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| Titel |
Modularised process-based modelling of phosphorus loss at farm and catchment scale |
| VerfasserIn |
M. G. Hutchins, S. G. Anthony, R. A. Hodgkinson, P. J. A. Withers |
| 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. 6 ; Nr. 6, no. 6, S.1017-1030 |
| Datensatznummer |
250003859
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| Publikation (Nr.) |
 copernicus.org/hess-6-1017-2002.pdf |
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| Zusammenfassung |
| In recent years, a
co-ordinated programme of data collection has resulted in the collation of
sub-hourly time-series of hydrological, sediment and
phosphorus loss data, together with soil analysis, cropping and management
information for two small (< 200 ha) headwater agricultural catchments
in the UK Midlands (Rosemaund, Herefordshire and Cliftonthorpe, Leicestershire).
These data sets have allowed the dynamics of phosphorus
loss to be characterised and the importance of both storm runoff and drainflow
to be identified, together with incidental losses following
manure and fertiliser additions in contributing to total annual loss. A
modularised process-based model has been developed to represent
current understanding of the dynamics of phosphorus loss. Modules describing
runoff and sediment generation and associated phosphorus
adsorption/desorption dynamics are described and tested. In the model, the
effect of a growing crop on sediment detachment processes
is represented and the stability of topsoil is considered so that, overall, the
model is responsive to farm management factors. Importantly,
using data sets available from national-scale survey programmes to estimate
model parameters, a transferable approach is presented, requiring
only sub-hourly rainfall data and field-specific landcover information for
application of the model to new sites. Results from application
of the model to the hydrological year 1998–99 are presented. Assessment of
performance, which suggests that the timing of simulated
responses is acceptable, has focused attention on quantifying landscape and
in-stream retention and remobilisation processes.
Keywords: phosphorus, erosion, process-based modelling, agriculture |
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