Localisation, nature et dynamique de l'interface eau-sédiment en réseau d'assainissement unitaire

Abstract : Erosion of sewer sediments and especially erosion of an organic deposit situated at the water-sediment interface are the major sources of pollution for combined sewer overflows. In order to ameliorate knowledge about the water-sediment interface, two devices were developed.
- an endoscope permitted to identify and localise two different types of organic interface (an immobile layer in Paris and Marseille, and moving near bed solids in Dundee and Hildesheim)
- a box, embedded in a sewer-wall in Paris, permitted to observe the interface and to show that the organic layer is an heterogeneous material with biological activity in it. This layer builds up rapidly to a stable depth during dry weather but it is disturbed by local changes. During flow increases, the organic layer is partly eroded and it is transported in bed-load and in suspension.
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Submitted on : Monday, April 5, 2004 - 5:57:18 PM
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  • HAL Id : tel-00005725, version 1

Citation

Claire Oms. Localisation, nature et dynamique de l'interface eau-sédiment en réseau d'assainissement unitaire. Autre. Ecole des Ponts ParisTech, 2003. Français. ⟨tel-00005725⟩

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