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| Titel |
Simplicity versus complexity in modelling groundwater recharge in Chalk catchments |
| VerfasserIn |
R. B. Bradford, R. Ragab, S. M. Crooks, F. Bouraoui, E. Peters |
| 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 ; 6, no. 5 ; Nr. 6, no. 5, S.927-937 |
| Datensatznummer |
250003775
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| Publikation (Nr.) |
 copernicus.org/hess-6-927-2002.pdf |
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| Zusammenfassung |
| Models of varying complexity are available to
provide estimates of recharge in headwater Chalk catchments. Some measure of how
estimates vary between different models can help guide the choice of model for a
particular application. This paper compares recharge estimates derived from four
models employing input data at varying spatial resolutions for a Chalk headwater
catchment (River Pang, UK) over a four-year period (1992-1995) that includes a
range of climatic conditions. One model was validated against river flow data to
provide a measure of their relative performance. Each model gave similar total
recharge for the crucial winter recharge period when evaporation is low.
However, the simple models produced relatively lower estimates of the summer and
early autumn recharge due to the way in which processes governing recharge
especially evaporation and infiltration are represented. The relative uniformity
of land use, soil types and rainfall across headwater, drift-free Chalk
catchments suggests that complex, distributed models offer limited benefits for
recharge estimates at the catchment scale compared to simple models.
Nonetheless, distributed models would be justified for studies where the pattern
and amount of recharge need to be known in greater detail and to provide more
reliable estimates of recharge during years with low rainfall.
Keywords: Chalk, modelling, groundwater recharge |
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