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| Titel |
Impact of climate change and anthropogenic activities on stream flow and sediment discharge in the Wei River basin, China |
| VerfasserIn |
P. Gao, V. Geissen, C. J. Ritsema, X.-M. Mu, F. Wang |
| 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 ; 17, no. 3 ; Nr. 17, no. 3 (2013-03-05), S.961-972 |
| Datensatznummer |
250018816
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| Publikation (Nr.) |
 copernicus.org/hess-17-961-2013.pdf |
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| Zusammenfassung |
| Reduced stream flow and increased sediment discharge are a major concern in
the Yellow River basin of China, which supplies water for agriculture,
industry and the growing populations located along the river. Similar
concerns exist in the Wei River basin, which is the largest tributary of the
Yellow River basin and comprises the highly eroded Loess Plateau. Better
understanding of the drivers of stream flow and sediment discharge dynamics
in the Wei River basin is needed for development of effective management
strategies for the region and entire Yellow River basin. In this regard we
analysed long-term trends for water and sediment discharge during the flood
season in the Wei River basin, China. Stream flow and sediment discharge
data for 1932 to 2008 from existing hydrological stations located in two
subcatchments and at two points in the Wei River were analysed.
Precipitation and air temperature data were analysed from corresponding
meteorological stations. We identified change-points or transition years for
the trends by the Pettitt method and, using double mass curves, we diagnosed
whether they were caused by precipitation changes, human intervention, or
both. We found significant decreasing trends for stream flow and sediment
discharge during the flood season in both subcatchments and in the Wei
River itself. Change-point analyses further revealed that transition years
existed and that rapid decline in stream flow began in 1968 (P < 0.01),
and that sediment discharge began in 1981 (P < 0.01) in the
main river. In the two subcatchments, the transition years were 1985
(P < 0.01) and 1994 (P < 0.05) for water discharge, and 1978
and 1979 for sediment discharge (P < 0.05), respectively. The impact
of precipitation or human activity on the reduction amount after the
transition years was estimated by double mass curves of precipitation
vs. stream flow (sediment). For reductions in stream flow and sediment
discharge, the contribution rate of human activity was found to be 82.80
and 95.56%, respectively, and was significantly stronger than the
contribution rate of precipitation. This evidence clearly suggests that, in
the absence of significant decreases in precipitation, strategies for
managing the region need to focus on human activities to control erosion
without restricting stream flow. |
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