Determinação do padrão do caudal ecológico da Bacia do Rio Umbelúzi: uma contribuição para a discussão sobre a gestão sustentável dos rios

Abstract

Abstract The Umbeluzi river basin currently has a flow disturbed by the existing dams in it. This situation makes downstream of Pequenos libombos, in the months of June, July, August, September and October, the required ecological flow is not satisfactory in 68%, since the necessary is 1.6m3/3 against the current 0.5m3/s . This situation is due to the operating rules defined for the small Libombos dam. In addition, the required ecological flow is 100% satisfied throughout the year. In the future, ARA-SUL, the entity responsible for water management, must organize itself to adjust the current minimum flow to a necessary ecological flow. The result presented above is the product of the present study, which aimed to determine the pattern of the "ecological flow" in the Umbeluzi river basin, on the scale of the Mozambican territory; from three selected points in the basin: Goba, Little Libombos and Boane. Starting from the problem of: lack of an ecological flow to maintain reproduction to maintain the reproduction of ecosystems, changes in the dynamics of the balance between the fluvial part and the oceanic system and the progression of saline intrusion. And based on theories, application of ecological flow calculation methodologies, use of the simulation model 'River Basin System WAFLEX" and field work, it was determined in the current study area of ​​ecological flow.(TRADUÇÃO NOSSA)