<p>A ocupação desordenada de áreas de encostas sem o devido planejamento associadas a eventos de ordem natural acabam gerando perdas sociais e econômicas. As pessoas que ali ocupam quando não orientadas acabam intensificado os risco geomorfológicos tornado-se ainda mais vulneráveis a tais processos. Desta forma artigo objetiva analisar a percepção dos riscos Geomorfológicos em áreas de com grau de risco alto e muito alto no município de Barbalha-Ce. Este artigo é um recorte da pesquisa de mestrado do primeiro autor que realizou um mapeamento de todo o município. Os procedimentos metodológicos deste trabalho contou com uma revisão bibliográfica acerca do tema e a colaboração de 50 moradores das áreas suscetíveis aos processos geomorfológicos residentes nos bairros Tupinambá, Alto do Rosário, Bela Vista e Sítio Riacho do Meio. As informações foram coletadas a partir da aplicação de um questionário estruturado com 20 perguntas referentes às condições geoambientais e socioeconômicas. Como medidas socioeducativas foram distribuídas para os moradores cartilhas sobre os “Riscos em encostas” e “saúde ambiental”. A partir das informações coletadas pode-se observar que todas as comunidades apresentam problemas sociambientais e que muitos moradores não tem conhecimento dos riscos aos quais estão vulneráveis.</p>
Field and laboratory testing can be done in order to achieve erodibility potential indicator parameters. Geotechnical characterization testing (soil size analysis, liquid limit, plasticity limit, shear strength, permeability) and other more specific tests (e.g., slaking, crumb, Inderbitzen) could provide information on the hydraulic and mechanical behavior of the soil and, in turn, be directly related to the erodibility potential, making it easier to understand the erosion processes.
. In the Metropolitan Region of Recife, Northeast Brazil, landslides caused a total of 214 deaths between 1984 and 2012. Efforts have been made, but there is still need to improve the risk area management by discovering the correlations between the rainfall and landslides and by implementing a disaster warning and prevention system in order to reduce the number of accidents and fatalities. The purpose of this study is to propose rainfall parameters likely to trigger mass movements, as a contribution to risk management in this region. It specifically addresses the study undertaken in three municipalities: Recife, Camaragibe and Jaboatão dos Guararapes, which have disorganized occupation in high and very high risk areas. In order to achieve the prime objective, rainfall and landslides were tracked during 2009 to obtain correlations between them. After the data was logged, the rainfall accumulation associated with landslides was checked. According to each area with civil defense action of the municipalities involved in the study, critical values of the cumulative rainfall in 72 h (I72 h), in the long term (Pac) and the parameter Rcrit resulting from the product of I72 h by Pac, are suggested herein to be recommended for operations of the Warning and Alert states. By achieving these critical values, they increase the probability of landslide events, and are important for taking decisions and instructions on Civil Defense actions.
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