Geomorfologia fluvial e o Megadesastre’11 do Córrego Dantas, Nova Friburgo (RJ): trajetórias, ajustes e mudanças.

Abstract

In the context of the worsening of global environmental changes, with the increase of extreme climatic events, this issue becomes increasingly relevant. In this sense, what should one expect from river responses to extreme climatic events, especially when the river system is related to mountainous regions? The research was developed around analyzes of the geomorphological changes and geomorphological adjustments that took place in the Dantas Stream, Nova Friburgo (RJ), based on the geomorphological responses resulting from the event of great magnitude that occurred between January 11th and 12th, 2011, known as Megadesastre'11. The conceptual approach of the research sought to provide a scientific understanding of geomorphology to interpret the responses of mountainous fluvial systems to large sediment entrances and to explain their role in the dynamics of behavior and changes of sediments. In order to reach the proposed objectives, the methodology was based on three axes: (1) Characterization and analysis of the regional and local controls of the basin; (2) Evaluation of the trajectory of adjustments and geomorphological and anthropic changes operated in the Dantas stream, after Magadesastre '11; (3) Synthesis analysis of the trajectory of geomorphological changes in the Dantas stream. It was concluded, in general, that during this period, the process of the reestablishment of conditions is similar to those verified in the pre-disaster reference state occurred. In some stretches, more resilient stretches, the rivers returned to their behavior without