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| Titel |
Selective deposition response to aeolian–fluvial sediment supply in the desert braided channel of the upper Yellow River, China |
| VerfasserIn |
H. Wang, X. Jia, Y. Li, W. Peng |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 15, no. 9 ; Nr. 15, no. 9 (2015-09-02), S.1955-1962 |
| Datensatznummer |
250119674
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| Publikation (Nr.) |
 copernicus.org/nhess-15-1955-2015.pdf |
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| Zusammenfassung |
| Rivers flow across aeolian dunes and develop braided stream channels. Both
aeolian and fluvial sediment supplies regulate sediment transport and
deposition in such cross-dune braided rivers. Here we show a significant
selective deposition in response to both aeolian and fluvial sediment
supplies in the Ulan Buh desert braided channel. The Ulan Buh desert is the
main coarse sediment source for this desert braided channel, and the mean
percentage of the coarser (> 0.08 mm) grains on the aeolian dunes
surface is 95.34 %. The lateral selective deposition process is developed by
the interaction between the flows and the aeolian–fluvial sediment supplies,
causing the coarser sediments (> 0.08 mm) from aeolian sand supply
and bank erosion to accumulate in the channel centre and the finer fluvial
sediments (< 0.08 mm) to be deposited on the bar and floodplain
surfaces, forming a coarser-grained thalweg bed bounded by finer-grained
floodplain surfaces. This lateral selective deposition reduces the
downstream sediment transport and is a primary reason for the formation of an
"above-ground" river in the braided reach of the upper Yellow River in
response to aeolian and fluvial sediment supplies. |
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