Mass movements and floods triggered by rainstorms are considered some of the most serious environmental problems and are quite often able to cause great disasters in large tropical cities. This has been occurring due to anthropic activities which change natural drainage and stability of slope in urban areas. However, lower monthly rainfalls which occur with high frequency can also cause mass movements and floods. The direct and indirect effects of less intense but continuous rainfall mainly affect less privileged communities, which occupy areas more sensitive to mass movements and flooding, such as locations along river margins, coastal lagoons, mangroves, and steep slopes. This manuscript highlights the important contribution of the lower monthly rainfall totals in triggering mass movements and floods on the east side of Pedra Branca Massif in the city of Rio de Janeiro. Geoprocessing was used to estimate the total monthly rainfall in rain gauges managed by the local authority; create surface interpolation and choropleth maps; and conduct a comparative analysis of histograms of the total monthly rainfall and flooding and mass movement records provided by the City's Civil Defence. The results confirmed the direct relation between higher monthly rainfall totals and mass movements and floods, and also showed that lower monthly rainfall totals can trigger a significant occurrence of such events. Moreover, the monthly rainfall limit that could trigger mass movements and floods was confirmed on the east side of Pedra Branca Massif.

A navegação consulta e descarregamento dos títulos inseridos nas Bibliotecas Digitais UC Digitalis, UC Pombalina e UC Impactum, pressupõem a aceitação plena e sem reservas dos Termos e Condições de Uso destas Bibliotecas Digitais, disponíveis em https://digitalis.uc.pt/pt-pt/termos.Conforme exposto nos referidos Termos e Condições de Uso, o descarregamento de títulos de acesso restrito requer uma licença válida de autorização devendo o utilizador aceder ao(s) documento(s) a partir de um endereço de IP da instituição detentora da supramencionada licença.Ao utilizador é apenas permitido o descarregamento para uso pessoal, pelo que o emprego do(s) título(s) descarregado(s) para outro fim, designadamente comercial, carece de autorização do respetivo autor ou editor da obra.Na medida em que todas as obras da UC Digitalis se encontram protegidas pelo Código do Direito de Autor e Direitos Conexos e demais legislação aplicável, toda a cópia, parcial ou total, deste documento, nos casos em que é legalmente admitida, deverá conter ou fazer-se acompanhar por este aviso. Palavras chave: Gestão ambiental, unidades de conservação, zonas de amortecimento, planos de manejo, legislação ambiental. RESUMEN Gestión ambiental de zonas de amortecimiento de unidades de conservación en áreas urbanas -Este artículo trata,desde el punto de vista jurídico, la importancia de la defi nición, el diagnóstico, el establecimiento de criterios de uso y ocupación y el monitoreo de zonas de amortecimiento de unidades de conservación de protección integral. La gestión de unidades de conservación debe considerar las áreas del entorno, buscando evitar el avance de actividades antrópicas externas sobre los ecosistemas naturales dentro de sus límites.Palabras clave: Gestión ambiental, unidades de conservación, zonas de amortecimiento, planes de gestión, legislación medioambiental. RÉSUMÉ La gestion environnementale des zones tampons des unités de conservation dans les aires urbaines - Mots-clé:Gestion environnementale, unités de conservation, zones tampons, plans de gestion, législation environnementale. ABSTRACTEnvironmental management of the buffer zones of conservation units in urban areas -This article examines, from a legal standpoint, the importance of the defi nition, diagnosis and establishment of criteria for the use, occupation and monitoring of buffer zones for conservation units of integral protection. The management of conservation units should take into account the areas surrounding the unit, so as to avoid the encroachment of external anthropic activities on to the natural ecosystems within the unit boundaries.

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