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ESTIMATION OF HYDRAULIC PARAMETERS OF ARMORED LAYER FORMING IN MOUNTAIN RIVERS AND STREAMS

ESTIMATION OF HYDRAULIC PARAMETERS OF ARMORED LAYER FORMING IN MOUNTAIN RIVERS AND STREAMS. Wojciech Bartnik, Andrzej Strużyński. Krakow Agriculture University. PLAN. Introduction Bed load Characteristics of bed load Field and laboratory measurements

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ESTIMATION OF HYDRAULIC PARAMETERS OF ARMORED LAYER FORMING IN MOUNTAIN RIVERS AND STREAMS

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  1. ESTIMATION OF HYDRAULIC PARAMETERS OF ARMORED LAYER FORMINGIN MOUNTAIN RIVERS AND STREAMS Wojciech Bartnik, Andrzej Strużyński Krakow Agriculture University

  2. PLAN • Introduction • Bed load • Characteristics of bed load • Field and laboratory measurements • Velocity profile during change of bed parameters • Conclusions

  3. INTRODUCTION Hydraulic parameters of armored layer forming can be described on basis of stochastic nature of bed load movement proposed by Gessler. The purpose of laboratory experiment was to describe the change of velocity profile and basic hydraulic parameters during armoring process.

  4. Stochastic nature of grain movement – turbulence ... BED LOAD

  5. Stochastic nature of grain movement – loops, sweeps ... BED LOAD

  6. Gessler’s function BED LOAD

  7. Shields curve, Wang’s equation, Bartnik’s modification BED LOAD

  8. Tenczyński Stream FIELD MEASUREMENTS

  9. Tenczyński Stream FIELD MEASUREMENTS

  10. Tenczyński Stream FIELD MEASUREMENTS

  11. Tenczyński Stream FIELD MEASUREMENTS

  12. Krzczonowski Stream – upper part FIELD MEASUREMENTS

  13. Krzczonowski Stream FIELD MEASUREMENTS

  14. Krzczonowski Stream FIELD MEASUREMENTS

  15. LABORATORY MEASUREMENTS • Flume dimensions: l2.0 x 0.5 x 0.6 m (glass walls) • Flume rig: • micro-propeller • flow-meter • slope measurements • Bed slope, water surface slope • Discharge: max 0.13 qm s-1 • Trap for bed load • Artificial grains Ø – 4 to 8 cm

  16. artificial and natural grains LABORATORY MEASUREMENTS

  17. artificial and natural grains LABORATORY MEASUREMENTS

  18. artificial and natural grains BED ROUGHNESS Profile-meter AG-1

  19. comparing roughness with K BED ROUGHNESS

  20. observation of critical stresses BED ROUGHNESS

  21. bed load transport influences roughness (K) VELOCITY PROFILE DURINGCHANGE OF BED PARAMETERS

  22. VELOCITY PROFILE DURINGCHANGE OF BED PARAMETERS U/Umax = A log (y/Y) + B A = 39.3 K + 0.24 A = 6.38 (Y/K)-0.835 B becomes constant- B = 1.12±3%

  23. VELOCITY PROFILE DURINGCHANGE OF BED PARAMETERS U/Umax = A log (y/Y) + B

  24. CONCLUSIONS The interaction between bed load and flowing water creates the actual flow parameters. Bed roughness acts on flowing water more significantly after armouring process. Small fractions hidden and packed in bigger ones make bed roughness smaller. During flood after uncovering armour coat mass transport appear due to even higher bed velocity. Scouring process grows stronger then before. After flood accumulation zones appear and river flow direction changes due to flow concentration.

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