Integrating hydrology,hydraulics and ecological response into a flexible approach to the determination of environmental water requirements for rivers |
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| Authors: | DA Hughes D Louw |
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| Affiliation: | 1. Centre for Hydrology, University of Saskatchewan, Saskatoon, SK, Canada;2. Environment Canada, Saskatoon, SK, Canada;1. Department of Food and Environmental Sciences, P.O. Box 27, Latokartanonkaari 11, Environmental Soil Science, FI-00014 University of Helsinki, Finland;2. Department of Agricultural Sciences, P.O. Box 28, Koetilantie 5, Agrotechnology, FI-00014 University of Helsinki, Finland;1. Laboratory of Applied Hydraulics, Department of Water Resources and Environmental Engineering, School of Civil Engineering, National Technical University of Athens, Iroon Polytechniou 5, 15780, Athens, Greece;2. Research Institute for Integrated Management of Coastal Areas (IGIC), Universitat Politècnica de València, C/Paranimf 1, Grau de Gandia, 46730, València, Spain;3. Institute of Marine Biological Resources and Inland Waters, Hellenic Centre for Marine Research, 46,7 km Athens- Sounio, Mavro Lithari, Anavissos, Attiki, GR, 19013, Greece;4. Institute of Hydraulic and Water Resources Engineering, Technical University of Munich, 80334, Munich, Germany;1. Department of Water Resources and Environment, Sun Yat-sen University, Guangzhou, China;2. Key Laboratory of Water Cycle and Water Security in Southern China of Guangdong High Education Institute, Sun Yat-sen University, Guangzhou, China;3. Guangdong Provincial Key Laboratory of Urbanization and Geo-simulation, School of Geography and Planning, Sun Yat-sen University, Guangzhou, China;4. Department of Biological and Agricultural Engineering & Zachry Department of Civil Engineering, Texas A&M University, College Station, TX, USA |
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| Abstract: | There are many different approaches to environmental water requirement (EWR) determinations that have been reported in the international literature. Many of these focus on different aspects of the problem, while few of them consider all of the issues associated with the eventual implementation of EWR as part of integrated water management. It is also necessary to recognize that there is a wide range of different types and resolution of information available in different parts of the world. This paper presents an integrated framework that has been in use in South Africa for several years and which is based on integrating the impacts of changing flow regimes on different ecosystem response components through indices of ‘stress’ measured on a common scale (0–10). Software to support its implementation has been included as part of an existing hydrological modelling framework package that includes a GIS interface and database management procedures. The framework is flexible enough to be used with different approaches to analyzing ecosystem responses, ranging from complex hydraulic habitat assessments to the interpretation of expert opinion and therefore should be widely applicable. The framework can also be used to design a modified flow regime for a given set of ecological objectives, or it can be applied to assess scenarios of flow regimes based on a range of possible future water management options. The paper explains the approach, provides some illustrations of its application and discusses some of the issues associated with its more widespread use. |
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