Data presented here were collected between September 2018 to September 2023 within the research unit DynaCom (Spatial community ecology in highly dynamic landscapes: From island biogeography to metaecosystems) involving the Universities of Oldenburg, Göttingen, and Münster, the iDiv Leipzig and the Nationalpark Niedersächsisches Wattenmeer. Experimental islands and saltmarsh enclosed plots were established in the back-barrier tidal flat and in the saltmarsh zone of the island of Spiekeroog (Germany). To measure local turbidity, a turbidity recorder equipped with a Seapoint® turbidity meter (RBRsolo Tu, RBR Ltd., Ontario/Canada) was installed in the back-barrier tidal flat near the experimental islands in a shallow tidal creek (0.9 m NHN). Another one was installed at the saltmarsh edge (1.2 m NHN). Both loggers were bottom mounted through a steel girder (buried 0.3 m deep in the sediment) and were positioned 15 cm above sediment surface, as was determined by using a portable differential GPS. This resulted in the sensor falling dry during low tide. The turbidity recorders were pre-calibrated by the manufacturer (Seapoint Sensors, Inc., NH/USA). Recorded data were internally logged and exported using Ruskin software V2.24.3.x (RBR Ltd., Ontario/Canada). Subsequent data processing was done using MATLAB (R2024b). Post-processing and quality control included the removal of (a) low tide data (sensors exposed to air), (b) data covering maintenance activities, (c) data affected by biofouling, and (d) implausible values, i.e. negative values and values exceeding the linear response range of the sensor (1250 NTU). According to manufacturer specifications, the linear measurement range extends up to 1250 NTU, while 750 NTU represent a more conservative estimate of linearity. Therefore, 1250 NTU was adopted as the upper threshold for valid measurements in this dataset.
Data presented here were collected between November 2019 to September 2023 within the research unit DynaCom (Spatial community ecology in highly dynamic landscapes: From island biogeography to metaecosystems, https://uol.de/dynacom/ ) involving the Universities of Oldenburg, Göttingen, and Münster, the iDiv Leipzig and the Nationalpark Niedersächsisches Wattenmeer. Experimental islands and saltmarsh enclosed plots were established in the back-barrier tidal flat and in the saltmarsh zone of the island of Spiekeroog (Germany). A recording current meter (RCM; SEAGUARD® Recording Current Meter, Aanderaa Data Instruments AS, Bergen/Norway) was installed in the back-barrier tidal flat near the experimental islands. The sensor was bottom-mounted in a shallow tidal creek (0.59 m NHN) using a steel girder buried in the sediment, which caused the sensor to be exposed during low tide. All low-tide data have been removed from the dataset. The system was equipped with a ZPulse Doppler Current Sensor (DCS), a conductivity sensor, an oxygen optode, and two analogue sensors for chlorophyll-a and turbidity (16445). All sensors were pre-calibrated by the manufacturer. Recorded data were internally logged until readout with the SeaGuard Studio software (V1.5.23). Salinity was derived in the SeaGuard Studio software using temperature-dependent, nonlinear seawater conductivity compensation following the Practical Salinity Scale (PSS-78). Subsequent data processing was done using MATLAB (R2024b). Turbidity and chlorophyll-a data were excluded from the final dataset, as the recorded signals show implausible values and did not pass quality-control criteria. Post-processing and quality control included (a) the removal of low tide data, data covering maintenance activities, and data affected by biofouling, (b) the removal of implausible values, c) an outlier detection using the Hampel filter method, and (d) visual checks. Identified outlier were removed and synchronously removed across all associated parameters of the respective sensor.
Das Projekt SteelBlade beschäftigt sich mit der Entwicklung und Konstruktion eines Onshore Rotorblattes für Windenergieanlagen, das für den Einsatz des Werkstoffs Stahl optimiert wird. Leichtbau- und Optimierungsmethoden aus der Luft- und Raumfahrt sowie dem Fahrzeugbau sollen den effizienten Einsatz des Werkstoffes sichern. Durch eine gleichzeitige Akustik-Optimierung der Struktur kann die Umweltbelastung durch Schallemissionen für Mensch und Tier kontrolliert und gesenkt werden. Der Fokus bei der Entwicklung des Stahlrotorblattes liegt auf der Konstruktion der inneren Struktur sowie der Auslegung einer Blattaußenhülle, die auf Basis aerodynamischer Gesichtspunkte entwickelt wird. Die Konstruktion des Stahlrotorblattes erfolgt durch konsequente Leichtbaumethodik, um das Gesamtgewicht des Stahlblattes auf dem Niveau des GFK-Blattes zu halten. Um die Anwendbarkeit der Neuentwicklung zu gewährleisten, wird Novicos insbesondere das akustische Verhalten mitbetrachten, insbesondere vor dem Hintergrund des geänderten Körperschalltransfers sowie geringerer Dämpfung des Werkstoffs Stahl. Aufgrund der sehr großen Systeme, sowie der Relevanz des Doppler-Effektes bei rotierenden schallemittierenden Oberflächen, wird der Einfluss der neu entwickelten Blattkonstruktion auf die WEA-Schallemission mithilfe der Boundary-Elemente-Methode (BEM) bestimmt. Im Rahmen dieses Projektes wird Novicos das schnelle BEM-Verfahren der hierarchischen Matrizen mit geschachtelten Clusterbasen an die speziellen Anforderungen der Schallemissionssimulation von Windenergieanlagen anpassen. Dies umfasst Berücksichtigung der Bodeneigenschaften sowie des Doppler-Effekts wie die Ausnutzung von WEA-Oberflächensymmetrien zur Verringerung des Rechenaufwands. Basierend auf den Erweiterungen des schnellen BEM-Lösers wird Novicos die Konstruktionsvarianten des Rotorblattes für die betrachteten WEA-Konzepte analysieren und unter akustischen Gesichtspunkten bewerten.