Debris-flow functioning and their contribution to sedimentary budgets : the Peynin subcatchment of the Guil River (Upper Queyras, Southern French Alps)

• Autorzy: Viel V. , Fort M. , Lissak C. , Graff K. , Carlier B. , Arnaud-Fassetta G. , Cossart E. , Madelin M.

Identyfikatory

DOI

10.12657/landfana.036.007

• Języki publikacji: EN

Abstrakty

EN

The Peynin catchment (15 km2) is prone to catastrophic floods (June 1957 – Recurrence Interval R.I.>100 yr), June 2000 (R.I.-30 yr) with serious damages to infrastructure and buildings located at the outlet. In this paper, PIT tags tracers and Vensim modelling software are used to better assess the sediment delivery unsteadiness, and more specifically to evaluate the respective role of geomorphological processes on sediment supply during flood event. For the last 20 years, our results highlight a significant variability in sediment delivery from a tributary to another one. According to our studies, we suppose that two torrential tributaries of the Peynin river, the Peyronnelle and Three Arbres subcatchments (<2 km2, representing <15% of the Peynin catchment area) are responsible of 80% of the sediments observed at the outlet of the catchment. Several processes take a part of these sediment transfers, but the efficiency of the sediment cascade in this catchment can be explained by a strong connectivity between sediment erosion area and the main channel of the catchment. Debris and torrential flows triggered during high intensity meteorological event are actually effectively coupled in space and time and guarantee an important sediment supply able to reload the downstream part of the sediment cascade. Recent climate trends, marked by extremes, suggest consequently more damaging events to come, in a context of increasing vulnerable assets.

Słowa kluczowe

EN

debris flow; passive integrated tracers; modelling; connectivity; environmental change; Southern French Alps

PL

modelowanie; łączność; zmiany środowiskowe; Południowe Alpy Francuskie

• Wydawca: Stowarzyszenie Geomorfologów Polskich
• Czasopismo: Landform Analysis
• Rocznik: 2018
• Tom: Vol. 36
• Strony: 71--84
• Opis fizyczny: Bibliogr. 48 poz., rys.

Twórcy

autor

Viel V.

• Department of Geography, UFR GHES, Université Paris-Diderot (Paris 7), Paris, France

autor

Fort M.

• Department of Geography, UFR GHES, Université Paris-Diderot (Paris 7), Paris, France

autor

Lissak C.

• Department of Geography, UFR SEGGAT, Université Caen Normandie, Caen, France

autor

Graff K.

• Department of Geography, UFR SEGGAT, Université Caen Normandie, Caen, France

autor

Carlier B.

autor

Arnaud-Fassetta G.

• Department of Geography, UFR GHES, Université Paris-Diderot (Paris 7), Paris, France

autor

Cossart E.

• Department of Geography and Management, Université de Lyon (Jean Moulin Lyon 3), Lyon, France

autor

Madelin M.

• Department of Geography, UFR GHES, Université Paris-Diderot (Paris 7), Paris, France

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