Definition Of Ecological Flows Downstream Of
Dams Located In The South Of Portugal:
A New Method
Author(s)
M. M. Portela
Abstract
One of the environmental issues related with the numerous dams of the Alqueva
irrigation system (South of Portugal) was, and still is, the definition of the
ecological regimes. Besides other features, those regimes must account for the
extreme water scarcity that characterizes the region.
For the 12 dams of the Alqueva system (either existing or new ones) several
methods aimed at defining the ecological flows were applied. The comparison of
the ecological flows thus predicted revealed the inadequacy of the different
methods, suggesting the need for a new approach capable of providing
comparable ecological flows under similar hydrologic constraints. In the
previous scope a new method supported by hydrologic and hydraulic criteria was
developed. The hydrologic criteria account for the water scarcity and for the
temporal irregularity of the natural hydrologic regime and the hydraulic criteria,
for the geometry of the cross sections and of the river reaches. The method is
briefly described and the ecological flows achieved for 12 case studies are
presented.
Keywords: ecological flows, hydrologic-hydraulic method, hydrologic regime,
hydraulic characteristics, cross section, mean flow velocity.
1 Introduction: scope of the study
In the next few years an intense agricultural development is expected in Alentejo
(South of Portugal) as result of the construction of the Alqueva dam, located in
the Guadiana River and providing a huge reservoir, in fact, the largest artificial
Keywords
ecological flows, hydrologic-hydraulic method, hydrologic regime,
hydraulic characteristics, cross section, mean flow velocity.
Related Book
Other papers in this volume
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