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(Article of periodic en Anglais - 2006)

Document title

Estimation of magnitudes of debris flows in selected torrential watersheds in Slovenia

Authors(s) and Affiliation(s)

SODNIK J. ; MIKOŠ M. ;

Abstract

In this paper the application of different methods for estimation of magnitudes of rainfall-induced debris flows in 18 torrents in the upper Sava River valley, NW Slovenia, and in 2 torrents in Pohorje, N Slovenia is described. Additional verification of the methods was performed in the torrential watersheds with active debris flows in the recent past (Predelica and Brusnik in the Soča River basin, W Slovenia). For some of the methods, the knowledge of morphometric characteristics of a torrential watershed, torrential channel and torrential fan is enough. For other methods, a mathematical tool (HEC-HMS) had to be applied in order to develop a hydrologic run-off model of precipitation that can trigger debris flows. Computed debris-flow magnitudes were of the order between 6,500 m3 and 340,000 m3. Their values are a function of torrential watershed parameters, such as : watershed area, Melton number, fan gradient, and torrential channel gradient. The investigated fans were classified into 3 groups with regard to the debris-flow hazard : debris-flow with low possibility). A limit between debris-flow fans and torrential fans is proposed : Melton number 0.3 and torrential fan gradient 4°, that is 7%. Out of 24 investigated torrential fans, 13 fans were classified into the group of debris-flow fans, 5 fans were classified into the group of torrential fans, and the rest 6 fans were classified into the group of transitional fans. - (IKR)

Source

Article of periodic

published at : Acta geographica Slovenica / ISSN 1581-6613

Editor : SLOVENIE

Millesime : 2006, vol. 46, no1 [pp. 93-123]

Bibliographic references : 26 ref.

Collation : Illustration ;

Language

Anglais

Localisation

Réseau PRODIG - Paris

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2007.
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