Identificación, mapeo y análisis cuantitativo de los movimientos de masa en la cuenca del río Tartagal (Salta, Argentina) con datos de sensores remotos

CLAUDIA PAOLA CARDOZO; GUILLERMO TOYOS; VALÉRIE BAUMANN

João Pessoa-PB

Simposio; XVII Simpósio Brasileiro de Sensoriamento Remoto; 2015

Instituto Nacional de Pesquisa Espaciais (INPE)

The mass movements are those movements of rock, earth and debris down slope under the force of gravity. The hazard analysis and risk management begin with detection and mapping, which provides a basis for understanding their spatial and temporal occurrence. Mass movements are common in the Sierras Subandinas(Northwest of Argentina), where for the past 50 years there have been several events that resulted in loss of human lives and material damages in the communities living nearby. This study presents the first inventory map of mass movements for Tartagal river basin (Salta, Argentina) using Remote Sensing data. Identification and mapping of mass movements of the event 2009, was obtained from a supervised classification (maximum likelihood algorithm) of 10 m multi-spectral SPOT-4 imagery, acquired immediately after the event. The affected area was about 3 km2; the volume of material removed was about 2 km3 and the magnitude of the event was about 6,3. Automatic classification based on the spectral signature of the pixel, with the assistance of expert knowledge, proved to be a useful method for identifying and mapping mass movements, because it allowed a quick and efficient location. Mass movement inventory map and quantitative data will be useful for future hazard and risk assessments. They may also be used as a planning tool, and to implement mitigation strategies and risk reduction.