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| Titel |
Sediment Transport and Channel Morphology of the Kosi River, North Bihar Plain (India) |
| VerfasserIn |
Kumar Gaurav, Hugo Chauvet, François Métivier, Olivier Devauchelle, Rajiv Sinha |
| 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 |
250075893
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| Zusammenfassung |
| The Kosi River of the northern Bihar plain, India and Nepal, is well-known for the frequent
lateral shift of its course. In the last two centuries, it migrated more than 150 km westward
(Gole and Chitale, 1966; Wells and Dorr, 1987; Sinha.R, 2008). This westward shift produced
a megafan of an area about 16,000 Km2. Today the river shows a braided networks of streams
of various magnitude. The large dimension of the Kosi river, its sandy bed, and its avulsive
nature makes it an ideal field site to understand sediment transport in large braided
rivers.
We report measurements of discharge, velocity, width and depth across channels of the
Kosi river within its embankment. ADCP measurements were performed during the high flow
period in late July to early August 2012. First-hand analysis of the ADCP data shows
order-of-magnitude variations of channel aspect ratio, discharge and velocity. We use these
measurements to evaluate wether individual threads are close to the threshold for the
sediment movement, and to evaluate the relationship between channel shape and discharge.
This represents a first step towards the establishment of sediment budgets in a large sandy
braided river. |
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