File:La-Plaine-sur-Mer (Loire-Atlantique) (26508000215).jpg
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[edit]DescriptionLa-Plaine-sur-Mer (Loire-Atlantique) (26508000215).jpg |
La-Plaine-sur-Mer (Loire-Atlantique)
Pêcheries. De nombreuses pêcheries se sont développées le long du littoral du pays de Retz. Principalement dans les communes de Pornic, Les Moutiers-en-Retz, La-Bernerie-en-Retz, Préfailles, La-Plaine-sur-Mer. Ces pêcheries permettent la pratique de la pêche au carrelet, filet carré monté sur une armature, que l'on déscend horizontalement. On peut fixer un appât au centre du carrelet. La capture du poisson se fait en remontant le filet. Le ponton et la cabane étant sur le domaine public maritime, sont soumis à une concession renouvelable tous les 5 ans. De nombreuses pêcheries ont été détruites lors des tempêtes de 1999 et 2010. Il s'agit surtout d'une pêche de loisir, et dans certains cas d'une activité touristique.
On remarque un échouage massif d'algues vertes sur la côte. En l'absence de ramassage rapide, les échouages d'algues en putréfaction génèrent de fortes pollutions olfactives par le dégagement d'hydrogène sulfuré (H2S). L’odeur d’oeuf pourri est caractéristique de H2S. Ce gaz étant toxique, voir mortel (mort très rapide pour une concentration supérieure à 1000 ppm, toxique dès 50 ppm), il est conseillé de s'éloigner dès perception visuelle d'algues vertes, d'autant qu’à forte teneur le nerf olfactif est paralysé (anesthésie de l’odorat au-dessus de 100 ppm) : la détection par l’odorat n’est donc pas un critère de sécurité. Ces proliférations d'algues vertes sont déclenchées par un apport excessif de nitrates dans la mer. Ces nitrates viennent de l'agriculture et de l'élevage et sont transportés à la mer par les rivières. Les algues vertes se forment en mer, et sont ensuite rejetées sur la plage par les courants. |
Date | Taken on 24 March 2016, 13:09 |
Source | La-Plaine-sur-Mer (Loire-Atlantique) |
Author | Daniel Jolivet |
Camera location | 47° 09′ 27.12″ N, 2° 12′ 06.23″ W ![]() | View this and other nearby images on: OpenStreetMap | ![]() |
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Licensing
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This image was originally posted to Flickr by sybarite48 at https://flickr.com/photos/26082117@N07/26508000215 (archive). It was reviewed on 28 November 2017 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
28 November 2017
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current | 15:47, 28 November 2017 | ![]() | 4,928 × 3,264 (9.06 MB) | Thesupermat2 (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Image title |
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Camera manufacturer | PENTAX |
Camera model | PENTAX K-5 II |
Author | JOLIVET Daniel |
Copyright holder |
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Exposure time | 1/200 sec (0.005) |
F-number | f/9 |
ISO speed rating | 100 |
Date and time of data generation | 13:09, 24 March 2016 |
Lens focal length | 32.5 mm |
Latitude | 47° 9′ 27.12″ N |
Longitude | 2° 12′ 6.23″ W |
Altitude | 4.7 meters above sea level |
Short title |
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Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop Elements 9.0 Windows |
File change date and time | 19:00, 18 April 2016 |
Y and C positioning | Co-sited |
Exposure Program | Shutter priority |
Exif version | 2.3 |
Date and time of digitizing | 13:09, 24 March 2016 |
Meaning of each component |
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APEX exposure bias | 0 |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Focal length in 35 mm film | 49 mm |
Scene capture type | Standard |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Distant view |
GPS time (atomic clock) | 12:09 |
Satellites used for measurement | 10 |
Receiver status | Measurement in progress |
Measurement mode | 3-dimensional measurement |
Speed unit | Kilometers per hour |
Speed of GPS receiver | 0.03 |
Reference for direction of movement | True direction |
Direction of movement | 204 |
Reference for direction of image | True direction |
Direction of image | 239.32 |
Geodetic survey data used | WGS-84 |
GPS date | 24 March 2016 |
GPS tag version | 2.3.0.0 |
Supported Flashpix version | 1 |
Image width | 4,928 px |
Image height | 3,264 px |
Date metadata was last modified | 21:00, 18 April 2016 |
Unique ID of original document | xmp.did:2E8A21008705E6118A8DE3C25E686797 |
Keywords |
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IIM version | 32,164 |