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| Titel |
Integrated hydrological modeling of the North China Plain and implications for sustainable water management |
| VerfasserIn |
H. Qin, G. Cao, M. Kristensen, J. C. Refsgaard, M. O. Rasmussen, X. He, J. Liu, Y. Shu, C. Zheng |
| 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. 10 ; Nr. 17, no. 10 (2013-10-02), S.3759-3778 |
| Datensatznummer |
250085944
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| Publikation (Nr.) |
 copernicus.org/hess-17-3759-2013.pdf |
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| Zusammenfassung |
| Groundwater overdraft has caused fast water level decline in the North China
Plain (NCP) since the 1980s. Although many hydrological models have been
developed for the NCP in the past few decades, most of them deal only with
the groundwater component or only at local scales. In the present study, a
coupled surface water–groundwater model using the MIKE SHE code has been
developed for the entire alluvial plain of the NCP. All the major processes
in the land phase of the hydrological cycle are considered in the integrated
modeling approach. The most important parameters of the model are first
identified by a sensitivity analysis process and then calibrated for the
period 2000–2005. The calibrated model is validated for the period
2006–2008 against daily observations of groundwater heads. The simulation
results compare well with the observations where acceptable values of root
mean square error (RMSE) (most values lie below 4 m) and correlation
coefficient (R) (0.36–0.97) are obtained. The simulated evapotranspiration
(ET) is then compared with the remote sensing (RS)-based ET data to further
validate the model simulation. The comparison result with a R2 value of
0.93 between the monthly averaged values of simulated actual
evapotranspiration (AET) and RS AET for the entire NCP shows a good
performance of the model. The water balance results indicate that more than
70% of water leaving the flow system is attributed to the ET component,
of which about 0.25% is taken from the saturated zone (SZ); about
29% comes from pumping, including irrigation pumping and non-irrigation
pumping (net pumping). Sustainable water management analysis of the NCP is
conducted using the simulation results obtained from the integrated model. An
effective approach to improve water use efficiency in the NCP is by reducing
the actual ET, e.g. by introducing water-saving technologies and changes in
cropping. |
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