Simplicity versus complexity in modelling groundwater recharge in Chalk catchments
| Autor: | F. Bouraoui, R. B. Bradford, S. M. Crooks, R. Ragab, E. Peters |
|---|---|
| Přispěvatelé: | Centre for Ecology and Hydrology (CEH), Natural Environment Research Council (NERC), JRC Institute for Environment and Sustainability (IES), European Commission - Joint Research Centre [Ispra] (JRC), Wageningen University and Research [Wageningen] (WUR), EGU, Publication |
| Jazyk: | angličtina |
| Rok vydání: | 2002 |
| Předmět: |
010504 meteorology & atmospheric sciences
Headwater catchment 0207 environmental engineering [SDU.STU]Sciences of the Universe [physics]/Earth Sciences 02 engineering and technology Hydrology and Quantitative Water Management 01 natural sciences Catchment scale Modelling Groundwater recharge Streamflow 020701 environmental engineering [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Chalk 0105 earth and related environmental sciences Hydrology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere WIMEK Land use [SDU.OCEAN] Sciences of the Universe [physics]/Ocean Atmosphere 15. Life on land 6. Clean water [SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces environment Infiltration (hydrology) 13. Climate action [SDU.STU] Sciences of the Universe [physics]/Earth Sciences Environmental science Hydrologie en Kwantitatief Waterbeheer |
| Zdroj: | Hydrology and Earth System Sciences, 6(5), 927-937 Hydrology and Earth System Sciences Discussions Hydrology and Earth System Sciences Discussions, European Geosciences Union, 2002, 6 (5), pp.927-937 Hydrology and Earth System Sciences 6 (2002) 5 |
| ISSN: | 1027-5606 1607-7938 1812-2108 1812-2116 |
| Popis: | International audience; 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 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|