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| Titel |
Extension of the Representative Elementary Watershed approach for cold regions: constitutive relationships and an application |
| VerfasserIn |
L. Mou, F. Tian, H. Hu, M. Sivapalan  |
| 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 ; 12, no. 2 ; Nr. 12, no. 2 (2008-03-17), S.565-585 |
| Datensatznummer |
250010577
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| Publikation (Nr.) |
 copernicus.org/hess-12-565-2008.pdf |
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| Zusammenfassung |
| The Representative Elementary Watershed (REW) approach proposed by Reggiani
et al. (1998, 1999) represents an attempt to develop a scale
adaptable modeling framework for the hydrological research community. Tian
et al. (2006) extended the original REW theory for cold regions
through explicit treatment of energy balance equations to incorporate
associated cold regions processes, such as snow and glacier
melting/accumulation, and soil freezing/thawing. However, constitutive
relationships for the cold regions processes needed to complete these new
balance equations have been left unspecified in this derivation. In this
paper we propose a set of closure schemes for cold regions processes within
the extended framework. An energy balance method is proposed to close the
balance equations of melting/accumulation processes as well as the
widely-used and conceptual degree-day method, whereas the closure schemes for
soil freezing and thawing are based on the maximum unfrozen-water content
model. The proposed closure schemes are coupled to the previously derived
balance equations and implemented within the Thermodynamic Watershed
Hydrological Model (THModel, Tian, 2006) and then applied to the headwaters
of the Urumqi River in Western China. The results of the 5-year calibration
and 3-year validation analyses show that THModel can indeed simulate runoff
processes in this glacier and snow-dominated catchment reasonably well, which
shows the prospects of the REW approach and the developed closure schemes for
cold regions processes. |
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