Zoneamento geológico-geotécnico de porção da região da Costa Verde-RJ, escala 1:10.000

Abstract

Engineering geological zoning of portion of the Costa Verde region–RJ, Scale 1:10,000. This work presents procedures and results of studies related to the Engineering Geological Mapping and gravitational mass movement processes carried out in an area with 60 km 2 , being 41 km 2 on hillside and 19 km 2 on plains. It is located in the Costa Verde region, state of the Rio de Janeiro, in the municipalities of Itaguai and Mangaratiba. The study was developed in three distinct stages: definition of the attributes, collecting of the data and analysis of the results. As result of the engineering geological mapping six maps were elaborated: rock substrate, unconsolidated materials, slope shape, slope gradient, direction of the slope gradient and land uses. The rainfall data of the last 17 years were obtained. The inventory of the features of gravitational mass movements was elaborated in accordance with the criteria defined by UNESCO, and was registered 140 features, consisting of 5 categories: translational landslides, falls, boulder rolling, flows and creep. About 49% of these features had not suffered human influence. A bivariate analysis was carried out considering the environmental data obtained during the engineering geological mapping and inventory of the features occurred in the area.