Linkage of sediment supply and transport processes in Miyagawa Dam catchment, Japan
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概要
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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 occurrenceof landslides and discharge into the dam lake affect sediment yield, indicating thatfluvial systems in Miyagawa Dam catchment are supply-limited with respect tosediment. Sediment yields are not only affected by the initial failed volume oflandslides but also the mobility of landslides and debris flows. In Miyagawa Damcatchment, percentages of landslides reaching channels varied from 56% in 1997–2000to 75% in 1976-1981, and were correlated with maximum hourly rainfall. In addition,the mobility of debris flows was higher during periods with high maximuminstantaneous discharge compared to lower discharge, suggesting that the water contentboth in initially failed materials and transported sediment controlled their mobility.Topography also affected the mobility of landslides/debris flows. For catchments >0.1km2, the percentage of channel network length impacted by debris flows decreased withincreasing catchment area due to reduced channel gradient. Thus, both the magnitude ofrainfall-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, andhillslope-channel linkages
- American Geophysical Unionの論文
- 2007-08-04
American Geophysical Union | 論文
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