%0 Journal Article %T Optimiza£¿£¿o da Explora£¿£¿o de Recursos H¨ªdricos considerando o Efeito de Queda %A Catal£¿o %A Jo£¿o %A Mariano %A S¨ªlvio %A Mendes %A Victor %A Ferreira %A Lu¨ªs %J Investiga£¿£¿o Operacional %D 2007 %I Scientific Electronic Library Online %X this paper focuses on the optimal scheduling of hydro power systems. a new methodology based on nonlinear optimisation is proposed for solving the problem considering the head change effect. the numerical results obtained for a case study illustrate the behaviour of the new methodology proposed. %K optimal scheduling %K nonlinear optimisation %K head change effect. %U http://www.scielo.gpeari.mctes.pt/scielo.php?script=sci_abstract&pid=S0874-51612007000100003&lng=en&nrm=iso&tlng=en