Landslide dam and outburst of the Río Santa Cruz, Main Andes, (31°40S), province of San Juan

In the region of the Main Andes of San Juan, exists a high concentration of landslide deposits that can originate natural dams. The outburst of these dams generated by slide is a common process in this morphology. The analyses of satellite imagery and air photos of previous years allow reconstructin...

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Autores principales: D'Odorico Benites, P.E., Pérez, D.J., Sequeir, N., Fauqué, L.
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 2009
Materias:
dam
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v65_n4_p713_DOdoricoBenites
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spelling paperaa:paper_00044822_v65_n4_p713_DOdoricoBenites2023-06-12T16:40:28Z Landslide dam and outburst of the Río Santa Cruz, Main Andes, (31°40S), province of San Juan Rev. Asoc. Geol. Argent. 2009;65(4):713-724 D'Odorico Benites, P.E. Pérez, D.J. Sequeir, N. Fauqué, L. Cordillera frontal Flood Landslide dam Main andes Outburst San juan aerial photograph dam erosion rate flooding geomorphological response hazard assessment landslide monitoring system mountain region outburst satellite imagery slope dynamics slope failure uplift Andes Argentina San Juan [Argentina] Santa Cruz [Argentina] Santa Cruz River [Santa Cruz] In the region of the Main Andes of San Juan, exists a high concentration of landslide deposits that can originate natural dams. The outburst of these dams generated by slide is a common process in this morphology. The analyses of satellite imagery and air photos of previous years allow reconstructing the characteristics and the origin of the slides that formed those natural dams. In this region of the Main Andes, the rapid uplift and erosion of the mountain chain has created abrupt slopes and an internal structure in the materials that determined an increase of the susceptibility to the slope collapse without triggers as the seismic activity or precipitations. The objectives of the present work are (1) to analyze the causes that formed the natural dam and produced the landslide dam and development of the Los Erizos lagoon in the middle course of the Santa Cruz river; (2) the outburst of the dam and their consequent flood; and (3) the morphologic characteristic of the study region. The temporary comparison between air photos with satellite imageries indicates that the natural dam was generated by slip of the western hillside of the Santa Cruz mountain range, located below the Cerro Estrella. However, the constant water flow to the lagoon, has increased its water level until reaching the maximum benchmark of the dam, produced the beginning of the lake drainage and weakening of the dam causing the outburst and its consequent flood. Based on satellite imagery, a temporary analysis of the lagoon is presented, indicating that monitoring is an important tool to alert in the whole San Juan river basin for possible natural dikes, preventing hazards to the populations down water. The alluvium of November 12 of 2005, discharged 32.100.000 m3 in 67 minutes and traveled 254 km in less than 12 hours. Fil:Pérez, D.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Fauqué, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2009 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v65_n4_p713_DOdoricoBenites
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language Inglés
orig_language_str_mv eng
topic Cordillera frontal
Flood
Landslide dam
Main andes
Outburst
San juan
aerial photograph
dam
erosion rate
flooding
geomorphological response
hazard assessment
landslide
monitoring system
mountain region
outburst
satellite imagery
slope dynamics
slope failure
uplift
Andes
Argentina
San Juan [Argentina]
Santa Cruz [Argentina]
Santa Cruz River [Santa Cruz]
spellingShingle Cordillera frontal
Flood
Landslide dam
Main andes
Outburst
San juan
aerial photograph
dam
erosion rate
flooding
geomorphological response
hazard assessment
landslide
monitoring system
mountain region
outburst
satellite imagery
slope dynamics
slope failure
uplift
Andes
Argentina
San Juan [Argentina]
Santa Cruz [Argentina]
Santa Cruz River [Santa Cruz]
D'Odorico Benites, P.E.
Pérez, D.J.
Sequeir, N.
Fauqué, L.
Landslide dam and outburst of the Río Santa Cruz, Main Andes, (31°40S), province of San Juan
topic_facet Cordillera frontal
Flood
Landslide dam
Main andes
Outburst
San juan
aerial photograph
dam
erosion rate
flooding
geomorphological response
hazard assessment
landslide
monitoring system
mountain region
outburst
satellite imagery
slope dynamics
slope failure
uplift
Andes
Argentina
San Juan [Argentina]
Santa Cruz [Argentina]
Santa Cruz River [Santa Cruz]
description In the region of the Main Andes of San Juan, exists a high concentration of landslide deposits that can originate natural dams. The outburst of these dams generated by slide is a common process in this morphology. The analyses of satellite imagery and air photos of previous years allow reconstructing the characteristics and the origin of the slides that formed those natural dams. In this region of the Main Andes, the rapid uplift and erosion of the mountain chain has created abrupt slopes and an internal structure in the materials that determined an increase of the susceptibility to the slope collapse without triggers as the seismic activity or precipitations. The objectives of the present work are (1) to analyze the causes that formed the natural dam and produced the landslide dam and development of the Los Erizos lagoon in the middle course of the Santa Cruz river; (2) the outburst of the dam and their consequent flood; and (3) the morphologic characteristic of the study region. The temporary comparison between air photos with satellite imageries indicates that the natural dam was generated by slip of the western hillside of the Santa Cruz mountain range, located below the Cerro Estrella. However, the constant water flow to the lagoon, has increased its water level until reaching the maximum benchmark of the dam, produced the beginning of the lake drainage and weakening of the dam causing the outburst and its consequent flood. Based on satellite imagery, a temporary analysis of the lagoon is presented, indicating that monitoring is an important tool to alert in the whole San Juan river basin for possible natural dikes, preventing hazards to the populations down water. The alluvium of November 12 of 2005, discharged 32.100.000 m3 in 67 minutes and traveled 254 km in less than 12 hours.
format Artículo
Artículo
publishedVersion
author D'Odorico Benites, P.E.
Pérez, D.J.
Sequeir, N.
Fauqué, L.
author_facet D'Odorico Benites, P.E.
Pérez, D.J.
Sequeir, N.
Fauqué, L.
author_sort D'Odorico Benites, P.E.
title Landslide dam and outburst of the Río Santa Cruz, Main Andes, (31°40S), province of San Juan
title_short Landslide dam and outburst of the Río Santa Cruz, Main Andes, (31°40S), province of San Juan
title_full Landslide dam and outburst of the Río Santa Cruz, Main Andes, (31°40S), province of San Juan
title_fullStr Landslide dam and outburst of the Río Santa Cruz, Main Andes, (31°40S), province of San Juan
title_full_unstemmed Landslide dam and outburst of the Río Santa Cruz, Main Andes, (31°40S), province of San Juan
title_sort landslide dam and outburst of the río santa cruz, main andes, (31°40s), province of san juan
publishDate 2009
url http://hdl.handle.net/20.500.12110/paper_00044822_v65_n4_p713_DOdoricoBenites
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AT sequeirn landslidedamandoutburstoftheriosantacruzmainandes3140sprovinceofsanjuan
AT fauquel landslidedamandoutburstoftheriosantacruzmainandes3140sprovinceofsanjuan
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