Assessing river-floodplain connectivity based on two-dimensional hydrodynamical modeling
Abstract
The Danube floodplains Gemenc-forest and Béda-Karapancsa in Hungary hold high natural value, (also) due to their great spatial extent. The bed levels of the Danube River and of the side-arms are slowly drawing away from each other, which is caused by their continuous deepening and siltening, respectively. Without further measures, this forecasts severe ecological consequences. A running morphodynamic research aims to reveal the current condition and to suggest a long-term maintainable state. Hereby we present the first results of the hydrodynamical simulations and give an example on assessing the lateral connectivity. We apply a classification method used previously in flood hazard assessment, based on water depths and flow velocities. The categories of this method seem to correspond to the potamal classes, which tend to be less-explicitly applicable. Some refinement is still due, regarding the digital terrain model data. However, the methodology presented here can support assessing present conditions and it provides information for the impact analysis of any future intervention, concerning sheer hydrodynamics or ecohydraulics as well.
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