Relações entre a rede de drenagem e as superfícies de aplainamento no semiárido: a bacia hidrográfica do rio Bom Sucesso (Bahia)
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Data
2012-10-18
Autores
Lima, Kleber Carvalho [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Esta pesquisa tem por objetivo analisar, de forma quali-quantitativa, a rede de drenagem da bacia hidrográfica do Rio Bom Sucesso (Bahia), partindo do pré-suposto de que as drenagens de ambientes semiáridos são pouco eficientes no processo de evolução das superfícies de aplainamento. Busca também estabelecer as relações entre a rede de drenagem e a elaboração de compartimentos geomorfológicos por meio dos diferentes padrões de drenagem. Para tanto, a abordagem sistêmica foi adotada como método de análise por se entender que os componentes do sistema interagem entre si, favorecendo a elaboração de formas de relevo que evoluem no decorrer do tempo. A unidade de análise espacial escolhida está inserida em uma área de atuação do clima semiárido, onde poucas pesquisas de cunho geomorfológico foram desenvolvidas. Os resultados demonstraram que a atuação do clima quente e seco favoreceu a elaboração de uma vasta superfície de aplainamento que se encontra organizada em três níveis topográficos distintos, sendo que os níveis superior e intermediário estão conservados e o nível inferior, dissecado. As características morfológicas e morfométricas da rede de drenagem indicam que se trata de uma bacia hidrográfica cuja atuação dos canais fluviais, em geral, é pouco eficaz na dissecação do relevo, porém, a interação desta com a geologia local favoreceram graus de dissecação diferenciados, o que resultou na formação de seis compartimentos geomorfológicos. Por meio das características dos compartimentos, afirma-se que estes exibem formas que comumente são encontradas no quente e seco. No entanto, formas de relevo como topos suavemente convexos e vertentes convexas foram identificadas e que, provavelmente, estão relacionados a processos azonais. Os procedimentos técnicos e metodológicos empregados contribuíram para que esses resultados fossem alcançados e, sugere-se que, novos métodos sejam aplicados
This research aims to analyze, in quali-quantitative form, the drainage network of the river basin Bom Successo (Bahia), starting from the presupposition that the drainage of semi arid environments are less efficient in evolution process of planning surfaces. It also points to establish the relationship between the drainage network and the elaboration of geomorphological compartments through the different drainage patterns. For this, the system approach was adopted as a method of analysis to understand that system components interact with each other, favoring the elaboration of landforms that evolute in the course of time. The unit of spatial analysis chosen is inserted in a field of semiarid climate, where few geomorphological surveys were developed. The results showed that the performance of the hot and dry climate favors the elaboration of an extensive planning surface that is organized into three distinct topographic levels, whereas the upper and intermediate levels are preserved and the lower level, dissected. The morphological and morphometric characteristics of the drainage network indicate that this is a watershed whose performance, in general, is not very effectual in dissecting the relief, nevertheless, the interaction of that with the local geology favored different degrees of dissection, which resulted in the formation of six geomorphological compartments. Through the compartments features, it is said that they exhibit shapes which are commonly encountered in hot and dry. However, landforms as tops gently convex and convex hillsides have been identified and are probably related to non zonal processes. The technical and methodological procedures employed contributed to these results were achieved and it is suggested that new methods are applied in order to better understand the influence of the drainage network in the evolution of the modeled of semi arid regions
This research aims to analyze, in quali-quantitative form, the drainage network of the river basin Bom Successo (Bahia), starting from the presupposition that the drainage of semi arid environments are less efficient in evolution process of planning surfaces. It also points to establish the relationship between the drainage network and the elaboration of geomorphological compartments through the different drainage patterns. For this, the system approach was adopted as a method of analysis to understand that system components interact with each other, favoring the elaboration of landforms that evolute in the course of time. The unit of spatial analysis chosen is inserted in a field of semiarid climate, where few geomorphological surveys were developed. The results showed that the performance of the hot and dry climate favors the elaboration of an extensive planning surface that is organized into three distinct topographic levels, whereas the upper and intermediate levels are preserved and the lower level, dissected. The morphological and morphometric characteristics of the drainage network indicate that this is a watershed whose performance, in general, is not very effectual in dissecting the relief, nevertheless, the interaction of that with the local geology favored different degrees of dissection, which resulted in the formation of six geomorphological compartments. Through the compartments features, it is said that they exhibit shapes which are commonly encountered in hot and dry. However, landforms as tops gently convex and convex hillsides have been identified and are probably related to non zonal processes. The technical and methodological procedures employed contributed to these results were achieved and it is suggested that new methods are applied in order to better understand the influence of the drainage network in the evolution of the modeled of semi arid regions
Descrição
Palavras-chave
Geomorphology, Geomorfologia, Drenagem, Geomorfologia climatica, Regiões aridas, Clima de regiões aridas
Como citar
LIMA, Kleber Carvalho. Relações entre a rede de drenagem e as superfícies de aplainamento no semiárido: a bacia hidrográfica do rio Bom Sucesso (Bahia). 2012. 135 f. Dissertação - (mestrado) - Universidade Estadual Paulista, Instituto de Geociências e Ciências Exatas, 2012.