 |
| Titel |
How is initial soil erosion affected by rainfall intensity and kinetic
energy? |
| VerfasserIn |
Martin Neumann, Thomas Iserloh, Jesús Rodrígo Comino, Petr Kavka, Manuel Seeger, Johannes B. Ries |
| Konferenz |
EGU General Assembly 2017
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250137455
|
| Publikation (Nr.) |
 EGU/EGU2017-172.pdf |
|
|
|
|
|
| Zusammenfassung |
| Rainfall simulation with small scale simulators is a method used worldwide to assess the
generation of overland flow and initial soil erosion. For a thorough interpretation of the
obtained experimental data, it is necessary to know detailed information of the rainfall
characteristics. This study presents the effect of different rainfall intensities and kinetic
energies on initial soil erosion rates under controlled experimental conditions. For this
research the small portable rainfall simulator of Trier University was used. The experimental
plot is 0.28 m2 and the height of the nozzle is 2 m above ground. We applied a wide range of
rainfall intensities (20, 40, 60 and 80 mm h−1) and kinetic energies (0.4 – 9 J m2 mm−1). For
this purpose, a set of various nozzles were tested under laboratory conditions. First, the
spatial distribution of the artificial rainfall on the plot surface was measured to ensure the
reproducibility of the experiments with constant rainfall intensity. Second, the drop size
distribution was tested to control and adjust its similarity to the one measured in natural
events.
With the selected nozzles and rainfall intensities, 54 rainfall simulations were performed
on prepared surface at the experimental site of Trier University. With the measured values a
3D matrix of rainfall intensity, kinetic energy and soil loss were calculated. This method
allows an accurate estimation of soil erodibility for a wide range of rainfall characteristics.
The presentation was funded by Ministry of agriculture of the Czech Republic (research
project QJ1520265). |
|
|
|
|
|
|