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| Titel |
Distributed modeling of landsurface water and energy budgets in the inland Heihe river basin of China |
| VerfasserIn |
Y. Jia, X. Ding, C. Qin, H. 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 ; 13, no. 10 ; Nr. 13, no. 10 (2009-10-13), S.1849-1866 |
| Datensatznummer |
250012022
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| Publikation (Nr.) |
 copernicus.org/hess-13-1849-2009.pdf |
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| Zusammenfassung |
| A distributed model for simulating the land surface hydrological processes in
the Heihe river basin was developed and validated on the basis of considering
the physical mechanism of hydrological cycle and the artificial system of
water utilization in the basin. Modeling approach of every component process
was introduced from 2 aspects, i.e., water cycle and energy cycle. The
hydrological processes include evapotranspiration, infiltration, runoff,
groundwater flow, interaction between groundwater and river water, overland
flow, river flow and artificial cycle processes of water utilization. A
simulation of 21 years from 1982 to 2002 was carried out after obtaining
various input data and model parameters. The model was validated for both the
simulation of monthly discharge process and that of daily discharge process.
Water budgets and spatial and temporal variations of hydrological cycle
components as well as energy cycle components in the upper and middle reach
Heihe basin (36 728 km2) were studied by using the distributed
hydrological model. In addition, the model was further used to predict the
water budgets under the future land surface change scenarios in the basin.
The modeling results show: (1) in the upper reach watershed, the annual
average evapotranspiration and runoff account for 63% and 37% of the
annual precipitation, respectively, the snow melting runoff accounts for
19% of the total runoff and 41% of the direct runoff, and the
groundwater storage has no obvious change; (2) in the middle reach basin, the
annual average evapotranspiration is 52 mm more than the local annual
precipitation, and the groundwater storage is of an obvious declining trend
because of irrigation water consumption; (3) for the scenario of conservation
forest construction in the upper reach basin, although the evapotranspiration
from interception may increase, the soil evaporation may reduce at the same
time, therefore the total evapotranspiration may not increase obviously; the
measure of changing the farmland to pasture land in the middle reach basin
has obvious effects on decreasing evapotranspiration, increasing the
discharge at Zhengyixia, and decreasing the storage deficit; reducing the
irrigation surface water use in the middle reach basin has obvious functions
on increasing the discharge to downstream but the groundwater exploitation
increasing should be restricted to prevent the groundwater table decline. |
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