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Previous issue date: 2016-06-16 / A avalia??o adequada da seca hidrol?gica para auxiliar o monitoramento de um poss?vel d?ficit h?drico pode ser crucial na ado??o de medidas de combate ? seca, principalmente na regi?o semi?rida, onde esse fen?meno ? mais recorrente. Por?m, as metodologias tradicionais utilizam ?ndices padronizados de seca, que n?o expressam a sua severidade em termos do volume de d?ficit e nem consideram a demanda h?drica como uma componente do seu c?lculo. Como forma de superar essas desvantagens, este trabalho apresenta uma metodologia de avalia??o da seca hidrol?gica, a qual determina o volume de ?gua abaixo da demanda requerida para diferentes intervalos de tempo, de onde se pode caracterizar a seca em fun??o de sua dura??o, severidade e magnitude, baseando-se no m?todo do N?vel Limite. Para tanto, foram estudadas as secas ocorridas entre 1997 e 2015 em dois reservat?rios de diferentes capacidades da bacia hidrogr?fica do Rio Piranhas-A?u. De forma complementar, foi utilizado o m?todo de avalia??o de seca hidrol?gica desenvolvido por Ara?jo & Bronstert (2015) a fim de comparar as caracter?sticas dos eventos de seca identificados por diferentes m?todos para os mesmos reservat?rios. Pelas duas metodologias, os resultados mostraram que o reservat?rio com maior capacidade de acumula??o ? mais eficiente e, assim, menos suscept?vel ? seca do que o de menor porte. Foi verificado que a diferen?a b?sica entre as duas abordagens ? o tempo de an?lise dos eventos de seca: enquanto pelo m?todo do N?vel Limite ? poss?vel estudar as secas ocorridas no passado para diagnosticar e fazer um planejamento dos usos dos reservat?rios no futuro, o m?todo de Ara?jo e Bronstert (2015) possibilita a avalia??o das condi??es atuais para prever o in?cio de uma seca hidrol?gica. Nessa perspectiva, sugere-se que as duas metodologias apresentadas neste trabalho possam ser utilizadas simultaneamente pelos gestores de recursos h?dricos, a fim de possibilitar uma an?lise mais abrangente dos eventos de seca ocorridos na bacia. / The proper assessment of hydrologic drought to assist the monitoring of a possible water deficit may be crucial in the adoption of anti-drought attitudes, especially in the semiarid region, where this phenomenon is most frequent. However, traditional methodologies uses standardized drought indices, which do not express its severity in terms of the volume deficit and neither consider water demand as a component of its calculation. In order to overcome these disadvantages, this work presents evaluation methodology of hydrological drought, which determines the volume of water below its demand. It can be characterized in function of its duration, severity and magnitude, based on Threshold Level Method. For this purpose, the droughts that occurred between 1997 and 2015 were studied in two reservoirs of different capacities of the Piranhas-A?u River basin. Complementarily, it was used the method of valuation of hydrological drought developed by Ara?jo and Bronstert (2016) to compare the characteristics of drought events identified by different methods to the same reservoirs. For both methods, the results showed that the reservoir with higher storage capacity is more efficient and thus less susceptible to drought than the smaller. It was found that basic difference between the two approaches is the time analysis of drought events: while the Threshold Level Method is possible to study what occurred in the past to diagnose and make a planning of the use of water in future, the Ara?jo and Bronstert (2016) method enables the assessment of current conditions to anticipate the start of a hydrologic drought. In this perspective, it is suggested that the two methodologies presented in this paper can be used simultaneously by managers of water resources in order to enable a more comprehensive analysis of drought events in the basin.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/21572 |
| Date | 16 June 2016 |
| Creators | Medeiros, Giovana Cristina Santos de |
| Contributors | 93953356534, http://lattes.cnpq.br/0533084856785161, Neves, Josemir Ara?jo, 76178420404, http://lattes.cnpq.br/7524671581334750, Ara?jo, Jos? Carlos de, 21382980353, Medeiros, Joana Darc Freire de, Maia, Adelena Gon?alves |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA SANIT?RIA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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