LIST OF FIGURES 



No. Page 



1 The H-S sampler 11 



2 The streamer trap 11 



3 Streamer nozzle 15 



4 Method of closing streamer 15 



5 Typical arrangement for field experiment 17 



6 Variables used in transport calculations 19 



7 Tank used for hydraulic and sand- trapping tests 22 



8 Location of nozzle during testing 22 



9 Locations of testing and control sections for hydraulic test ... 23 



10 Photograph of point gage and flow meter setup 25 



11 Flow speed at test section B 25 



12 Variation of flow speed with depth at test section B . 26 



13 Nozzle parameters varied in hydraulic test 27 



14 Vertical distributions of flow speed 29 



15 Typical flow speed profiles 32 



16 Example nozzle cross section 32 



17 Flow visualization around nozzles using string 38 



18 Midflow hydraulic efficiency 39 



19 Bottom flow hydraulic efficiency 39 



20 Hydraulic efficiency with midflow speed 40 



21 Test section used in sand- trapping tests 45 



22 Bed configuration and sand movement as a function of midflow 



speed , Reynolds number , and Shields number 46 



23 Relationship between shear flow and midflow speed 49 



24 Percent of total sand collected in second and third basins .... 55 



25 Basin flux for 7.5-min test 60 



26 Basin flux for 2.5-min test 60 



27 Flux measured with DUCK85 nozzle 61 



28 Flux measured with SUPERDUCK nozzle 61 



29 Flux measured with C nozzle 62 



30 Summary of power threshold fits 62 



31 Grain size distributions 67 



32 Basin flux for 2.5-min run with "new sand" 67 



33 Basin flux for 7.5-min run with "new sand" 68 



34 Flux measured with C nozzle 68 



35 Modified basin flux for 5-min test and power threshold fit 



nozzle fluxes 71 



36 Sketch for discussing the hypothetical disequilibrium of sand 



flux due to length of test section 74 



37 Area beneath each nozzle rate prediction used to calculate 



sand -trapping efficiency 76 



38 Example SSM data set 81 



39 Example TSM data set 81 



40 Consistency test arrangement 82 



41 Run 2-1, DUCK85 consistency test (9-4-85) 83 



42 Run 2-2, DUCK85 consistency test (9-4-85) 83 



43 Run 1, DUCK85 consistency (9-7-85) 84 



44 Run 4, DUCK85 consistency test (9-7-85) 84 



45 Run 5, DUCK85 consistency test (9-9-85) 85 



