CONTENTS 



Page 

 LITERATURE CITED 83 



APPENDIX 



A DATA FROM 104 EXPERIMENTS ON RIPPLE GROWTH AND 



EQUILIBRIUM FORMS ..... 86 



B PHOTOS OF INITIAL AND FINAL BED FORMS FOR THE 24 



EXPERIMENTS STARTING FROM AN INITIALLY LEVELED BED. . . 92 



TABLES 



1 Symbols used to indicate combinations of D and N 34 



2 Symbols showing degrees of two- and three-dimensionality. ... 66 



FIGURES 



1 Definition sketches for ripple dimensions 13 



2 Trends of i^^ as function of a/D, from various observers .... 16 



3 Design curves for equilibrium bed-form wavelength 19 



4 Design curves for equilibrium bed-form height 21 



5 A/D as function of 2a/D, from various observers 25 



6 Longitudinal section through spool and the adjacent end of 



the test section 29 



7 Grain-size distributions for the three sands 31 



8 Photos of grains of the three sands 32 



9 Distribution of N and T for experiments 1 to 57 with the 



0.55-millimeter sand 35 



10 Distribution of N and T for experiments 58 to 84 with the 



0.18-millimeter sand 36 



11 Distribution of N and T for experiments 85 to 104 with the 



0.21-millimeter sand 37 



12 Observed (j)^ as a function of a/D and r (or D) 41 



5 



