Title:
|
Elaboration of a magnitude-frequency relationship for debris flows by aerial photographs: case study from a national park in the Spanish Pyrenees
|
Author:
|
Hurlimann Ziegler, Marcel; Chevalier, Guillaume Gerard; Moya Sánchez, José; Abanco Martínez de Arenzana, Claudia; Llorens, Marc
|
Other authors:
|
Universitat Politècnica de Catalunya. Departament d'Enginyeria del Terreny, Cartogràfica i Geofísica; Universitat Politècnica de Catalunya. MSR - Mecànica del Sòls i de les Roques |
Abstract:
|
Magnitude—frequency relationships provide essential information for landslide hazard
and risk analysis. A debris-flow inventory was created in the “Aigüestortes i Estany de Sant Maurici” National Park in the Central Pyrenees, Spain, by the interpretation of several sets of aerial photographs covering a time span of 53 years. 194 debris flows were detected, which provide a spatial density of 0.5 events per square kilometre. The areas affected by the debris flows range from ∼200 m2 up to 35000 m2. The magnitude—cumulative frequency curves include a strong rollover effect at about 2000 m2 and events larger than this magnitude can be represented by a power law with an exponent between −1.5 and −1.9. |
Subject(s):
|
-Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Riscos geològics -Debris avalanches -Esllavissades -- Pirineus |
Rights:
|
|
Document type:
|
Article - Published version Conference Object |
Published by:
|
CRC Press
|
Share:
|
|