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| Titel |
A steady-state saturation model to determine the subsurface travel time (STT) in complex hillslopes |
| VerfasserIn |
T. Sabzevari, A. Talebi, R. Ardakanian, A. Shamsai |
| 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 ; 14, no. 6 ; Nr. 14, no. 6 (2010-06-04), S.891-900 |
| Datensatznummer |
250012330
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| Publikation (Nr.) |
 copernicus.org/hess-14-891-2010.pdf |
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| Zusammenfassung |
| The travel time of subsurface flow in complex hillslopes (hillslopes with
different plan shape and profile curvature) is an important parameter in
predicting the subsurface flow in catchments. This time depends on the
hillslopes geometry (plan shape and profile curvature), soil properties and
climate conditions. The saturation capacity of hillslopes affect the travel
time of subsurface flow. The saturation capacity, and subsurface travel time
of compound hillslopes depend on parameters such as soil depth, porosity,
soil hydraulic conductivity, plan shape (convergent, parallel or divergent),
hillslope length, profile curvature (concave, straight or convex) and
recharge rate to the groundwater table. An equation for calculating
subsurface travel time for all complex hillslopes was presented. This
equation is a function of the saturation zone length (SZL) on the surface.
Saturation zone length of the complex hillslopes was calculated numerically
by using the hillslope-storage kinematic wave equation for subsurface flow,
so an analytical equation was presented for calculating the saturation zone
length of the straight hillslopes and all plan shapes geometries. Based on
our results, the convergent hillslopes become saturated very soon and they
showed longer SZL with shorter travel time compared to the parallel and
divergent ones. The subsurface average flow rate in convergent hillslopes is
much less than the divergent ones in the steady state conditions. Concerning
to subsurface travel time, convex hillslopes have more travel time in
comparison to straight and concave hillslopes. The convex hillslopes exhibit
more average flow rate than concave hillslopes and their saturation capacity
is very low. Finally, the effects of recharge rate variations, average
bedrock slope and soil depth on saturation zone extension were investigated. |
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