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| Titel |
Modelling the effect of field management on crop water productivity and catchment hydrology |
| VerfasserIn |
Hanne Van Gaelen, Patrick Willems, Jan Diels, Dirk Raes |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250089859
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| Publikation (Nr.) |
 EGU/EGU2014-4072.pdf |
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| Zusammenfassung |
| Upgrading crop water productivity (WPET) is crucial to assure food production in a
future world, where simultaneously the world population grows and land and water
resources become increasingly limited. Adapted field management is one of the
key solutions to upgrade WPET for rainfed agriculture in drought prone regions.
However field management strategies should be assessed considering their impact
on a larger scale (catchment hydrology), and this for current and future climatic
conditions.
By linking a crop water productivity model (AquaCrop) to a lumped conceptual
hydrological model (VHM), we aimed to develop a general modeling procedure to
evaluate the impact of field management on WPET and catchment hydrology. To
avoid disadvantages related to other model approaches, we specifically aimed at a
procedure that (i) can be applied for both current and future climatic conditions, (ii) is
widely applicable and generally relevant, i.e. also for developing countries, and (iii)
requires a relatively small number of explicit parameters and mostly-intuitive input
variables.
The linkage between AquaCrop and VHM is tested for two catchments in Flanders with a
high proportion of agricultural land. After the VHM model is calibrated and AquaCrop
simulations are run for the different land units (crop-soil combinations) of the catchment, the
response behaviour of the VHM unsaturated zone model and the AquaCrop soil water
balance is compared. Differences are identified and interpreted and a final coupling of the two
models is established trough the water balance of the unsaturated zone. Thereby the overland
runoff and water percolation to the groundwater or subsurface flow are the most crucial
linkage components. After both models are linked different field management scenarios can
be investigated with respect to their effect on both WPET and catchment hydrology. |
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