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| Titel |
The WELSONS experiment: overview and presentation of first results on the surface atmospheric boundary-layer in semiarid Spain |
| VerfasserIn |
J.-P. Frangi, D. C. Richard |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 18, no. 3 ; Nr. 18, no. 3, S.365-384 |
| Datensatznummer |
250013938
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| Publikation (Nr.) |
 copernicus.org/angeo-18-365-2000.pdf |
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| Zusammenfassung |
This study presents the preliminary results
of the local energy budget and dynamic characteristics of the surface
atmospheric boundary-layer (SBL) during the WELSONS (wind erosion and losses of
soil nutrients in semiarid Spain) experiment. Some Mediterranean regions suffer
land degradation by wind erosion as a consequence of their particular soil and
climate conditions and inappropriate agricultural practice. In Spain, where land
degradation by water erosion is well known, the lack of field studies to
quantify soils losses by wind erosion resulted in the European Community
organizing a scientific program for this specific issue. The European programme
known as WELSONS was devoted to study the wind erosion process in central Aragon
(NE Spain). This multidisciplinary experiment, which began in 1996 and finished
in 1998, was carried out over an agricultural soil which was left fallow. Within
the experimental field, two plots were delimited where two tillage treatments
were applied, a mould-board ploughing (or conventional tillage denoted CT) and
chisel ploughing (reduced tillage denoted RT). This was to study on bare soil
the influence of tillage method on surface conditions, saltation flux, vertical
dust flux, erosion rates, dynamics characteristics such as friction velocity,
roughness length, etc., and energy budget. The partitioning of the available
energy, resulting from the dynamics of the SBL, are quite different over the two
plots because of their own peculiar soil and surface properties. The first
results show that the RT treatment seems to provide a wind erosion protection.
Because of the long data recording time and particular phenomena (formation of a
crust at the soil surface, very dry conditions, high wind speed for instance),
these microclimatological data acquired during the WELSONS programmes may be
helpful to test atmospheric boundary-layer models coupled with soil models.
Key words: Hydrology (desertification) - Meterology and
atmospheric dynamics (general) |
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