2013 Fiscal Year Final Research Report
Quantifying potential of sediment yield from mountainous watersheds by terrestrial cosmogenic nuclides
| Project/Area Number |
23710208
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Natural disaster science
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| Research Institution | Kyoto University |
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Principal Investigator |
MATSUSHI Yuki 京都大学, 防災研究所, 准教授 (90596438)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 宇宙線生成核種 / 削剥速度 / 侵食 / 加速器質量分析 / 土層形成速度 / 流域 / 土砂生産 / 地理情報システム |
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| Research Abstract |
Denudation rates of hillslopes and mountainous watershed were determined by terrestrial cosmogenic nuclides produced by cosmic-ray irradiation onto the Earth's land surfaces. Soil production rates on hillslopes and spatially-averaged denudation rates of watersheds were calculated to 10-1000 g/m2/yr and 100-10000 g/m2/yr, by accelerator mass spectrometry of nuclides in saprolite beneath soil layer and fluvial sediments collected at outlet of the watersheds, respectively. In high-relief steep mountainous terrains, denudation rates exceed soil production rates, implying a significant contribution of bedrock landsliding to denudation and hence landscape evolution.
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