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| Titel |
Trends of streamflow, sediment load and their dynamic relation for the catchments in the middle reaches of the Yellow River over the past five decades |
| VerfasserIn |
Z. L. Gao, Y. L. Fu, Y. H. Li, J. X. Liu, N. Chen, X. P. Zhang |
| 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 ; 16, no. 9 ; Nr. 16, no. 9 (2012-09-10), S.3219-3231 |
| Datensatznummer |
250013464
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| Publikation (Nr.) |
 copernicus.org/hess-16-3219-2012.pdf |
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| Zusammenfassung |
To control severe soil erosion on the Loess Plateau, China, a great number
of soil conservation measures have been implemented since 1950s and
subsequently, the "Grain for Green" project was implemented in
1999. The measures and the project resulted in a large scale land use/cover
change (LUCC). Understanding the impacts of the measures and the project on
streamflow, sediment load and their dynamic relation is essential because the
three elements are closely related to the sustainable catchment management
strategy on the Loess Plateau. The data for seven selected catchments in the
middle reaches of the Yellow River were used and standardized with the
precipitation and the controlling area for analysis. The nonparametric
Mann-Kendall test and the Pettitt test were employed to detect trends and change
points of the annual streamflow and annual sediment load. Simple linear
regressions for the monthly streamflow and sediment load from May to October
were made to express their relationship. Based on the change point
identification and the time when the project began to be implemented on the Loess
Plateau, the complete time for the data records was divided into three periods
to compare the change degrees of streamflow, sediment load and their
relation for the catchments.
Results show that there are three types of responses in streamflow, sediment
load, and their dynamic relations for the seven catchments. The effects of
the LUCC on streamflow, sediment load, and their relationships are greatest
in the three transition zone catchments followed by the two rocky mountain
catchments. The effects are much weaker in the two loess
hilly-gully catchments. In general, the change degrees for sediment load are
much greater than those for streamflow, which results from the decreased
streamflow and weakening trend of their dynamic relation period by period in
catchments. |
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