EROSÃO EM FALÉSIAS COSTEIRAS E MOVIMENTOS DE MASSA NO RIO GRANDE DO NORTE, NORDESTE DO BRASIL

Coastal cliff erosion ans mass movements in Rio Grande do Norte, Northeastern Brazil

Abstract

The coast of the State of Rio Grande do Norte (RN) at the Northeast of Brazil is formed by sedimentary materials that form tablelands, dunes, cliffs and sandy beaches. The natural beauties of this area motivate occupation and tourist activities. This process of urbanization enhances mass movements, resulting from the increase of load, superficial erosion and removal of vegetation. Previous studies show that the coastline is in the process of retreat. This fact represents hazard to population and tourism industry. The present paper aims to better understand the mechanisms of mass movements and consequently seacliff retreat. Also, this research summarizes existing information, adds field observations and proposes a conceptual model that explains the mechanisms os failure and erosive processes identified. Additionally erosive processes are identified along the studied area. The main mechanisms identified are directly related to surface erosion, wetting of the material and basal erosion.