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| Titel |
Rapid channel incision of the lower Pearl River (China) since the 1990s as a consequence of sediment depletion |
| VerfasserIn |
X. X. Lu, S. R. Zhang, S. P. Xie, P. K. Ma |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 11, no. 6 ; Nr. 11, no. 6 (2007-12-17), S.1897-1906 |
| Datensatznummer |
250009551
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| Publikation (Nr.) |
 copernicus.org/hess-11-1897-2007.pdf |
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| Zusammenfassung |
| This paper reported a dramatic channel incision (>10 m in the deepest cut)
during the past 10 y or so in the lower Pearl River, the second largest
river in terms of water discharge in China. The channel incision had caused
changes both in the channel geometry as well as in the river hydraulics.
Also, the water exchange between the two major tributaries of the Pearl
River, the Xijiang and Beijiang, had been significantly changed due to the
channel incision. The rapid channel incision was principally the result of
extensive sand mining in the lower Pearl River and the delta region due to
the booming economy in the Pearl Delta region. Slight increase of water
discharge and significant decrease of sediment load since the early 1990s in
both the Xijiang and Beijiang also likely contributed to the observed
dramatic river bed downcutting to some extent. This has important
implications for river management, as the large Chinese rivers have seen a
dramatic depletion of sediment fluxes due to the combined effects of
declining rainfall, dam constructions, water diversion, reforestation and
afforestation, and sediment mining over the recent decades. |
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