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| Titel |
Sediment budget monitoring of debris-flow and bedload transport in the Manival Torrent, SE France |
| VerfasserIn |
J. I. Theule, F. Liébault, A. Loye, D. Laigle, M. Jaboyedoff |
| 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 ; 12, no. 3 ; Nr. 12, no. 3 (2012-03-23), S.731-749 |
| Datensatznummer |
250010616
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| Publikation (Nr.) |
 copernicus.org/nhess-12-731-2012.pdf |
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| Zusammenfassung |
| Steep mountain catchments typically experience large sediment pulses from
hillslopes which are stored in headwater channels and remobilized by
debris-flows or bedload transport. Event-based sediment budget monitoring in
the active Manival debris-flow torrent in the French Alps during a two-year
period gave insights into the catchment-scale sediment routing during moderate
rainfall intensities which occur several times each year. The monitoring was
based on intensive topographic resurveys of low- and high-order channels
using different techniques (cross-section surveys with total station and
high-resolution channel surveys with terrestrial and airborne laser
scanning). Data on sediment output volumes from the main channel were
obtained by a sediment trap. Two debris-flows were observed, as well as
several bedload transport flow events. Sediment budget analysis of the two
debris-flows revealed that most of the debris-flow volumes were supplied by
channel scouring (more than 92%). Bedload transport during autumn
contributed to the sediment recharge of high-order channels by the
deposition of large gravel wedges. This process is recognized as being
fundamental for debris-flow occurrence during the subsequent spring and
summer. A time shift of scour-and-fill sequences was observed between low-
and high-order channels, revealing the discontinuous sediment transfer in
the catchment during common flow events. A conceptual model of sediment
routing for different event magnitude is proposed. |
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