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Σύστημα εκτίμησης της αποδεκτής O ικολογικής Παροχής σε ποτάμια και ρέματα της Ελλάδας ECOFLOW PowerPoint PPT Presentation


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Σύστημα εκτίμησης της αποδεκτής O ικολογικής Παροχής σε ποτάμια και ρέματα της Ελλάδας ECOFLOW. Αναγνωρισμένα προβλήματα:. Η κατασκευή φραγμάτων και μεγάλων έργων υδρομάστευσης χωρίς την κατάλληλη υποστηρικτική δομή και γνώση οδηγεί αρκετά συχνά σε:

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Σύστημα εκτίμησης της αποδεκτής O ικολογικής Παροχής σε ποτάμια και ρέματα της Ελλάδας ECOFLOW

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  • Environmental flows describe the quantity, timing, and quality of water flows required to sustain freshwater andestuarine ecosystems and the human livelihoods and wellbeing that depend on these ecosystems (BrisbaneDeclaration).

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  • - Dyson, Bergkamp & Scanlon (2003) in the IUCN guide on environmental flows define the concept as the water regimeprovided within a river, wetland or coastal zone to maintain ecosystems and their benefits where there arecompeting water uses and where flows are regulated.

  • - The 4th International Ecohydraulics Symposium defined environmental flows as the water that is left in a riversystem, or released into it, to manage the health of the channel, banks, wetland, floodplains or estuary.

  • - Environmental flows can be described as the quality, quantity, and timing of water flows required to maintain thecomponents, functions, processes, and resilience of aquatic ecosystems which provide goods and services to people(Hirji and Davis, 2009)

  • - Arthington & Pusey (2003) define the objective of environmental flows as maintaining or partially restoring importantcharacteristics of the natural flow regime (ie. the quantity, frequency, timing and duration of flow events, rates ofchange and predictability/variability) required to maintain or restore the biophysical components and ecologicalprocesses of instream and groundwater systems, floodplains and downstream receiving waters.

  • - Tharme (2003) defines an environmental flow assessment (EFA) as an assessment of how much of the original flowregime of a river should continue to flow down it and onto its floodplains in order to maintain specified, valuedfeatures of the ecosystem

  • - IWMI (2004) defines environmental flows as the provision of water for freshwater dependent ecosystems to maintaintheir integrity, productivity, services and benefits in cases when such ecosystems are subject to flow regulation andcompetition from multiple water users.

  • - Brown and King (2003) state that environmental flows is a comprehensive term that encompasses all components ofthe river, is dynamic over time, takes cognizance of the need for natural flow variability, and addresses social andeconomic issues as well as biophysical ones

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