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Adaptation and implementation of a zoning model for mass movement susceptibility through of a geographical information system

Abstract:

The main purpose of this study is to adapt and apply a model for the zonation and analysis of the spatial distribution of susceptibility to mass movement, using multivaried statistics and Geographical Information System (GIS), as a methodological alternative for decision-making by governmental organizations and communities. Automatic spatial data analysis systems were used for processing, analysis and synthesis of the different variables (surface geology, geomorphology, terrain slope and use conflicts). These systems were the Vertical Mapper Module of MapInfo, used for handling of altimetric information, ArcShell to facilitate adjustment and ArcView for arrangement of the thematic layers and final map presentation. It was concluded that a) the adaptation of the original model, suggested by INGEOMINAS, Colombia, had an 80% coincidence with the photointerpretation of the studied event, in the central coast of Venezuela and, therefore, the calibration of the model was regarded as successful; and b) in the implementation of the modified model the zone of highest susceptibility to mass movement in the selected micro-basin is an area located in low terrain, where the so-called dissected slope hillsides geomorphological unit coincides with the Tacagua Schist Lithodeme, a mean slope range of 18-33%, and where there are no use conflicts.