File:AccumulationMoussePollutionDeûleEcluseGrandCarréJuillet2019a 01.jpg
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![File:AccumulationMoussePollutionDeûleEcluseGrandCarréJuillet2019a 01.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/e/ec/AccumulationMoussePollutionDe%C3%BBleEcluseGrandCarr%C3%A9Juillet2019a_01.jpg/800px-AccumulationMoussePollutionDe%C3%BBleEcluseGrandCarr%C3%A9Juillet2019a_01.jpg?20220207151739)
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Captions
accumulation of foam on the canalized river Deûe (here : downstream of Lille) in the North of France
accumulation de mousse sur la rivière canalisée Deûle en aval de Lille dans le Nord de la France
Summary
[edit]DescriptionAccumulationMoussePollutionDeûleEcluseGrandCarréJuillet2019a 01.jpg |
Français : Détail de la surface d'une accumulation de mousse sur la rivière canalisée Deûle en aval de Lille dans le Nord de la France (ici juste en aval de l'écluse du Grand-carré, en sortie de Lille, à la hauteur de Saint-André). Cette mousse est un indice de pollution organique et/ou chimique ; elle peut faire évoquer la présence d'un détergent ou produit similaire dans l'eau (amonium quaternaire..).
Le phénomène se produit encore épisodiquement, parfois accompagné d'une odeur particulière.
Dans les années 1960, il était beaucoup plus fréquent et intense, et les couches de mousses pouvaient dépasser 1 voire 2 m d'épaisseur. A cette époque, il n'y avait pas de station d'épuration dans cette zone et la couche de mousse était beaucoup plus importante. English: Detail of the surface of an accumulation of foam on the canalized river Deûle downstream of Lille in the North of France (here just downstream of the lock of the Grand-carré, at the exit of Lille, near Saint-André). This foam is an index of organic and/or chemical pollution; it can evoke the presence of a detergent or similar product in the water (quaternary ammonia, etc.).
This phenomenon still occurs episodically, sometimes accompanied by a particular smell. In the 1960s, it was much more frequent and intense, and the layers of foam could exceed 1 or even 2 m in thickness. At that time, there was no sewage treatment plant in this area and the layer of foam was much greater. |
Date | |
Source | Own work |
Author | Lamiot |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 15:17, 7 February 2022 | ![]() | 4,608 × 3,456 (3.78 MB) | Lamiot (talk | contribs) | Uploaded own work with UploadWizard |
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Camera manufacturer | NIKON CORPORATION |
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Camera model | COOLPIX W300 |
Exposure time | 1/320 sec (0.003125) |
F-number | f/4.3 |
ISO speed rating | 125 |
Date and time of data generation | 17:26, 7 July 2019 |
Lens focal length | 9.2 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | COOLPIX W300 V1.0 |
File change date and time | 17:26, 7 July 2019 |
Y and C positioning | Centered |
Exposure Program | Normal program |
Exif version | 2.31 |
Date and time of digitizing | 17:26, 7 July 2019 |
Meaning of each component |
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Image compression mode | 2 |
APEX exposure bias | 0 |
Maximum land aperture | 3 APEX (f/2.83) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, auto mode |
Supported Flashpix version | 1 |
Color space | sRGB |
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 |
Digital zoom ratio | 0 |
Focal length in 35 mm film | 52 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Reference for direction of image | Magnetic direction |
GPS tag version | 0.0.3.2 |