Blar i Geophysical Institute på forfatter "Reuder, Joachim"
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Analysis of a low-level coastal jet off the western coast of Norway
Christakos, Konstantinos; Varlas, Georgios; Reuder, Joachim; Katsafados, Petros; Papadopoulos, Anastasios (Peer reviewed; Journal article, 2014)Offshore wind installations depend strongly on an improved knowledge of the atmospheric and ocean conditions affecting the marine atmospheric boundary layer (MABL). In particular the better understanding of atmospheric ... -
Analysis of the vertical temperature structure in the Bergen valley, Norway, and its connection to pollution episodes
Wolf, Tobias; Esau, Igor; Reuder, Joachim (Peer reviewed; Journal article, 2014-09)The vertical temperature profile in the lowest 1000m of the atmosphere determines a number of important physical processes and meteorological phenomena such as high concentrations of anthropogenic air pollutants in urban ... -
Assessment of wind conditions at a fjord inlet by complementary use of sonic anemometers and lidars
Jakobsen, Jasna Bogunovic; Cheynet, Etienne; Snæbjörnsson, Jonas Thor; Mikkelsen, Torben; Sjøholm, Mikael; Angelou, Nicolas; Hansen, Per; Mann, Jakob; Svardal, Benny; Kumer, Valerie-Marie; Reuder, Joachim (Peer reviewed; Journal article, 2015-12-02)Wind velocity measurement devices based on the remote optical sensing, lidars, are extensively applied in wind energy research and wind farm operation. The present paper demonstrates the relevance and potential of lidar ... -
Atmospheric Drivers of Wind Turbine Blade Leading Edge Erosion: Review and Recommendations for Future Research
Pryor, Sara C.; Barthelmie, Rebecca Jane; Cadence, Jeremy; Dellwik, Ebba; Hasager, Charlotte Bay; Kral, Stephan Thomas; Reuder, Joachim; Rodgers, Marianne; Veraart, Marijn (Journal article; Peer reviewed, 2022)Leading edge erosion (LEE) of wind turbine blades causes decreased aerodynamic performance leading to lower power production and revenue and increased operations and maintenance costs. LEE is caused primarily by materials ... -
Automated Measurements of Whitecaps on the Ocean Surface from a Buoy-Mounted Camera
Paskyabi, Mostafa Bakhoday; Reuder, Joachim; Flügge, Martin (Peer reviewed; Journal article, 2016-12)We quantify the percentage of sea surface covered by whitecaps from images taken by a non-stationary camera mounted on a moored buoy using an Adaptive Thresholding Segmentation (ATS) method and an Iterative Between Class ... -
The BLLAST field experiment: Boundary-Layer late afternoon and sunset turbulence
Lothon, Marie; Louhou, Fabienne; Pino, David; Couvreux, Fleur; Pardyjak, Erik; Reuder, Joachim; Vilà-Guerau De Arellano, Jordi; Durand, Pierre; Hartogensis, Oscar K.; Legain, Dominique; Augustin, Patrick V.; Gioli, Beniamino; Lenschow, Donald H.; Faloona, Ian C.; Yagüe, Carlos; Alexander, Daniel C.; Angevine, Wayne M.; Bargain, Erwan; Barrié, Joël; Bazile, Eric; Bezombes, Yannick; Blay-Carreras, Estel; Van De Boer, Anneke; Boichard, Jean Luc; Bourdon, Anne; Butet, Alain; Campistron, Bernard A.; De Coster, Olivier; Cuxart, Joan; Dabas, Alain M.; Darbieu, Clara; Deboudt, Karine; Delbarre, Hervé; Derrien, Solène; Flament, Pascal; Fourmentin, Marc; Garai, Anirban; Gibert, Fabien; Graf, Alexander T.; Gröbner, Julian; Guichard, Françoise; Jiménez, Mantonia Antonia; Jonassen, Marius Opsanger; Van Den Kroonenberg, Aline C.; Magliulo, Vincenzo; Martin, Sabrina; Martinez, Daniel; Mastrorillo, Laurence; Moene, Arnold F.; Molinos, Francisco Lendinez; Moulin, Emilie; Pietersen, Henk P.; Piguet, Bruno; Pique, Eric; Román-Cascón, Carlos; Rufin-Soler, Caroline; Saïd, Frédérique; Sastre-Marugán, Mariano; Seity, Yann; Steeneveld, Gert Jan; Toscano, Piero; Traullé, Olivier; Tzanos, Diane; Wacker, Stefan; Wildmann, Norman; Zaldei, Alessandro (Peer reviewed; Journal article, 2014-10-16)Due to the major role of the sun in heating the earth's surface, the atmospheric planetary boundary layer over land is inherently marked by a diurnal cycle. The afternoon transition, the period of the day that connects the ... -
Characterisation of Single Wind Turbine Wakes with Static and Scanning WINTWEX-W LiDAR Data
Kumer, Valerie-Marie; Reuder, Joachim; Svardal, Benny; Sætre, Camilla; Eecen, Peter (Peer reviewed; Journal article, 2015)With further development of LiDAR technology wake measurements by use of LiDAR became of common interest in the wind energy community. To study new measurement strategies of scanning and nacelle LiDARs, in combination with ... -
Characterization of Terrain-Induced Turbulence by Large-Eddy Simulation for Air Safety Considerations in Airport Siting
Wang, Sai; De Roo, Frederik; Thobois, Ludovic; Reuder, Joachim (Journal article; Peer reviewed, 2022)Topography-induced turbulence poses a potential hazard for aviation safety, in particular during the final approach and landing. In this context, it is essential to assure that the impact of topography-induced turbulence ... -
Characterization of the SUMO Turbulence Measurement System for Wind Turbine Wake Assessment
Båserud, Line; Flügge, Martin; Bhandari, Anak; Reuder, Joachim (Peer reviewed; Journal article, 2014)The remotely piloted aircraft system (RPAS) SUMO (Small Unmanned Meteorological Observer) has been equipped with a miniaturized 5-hole probe sensor system for measurement of the 3-dimensional flow vector with a temporal ... -
Characterization of turbulence in wind turbine wakes under different stability conditions from static Doppler LiDAR measurements
Kumer, Valerie-Marie; Reuder, Joachim; Eikill, Rannveig (Peer reviewed; Journal article, 2017-03-05)Wake characteristics are of great importance for wind park performance and turbine loads. While wind tunnel experiments provided a solid base for the basic understanding of the structure and dynamics of wind turbine wakes, ... -
Comparison of direct covariance flux measurements from an offshore tower and a buoy
Flügge, Martin; Bakhoday Paskyabi, Mostafa; Reuder, Joachim; Edson, James B.; Plueddemann, Albert J. (Peer reviewed; Journal article, 2016-05)Direct covariance flux (DCF) measurements taken from floating platforms are contaminated by wave-induced platform motions that need to be removed before computation of the turbulent fluxes. Several correction algorithms ... -
A Comparison of LiDAR and Radiosonde Wind Measurements
Kumer, Valerie-Marie; Reuder, Joachim; Furevik, Birgitte Rugaard (Peer reviewed; Journal article, 2014)Doppler LiDAR measurements are already well established in the wind energy research and their accuracy has been tested against met mast data up to 100 m above ground. However, the new generation of scanning LiDAR have a ... -
The COTUR project: remote sensing of offshore turbulence for wind energy application
Cheynet, Etienne; Flügge, Martin; Reuder, Joachim; Jakobsen, Jasna Bogunovic; Heggelund, Yngve; Svardal, Benny; Saavedra Garfias, Pablo Andres; Obhrai, Charlotte; Daniotti, Nicolo; Berge, Jarle; Duscha, Christiane Anabell; Wildmann, Norman; Onarheim, Ingrid Husøy; Godvik, Marte (Journal article; Peer reviewed, 2021)The paper presents the measurement strategy and data set collected during the COTUR (COherence of TURbulence with lidars) campaign. This field experiment took place from February 2019 to April 2020 on the southwestern coast ... -
The Departure from Mixed-Layer Similarity During the Afternoon Decay of Turbulence in the Free-Convective Boundary Layer: Results from Large-Eddy Simulations
Elguernaoui, Omar; Reuder, Joachim; Li, Dan; Maronga, Bjørn; Bakhoday Paskyabi, Mostafa; Wolf, Tobias; Esau, Igor (Journal article; Peer reviewed, 2023)This study analyses the departure of the velocity-variances profiles from their quasi-steady state described by the mixed-layer similarity, using large-eddy simulations with different prescribed shapes and time scales of ... -
Development of an automatic thresholding method for wake meandering studies and its application to the data set from scanning wind lidar
Krutova, Maria; Paskyabi, Mostafa Bakhoday; Reuder, Joachim; Nielsen, Finn Gunnar (Journal article; Peer reviewed, 2022)Wake meandering studies require knowledge of the instantaneous wake evolution. Scanning lidar data are used to identify the wind flow behind offshore wind turbines but do not immediately reveal the wake edges and centerline. ... -
Diurnal Circulation of the Bolivan Altiplano. Part I: Observations
Egger, Joseph; Blacutt, Luis; Ghezzi, Flavio; Heinrich, Richard; Kolb, Philip; Lämmlein, Stephan; Leeb, Martin; Mayer, Stephanie; Palenque, Eduardo; Reuder, Joachim; Schäper, Wolfgang; Schween, Jan; Torrez, Rene; Zaratti, Francesco (Journal article, 2005-04)In July and August 2003 a field campaign was conducted to explore the diurnal circulation of the Bolivian Altiplano. Vertical soundings by remote-controlled aircraft yielded profiles of temperature, pressure, and humidity ... -
Downscaling an intense precipitation event in complex terrain: the importance of high grid resolution
Pontoppidan, Marie; Reuder, Joachim; Mayer, Stephanie; Kolstad, Erik Wilhelm (Peer reviewed; Journal article, 2017)Floods due to intense rainfall are a major hazard to both people and infrastructure in western Norway. Here steep orography enhances precipitation and the complex terrain channels the runoff into narrow valleys and small ... -
Effects of altitude and aerosol on UV radiation
Pfeifer, M.; Koepke, P.; Reuder, Joachim (Journal article, 2006-01-10)Measurements of erythemally weighted UV radiation during about 600 days at different sites in Bolivia and Germany ranging from 550 to 5240 m above sea level have been used to derive the altitude effect AE under cloud-free ... -
Evaluation of different wind fields for the investigation of the dynamic response of offshore wind turbines
Nybø, Astrid; Nielsen, Finn Gunnar; Reuder, Joachim; Godvik, Marte; Churchfield, Matthew J. (Journal article; Peer reviewed, 2020)As the size of offshore wind turbines increases, a realistic representation of the spatiotemporal distribution of the incident wind field becomes crucial for modeling the dynamic response of the turbine. The International ... -
Evaluation of Gaussian wake models under different atmospheric stability conditions: Comparison with large eddy simulation results
Krutova, Maria; Bakhoday Paskyabi, Mostafa; Reuder, Joachim; Nielsen, Finn Gunnar (Journal article; Peer reviewed, 2020)The calculation of the velocity deficit in the wake of individual wind turbines is a fundamental part of the wind farm analysis. A good approximation of the wake deficit behind a single wind turbine will improve the power ...