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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

AnÃlise multitemporal da dinÃmica do usos e ocupaÃÃo do baixo curso do rio de Apodi - Mossorà (1989-2009) / Multisecular analysis of the dynamics of the use and occupation of the low course of river Apodi-mossorÃ-rn(1989-2009)

Alexsandra Bezerra da Rocha 29 June 2011 (has links)
Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico / AtravÃs da anÃlise geoambiental este trabalho esta voltado para o estudo da bacia hidrogrÃficacomo categoria de anÃlise geogrÃfica. A bacia hidrogrÃfica do rio Apodi-Mossorà representa27% do territÃrio do estado do Rio Grande do Norte, cobrindo uma Ãrea total 14.271 kmÂ, tendo como recorte espacial para este estudo o baixo curso do referido rio cobrindo 973 Km2 . No tocante a geodiversidade trata-se de uma Ãrea caracterizada pela presenÃa de uma chapada, de tabuleiros costeiros, de planÃcie flÃvio-marinha, de faixa costeira com praias, falÃsias e dunas. Neste contexto, este trabalho teve como objetivo realizar a anÃlise do quadro ambiental, considerando a dinÃmica do uso e ocupaÃÃo, atravÃs de estudo multitemporal de 1989 a 2009, fundamentalmente, identificando e espacializando as unidades geoambientais, as pressÃes de uso, utilizando o sensoriamento remoto, o sistema de informaÃÃo geogrÃfica para manipulaÃÃo e cruzamento de informaÃÃes, pesquisa qualitativa-quantitativa, obtendo como resultado final um conjunto de sete mapas. O resultado tambÃm indicou em hectares a porcentagem das atividades econÃmicas em 1989 sendo: 16,4% de cultura cÃclica, 19,2% de cultura perene, 0,04% de Ãreas petrolÃfera, 64,4% salinas (artesanais e industriais), jà em 2009 a cultura perene representou 32,7%, as atividades petrolÃferas 33,4% e as salinas (artesanais e industriais) 34% e a carcinicultura 2%. Observandoâse, portanto um crescimento de 126% para culturas perenes, 1.847% da atividade petrolÃfera e 28,50% para as salinas. Entende-se que as diferentes formas de uso altera a dinÃmica ambiental da Ãrea de estudo, contribuindo na intensificaÃÃo dos processos fluviais, na deposiÃÃo de sedimentos, no assoreamento, na erosÃo, na destruiÃÃo da mata ciliar e do ecossistema manguezal. As alteraÃÃes no baixo curso do rio Apodi-Mossorà correspondem a modificaÃÃes muito significativas na morfologia original e na dinÃmica dos processos geomorfolÃgicos, na taxa de descarga fluvial mÃdia anual e na taxa de transporte de sedimentos. Esses fatos associados aos ambientes de ocupaÃÃo inadequada promovem o surgimento de Ãreas com elevado comprometimento da qualidade ambiental. / Through a geoenvironmental analysis, this work is related to the study of a hidrographic basin as a geographical analysis category. The hydrographic basin of the Apodi-Mossorà river represents 27% of the territory of the state of Rio Grande do Norte, covering a total area of 14.271 km2, having a spatial cutting for this study, the lower course of the mentioned river, which covers 973 km2. Regarding the geodiversity, it is characterized as an area with a presence of a plateau, coastal tablelands, fluviomarine plain, of coastal band with beaches, cliffs and dunes. In this context, the work had the objective to do an analysis of the environmental framework considering the dynamics of the use and occupation, through a study of a multitemporal scale from 1989 to 2009, basically identifying and putting on a spatial scale the geoenvironmental units, the pressure of use, using remote sensoring, the geographical information system for the handling and information crossing, qualitative quantitative research, obtaining as a final result a set of seven maps. The result also indicated, in hectares, a percentage of economic activities in 1989 as: 16,4% of cyclical cultures, 19,2% of perennial culture, 0,04% of petroliferous areas, 64,4 % of salt-mines (craft and industrial). In 2009, the perennial cultures represented 32,7% , the petroliferous activities 33,4%, saltmines 34% (craft and industrial) and the breeding of crabs and other crustaceous 2%. Therefore, it was observed a growth of 126% for perennial cultures, 1.847% for petroliferous activities and 28,50% for alt-mine activities. We can understand that the different forms of use alters the environmental dynamics of the studied area, contributing to the intensification of fluvial processes, to the deposition of sediments, to the silting up process, to the erosion, to the destruction of cilliary woods and to the ecosystemÂs mangal. The changes in the low course of Apodi-Mossorà river, correspond to the very significant modifications of the original morphology and in the dynamics of geomorphological processes, in the rate of average annual fluvial discharge and in the rate of transportation of the sediments. Those facts, associated with the environments of inadequate occupation foster the emergence of areas with high exposure of environmental quality.

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