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

Experimentelle Rinnenerosionsforschung vs. Modellkonzepte – Quantifizierung der hydraulischen und erosiven Wirksamkeit von Rinnen
Table 3: Hydraulic parameters, ND = no data, F = waterfront, T1 = tracer 1, T2 = tracer 2
Negratin Freila Salada Belerda
run a b a b a b a b
VR [L] 26 44 47 ND 19 55 43 59
Qm [L s -1 ] 0.08 0.11 0.13 ND 0.07 0.13 0.15 0.14
Qf 0.53 0.73 0.87 ND 0.47 0.87 1 0.93
RC [-] 0.36 0.61 0.65 ND 0.27 0.76 0.6 0.82
RCL [m] 7.22 12.22 13.71 ND 3.96 11.46 9.56 13.11
tS [s] 166 108 175 ND 155 70 118 110
tE [s] 866 666 663 ND 593 726 646 794
TR [s] 700 558 88 ND 438 656 528 684
va [m s -1 ]
vmax [m s -1 ]
dT 1.46 1.16 1.02 ND 0.92 1.37 1.15 1.43
F 0.16 0.21 0.12 0.27 0.12 0.25 ND 0.15
T1 0.36 0.3 0.29 0.28 0.29 0.31 0.26 0.25
T2 0.32 0.31 0.35 0.34 0.38 0.39 0.29 0.24
F 0.36 0.44 0.18 0.70 0.22 0.49 ND 0.29
T1 1.05 0.78 0.42 0.37 0.44 0.46 0.49 0.5
T2 0.93 0.85 0.65 0.56 0.6 0.61 0.44 0.38
Erosion dynamics
The erosion dynamic parameters are all summarized in table 4.
Negratin: The average sediment concentration in the first run (run a) was 270 g L -1 with an
average maximum flow velocity of 0.28 m s -1 . The maximum sediment concentration of 428
g L -1 was measured after 30 sec at MP3. In the second run (run b), the average sediment
concentration reached only 58 g L -1 , with an average maximum flow velocity of 0.27 m s -1 .
The maximum sediment concentration increased to only 111 g L -1 and was measured at the
waterfront at MP3 (figure 3).
Freila: In the 1 st run, the average sediment concentration reached 224 g L -1 with an average
maximum flow velocity of 0.25 m s -1 . In the second run 189 g L -1 and 0.3 m s -1 were
reached. The maximum sediment concentration in the first run increased to 438 g L -1 ,
measured at MP3 after 2:30 min. In run b, a maximum value of 267 g L -1 was measured at
MP2 after 2:30 min (figure 4).
Salada: The average sediment concentration in the 1 st run reached 183 g L -1 and increased to
295 g L -1 in the 2 nd run. The average maximum flow velocities were 0.27 and 0.32 m s -1 . The
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