LIDAR application on hillslope instability.

LENZANO, MARÍA GABRIELA; MOREIRAS, STELLA MARIS; LENZANO, LUIS

Mendoza

Congreso; E-ICES-7. International Center for Earth Sciences; 2011

Landslide occurrence represents a hazard for dam stability as a sudden arrival of material may cause a drastic collapse of the dam. This dam failure generates abrupt emptying of lagoons that result in violent floods and debris flows causing extensive damage downstream. A rotational slide located in the western marine of the artificial reservoir of Potrerillos dam was study by LIDAR technique. This landslides was generated in the SW hillslope of Cocodrillo hill (1450 m asl) belonging to Cordón del Plata (Main Cordillera) in a continental sequence of Triassic rocks (Uspallata Group). These outcroppings involve fluvial and lacustrine-cineritic levels.   Terrestrial LIDAR Optech Ilris 3D was applied to determine the grade of activity of this hillslope collapse and sliding surface geometries. Slope topographic profiles were obtained. This method allowed to identify and distinguish detailed different characteristics of the hillslope, the advances of which may be monitored in the future in order to determine their activity. The use of this innovative method of data collection is relevant as, it allows to establish the necessary bases for monitoring these hillslopes with milimetrical accuracy in space and time.