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Index of Tables
Index of Tables
1. Introduction 1
2. State of the art 5
3. Theoretical considerations 21
Table 3.1: Correction factors for the determination of the friction angle 25
Table 3.2: Measured friction angle for the used sediment 26
Table 3.3: Computation of the friction factor solving simultaneously for all hydraulic radii (Tests
without macro-roughness) 32
Table 3.4: Comparison of sediment transport equations 39
Table 3.5: Comparison of characteristics of discussed scour formulae 57
Table 3.6: Characteristics of the laboratory tests of the present study and Peter’s (1986) data 59
Table 3.7: Correction factors for scour formulae and correlations with lab experiments 64
4. Experimental setup and test procedure 67
Table 4.1: Heights of the step (above channel bottom) at the inlet and outlet for the different tests
80
Table 4.2: Characteristics of the used sediments 82
5. Test results 99
Table 5.1: Computed sediment transport capacity (without armoring) - overview over the test domain
100
Table 5.2: Computed sediment transport capacity (with armoring) - overview over the test domain
101
Table 5.3: Overview of the performed tests and measurements 101
Table 5.4: Overview of the preliminary tests without macro-roughness 102
Table 5.5: Velocities in m/s measured during the preliminary test without macro-roughness 105
Table 5.6: Overview of the preliminary tests with macro-roughness (spacing 2°) 106
Table 5.7: Spacing of the macro-roughness 111
6. Analysis of the test results 113
Table 6.1: Overview of the topics of chapter 6 and Appendixes 114
Table 6.2: Overview of the observed scour positions 119
Table 6.3: Overview of the observed point bar positions 121
Table 6.4: Formula for the determination of the grain size in the scour holes and on the point bars
135
Table 6.5: dm and d90 for the sediment samples of the armoring layer after the tests and at the
outlet 136
Table 6.6: Mean velocity profiles and standard deviation in tangential direction (along the channel
axis) 139
7. Establishing an empirical formula 149
Table 7.1: List of parameters used in existing scour formulae 151
Table 7.2: Table of correlations R2 for the tests without macro-roughness 152
EPFL Ph.D thesis 2632 - Daniel S. Hersberger November 9, 2002 / page 223