File:AccumulationMoussePollutionDeûleEcluseGrandCarréJuillet2019a 01.jpg
From Wikimedia Commons, the free media repository
Jump to navigation
Jump to search
Size of this preview: 800 × 600 pixels. Other resolutions: 320 × 240 pixels | 640 × 480 pixels | 1,024 × 768 pixels | 1,280 × 960 pixels | 2,560 × 1,920 pixels | 4,608 × 3,456 pixels.
Original file (4,608 × 3,456 pixels, file size: 3.78 MB, MIME type: image/jpeg)
File information
Structured data
Captions
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 |
Licensing
[edit]I, the copyright holder of this work, hereby publish it under the following license:
This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 15:17, 7 February 2022 | 4,608 × 3,456 (3.78 MB) | Lamiot (talk | contribs) | Uploaded own work with UploadWizard |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
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.
Camera manufacturer | NIKON CORPORATION |
---|---|
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 |
|
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 |