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| Titel |
Experimental study of the propagation of granulometric patches in rivers |
| VerfasserIn |
Morgane Houssais, Eric Lajeunesse |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250080415
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| Zusammenfassung |
| River beds usually exhibit granulometric patches. Previous studies focused on the patches
characterization (size, spatial organization, grain sizes distribution) and the links between
these characteristics and the sediment transport rate in rivers. However, few studies
have attempted to quantify the time evolution of patches as a results of flow and
granulometric conditions. Here we report an experimental investigation focusing on
the propagation of patches. The experiments are performed in a flume of length
240 cm and width W = 9.6 cm. The flume is initially filled with a sediment bed
separated in two parts : an upstream part made of large grains (diameter=2.2mm) and a
downstream part made of small grains (diameter=0.7mm). Using image analysis, we
document the propagation of the boundary of the large grains at rest on the bed. |
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