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Chapter 4 - Experimental setup and test procedure 7 1000 450 312 .5 200 160 640 100 1150 1200 1000 0.072 m 3 1 0.121 m 3 1 0.291 m 3 1 180 0.011 m 3 2 50 3 4 5 6 364 Total 0.496 m 3 8 8 6 1. Sediment reservoir, 2. Rotating cylinder (with a slide opening), 3. Fuse to prevent rotating cylinder from damage, 4. Mechanic step-down gear, 5. Motor, 6. Electronic Frequency Modulator, 7. Gate to adjust the opening with thick plastic lip, 8. Conveyor belt Figure 4.6: Scheme of the used sediment supply The sediment reservoir (1) had a storage volume of 0.50 m 3 . On its bottom, a rotating cylinder with a slice opening (2) continuously pushed the sediments through a thick plastic lip to drop on the conveyor belt (8). It was no problem to obtain high sediment rates. In order to get also low transport rates, several speed reducing devices were mounted to the motor (5): a mechanic stepdown gear (4) reduced the rotation rate by a factor 20 and an electronic frequency modulator (6) allowed to reduce the initial rotation rate of the motor considerably. The axis was protected by a mechanic fuse (3) from damage. A gate with a thick plastic lip (7) allowed the control of the opening of the sediment supply (adjustment to the grain size and of the sediment supply rate). The precision of the time-averaged sediment supply rate is estimated to be at about 10 to 15%. page 72 / November 9, 2002 Wall roughness effects on flow and scouring
Description of the experimental setup 1 7 3 4 5 2 7 6 LEFT: general view, RIGHT TOP: view from inside the reservoir CENTER BOTTOM: view from below the machine, CENTER RIGHT: electronic frequency modulator Figure 4.7: Sediment supply machine (explanations see Fig. 4.6) EPFL Ph.D thesis 2632 - Daniel S. Hersberger November 9, 2002 / page 73
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WALL ROUGHNESS EFFECTS ON FLOW AND
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Abstract By applying vertical ribs
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Résumé En disposant des nervures
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Zusammenfassung • Ein markanter S
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Acknowledgments page x / November 9
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Table of contents 4. Smart & Jäggi
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Table of contents 7.6 Summary and c
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Chapter 1 - Introduction 1.1 Contex
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Chapter 1 - Introduction page 4 / N
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Chapter 2 - State of the art 2.1 Fl
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Chapter 2 - State of the art 2.2.2
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Chapter 2 - State of the art Theref
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Chapter 2 - State of the art resolu
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Chapter 2 - State of the art comple
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Chapter 2 - State of the art ORLAND
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Chapter 2 - State of the art 2.6 Me
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Chapter 2 - State of the art page 2
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Chapter 8 - Summary, conclusions an
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Notations K S [m 1/3 /s] roughness
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Notations bed b bf c cr d e g w o o
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References de Vriend H.J. (1981). S
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References Meyer-Peter, E., Favre,
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References Williams, R. (1899). Flu
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References by chapter Keulegan (193
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References by chapter page 214 / No
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Index of Authors Hoffmanns 13 Hoffm
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Index of Authors page 218 / Novembe
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Index of Figures Fig.4.19: Frame po
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Index of Figures 22] 183 Fig.7.15:
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Index of Tables Table 7.3: Table of
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Index of Keywords dimensional analy
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Index of Keywords sediment sampling
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Index of Keywords parameter 77 Pete
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Publications (continued) 1997 Hersb
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