Over the past 15 to 20 years, almost no rehabilitation measures were conducted at the low water regulation structures (especially groynes and longitudinal training walls) in the free flowing section east of Vienna. In fairway stretches prone to sedimentation, so-called ford areas, this development is particularly critical. Effective low water regulation allows for the use of greater fairway depths and reduces the risk of vessels running aground.
In the course of this project, an aerial laser scan survey was conducted to measure the low water regulation structures in both free flowing sections of the Austrian Danube. In order to capture the underwater geometry of the structures, the laser scans were complemented by multi-beam surveying results. Based on this data, the individual structures in need of rehabilitation were assessed and a prioritisation was established. Consequently, one groyne was extended and renovated at the ford Petronell-Witzelsdorf to ensure the complete functionality of the hydraulic structure.
- identification of individual structures in need for rehabilitation in the priority areas east of Vienna (2016)
- project planning of the structural implementation of the "aftercare" or optimisation measures at the ford Petronell-Witzelsdorf (2017)
- implementation of the optimisation measure at the ford Petronell-Witzelsdorf (the extension of one groyne was completed by the end of 2017; armourstones will be removed in Q1/2018)