Revista Recursos Hdricos

DOI:10.5894/rh35n2-3
Este artigo foi apresentado no 12 Congresso da gua e selecionado para submisso e possvel publicao na Recursos Hdricos, tendo sido aceite pela Comisso de Editores Cientficos Associados em 30 de maio de 2014. Este artigo parte integrante da Revista Recursos Hdricos , Vol. 35, N 2, 29-39, novembro de 2014.  

Modelos de gesto de bacias hidrogrficas: aplicao do IRAS-2010 e do AQUATOOL ao aproveitamento hidroagrcola do Vale do Sorraia

River basin management models: applicationof IRAS-2010 and AQUATOOL to the Sorraia Valley irrigation project

Joana SIMES¹, Rodrigo PROENA DE OLIVEIRA²

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1 - Consultora ambiental da echiron jsimoes@echiron.com
2 - Professor auxiliar no Instituto Superior Tcnico, Diretor da Unidade de Consultoria Ambiental da echiron rodrigopoliveira@tecnico.ulisboa.pt

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RESUMO
A simulao matemtica da operao de aproveitamentos hidrulicos permite avaliar o desempenho de polticas de operao e identificar aquelas que melhor asseguram o cumprimento dos objetivos do sistema.
Este artigo aplica os modelos IRAS-2010 e AQUATOOL ao Aproveitamento Hidroagrcola do Vale do Sorraia, que se situa na margem esquerda do rio Tejo e abrange uma rea de 16000 ha. Os principais cursos de gua afluentes ao sistema so as ribeiras de Sr, Seda e Tera. O armazenamento de gua assegurado pelas albufeiras de Montargil e do Maranho.
Os modelos diferem na explicitao das regras de operao do sistema. O IRAS-2010 recorre a regras explcitas de alocao em funo da disponibilidade de gua, enquanto o AQUATOOL procura minimizar os desvios a objetivos pr-estabelecidos de fornecimento e de armazenamento.
Os resultados dos volumes armazenados obtidos pelos dois modelos so semelhantes, mas excedem os valores observados provavelmente devido a erros na estimativa das afluncias, das necessidades ou das perdas de gua, ou ainda devido adoo de regras de operao simplificadas. Os valores calculados para os diferentes indicadores de desempenho, nomeadamente fiabilidade, vulnerabilidade e resilincia, so tambm semelhantes.

Palavras-chave: Aproveitamento hidroagrcola do Vale do Sorraia, AQUATOOL, Gesto de bacias hidrogrficas, IRAS-2010, Polticas de operao de albufeiras, Planeamento de recursos hdricos.

ABSTRACT
Mathematical models may be used to assess the operation of water resources systems and to determine the operation policies that best ensure the compatibility between water availability and the system objectives.
This article applies models IRAS-2010 and AQUATOOL to the Sorraia Valley irrigation project. This project lies on the left bank of the Tagus River and covers an area of 16000 ha. The main inflows to the system are the Sr, Seda and Tera rivers. Water storage is provided by the Maranho and Montargil dams.
The models differ in the way the rules of operation are defined. IRAS-2010 uses explicit allocation rules depending on the availability of water, while AQUATOOL minimizes deviations from pre-established targets for delivery and storage.
The results from both models for stored volumes are similar and close to the observed values. The differences are probably due to errors in the estimation of inflows, water needs or water losses, or to the adoption of simplified operation rules. The estimated values of performance indicators, such as reliability, vulnerability and resilience, are also similar.

Keywords: Sorraia Valey irrigation project, AQUATOOL, river basins management, IRAS-2010, reservoir operation policies, water resources planning.

 

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