Abstract
Hydromorphological alterations of large rivers are evident and have to be related to multiple anthropogenic pressures. The presented results of an integrated study concerning the actual status of the hydromorphology of the Danube River Basin show that in particular, the sediment regime features a heavily disturbed system at various scales. Combined impacts of flood protection, navigation and hydropower measures applied over a long period of time have been identified based on the river-scaling concept (RSC) for being responsible for these specific alterations (lack of bed load and suspended load in the remaining free-flowing sections). Moreover, long sections of the Danube River have been narrowed, channelized, disconnected from floodplains and morphologically degraded over the last 200 years. This has caused increased bottom shear stresses, increased sediment transport capacities and in addition a lack of lateral self-forming processes and corresponding reduced morphodynamics in the non-impounded sections. As a consequence of both longitudinal and lateral disturbances of the sediment supply and additional impacts of the channelization, the remaining free-flowing sections are subject to various forms of river bed degradation. Such degradation or river bed incision leads to a loss of instream structures in general, with a disappearance of gravel bars at the Upper Danube, and changes of sandbars at the Lower Danube. Hence, for river systems and large river basins, it has to be stated that the preservation and restoration of morphodynamics is one of the most relevant issues for river engineering and ecology. This has to be considered especially for the implementation of legal directives and/or future river basin management plans.
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Acknowledgements
The authors want to thank the European Commission for financing the TREN/FP7TR/218362/“PLATINA”– project. Additionally, the financial support by the Federal Ministry of Economy, Family and Youth and the National Foundation of Research, Technology and Development is gratefully acknowledged. Moreover, the authors are grateful to Bernhard Schober and Daniel Haspel for their contribution in editing graphics and tables. The authors want to thank Taylor & Francis to grant non-exclusive permission to reproduce the major part of the article reference 9, to be found in www.tandfonline.com.
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Habersack, H., Jäger, E., Hauer, C. (2014). Danube River Sediment Transport and Morphodynamics. In: Liska, I. (eds) The Danube River Basin. The Handbook of Environmental Chemistry, vol 39. Springer, Berlin, Heidelberg. https://doi.org/10.1007/698_2014_314
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DOI: https://doi.org/10.1007/698_2014_314
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