Comparison between the integrated and parametric analyzes in the study of landslides suceptibility in pipilenes around: Orbel pipelines strip, Rio de Janeiro State

Abstract

This research aimed the comparison between the Parametric Approach, conducted through the overlay of weighted maps, and the Integrated one, anchored in the photo-interpretation of remote sensing images, to obtain the susceptibility to landslides using high resolution images. The study area has 108.6 km², is a stretch of the ORBEL pipelines strip in Rio de Janeiro State. The research steps involved: bibliographic data; production of the auxiliary maps: DEM; the Landslide Inventory Map, with a total of 165 identified features, generation of the Landslide Susceptibility Map – Physiographic Compartmentalization from photo-interpretation of satellite; and the Landslide Susceptibility Map – AHP (Analytic Hierarchy Process) obtained by the overlay of all maps in terms of weighted overlay methods. The comparison between the two susceptibility maps, with 4 classes, was carried out using cross tabulation and also a descriptive analysis. It was concluded that the Parametric Approach was more detailed and consistent, with a greater number of scars in the Very High and High Susceptibility classes. The integrated analysis, although more general, was sufficient for the production of the susceptibility map and can be an alternative for linear works of great extension, for not requiring maps in compatible scales, which is configured as a difficulty in the country. The two approaches may be complementary, with the Parametric Approach only in sections where detailing is necessary.