Stefan Wirtz Vom Fachbereich VI (Geographie/Geowissenschaften ...

Experimentelle Rinnenerosionsforschung vs. Modellkonzepte – Quantifizierung der hydraulischen und erosiven Wirksamkeit von Rinnen
Table 2: Sediment concentrations and runoff coefficients of the rill experiments
Experiment rill sediment runoff
concentration [g L -1 ] coefficient [%]
RE1_2008a
2.10 11.27
1
RE1_2008b 0.82 37.75
RE2_2008a
4.48 45.61
2
RE2_2008b 1.23 56.78
RE3_2008a
3.91 51.56
3
RE3_2008b 1.36 71.54
RE4_2009a
6.30 94.00
1
RE4_2009b 5.00 94.00
RE5_2009a
19.90 97.00
4
RE5_2009b 5.10 97.00
RE6_2009a
6.00 96.00
5
RE6_2009b 6.10 96.00
RE7_2009a
15.50 94.00
1
RE7_2009b 5.00 94.00
3.2 Rainfall Simulations
In this study, the results of 33 rainfall experiments were used; the plots of all simulations are
shown in figure 3. In most cases, the rock fragments were embedded into the soil surface and
the bare soil areas were crusted. Only in some special cases, e.g. after a mechanical
disturbance (goat trampling) and the resulting destruction of the crusts, the rock fragments
were overlying. Most test plots showed a sparse vegetation cover and showed either a crusted
soil surface or a cover with embedded rock fragments. Rainfall experiment 23 showed a dense
vegetation cover, plots with mechanical treatment are 5-7 and 12-15. The influence of these
parameters on runoff and erosion are discussed in Ries et al. [27] and Ries & Marzolff [33]
for example. The percentages of the different surface parameters and the slope values of the
different plots are summarised in table 3.
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