development stage because there are many unknown factors. Therefore, systematic investigations are necessary in order to enable practical implementation and management of this technology. In this study, the effects of the location of replenished sediment on sediment flushing and on control of degradation are investigated by means of flume experiments and two-dimensional numerical simulations. The effects of grain size distribution (uniform and non-uniform sediments) on them are also discussed. The flushing process of replenishment sediments were investigated first, and then its effect on river bed degradation was analyzed.
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Research Products
(9 results)
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[Remarks] Miwa, H.: Effects of sediment supply on low-flow channel formation, and its variation due to sediment augmentation, Environmental Hydrology and Hydraulic Engineering seminar, Invited Lecture, Apr. 16, 2010, University of Illinois.
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[Remarks] 三輪浩:置き土による土砂供給と水みちへの影響,砂防オープンゼミ,2009年7月11日,京都大学.
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[Remarks] Miwa, H.: Effect of sediment supply conditions on low-waterway formation, International Seminar for hydrological studies on carbon and nutrient, Nov. 26, 2007, University of Hyogo.
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[Remarks] 三輪浩:仮置き土砂供給による低水路の変動特性,「河川構造物等に作用する流体力と流れ」研究分科会,2007年11月2日,京都大学穂高砂防観測所.