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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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 |
work_keys_str_mv |
AT dodoricobenitespe landslidedamandoutburstoftheriosantacruzmainandes3140sprovinceofsanjuan AT perezdj landslidedamandoutburstoftheriosantacruzmainandes3140sprovinceofsanjuan AT sequeirn landslidedamandoutburstoftheriosantacruzmainandes3140sprovinceofsanjuan AT fauquel landslidedamandoutburstoftheriosantacruzmainandes3140sprovinceofsanjuan |
_version_ |
1769810307786473472 |