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| Titel |
Integrated response and transit time distributions of watersheds by combining hydrograph separation and long-term transit time modeling |
| VerfasserIn |
M. C. Roa-García, M. Weiler |
| 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. 8 ; Nr. 14, no. 8 (2010-08-13), S.1537-1549 |
| Datensatznummer |
250012399
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| Publikation (Nr.) |
 copernicus.org/hess-14-1537-2010.pdf |
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| Zusammenfassung |
| We present a new modeling approach analyzing and predicting the Transit Time
Distribution (TTD) and the Response Time Distribution (RTD) from hourly to
annual time scales as two distinct hydrological processes. The model
integrates Isotope Hydrograph Separation (IHS) and the Instantaneous Unit
Hydrograph (IUH) approach as a tool to provide a more realistic description
of transit and response time of water in catchments. Individual event
simulations and parameterizations were combined with long-term baseflow
simulation and parameterizations; this provides a comprehensive picture of
the catchment response for a long time span for the hydraulic and isotopic
processes. The proposed method was tested in three Andean headwater
catchments to compare the effects of land use on hydrological response and
solute transport. Results show that the characteristics of events and
antecedent conditions have a significant influence on TTD and RTD, but in
general the RTD of the grassland dominated catchment is concentrated in the
shorter time spans and has a higher cumulative TTD, while the forest
dominated catchment has a relatively higher response distribution and lower
cumulative TTD. The catchment where wetlands concentrate shows a flashier
response, but wetlands also appear to prolong transit time. |
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