The overall objective of OpenRAVE is to continue expanding the valuable and globally unique data set of measurements at alpha ventus and to enable research projects to access this data. The uniform and automated quality control of the measurement data will be continued and further developed. In-situ sea state data from German measuring sites will continue to be pooled and made available in a uniform way on the sea state portal. For this purpose, four additional sea state measuring sites will be set up in German offshore wind farms and the data from the sea state stations of the state authorities as well as research institutions will be acquired. In addition, highly specialized sea state data products for the offshore wind industry and research are created.

Further information on the measuring service can be found under Measurements and Data Management and Oceanography.

Further information and general data on the OpenRAVE project can also be found here on the website of the Federal Maritime and Hydrographic Agency (BSH).

For more information on RAVE coordination by Fraunhofer IWES, see Project Coordination.

Duration of the project:
02/2020 – 01/2025


Development of online modules for sea state evaluations to optimize the logistics of offshore operations

The wind, wave and current data provided will be analyzed regarding their correlation and interaction. The measuring sites will be linked to each other to create an area-wide assessment basis in the German Bight for offshore logistic vessel operations and to define design parameters based on the development combinations.

Duration of the subproject: 


Aims of the project

The Ludwig-Franzius-Institut (LuFI) contributes the following work packages:

  • Correlating environmental data, wind-wave and directional dependencies, as well as the influence of wind speed and duration on the reaction time of the sea state.
  • In order to take into account location dependent tidal influences, analytical approaches will be optimized for the quantification of influence of currents on waves by means of measurement data from the sea state portal.
  • For the optimization of time windows for offshore operations, the results from wind, wave and current analyses are linked with the motion characteristics of generic work vessels, which are linked to and contributed by the joint research project "AVIMo" (FKZ: 0324350A). In “AVIMo”, physical and numerical modeling is used to investigate the relationship of the work vessel’s sea-keeping and the interlinked limitations of work operations at offshore wind farms. The resulting limitations of the work vessels provide input for the sea state modules and for illustrated maps of the German Bight. The analyzed and extrapolated environmental data in connection to the sea-keeping properties assist cost estimations and forecasts of the operational capability of offshore work vessels.
  • Finally, the data interfaces for the implementation of the modules into the sea state portal as well as automatic updating functions are developed.



Mayumi Wilms
BSH - Federal Maritime and Hydrographic Agency

Project Management  

Arndt Hildebrandt
Ludwig-Franzius-Institute for Hydraulic, Estuarine and Coastal Engineering


Lukas Fröhling
Ludwig-Franzius-Institute for Hydraulic, Estuarine and Coastal Engineering