File:Encroutement localisé sur le fond de l'Authie amont barrage B2 9 aout 2017a3.jpg

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Français : Vue subaquatique d'un phénomène de phénomène de biominéralisation (Encroutements bactériens localisés) ici observés dans l'Authie près du pont qui précède le barrage B2 le 09 aout 2017 à faible profondeur (par rapport au "niveau d'étiage" estival). De petites touffes d'algues vertes sont visibles sur l'image.Localement le fond est colmaté (alors non propice à la ponte des salmonidés et de plusieurs autres espèces). Quelques éponges sont visibles à proximité.
English: 546/5000 Phenomenon of biomineralization (localized bacterial encounters) here observed in Authie near the bridge that precedes dam B2 on 09 August 2017 at shallow depth (relative to summer "low water level"). Small clumps of green algae are visible on the image. Locally the bottom is clogged (then not suitable for spawning salmonids and several other species). A few sponges are visible nearby and some gammares, theodoxus and larvae with scabbards, but in small number compared to what used to be.
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Author Lamiot
Camera location50° 20′ 42.21″ N, 1° 50′ 03.54″ E  Heading=332.52° Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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current08:41, 19 August 2017Thumbnail for version as of 08:41, 19 August 20174,077 × 2,798 (2.6 MB)Lamiot (talk | contribs)User created page with UploadWizard

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