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A total of 6667 landslides were confirmed in the period from 1965 to 2000 based on seven temporal pairs of aerial photographs. Both the occurrence\nof landslides and discharge into the dam lake affect sediment yield, indicating that\nfluvial systems in Miyagawa Dam catchment are supply-limited with respect to\nsediment. Sediment yields are not only affected by the initial failed volume of\nlandslides but also the mobility of landslides and debris flows. In Miyagawa Dam\ncatchment, percentages of landslides reaching channels varied from 56% in 1997–2000\nto 75% in 1976-1981, and were correlated with maximum hourly rainfall. In addition,\nthe mobility of debris flows was higher during periods with high maximum\ninstantaneous discharge compared to lower discharge, suggesting that the water content\nboth in initially failed materials and transported sediment controlled their mobility.\nTopography also affected the mobility of landslides/debris flows. 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Linkage of sediment supply and transport processes in Miyagawa Dam catchment, Japan
http://hdl.handle.net/2241/90988
http://hdl.handle.net/2241/90988e71dc9d7-e94a-47b0-aa3e-2e16c6efbc28
名前 / ファイル | ライセンス | アクション |
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JGR_112-F3.pdf (267.7 kB)
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Item type | Journal Article(1) | |||||
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公開日 | 2007-09-20 | |||||
タイトル | ||||||
タイトル | Linkage of sediment supply and transport processes in Miyagawa Dam catchment, Japan | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
著者 |
Imaizumi, Fumitoshi
× Imaizumi, Fumitoshi× Sidle, Roy C. |
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著者別名 |
今泉, 文寿
× 今泉, 文寿 |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Linkages between sediment supply by episodic geomorphic processes, obtained from aerial photographs and field surveys, and sediment transport, estimated from changes in sediment deposition behind a large dam, were investigated in the Miyagawa Dam catchment, central Japan. A total of 6667 landslides were confirmed in the period from 1965 to 2000 based on seven temporal pairs of aerial photographs. Both the occurrence of landslides and discharge into the dam lake affect sediment yield, indicating that fluvial systems in Miyagawa Dam catchment are supply-limited with respect to sediment. Sediment yields are not only affected by the initial failed volume of landslides but also the mobility of landslides and debris flows. In Miyagawa Dam catchment, percentages of landslides reaching channels varied from 56% in 1997–2000 to 75% in 1976-1981, and were correlated with maximum hourly rainfall. In addition, the mobility of debris flows was higher during periods with high maximum instantaneous discharge compared to lower discharge, suggesting that the water content both in initially failed materials and transported sediment controlled their mobility. Topography also affected the mobility of landslides/debris flows. For catchments >0.1 km2, the percentage of channel network length impacted by debris flows decreased with increasing catchment area due to reduced channel gradient. Thus, both the magnitude of rainfall-runoff events and catchment topography affect how landslide sediment contributes to sediment yield at the large catchment scale.Index terms: Hydrology (1800), Catchment (1804), Debris flow and landslides (1810), Hillslope geomorphology (1826); and Sediment transport (1862). Key words: landslide, debris flow, sediment budget, dam deposits, forest roads, and hillslope-channel linkages |
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書誌情報 |
Journal of geophysical research: Earth surface 巻 112, 号 F3, 発行日 2007-08-04 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0148-0227 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA11870087 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1029/2006JF000495 | |||||
権利 | ||||||
権利情報 | ©2007 American Geophysical Union | |||||
著者版フラグ | ||||||
値 | author | |||||
出版者 | ||||||
出版者 | American Geophysical Union | |||||
URI | ||||||
識別子 | http://hdl.handle.net/2241/90988 | |||||
識別子タイプ | HDL | |||||
シリーズ | ||||||
関連名称 | F03012 | |||||
フォーマット | ||||||
内容記述タイプ | Other | |||||
内容記述 | application/pdf |