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| Titel |
The contribution of soil structural degradation to catchment flooding: a preliminary investigation of the 2000 floods in England and Wales |
| VerfasserIn |
I. P. Holman, J. M. Hollis, M. E. Bramley, T. R. E. Thompson |
| 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 ; 7, no. 5 ; Nr. 7, no. 5, S.755-766 |
| Datensatznummer |
250004794
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| Publikation (Nr.) |
 copernicus.org/hess-7-755-2003.pdf |
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| Zusammenfassung |
| During the autumn of 2000, England and Wales experienced the wettest conditions
for over 270 years, causing significant flooding. The exceptional combination of a wet
spring and autumn provided the potential for soil structural degradation. Soils prone to
structural degradation under five common lowland cropping systems (autumn-sown crops,
late-harvested crops, field vegetables, orchards and sheep fattening and livestock rearing
systems) were examined within four catchments that experienced serious flooding. Soil
structural degradation of the soil surface, within the topsoil or at the topsoil/subsoil
junction, was widespread in all five cropping systems, under a wide range of soil types
and in all four catchments. Extrapolation to the catchment scale suggests that soil
structural degradation may have occurred on approximately 40% of the Severn, 30–35 % of
the Yorkshire Ouse and Uck catchments and 20% of the Bourne catchment. Soil structural
conditions were linked via hydrological soil group, soil condition and antecedent rainfall
conditions to SCS Curve Numbers to evaluate the volume of enhanced runoff in each
catchment. Such a response at the catchment-scale is only likely during years when
prolonged wet weather and the timing of cultivation practices lead to widespread soil
structural degradation. Nevertheless, an holistic catchment-wide approach to managing
the interactions between agricultural land use and hydrology, allowing appropriate
runoff (and consequent flooding) to be controlled at source, rather than within the
floodplain or the river channel, should be highlighted in catchment flood management
plans.
Keywords: flooding, soil structure, land management, Curve Number, runoff, agriculture |
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