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| Titel |
Watershed discretization based on multiple factors and its application in the Chinese Loess Plateau |
| VerfasserIn |
Y. D. Xu, B. J. Fu, C. S. He, G. Y. Gao |
| 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. 1 ; Nr. 16, no. 1 (2012-01-09), S.59-68 |
| Datensatznummer |
250013112
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| Publikation (Nr.) |
 copernicus.org/hess-16-59-2012.pdf |
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| Zusammenfassung |
| The spatial discretization of watersheds is an indispensable procedure for
representing landscape variations in eco-hydrological research, representing
the contrast between reality and data-supported models. When discretizing a
watershed, it is important to construct a scheme of a moderate number of
discretized factors while adequately considering the actual eco-hydrological
processes, especially in regions with unique eco-hydrological features and
intense human activities. Because of their special lithological and
pedologic characteristics and widespread man-made vegetation, discretization
of watersheds in the Loess Plateau in Northern China is a challenge. In
order to simulate the rainfall-runoff process, a watershed in the Loess
Plateau, referred as Ansai, was spatially discretized into new units called
land type units. These land type units were delineated under a scheme of
factors including land use, vegetation condition, soil type and slope.
Instead of using units delineated by overlaying land use and soil maps, the
land type units were used in the Soil and Water Assessment Tool (SWAT).
Curve numbers were assigned and adjusted to simulate runoff, using the US
Natural Resources Conservation Service (NRCS) curve number method. The
results of the runoff simulation better matched actual observations.
Compared to the results that used the original units, the coefficient of
determination (R2) and the Nash-Sutcliffe coefficient (ENS) for
monthly flow simulation increased from 0.655–0.713 and 0.271–0.550 to
0.733–0.745 and 0.649–0.703, respectively. This method of delineating into
land type units is an easy operation and suitable approach for
eco-hydrological studies in the Chinese Loess Plateau and other similar
regions. It can be further applied in soil erosion simulation and the
eco-hydrological assessment of re-vegetation. |
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