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Investigations of ship-induced waves on the Austrian Danube in the Donau-Auen National Park

Investigations of ship-induced waves on the Austrian Danube in the Donau-Auen National Park Part 2 – Observations. N. Krouzecky, J. D. Fenton, B . Huber, G. Klasz. Vienna University of Technology Institute of Hydraulic Engineering and Water Resources Management

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Investigations of ship-induced waves on the Austrian Danube in the Donau-Auen National Park

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  1. Investigations of ship-induced waves on the Austrian Danube in the Donau-Auen National Park Part 2 – Observations N. Krouzecky, J. D. Fenton, B. Huber, G. Klasz Vienna University of Technology Institute of Hydraulic Engineering and Water Resources Management Department of Hydraulic Engineering, Karlsplatz 13/222-1, A-1040 Vienna Spectra Self-propelled barge This was a typical self-propelled barge, travelling slowly upstream, heavily laden, with a strong bow wave. It is surprising that, relative to others, this bulky vessel with a strong disturbance, only created a small downsurge and relatively small and short waves, although these continued for a long time. The persistence of disturbances to the river from several vessels, partly due to strong reflections, was surprising to the observers. Fast passenger catamaran The “Twin City Liner” ‒ a very different situation, where the vessel was a fast passenger catamaran, clearly travelling at supercritical velocity. There was no downsurge, but the waves created were largest and longest of all the vessels we observed. In fact, this vessel made several passes during the day, as it has a regular service between Vienna and Bratislava. The highest waves were 0.4m, while the clear spectral peak was at about 3s period. There were some reflections, but the disturbances to the river died down relatively quickly. Motorboat A large, but transitory effect was that caused by a single small but fast-moving motorboat. The effects were only slightly smaller than those due to the large passenger catamaran above, and the disturbances also decayed quickly. Passenger cruise boat The last is another type of vessel very common to the Danube, a large passenger cruise boat. Unlike commercial vessels, this was well streamlined It is notable and surprising that the wave system generated was as large as it was. The downsurge was as large as that of a huge combination of three barges arranged transversely observed earlier, while the waves were not much smaller than for that vessel (or for a vessel similar to that, the self-propelled barge above).

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