Erodibilidade de solos tropicais não saturados nos municípios de Senador Canedo e Bonfinópolis - GO
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2014-09-26
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Universidade Federal de Goiás
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Environment, socials and economics problems are related with erosive process, like: loss of soil productivity, silting of rivers and lakes, landslides in areas of risk and commitment of public services. Aspects such as climate, topography, soil type and the use and occupation of land by humans are decisive in understanding the susceptibility of a site to water erosion. However, in the case of tropical regions, two aspects have relative importance in studies erodibility: non saturation and weathering degree. In this way, the present study aims to analyze the suction effect and laterization degree in erodibility soil, emphasizing important parameters for carried out erodibility tests. Therefore, were selected two (02) areas near the city of Goiânia with distinct pedogenetic characteristics, one with younger soils (or even intermediate, as observed during the study) and another where weathering processes acted more intense, corresponding to a Cambisol soil type and a Oxisol type, respectively. In each site were collected disturbed and undisturbed samples with the aim to perform characterization tests, tropical soils tests, soil water retention curves and erodibility tests. On results were noted that both samples are a lateritic soils, presenting even primary minerals and iron oxides. The adjusting of soil water retention curves results on a bimodal shape for the Oxisol type due to the presence of micro and macropores, and with heterogeneous distribution shape for Cambisol Type, due the presence of grains on different sizes. At finally, the analysis of erosion, in general, results that the samples with lower initial suctions were more resistance to laminar erosions and in the processes of slope stability when submerged. On the Inderbitzen tests, the Oxisol showed be more susceptible to the erosive processes than the Cambisol type, probably because of the lower flow of the water. In the total and partial disintegration test, the samples of Oxisol demonstrate to be a good cohesive soil, opposite behavior have the Cambisol samples.
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ALMEIDA, João Guilherme Rassi. Erodibilidade de solos tropicais não saturados nos municípios de Senador Canedo e Bonfinópolis - GO. 2014. 133 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2014.