Spectral analysis of turbulent flow and suspended sediment transport over fixed dunes

454 Pages·2000·13.7 MB·English

by  Venditti, Jeremy G

Historic, Archive Document
Do assume
not content reflects current
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—
aTC529 R47
USDA
United States Agricultural
Department of Research
Agriculture Service
&
Channel Watershed Processes Research Unit
National Sedimentation Laboratory
Oxford, Mississippi 38655
Spectral Analysis of Turbulent Flow and Suspended
Sediment Transport over Fixed Dunes
Two (2) Acoustic Doppler
Current Meters
ADV B ADV A
Two
(2) Optical
Backscatter Probes
Reynolds Stress -pu'w' (Pa)
a)
-
o
^ —
- 0r ' ct1
Os t <^Tox'
10 20 30 40 50 60 70 80
Jeremy G. Venditti and Sean J. Bennett
Research Report No. 11 June 2000
J
J
215
TABLE OF CONTENTS
ACKNOWLEDGEMENTS
iii
LIST OF TABLES iv
LIST OF FIGURES v
NOTATION
vii
ATTACHED FILES
viii
ABSTRACT
1
INTRODUCTION
1. 2
EXPERIMENTAL EQUIPMENT AND PROCEEDURE
2. 4
MEAN TURBULENT FLOW AND SUSPENDED SEDIMENT CONCENTRATION
3.
3.1 Mean flow field 10
3.2 Turbulent flow field 1
3.3 Suspended sediment concentration 15
SPECTRAL ANALYSIS
4.
4.1 Velocity time-series 17
4.2 Sedimentconcentration time-series 20
CO-SPECTRAL ANALYSIS
5.
5.2 Co-spectral analysis 22
6. INTEGRAL TIME AND LENTH SCALES 24
CONCLUSIONS
7. 26
REFERENCES
27
APPENDICES 30
Appendix A: Spatially Averaged Reynolds Stress 3
Appendix B: Velocity Moments and Turbulence Properties 33
Appendix C: Velocity Profiles 56
Appendix D: Concentration Data 64
Appendix E: Concentration Profiles 76
Appendix F: Flow and Concentration Maps 93
Appendix G: Time-Series used in Time-Series Analysis 98
Appendix H: Velocity and Concentration Spectra
1 1
Appendix I: Spectral Energy Peaks and Associated Frequencies 196
i

Appendix J: Autocorrelation Functions 198
Appendix K: Integral Tiimme Scale M< 214

ACKNOWLEDGEMENTS
We gratefully acknowledge the technical support ofJ. Tuttle, M. Nelson, J. Cox, and J. Milan. P.
ADV
Biron provided the algorithmto filter the velocity signals. Financial support during data
analysis was provided to J.V. through the Department ofGeography atthe University ofSouthern
California and a University Graduate Fellowship at the University ofBritish Columbia. B. Bauer
provided valued comments and suggestions during data analysis. The manuscripthas benefited
by the constructive reviews ofM. Church, R. Kuhnle, and M. Schmeekle.