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| Titel |
Critical conditions of bed sediment entrainment due to debris flow |
| VerfasserIn |
M. Papa, S. Egashira, T. Itoh |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 4, no. 3 ; Nr. 4, no. 3 (2004-08-02), S.469-474 |
| Datensatznummer |
250001697
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| Publikation (Nr.) |
 copernicus.org/nhess-4-469-2004.pdf |
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| Zusammenfassung |
| The present study describes entrainment characteristics of bed material into
debris flow, based on flume tests, numerical and dimensional analyses. Flume
tests are conducted to investigate influences of bed sediment size on
erosion rate by supplying debris flows having unsaturated sediment
concentration over erodible beds. Experimental results show that the erosion
rate decreases monotonically with increase of sediment size, although
erosion rate changes with sediment concentration of debris flow body.
In order to evaluate critical condition of bed sediment entrainment, a
length scale which measures an effective bed shear stress is introduced. The
effective bed shear stress is defined as total shear stress minus yield
stress on the bed surface. The results show that critical entrainment
conditions can be evaluated well in terms of Shields curve using the
effective bed shear stress instead of a usual bed shear stress. |
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