(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)



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)


Article of periodic

published at : Acta geographica Slovenica / ISSN 1581-6613


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

Bibliographic references : 26 ref.

Collation : Illustration ;




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