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              <gmd:specification xlink:href="http://inspire.ec.europa.eu/id/citation/ir/reg-1089-2010">
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                    <gco:CharacterString>Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services</gco:CharacterString>
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                        <gco:Date>2010-11-23</gco:Date>
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                    <gco:CharacterString>INSPIRE Data Specification on Oceanographic geographical features – Technical Guidelines v3.0</gco:CharacterString>
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                        <gco:Date>2013-12-10</gco:Date>
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            <gco:CharacterString>Les capteurs utilisés pour suivre la turbidité près du fond sont : un turbidimètre optique NTUS (Wetlabs) et un courantomètre ponctuel Aquadopp 200 m (Nortek).
Le turbidimètre optique donne une information qualitative de la visibilité sous-marine. Il mesure l’absorbance et/ou la diffusion d’un rayon lumineux de longueur d’onde connue par un liquide. La lumière incidente ainsi réfléchie vers l’instrument est fonction de la quantité de particules en suspension dans l’eau. Les turbidimètres optiques donnent des valeurs en NTU (Nephelometric Turbidity Unit) permettant d’évaluer la capacité de l’eau à laisser passer la lumière (turbidité). Les turbidimètres ont été choisis pour mesurer à 650 nm c’est à dire dans le rouge. Ce critère est important à considérer car cela signifie qu’il sera bien plus sensible aux particules minérales qu’au phytoplancton.
Le courantomètre ponctuel (Aquadopp) donne des informations sur l’intensité et la direction des courants près du fond. Il peut également mesurer la température et la pression. Ce capteur, en plus de servir d’alimentation au turbidimètre, pourra apporter des éléments sur les conditions hydrodynamiques et affirmer ou infirmer l’impact des courants sur les variations de turbidité.
Après étalonnage en laboratoire, ces deux capteurs sont ensuite fixés sur des structures pouvant être de deux types selon la profondeur d’immersion :
- pour les petits fonds (St Brieuc, Morlaix, Fret, Douarnenez et Concarneau), des cages tripodes en aluminium (légère) accueillant les capteurs, un largueur Sonardyne LRT, des systèmes de lests et d’ancrage ainsi que des flotteurs ;
- pour les grands fonds (points Grande Vasière et Gino), des cages de type Antirion fixées sur un lest en béton et qui nécessitent un porteur pour leur déploiement.
Les capteurs (turbidimètre et courantomètre) sont positionnés pour mesurer à moins d’1 m du fond pour les turbidimètres et de 2 m pour les courantomètres.
Les instruments déployés acquièrent une mesure toutes les 20 min en continu. Cette fréquence d’acquisition nécessite une rotation des systèmes tous les trois mois pour garantir l’autonomie des batteries et ainsi la continuité des mesures.</gco:CharacterString>
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                <gmd:LocalisedCharacterString locale="#EN">The sensors used to monitor turbidity near the bottom are: NTUS Optical Turbidimeter (Wetlabs) and Aquadopp 200m Spot Current Meter (Nortek).
The optical turbidimeter gives a qualitative information of underwater visibility. It measures the absorbance and / or the diffusion of a light ray of known wavelength by a liquid. The incident light thus reflected towards the instrument is a function of the quantity of particles suspended in the water. Optical turbidimeters give values in NTU (Nephelometric Turbidity Unit) to assess the ability of water to let light (turbidity). The turbidimeters were chosen to measure at 650 nm, ie in the red. This criterion is important to consider because it means that it will be much more sensitive to mineral particles than to phytoplankton.
The punctual current meter (Aquadopp) gives information on the intensity and direction of currents near the bottom. It can also measure temperature and pressure. This sensor, in addition to serving as a turbidimeter feed, can provide elements on hydrodynamic conditions and affirm or deny the impact of currents on turbidity variations.
After calibration in the laboratory, these two sensors are then fixed on structures which can be of two types according to the depth of immersion:
- for shallow waters (St Brieuc, Morlaix, Freight, Douarnenez and Concarneau), tripod cages made of aluminum (light) welcoming the sensors, a Sonardyne LRT width, weighing and anchoring systems as well as floats;
- for large funds (Grande Vasière and Gino points), Antirion type cages fixed on a concrete ballast and which require a carrier for their deployment.
The sensors (turbidimeter and current meter) are positioned to measure less than 1 m from the bottom for turbidimeters and 2 m for current meters.
Deployed instruments acquire a measurement every 20 minutes continuously. This frequency of acquisition requires a rotation of the systems every three months to guarantee the autonomy of the batteries and thus the continuity of the measurements.</gmd:LocalisedCharacterString>
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