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| Titel |
Groundwater-surface water interaction and the climatic spatial patterns of hillslope hydrological response |
| VerfasserIn |
C. P. Kim, G. D. Salvucci, D. Entekhabi |
| 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 ; 3, no. 3 ; Nr. 3, no. 3, S.375-384 |
| Datensatznummer |
250001088
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| Publikation (Nr.) |
 copernicus.org/hess-3-375-1999.pdf |
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| Zusammenfassung |
| A transient, mixed analytical-numerical model of hillslope hydrological
behaviour is used to study the patterns of infiltration, evapotranspiration,
recharge and lateral flow across hillslopes. Computational efficiency is
achieved by treating infiltration and phreatic surface movement analytically.
The influence of dynamic coupling of the saturated and unsaturated zones on the
division of hillslopes into units of distinct hydrological behaviour is
analyzed. The results indicate the importance of downhill groundwater flow on
the lateral distribution of soil moisture and hydrological fluxes; unsaturated
lateral flow is shown to be of relatively minor importance. For most conditions,
the hillslope organizes itself into three distinct regions; an uphill
recharge and a downhill discharge zone separated by a midline zone over which
there is, on average, no recharge or discharge. A temporal perturbation analysis
of the phreatic surface, made to quantify the deviations between the
equivalent-steady water table derived by Salvucci and Entekhabi (1995) and the
long-term mean water table, shows that the equivalent-steady water table
effectively couples the unsaturated and saturated zone dynamics across storm and
interstorm periods and divides the hillslope into distinct hydrological regions.
The second order closure terms in the perturbation analysis, expressed as the
gradient of water table variance, quantify the deviations and tend to make the
hydrological zones relatively less distinct. |
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