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Habersack H.,University of Vienna | Haimann M.,University of Vienna | Baranya S.,Budapest University of Technology and Economics | Jozsa J.,Budapest University of Technology and Economics | And 6 more authors.
Osterreichische Wasser- und Abfallwirtschaft | Year: 2014

The multiple uses of the Danube River for navigation, hydropower production and as a drinking water supply influence its ecological quality. Flow restrictions due to regulation as well as impacts on the sediment regime such as retention in the catchment area and interruption of the sediment continuum result in changes of the hydromorphological structures and can produce major problems in the context of sediment management.In light of these facts, cross-border investigations of sediment transport at the Danube River are called for. As there are no uniform research approaches shared by Austria and Hungary, the EU-funded project SEDDON (Sediment Research and Management at the Danube River) aims to compare different monitoring and modeling techniques used to determine sediment transport, and to develop mutual solutions. Further, the laboratory equipment currently used for hydraulic model experiments is evaluated and a research channel with a free flowing discharge of up to 10 m3/s without pumping will be constructed, allowing large-scale joint laboratory tests concerning sediment to be performed. © 2014, Springer-Verlag Wien. Source

Pleschko D.,Bundesministerium fur Land und Forstwirtschaft | Kaufmann A.,Institute For Wasserbau Und Hydrometrische Prufung
Osterreichische Wasser- und Abfallwirtschaft | Year: 2012

Summary: The EU Floods Directive has introduced a cyclical planning approach for the management of flood risks. The three tools provided in the Directive - preliminary risk assessment, flood hazard and flood risk maps as well as flood risk management plans - must be revised every six years. Austria's implementation of the EU Floods Directive is the consistent continuation of its strategy adopted when dealing with the consequences of the 2002 and 2005 floods. It has long been the declared objective of experts at both the federal and provincial governmental levels that all those engaged in flood risk management should proceed together. This has now been formulated in a legal framework by the EU Floods Directive. In terms of protective water management, this implies the need to coordinate federal and provincial administrative competences and to provide for the structures necessary to enable efficient cooperation. The aim is to integrate established methods into the new planning instruments or combine them to advantage. The results obtained so far from the preliminary assessment of flood risks in Austria as well as the progress made in the implementation of flood hazard and flood risk maps are discussed. The flood risk management plans are still in the design stage. First ideas are presented suggesting possible future developments for flood risk management in Austria. © 2012 Springer-Verlag. Source

Habersack H.,Christian Doppler Laboratory | Liedermann M.,Christian Doppler Laboratory | Tritthart M.,Christian Doppler Laboratory | Hauer C.,Christian Doppler Laboratory | And 3 more authors.
Osterreichische Wasser- und Abfallwirtschaft | Year: 2012

River engineering tasks have changed over time, starting originally from river training for flood protection, navigation, hydropower and agriculture. As a result, significant changes in sediment regimes and morphodynamics occurred, leading to riverbed degradation and related ecological deficits. Consequently, modern river engineering increasingly focuses on riverbed stabilization and restoration measures. Riverbed stabilization measures can be grouped into improvement of the sediment regime, increasing bed resistance to erosion, reducing energy slope and minimizing bed shear stress. Examples such as Granulometric Bed Improvement and increasing bed resistance to erosion explain the principle and effect of the measures. New groin forms and configurations demonstrate the potential integration of goals for navigation and ecology. The examples of riverbank restoration and sidearm reconnection primarily contribute to improving the ecological status, but also to riverbed stabilization and integrated flood risk management. © 2012 Springer-Verlag Wien. Source

Hengl M.,Institute For Wasserbau Und Hydrometrische Prufung | Krouzecky N.,Vienna University of Technology | Huber B.,Vienna University of Technology | Habersack H.,Christian Doppler Laboratory
Osterreichische Wasser- und Abfallwirtschaft | Year: 2012

The following article presents the suitability of physical pilot projects as planning tools for the development and checking of broad-scale bed stabilization methods in flowing waters. The planned granulometric bed improvement of the Danube east of Vienna, which was developed to halt the current bed erosion, serves as an example. In order to efficiently address all questions, two physical models had to be formulated and put into operation. The first model-a straightforward, basic one-was used to answer fundamental questions. The second-a fully developed model with typical three-dimensional flow situations-enabled us to verify the findings from its predecessor and to monitor additional destabilizing influences resulting from non-uniform turbulent speed variations. Overall, the pilot projects provided valuable information on the following aspects: the fundamental effectiveness of the planned measures; the influence of design irregularities on overall stability, and the river morphological processes to be expected. © 2012 Springer-Verlag Wien. Source

Hengl M.,Institute For Wasserbau Und Hydrometrische Prufung | Aufleger M.,University of Innsbruck | de Mas V.,Amt der Salzburger Landesregierung | Eggertsberger J.,Amt der Salzburger Landesregierung | And 8 more authors.
Osterreichische Wasser- und Abfallwirtschaft | Year: 2012

This example of the Lower Salzach's self-forming widening without bank reinforcements in the hinterland illustrates the complete process from creating a general concept of morphology- based measures, to planning and obtaining the necessary authorization, to the implementation and the first highly promising experiences from a hydrological year marked by a flood with a return period of once in 30 years. The idea of doing without state-of-the-art bank reinforcement techniques was a bold step on the part of the Bavarian and Austrian water management authorities. This not only serves the environment, but also saves the costs of building new bank reinforcements for the purpose of flood control that are normally necessary when rivers are widened. Self-forming widening is part of an overall concept employed to help the Lower Salzach gradually recover from its eroded state to a revitalized, morphologically dynamic and balanced one. It also creates a region that can simultaneously serve as an essential biotope and as a rest and recreation area for the local populace. © Springer-Verlag 2012. Source

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