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WRRL Operative Überwachung Seen

Die operative Überwachung wird an 67 Seen mit einer Seefläche größer 50 ha durchgeführt, welche die geltenden Umweltziele wahrscheinlich nicht erfüllen, um das Ausmaß und die Auswirkung der Belastungen und die Wirkung der durchgeführten Maßnahmen beurteilen zu können, sowie an Wasserkörpern, in die prioritäre Stoffe eingeleitet werden. Hierbei werden solche biologischen Qualitätskomponenten und stoffliche Parameter überwacht, die auf die Belastungen am empfindlichsten bzw. deutlichsten reagieren. Der Untersuchungsumfang wird während des Bewirtschaftungszeitraums den Erfordernissen angepasst.

WRRL Überblicksweise Überwachung Seen

Die überblicksweise Überwachung dient der Bewertung des Zustands und langfristiger Veränderungen und wird in Schleswig-Holstein an den fünf großen Seen größer 10 km² Seefläche durchgeführt. Eine überblicksweise chemische Überwachung findet mindestens einmal in sechs Jahren statt. Bei der biologischen Überwachung der Seen liegt das Intervall bei einem bis drei Jahren.

ADCP current measurements (600 kHz) on RV HEINCKE during RV HEINCKE cruise HE667

Ocean velocities were collected by a Teledyne RDI 600 kHz Workhorse Mariner ADCP that was mounted on RV HEINCKE during RV HEINCKE cruise HE667. The transducer was located at 4 m below the water line. The instrument was operated in single-ping, broadband mode with bin size of 1 m and a blanking distance of 1 m. The velocity of the ship was calculated from position fixes obtained by the Global Positioning System (GPS) received directly from RV HEINCKE. Heading, Pitch and Roll were obtained both from the MRU of RV HEINCKE and the internal ADCP gyro. Heading as well as pitch and roll data from ADCP's internal gyrocompass and the navigation and motion data were used by the data acquisition software ViSea DAS (AquaVision®) internally to convert ADCP velocities into earth coordinates. Accuracy of the ADCP velocities mainly depends on the quality of the position fixes and internal ADCP heading data. Further errors stem from a misalignment of the transducer with RV HEINCKE's centerline. ADCP data is provided at minutely sample rate. Raw data or secondly binned data are available on request.

ADCP current measurements (600 kHz) on 09.03.2023 during RV HEINCKE cruise HE614

Ocean velocities were collected by a Teledyne RD Instruments 600 kHz RiverRay ADCP that was mounted on an autonomous surface catamaran along a predefined transect pattern on March 09th 2023 during RV HEINCKE cruise HE614. The transducer was located at 0.257 m below the water line. The instrument was operated in single-ping, broadband mode with automatically selected bins (ranging from 0.1 - 0.8 m) depending on water depth and a blanking distance of 0.25 m. The catamaran's velocity was calculated from position fixes obtained by the Global Positioning System (GPS). Heading, pitch and roll data from the ADCP's internal gyrocompass and the navigation data were used by the data acquisition software ViSea DAS (AquaVision®) internally to convert ADCP velocities into earth coordinates. Accuracy of the ADCP velocities mainly depends on the quality of the position fixes and the catamaran's heading data.

Cruise EMB265 - Three-dimensional acoustic mapping of small-scale physical processes in the North Sea and Baltic Sea

During this short cruise, we explored the potential of acoustic echo sounding techniques (wideband single-beam and multibeam systems) for the quantitative investigation of turbulence and other small-scale processes in the water column. These activities were embedded in the research project „Four dimensional Research applying Modeling and Observations for the Sea and Atmosphere“ (FORMOSA), funded by the German Leibniz-Association (WGL) in the framework of the national funding line “Cooperative Excellence”. The cruise took place in May 2021 in the Kattegat region and the western Baltic Sea (Arkona Basin). Our activities focused on the mixing of salty North Sea waters and brackish outflow waters from the Baltic Sea in the Kattegat region with the help of turbulence microstructure and acoustic observations. Measurements were conducted by scientists from IOW in collaboration with project partners from Stockholm University (Sweden) and an additional engineering group from Rostock University (Germany).

ADCP current measurements (1200 kHz) during RV SENCKENBERG cruise SE202208-2

Ocean velocities were collected by a Teledyne RDI 1200 kHz Workhorse Sentinel II ADCP that was mounted on RV SENCKENBERG during RV SENCKENBERG cruise SE202208-2. The transducer was located at 1.5 m below the water line. The instrument was operated in single-ping, broadband mode with bin size of 0.25 m and a blanking distance of 0.25 m. The velocity of the ship was calculated from position fixes obtained by the Global Positioning System (GPS) received at a Trimble SPS461 Modular GPS Heading Receiver. Heading was obtained both from the Trimble receiver and the internal ADCP gyro. Heading as well as pitch and roll data from ADCP's internal gyrocompass and the navigation data were used by the data acquisition software ViSea DAS (AquaVision®) internally to convert ADCP velocities into earth coordinates. Accuracy of the ADCP velocities mainly depends on the quality of the position fixes as well as Trimble receiver and internal ADCP heading data. Further errors stem from a misalignment of the transducer with RV SENCKENBERG's centerline.

ADCP current measurements (1200 kHz) during RV SENCKENBERG cruise SE202208-1

Ocean velocities were collected by a Teledyne RDI 1200 kHz Workhorse Sentinel II ADCP that was mounted on RV SENCKENBERG during RV SENCKENBERG cruise SE202208-1. The transducer was located at 1.5 m below the water line. The instrument was operated in single-ping, broadband mode with bin size of 0.25 m and a blanking distance of 0.25 m. The velocity of the ship was calculated from position fixes obtained by the Global Positioning System (GPS) received at a Trimble SPS461 Modular GPS Heading Receiver. Heading was obtained both from the Trimble receiver and the internal ADCP gyro. Heading as well as pitch and roll data from ADCP's internal gyrocompass and the navigation data were used by the data acquisition software ViSea DAS (AquaVision®) internally to convert ADCP velocities into earth coordinates. Accuracy of the ADCP velocities mainly depends on the quality of the position fixes as well as Trimble receiver and internal ADCP heading data. Further errors stem from a misalignment of the transducer with RV SENCKENBERG's centerline.

Shipboard Acoustic Doppler Current Profiler measurements during R/V Littorina cruise L10-22

Vessel-mounted Acoustic Doppler Current Profiler (ADCP) measurements were carried out to acquire velocity profiles at two sites north (start: latitude & longitude: 54.229515,7.8437233) and northwest (start: latitude & longitude: 54.20431,7.862079) of Helgoland (Germany) during neap tide in June 2022 (29.06.2022 and 30.06.2022). The parallel transect method was adopted to acquire data over a semidiurnal tidal cycle that spanned 13 hours. On both days, surveys were conducted in a way where all the transects were traversed multiple times only from one direction. Each transect was ~1500 m and had a spacing of ~150 m. With a vessel speed of ~4 to 5 knots, each circuit formed by the 4 transect lines was traversed about ~13 times during the survey period of 13 hours. The measurements were conducted in bottom tracking mode with a 614.4-kHz Teledyne RD Instruments WorkHorse broadband ADCP. The ADCP was installed in convex and Janus configuration with a beam angle of 20 degrees to the supporting pole from the starboard side of the ship FK Littorina. The transducer face of the ADCP was 1.16 m below the water level, with a blank after transmitting (WF) set to 0.44 m. The ADCP was operated in a dynamic sea state (WM1) profiling mode with a depth cell length (WS) of 0.5 m and a total of 80 depth cells (WN). The bottom track pings per ensemble (BP) and pings per ensemble (WP) were set to 1; thus, 1 ensemble has 2 pings. The depth range covered by the ADCP is 2.10 m to 41.60 m. The data acquisition software ViSea DAS from Aqua Vision (https://aquavision.nl/services/visea-users/) used pitch and roll data from the ADCP's internal built-in motion reference unit and navigation and heading data from an auxiliary unit onboard the research vessel on a serial RS-232 interface to convert ADCP velocities into earth coordinates. The navigational data received correction signals to receive RTK "fix" status during the survey period, and the ADCP offsets were determined before the surveys to ensure the thoroughness and reliability of the data collection process.

ADCP current measurements (1200 kHz) during RV SENCKENBERG cruise SE202206-1

Ocean velocities were collected by a Teledyne RDI 1200 kHz Workhorse Sentinel II ADCP that was mounted on RV SENCKENBERG during RV SENCKENBERG cruise SE202206-1. The transducer was located at 1.5 m below the water line. The instrument was operated in single-ping, broadband mode with bin size of 0.25 m and a blanking distance of 0.25 m. The velocity of the ship was calculated from position fixes obtained by the Global Positioning System (GPS) received at a Trimble SPS461 Modular GPS Heading Receiver. Heading was obtained both from the Trimble receiver and the internal ADCP gyro. Heading as well as pitch and roll data from ADCP's internal gyrocompass and the navigation data were used by the data acquisition software ViSea DAS (AquaVision®) internally to convert ADCP velocities into earth coordinates. Accuracy of the ADCP velocities mainly depends on the quality of the position fixes as well as Trimble receiver and internal ADCP heading data. Further errors stem from a misalignment of the transducer with RV SENCKENBERG's centerline.

ADCP current measurements (1200 kHz) during RV SENCKENBERG cruise SE202203-2

Ocean velocities were collected by a Teledyne RDI 1200 kHz Workhorse Sentinel II ADCP that was mounted on RV SENCKENBERG during RV SENCKENBERG cruise SE202203-2. The transducer was located at 1.5 m below the water line. The instrument was operated in single-ping, broadband mode with bin size of 0.25 m and a blanking distance of 0.25 m. The velocity of the ship was calculated from position fixes obtained by the Global Positioning System (GPS) received at a Trimble SPS461 Modular GPS Heading Receiver. Heading was obtained both from the Trimble receiver and the internal ADCP gyro. Heading as well as pitch and roll data from ADCP's internal gyrocompass and the navigation data were used by the data acquisition software ViSea DAS (AquaVision®) internally to convert ADCP velocities into earth coordinates. Accuracy of the ADCP velocities mainly depends on the quality of the position fixes as well as Trimble receiver and internal ADCP heading data. Further errors stem from a misalignment of the transducer with RV SENCKENBERG's centerline.

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