 |
| Titel |
Spatial and temporal variability of rainfall erosivity factor for Switzerland |
| VerfasserIn |
K. Meusburger, A. Steel, P. Panagos, L. Montanarella, C. Alewell |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 1 ; Nr. 16, no. 1 (2012-01-16), S.167-177 |
| Datensatznummer |
250013120
|
| Publikation (Nr.) |
 copernicus.org/hess-16-167-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| Rainfall erosivity, considering rainfall amount and intensity, is an
important parameter for soil erosion risk assessment under future land use
and climate change. Despite its importance, rainfall erosivity is usually
implemented in models with a low spatial and temporal resolution. The purpose
of this study is to assess the temporal- and spatial distribution of rainfall
erosivity in form of the (Revised) Universal Soil Loss Equation R-factor for
Switzerland. Time series of 22 yr for rainfall (10 min resolution) and
temperature (1 h resolution) data were analysed for 71 automatic gauging
stations distributed throughout Switzerland. Regression-kriging was used to
interpolate the rainfall erosivity values of single stations and to generate a map for
Switzerland. Latitude, longitude, average annual precipitation, biogeographic
units (Jura, Midland, etc.), aspect and elevation were used as covariates, of
which average annual precipitation, elevation and the biographic unit
(Western Central Alps) were significant (p<0.01) predictors. The mean value of
long-term rainfall erosivity is 1330 MJ mm ha−1 h−1 yr−1 with a range of
lowest values of 124 MJ mm ha−1 h−1 yr−1 at an elevated station in Grisons to
highest values of 5611 MJ mm ha−1 h−1 yr−1 in Ticino. All stations have
highest erosivity values from July to August and lowest values in the winter
months. Swiss-wide the month May to October show significantly increasing
trends of rainfall erosivity for the observed period (p<0.005). Only in February a significantly decreasing
trend of rainfall erosivity is found (p<0.01). The increasing trends of
rainfall erosivity in May, September and October when vegetation cover is scarce are
likely to enhance soil erosion risk for certain agricultural crops and alpine
grasslands in Switzerland. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|