Search publications of the members of the Royal Belgian institute of natural Sciences
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Evaluation carpologique et archéozoologique du puits-latrines gallo-romain de Warnach (Fauvillers) F002
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Etude archéozoologique de Beauraing – Rue de Revogne Occupations urbaines du Bas Moyen Age (13e-15e siècles)
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Data assimilation with the ensemble Kalman filter in a numerical model of the North Sea
- Coastal management and maritime safety strongly rely on accurate representations of the sea state. Both dynamical models and observations provide abundant pieces of information. However, none of them provides the complete picture. The assimilation of observations into models is one way to improve our knowledge of the ocean state. Its application in coastal models remains challenging because of the wide range of temporal and spatial variabilities of the processes involved. This study investigates the assimilation of temperature profiles with the ensemble Kalman filter in 3-D North Sea simulations. The model error is represented by the standard deviation of an ensemble of model states. Parameters’ values for the ensemble generation are first computed from the misfit between the data and the model results without assimilation. Then, two square root algorithms are applied to assimilate the data. The impact of data assimilation on the simulated temperature is assessed. Results show that the ensemble Kalman filter is adequate for improving temperature forecasts in coastal areas, under adequate model error specification.
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Bats in the Belgian part of the North Sea and possible impacts of offshore Wind Farms. in: Degraer, S. et al. (Ed.) (2016). Environmental impacts of offshore wind farms in the Belgian part of the North Sea: Environmental impact monitoring reloaded.
- Several species of bats in northern Europe undertake seasonal migrations between their summer roosts and wintering areas. Doing so, they are known to cross open sea in some cases. Taking account of the increase of wind farms in the Belgian part of the North Sea and the entire North Sea, the lack of information on the spatio-temporal distribution of bats in Belgian waters and the results of some studies (onshore) demonstrating wind turbines can cause high mortalities in bats, a taxon in global decline, it is important to quantify the risk of offshore wind farms in the North Sea to threaten bat populations. To investigate bat distribution, we installed an automated acoustic recorder on the Belgian research vessel ‘Belgica’ to record bats while the vessel is at sea at night. The acoustic detector on the Belgica was operational during 93 nights in autumn 2014 and spring 2015, hence covering two full bat migration periods. In autumn 2014, 117 call sequences were registered in the BPNS, belonging to four different species. In spring 2015, only four sequences were registered, all during one night. The few recordings were all registered during only three nights. These results are not sufficient to solidly determine spatio-temporal patterns of bats in the BPNS, but allow drawing some preliminary conclusions on their frequency of occurrence and distribution at sea. In 2015 and 2016, a network of nine Batcorders is collecting data in the Dutch and Belgian part of the North Sea and along the coastline. This detector network will increase our knowledge about the impact of offshore wind farms on bats as it will increase the number of detections of bats at sea and will allow direct comparison between data collected at the different locations, without seasonal or meteorological bias. This will allow addressing the question if bats are attracted to or avoid offshore wind farms. This may then lead to appropriate management or mitigation measures.
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Une Araignée nouvelle pour la faune de Belgique: Tetrilus arietimus (Thorell).
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Communication: Araignées nouvelles pour la faune de Belgique
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Meta merianae var. celata (Black.) nouvelle pour la faune de Belgique.
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Trois Araignées inéressantes pour al faune de Belgique.
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Notes sur les Araignées de la faune de Belgique. V. Thomisidae
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Communication
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Spinnen van Lagland
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Exposé présidentiel: Historique et évolution de l'arachnologie en Belgique
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Communicationh: Araneus incospicuus (Simon) araignée nouvelle pour la faune belge.
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Communication: Une araignée rare: pardosa bifasciata (L.K. Koch, 1834)
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Atypus affinis Eichwald ) la "Grande Bruyère" de Rixensart.
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Historique et évolution de l'Aranéologie en Belgique
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Araignées nouvelles pour la faune de Belgique
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Araignées du plateau des hautes fagnes, Ière partie: Historique et Faunistique
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Cataloque des araignées de Belgique. Deuxième partie: les cribellates
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Catalogue des araignées de Belgique. Troisième partie. Les Araneidae.
