El deslizamiento de rocas y detritos sobre el río Santa Cruz y el aluvión resultante por el colapso del dique natural, Andes Centrales de San Juan

PERUCCA, L. P. Y ESPER ANGILLIERI, M. Y

Revista de la Asociación Geológica Argentinaa

Asociación Geológica Argentina

Lugar: Buenos Aires; Año: 2009 vol. 65 p. 571 - 585

0004-4822

Rock-debris landslide on Santa Cruz river and resulting flash flood by collapse of the natural dam, Central Andes of San Juan. During summer of 2005, a large debris-rock slide occluded the Santa Cruz river valley, from the west slope of the Cordillera de Santa Cruz in southeast of San Juan province (S31º40´12´´; W70º16´18´´). The landslide originated a natural dam in Santa Cruz river and formed a lake of considerable volume. The 12th of November of 2005, probably by effect of the pressure generated by the same mass of water against the dam, the partial collapse of this natural dam took place, causing a violent and unexpected flash flood and generating several economic losses in the main localities of Calingasta department and considerable damages in one of the most relevant projects of the San Juan province, Caracoles dam, developed in the San Juan river. Because of the high costs of taking physical remediation measures to the natural dam in this very farest and almost inaccessible mountain area, the main protective measures that must be undertaken are the installation of a flood early warning system downstream, the hydrological monitoring at the dam and an annual satellital monitoring to see the evolution of the mass movement.