ASSESSMENT OF ICE-DAM COLLAPSE BY TIME-LAPSE PHOTOS AT THE PERITO MORENO GLACIER, ARGENTINA

LENZANO MARIA GABRIELA; ESTEBAN LANNUTTI; TOTH CHARLES; LOVECCHIO ANDRÉS

ISPRS- International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences

ISPRS

Año: 2014 vol. XL p. 211 - 217

2194-9034

This research provides a feasibility study on the implementation and performance assessment of time-lapse processing of amonoscopic image sequence, acquired by a calibrated camera in the Perito Moreno Glacier in Argentina. The glacier is located at 50°28? 23??S, 73° 02? 10??W at the Parque Nacional Los Glaciares, South Patagonia Icefield, Santa Cruz and has experienced minorfluctuations and unusual behavior since the early 1960?s to present. The objective of this study was to determine the evolution andchanges in the ice-dam of the Perito Moreno glacier that started on November, 23 2012 and collapsed on January 19, 2013. Twoimages every 24 hours were acquired since October 2012 until February 2013, a total of 135 days. Image information was supportedby ground data. Image and ground data was correlated with a 2D affine transformation. This technique allows the determination ofthe distortions in the images and estimating the values of scale factors. This, along with an accurate time-lapse interval, has producedaccurate data for the analysis. In addition, changes in the level of the Brazo Rico lake were validated with direct data in order todetermine the degree of uncertainty in the estimation of changes in the glacier. Based on the calculations, advance rates of the frontof the Perito Moreno glacier were estimated at 0.67m/d ±0.003m, and the tunnel evolution was also recorded.