Riscos Geoambientais e a expansão da área urbana na Região Metropolitana de Natal, Nordeste do Brasil: uma abordagem preliminar
Based on techniques for satellite´s images processing is presented here a model for systematization of environmental risks in the Natal metropolitan area. Other support of model is recognition of a set of environmental units defined with the identification of climatic, geologic, geomorphologic, hidr...
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| Principais autores: | , |
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| Formato: | article |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Ceará
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/30476 |
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| Resumo: | Based on techniques for satellite´s images processing is presented here a model for systematization of environmental risks in the Natal metropolitan area. Other support of model is recognition of a set of environmental units defined with the identification of climatic, geologic, geomorphologic, hidrochemical, pedologic, hydrogeologic and hydrologic characteristics. Also were analyzed the temporal variation during 25 years of LANDSAT and CBERS products. A routine of techniques and procedures was established to model the dependence of physical conditions with the evolution of urban area mainly unsupervised classification using algorithms pre-established (e.g., ISODATA, K-means). The results were the recognition of two main categories of environmental risks related with urban area evolution. The first category concentrated the changes of hidrogeologic cycle related to effluents discharge from the urban area. The changes of sedimentary processes in the coastal and estuaries areas comprise the second category. Among the evidences were identified plumes of nitrate contamination and the destruction of mangrove areas for deployment of equipment for various purposes. Key-words: territorial management, evolution of urban area, environmental vulnerability |
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