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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Numerical analysis of the effects of engineering measures on the lower danube
Numerical analysis of the effects of engineering measures on the lower danube
Author : KURT GLOCK(1), MICHAEL TRITTHART(1), PHILIPP GMEINER(1), SEBASTIAN PESSENLEHNER(1), CHRISTOPH HAUER(1) & HELMUT HABERSACK(1)
ABSTRACT
In large rivers conflicts between anthropogenic uses and ecological sustainability are increasing due to the growing
number of different interests. The Danube, as part of a pan-European inland transport link between Rotterdam (North Sea)
and Constanta (Black Sea) represents a high priority navigation fairway. At the same time the Danube is important from an
ecological perspective, e.g for sturgeon spawning and habitat. The investigation area of this study represents a widely
intact bifurcation zone in the Lower Danube. Due to a significant erosion of the river bed in the northern arm a successive
change in discharge distribution towards this arm occurs. This results in a decrease of water depth in the southern arm,
requiring a detour for navigation of about 110 km on the way to the Black Sea. In this study different theoretical hydraulic
engineering measures have been assessed with the goal of increasing the discharge in the southern arm. This is expected
to lead to necessary water depths for navigation, thereby also considering a minimized impact on fish migration (in
particular sturgeons). On the basis of a 3D hydrodynamic numerical model the impacts of the different measures were
predicted and analysed. The objectives of the 3D modelling task were thus given by (i) determination of hydrodynamic
variables (i.e., flow velocities, water surface elevations, turbulence properties); (ii) determination of sediment transport
characteristics (i.e., suspended sediment concentrations) and the associated alteration of hydromorphology; (iii) analysis
of the impact of the simulated hydraulic parameters on fish migration; due to the construction works planned. The
hydrodynamic simulations were performed using the model RSim-3D, while the morphodynamic processes were
computed employing non-uniform transport equations embedded in the newly developed sediment transport model iSed.
The results show that transverse structures in the northern arm, dredging in the southern arm as well as a spur dike at the
bifurcation might not lead to the desired success. The most promising alternative considering discharge distribution, water
depths for navigation and fish migration might be a modification of the river course.
File Size : 1,115,302 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 19/08/2015
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