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

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Experimentelle Rinnenerosionsforschung vs. Modellkonzepte – Quantifizierung der hydraulischen und erosiven Wirksamkeit von Rinnen Table 3 Average values of all factors for all experiments. Shear stress 1 includes the sediment concentration and grain density in the liquid density calculation, shear stress 2 is calculated using a constant liquid density of 1 g cm -3 . c = value is calculated, equation number is given, m = value is measured. SSC = Sediment concentration. The r-l-factor describes the relationship between runoff and flow length: inflow/runoff * length. Factor Unit m/c 1a 1b 2a 2b 3a 3b 4a 4b Transport rate [kg s -1 ] c 4 0.0055 0.0057 0.0112 0.0152 0.0006 0.0004 0.0015 0.0013 SSC [g L -1 ] m 16.32 13.53 44.02 37.51 2.56 1.78 10.19 9.41 Detachment rate [kg s -1 m -2 ] c 3 0.0051 0.0054 0.0123 0.0146 0.0007 0.0006 0.0033 0.0037 Shear stress 1 [Pa] c 7 7.17 7.15 5.88 6.24 3.64 4.75 2.77 3.5 Shear stress 2 [Pa] c 7 7.09 7.09 5.73 6.12 3.64 4.75 2.76 3.49 Hydraulic Radius [cm] m 1.28 1.28 1.16 1.19 0.90 1.13 0.74 0.87 Slope [°] m 3.2 3.2 2.9 2.9 2.4 2.4 2.1 2.1 Flow velocity [m s -1 ] m 0.15 0.18 0.16 0.21 0.14 0.17 0.16 0.19 Liquid density [g cm -3 ] m 1.010 1.008 1.027 1.023 1.002 1.001 1.006 1.006 r-l-factor [m] m 1.27 4.25 6.39 7.95 3.09 4.29 ND 3.34 Runoff coefficient [%] m 12.68 42.47 45.61 56.78 51.56 71.54 ND 51.33 RE1 showed the highest average values in both shear stress forms (constant liquid density and liquid density including sediment concentration and grain density), in the hydraulic radius values and in slope. Lowest values were measured for r-l-factor and runoff coefficient (1a). In RE2 the highest values for transport rate (2b), sediment concentration (2a), detachment rate (2b), flow velocity (2b), liquid density (2a) and r-l-factor (2b) were measured. RE 3 only showed the highest runoff coefficient (3b). Instead of highest values, many lowest values have been measured or calculated: transport rate, sediment concentration, detachment and liquid density in 3b and flow velocity in 3a. RE4 provided the lowest shear stress values, the lowest hydraulic radius (4a) and the lowest slope. In a model simulation, in most cases average values are used. The external parameters are constant on the whole field (see Table 2), so the 4 different rills would be described by one mean value. We calculated mean values of all samples (4 experiments x 2 runs x 3 MPs x 4 samples = 96 samples) which are presented in Table 4. To compare the variability of the different parameters, we also calculated the relative measurement error (RME) and the empirical variation coefficient (EVC) for each of them. The RME values for the tested parameters are presented in Fig. 8, the EVC values in Fig. 9 and they are summarized in Table 4. 149
Experimentelle Rinnenerosionsforschung vs. Modellkonzepte – Quantifizierung der hydraulischen und erosiven Wirksamkeit von Rinnen Fig. 8 The relative measurement errors of the tested parameters: Shear stress 1 includes the sediment concentration and grain density in the liquid density calculation, shear stress 2 is calculated using a constant liquid density of 1 g cm –3 Fig.9 The empirical variation coefficient of the tested parameters: Shear stress 1 includes the sediment concentration and grain density in the liquid density calculation, shear stress 2 is calculated using a constant liquid density of 1 g cm –3 150
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Stefan Wirtz Vom Fachbereich VI (Ge
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Danksagung Danksagung Die vorliegen
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Inhaltsverzeichnis Inhaltsverzeichn
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Inhaltsverzeichnis Abbildungsverzei
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Experimentelle Rinnenerosionsforsch
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Dipl. Geogr. Stefan Wirtz; Physisch
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Stefan Wirtz Vom Fachbereich VI (Geographie/Geowissenschaften ...

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