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Universidade do Minho (2006)

Construção de um sistema de indicadores da qualidade das águas superfíciais numa bacia hidrográfica

Oliveira, Rita Emília Silva

Titre : Construção de um sistema de indicadores da qualidade das águas superfíciais numa bacia hidrográfica

Auteur : Oliveira, Rita Emília Silva

Université de soutenance : Universidade do Minho

Grade : Mestrado em engenharia municipal 2006

Résumé
The European Water Framework Directive establishes a common framework for sustainable and integrated management of natural waters. This implies a tight connection between management bodies and instruments of analysis for decision making. The river basin, primordial unity of planning and management, is usually submitted to pressures and changes, due to human activities. At a river basin scale there is a need to establish a methodology for systematic data monitoring, for the characterization of surface water quality and for the correct analysis of collected data, so that the present and expected future pressures may be identified and understood. The assessment of pressure-state-impact interaction can be facilitated using environmental indicator tools, which are on the basis of one of possible methods of analyses, treatment and information capable of transforming scientific data in clear way of communication with public. This research work describes the methodology developed in the implementation of an indicator system for the Portuguese River Ave Basin surface waters. This assessment tool is based on the conceptual model Pressure-State-Response and may be used to evaluate three types of quality variables : biological, physical-chemical and hydro-morphological. In the present work, this approach was applied only to physical-chemical quality variables. For the indicators calculation, data from the National Water Quality Network relative to the years 2002, 2003, 2004 and 2005 were used. The characterization of the surface waters quality consists on a group of steps and deals with eutrophication, dissolved oxygen, contamination by microorganisms, organic matter and heavy metals. For each of these thematics, pressure, state and response indicators were defined.

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Page publiée le 28 mars 2011, mise à jour le 23 août 2018