Landslide dams are common phenomena world-wide and, in this paper, the results of the main inventories from bibliographic review have been examined in order to better define those variables that control their evolution. Not all landslides are capable of blocking a river channel, but only those ones that can carry a great amount of material characterized by velocities ranging between high (>5 m/s) to moderate (>13 m/month). Of course geotechnical properties of the material forming landslide dams exert a control on their stability. In this paper results obtained by a classification of dam debris depending on parent rocks in which landslide developed, are presented. The last part of the paper shows improvements to the theory, proposed by previous authors, that landslide dam evolution can be forecasted by defining geomorphic indexes that result from the combination of variables identifying both dam and dammed river. In particular the dimensionless blockage index (Ib’), expressed as Ib’=Log(Vd/A×Hd), based on an analysis that took into account 83 episodes, resulted a useful tool to make accurate predictions.

Criteria for a preliminary assessment of landslide dams evolution / Ermini L.; Casagli N.. - STAMPA. - (2002), pp. 157-162. ((Intervento presentato al convegno 1st European Conference on Landslides tenutosi a Prague, Czech Republic nel 24-26 June 2002.

Criteria for a preliminary assessment of landslide dams evolution

ERMINI, LEONARDO;CASAGLI, NICOLA
2002

Abstract

Landslide dams are common phenomena world-wide and, in this paper, the results of the main inventories from bibliographic review have been examined in order to better define those variables that control their evolution. Not all landslides are capable of blocking a river channel, but only those ones that can carry a great amount of material characterized by velocities ranging between high (>5 m/s) to moderate (>13 m/month). Of course geotechnical properties of the material forming landslide dams exert a control on their stability. In this paper results obtained by a classification of dam debris depending on parent rocks in which landslide developed, are presented. The last part of the paper shows improvements to the theory, proposed by previous authors, that landslide dam evolution can be forecasted by defining geomorphic indexes that result from the combination of variables identifying both dam and dammed river. In particular the dimensionless blockage index (Ib’), expressed as Ib’=Log(Vd/A×Hd), based on an analysis that took into account 83 episodes, resulted a useful tool to make accurate predictions.
Landslides - Proceedings of the First European Conference on Landslides
1st European Conference on Landslides
Prague, Czech Republic
24-26 June 2002
Ermini L.; Casagli N.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2158/383665
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