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

Experimentelle Rinnenerosionsforschung vs. Modellkonzepte – Quantifizierung der hydraulischen und erosiven Wirksamkeit von Rinnen
In experiment 5, the detachment rate [Kg s -1 m -2 ] and the transport rate [Kg s -1 ] are
presented. They are calculated as follows:
transport rate = sediment concentration * flow velocity * flow cross section
detachment rate = transport rate / (flow length * wetted perimeter)
The sediment concentration is given in [g L -1 ], flow velocity in [m s -1 ], the flow cross section
in [m 2 ], flow length and wetted perimeter in [m].
3 Results and interpretation
3.1 Translocation quantities in downslope direction
Figure 3: Translocation quantities in down-slope direction
The first runs are not taken into account in order to eliminate possible errors due to the
installation of the Gerlach troughs.
On the 8.5° slope plot, rock fragments are translocated only in the 4 th run, in all other runs
only fine material is affected by the trampling. The quantities are similar, they range between
75 and 41 g, only run 4 with 282 g and run 8 with only 4 g are out of line. The quantities are
presented in figure 3a. In total, 83 g rock fragments (11 %) and 662 g fine material was
translocated (figure 3d). The translocation flux is equal to translocation quantity.
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