Migração dos meandros do baixo curso do rio Claro, Goiás: processos e fatores controladores
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2015-06-24
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Universidade Federal de Goiás
Resumo
Meanders rivers have sinuous channel with singular dynamic of lateral migration by eroding its
concave bank and depositing on its convex bank. This dynamic is able to expand and restore
fluvial environments when creates a sedimentary environments complex linked to development
of floodplain. The nature of preexistent deposits on floodplain, which are remobilized by lateral
migration, is important to interpret deposicional dynamics, being central to the identification
evolution of meanders. Heterogeneity of the facies is formed by several cycles of sedimentary
evolution through channel migration, generating a succession of deposits with different degree
cohesion. These depositional environments affect the continuity migration and the evolution of
meanders. It was researched the current evolution of meander and riparian vegetation influence
and theirs deposit about lateral migration process on downstream Claro river. It was used aerial
photographs, satellite images, facies analysis and pin set on the banks to identify the influences
of vegetation and material in the migration processes of meanders. The channel showed high
mobility verified by the high amount of migration process in 47 years, due to the planforms
diffusion and oxbow lakes and by deposits and paleochannel sedimentary facies. The vegetation
has not shown attenuating effect against the bank erosion in the two curves analyzed meanders,
erosion rates for the segments with vegetation cover were up to 1,3m ahead of the environments
of floodplain. It was found that the intensity of channel migration differs between the curves.
Migration advances with little resistance from unconsolidated deposits of the current
floodplain, whereas in older deposits, pedogenesis and consistent terraces have hindered lateral
advance, due to theirs material.
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CASTRO, W. S. Migração dos meandros do baixo curso do rio Claro, Goiás: processos e fatores controladores. 2015. 98 f. Dissertação (Mestrado em Geografia) - Universidade Federal de Goiás, Goiânia, 2015.