 |
| Titel |
Baseflow simulation using SWAT model in an inland river basin in Tianshan Mountains, Northwest China |
| VerfasserIn |
Y. Luo, J. Arnold, P. Allen, X. Chen |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 4 ; Nr. 16, no. 4 (2012-04-27), S.1259-1267 |
| Datensatznummer |
250013263
|
| Publikation (Nr.) |
 copernicus.org/hess-16-1259-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| Baseflow is an important component in hydrological modeling. The complex
streamflow recession process complicates the baseflow simulation. In order to
simulate the snow and/or glacier melt dominated streamflow receding quickly
during the high-flow period but very slowly during the low-flow period in rivers
in arid and cold northwest China, the current one-reservoir baseflow approach
in SWAT (Soil Water Assessment Tool) model was extended by adding a slow-
reacting reservoir and applying it to the Manas River basin in the Tianshan
Mountains. Meanwhile, a digital filter program was employed to separate
baseflow from streamflow records for comparisons. Results indicated that the
two-reservoir method yielded much better results than the one-reservoir one
in reproducing streamflow processes, and the low-flow estimation was improved
markedly. Nash-Sutcliff efficiency values at the calibration and validation
stages are 0.68 and 0.62 for the one-reservoir case, and 0.76 and 0.69 for
the two-reservoir case. The filter-based method estimated the
baseflow index as 0.60, while the model-based as 0.45. The filter-based
baseflow responded almost immediately to surface runoff occurrence at onset of
rising limb, while the model-based responded with a delay. In consideration of
watershed surface storage retention and soil freezing/thawing effects on
infiltration and recharge during initial snowmelt season, a delay response is
considered to be more reasonable. However, a more detailed description of
freezing/thawing processes should be included in soil modules so as to
determine recharge to aquifer during these processes, and thus an accurate
onset point of rising limb of the simulated baseflow. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|