Adaptação do fator geomorfológico na metodologia de mapeamento da vulnerabilidade à perda de solos
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2021-02-05
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Universidade Federal de Goiás
Resumo
The present work starts from the observation of scientific works that used the methodology of mapping the vulnerability to soil loss by Crepani et al. (2001), and questions about the adaptation or lack of analysis factors that are part of this methodology. Observing these works, it was found that most authors fail to apply or substitute geomorphological factors such as altimetric amplitude and horizontal dissection, using only the slope, differently from what is proposed by the methodology. With this, the work proposes the adaptation of the altimetric amplitude factor, replacing it with the vertical distance to the nearest drainage, called HAND, which is also applied to the mapping of land use aptitudes and the mapping of areas of susceptibility. The HAND as a method of hydrological modeling is studied as a predictor of susceptibility to hydrological disasters such as wet mass landslides and flooding. With this in mind, the main objective of the work is to propose an adaptation of the geomorphological factor of the methodology for vulnerability to soil loss, by Crepani et al. (2001). The work structure is divided into 4 sessions, the first with the theoretical framework, the second showing the applied methodology, the third session with the results and discussions and finally the final considerations about the work. The methodology was divided into two fronts, a bibliographic survey about subjects that encompass the research, as well as applications of the methodology of vulnerability to soil loss and data processing through secondary data, compilation of thematic maps and use of orbital images for the generation maps of land use and geomorphometric elements of the relief, using GIS programs. As a main result, the good response obtained by the application with the HAND model is evidenced, which presented values consistent with the study area and also results dose to those of the altimetric amplitude map, used as a comparison and observation factor. Through these points, two final maps were drawn up, the environmental vulnerability to soil loss, using the land use and cover map and the natural vulnerability to soil loss, using the vegetation factor, as evidenced by the vegetation cover . With the result of these two mappings, it was found that the hydrographic basin of the Peixe River, considered as the application area of the methodology, presented significant areas of moderately stable / vulnerable vulnerability, which according to the analyzes the main factor of this degree are the agricultura! activities and the incorrect handling of the soil, allied to some locations of busy reliefs and types of rocks and soils. As final considerations, it is possible to say that this work provides support for the application of this adaptation in other hydrographic basins, and socioeconomic factors can also be implemented for possible studies of Economic Ecological Zoning.
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TAVARES, K. S. R. Adaptação do fator geomorfológico na metodologia de mapeamento da vulnerabilidade à perda de solos. 2021. 106 f. Dissertação (Mestrado em Geografia) - Universidade Federal de Goiás, Goiânia, 2021.