Ocean current measurements inside the Anholt Offshore Wind Farm (Kattegat, Denmark)

Study area, survey design and sampling techniques Measurements were conducted within the Anholt offshore wind farm (OWF) in the Kattegat, Denmark, which comprises 111 wind turbines with a total installed capacity of 400 MW. The site is characterized by predominantly northward currents, with maximum speeds of approximately 0.4 m/s and relatively weak tidal currents. Two acoustic Doppler current profilers (ADCPs) were deployed upstream and downstream of a single monopile to measure vertical profiles of currents over a period of nine days, from 19 to 28 August 2024. Deployment locations were selected to minimize interference from neighboring structures while complying with the required 200 m safety distance from submarine cables. The upstream station, equipped with a Nortek ECO ADCP, was located approximately 400 m from the nearest monopile. At the downstream station, located approximately 200 m away from the monopile, an upward-facing 1 MHz Nortek Aquadopp ADCP mounted in a bottom frame at 17 m depth was deployed to provide high-resolution current profiles downstream of the monopile. A more detailed description of the study area, sampling techniques and post-processing of the ADCP data is described in Mohn et al. (2025). The key attributes of the data set provided here is described in the table below. ADCP Depth range Time interval Sampling period Variables File name Nortek-ECO Single depth level 6.78m 2 minutes 207 hours starting at 19-Aug-2024, 08:00 Time, depth, u, v Upstream_ADCP_uv_velocity_1.csv Nortek-ECO Single depth level 8.91m 2 minutes 207 hours starting at 19-Aug-2024, 08:00 Time, depth, u, v Upstream_ADCP_uv_velocity_2.csv Nortek-ECO Single depth level 11.04 m 2 minutes 207 hours starting at 19-Aug-2024, 08:00 Time, depth, u, v Upstream_ADCP_uv_velocity_3.csv Nortek-Aquadopp 1 MHz 2.25m – 16m with a bin size of 0.25 m 10 minutes 208.83333 hours starting at 19-Aug-2024, 20:00 Time, depth, u Downstream_ADCP_u_velocity.csv Nortek-Aquadopp 1 MHz 2.25m – 16m with a bin size of 0.25 m 10 minutes 208.83333 hours starting at 19-Aug-2024, 20:00 Time, depth, v Downstream_ADCP_v_velocity.csv Reference: Mohn, C., Maar, M., Larsen, J. 2025. Ocean currents and water mass properties inside the Anholt Offshore Wind Farm (Kattegat, Denmark) Aarhus University, DCE – Danish Centre for Environment and Energy, 30 pp. Technical Report No. 341.