Assessment of changes in the drainage network of hydrographic sub-basins fo the medium course of the Capivari river basin (SP): scale 1:25.000 - subsidy for integrated planning / Avaliação das alterações na rede de drenagem de sub-bacias hidrográficas da porção média da bacia do rio Capivari (SP): escala 1:25.000 - subsídio para o planejamento integrado

AUTOR(ES)

Rogério Pinto Ribeiro

DATA DE PUBLICAÇÃO

2002

RESUMO

This work used the drainage as a geoindicator to the changes that have taken place during 23 years (1972 to 1995) in the physical environment of three hydrographic sub-basins within the Monte Mor municipal boundaries, located in the medium course of the Capivari river hydrographic basin. The methodological approach comprises a complete characterization of the land attributes, drainage network and anthropic occupation for the sub-basins. The main features of the physical environment, such as geology, unconsolidated materials, landforms and slope were characterized. In order to identify the changes, a temporal analysis of the drainage network morphometric variables and land use were made. Data was collected by field work, aerialphotointerpretation (1:25000 scale) and processed by using the softwares ENVI and AutocadMap. In this work, maps of documentation, drainage, landforms, bed rock, unconsolidated materials and use and occupation and also a slope chart were generated. The drainage systems has showed to be an appropriate indicator of the environmental changes for the studied area. The morphometric analysis indicates a decrease in the number of first-order channels and in the total length of all channels. Modifications in the drainage and hydrographic densities have also been observed. The global analysis of the changes of the number of first order channels has indicated that most of the channels had small dimensions (<150m). Such changes were induced by the urban growth of Monte Mor and by the intensive sugar cane raising. They are also related to the different slope classes and to the several types of landforms, bedrock and unconsolidated materials

ASSUNTO(S)

aerialphotointerpretation aerofotointerpretação anthropic activities análise morfométrica rede de drenagem atividades antrópicas morphometric analysis drainage network

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