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The Integrated River Engineering Project on the Danube to the East of Vienna River Bed Stabilisation by Coarsening of Bed Material – Section Model Tests

The deepening of the river bed of the Danube to the east to Vienna has brought a lowering of the water level, which has negative effects on ecology and water balance. The rehabilitation project comprises several measures. The most significant one is the granulometric bed improvement (GBI) to stabilise the river bed by coarsening the bed material by a gravel layer of grain sizes within the grading curve of the river. Hydraulic model tests were conducted in a 2 m wide and approx. 30 m long channel at a scale of 1:10 in order to investigate the behaviour of the added material. It was verified that the layer of coarse gravel withstands the local bed shear stress at the highest navigable water level. Beyond this discharge level the added layer of coarse gravel mixes with the natural bed load at areas of larger local stress due to locally limited erosion of the added layer and consequent scour building.