File:AccumulationMoussePollutionDeûleEcluseGrandCarréJuillet2019.webm
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Original file (WebM audio/video file, VP8/Vorbis, length 29 s, 1,920 × 1,080 pixels, 2.83 Mbps overall, file size: 9.77 MB)
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Français : vidéo montrant, vue de dessus, une épaisse couche de mousse flottant juste en aval de l'écluse du Grand-Carré près de Lille sur la rivière canalisée Deûle 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. La. couleur est habituellement blanche, mais en juillet l'eau est plus chaude est ici très riche en plancton et sédiment en suspension. 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 Lille/Saint-André). This foam means organic and/or chemical pollution; it can evoke the presence of a detergent or similar product in the water (quaternary ammonia, etc.).
The 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 | |
|---|---|---|---|---|---|
| current | 16:28, 7 February 2022 | 29 s, 1,920 × 1,080 (9.77 MB) | Lamiot (talk | contribs) | Uploaded own work with UploadWizard |
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