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Chapter 6 - Analysis of the test results
6.1 Introduction
In this section the main tests will be analyzed. The observations and discussions are presented in
the following order:
• First the final scour is analyzed (§ 6.2). The bed topography (§ 6.2.1) including the scour
depth, the location of the point bars and scour holes, their volumes, the shape of the scour
hole and finally the geometrical aspect of the scour hole and of the cross-sections are discussed.
• Then observations regarding the free water surface are presented (§ 6.2.2).
• The next section (§ 6.3) deals with the evolution and formation of the scour.
• Sediment transport related phenomena are documented in section 6.4.
• Afterwards the grain sorting due to a wide grain size distribution and the formation of an
armoring layer is presented (§ 6.5).
• Finally the flow field and the velocity distributions are analyzed (§ 6.6).
All the results are summarized and discussed in the last section (§ 6.7).
The following table gives a summary of where the different topics can be found in the report and
in the Appendixes.
TOPIC REPORT APPENDIXES
Bed topography § 6.2.1 A.4, A.7, A.8
Water surface § 6.2.2 A.5, A.6, A.7, A.8
Scour process § 6.3 A.4, A.7, A.8
Bed load transport § 6.4 -
Grain sorting § 6.5 A.9, A.10
Velocities § 6.6 A.11
Macro-roughness in all sections A.4, A.5, A.6, A.7, A.8, A.9, A.10, A.11
Summaries, tables § 6.7 A.1
Table 6.1:
Overview of the topics of chapter 6 and Appendixes
page 114 / November 9, 2002
Wall roughness effects on flow and scouring