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Fine-grained Sand Behavior in a Dam Reservoir at the Middle Reaches of a River

Fine-grained Sand Behavior in a Dam Reservoir at the Middle Reaches of a River. Civil Engineering Research Institute of Hokkaido 〇 Tomonori Shimada Yasuharu Watanabe Hiroyasu Yasuda. ・ Introduction. The Saru River. Outline. （１） Experiment on soil particle sedimentation

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Fine-grained Sand Behavior in a Dam Reservoir at the Middle Reaches of a River

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  1. Fine-grained Sand Behaviorin a Dam Reservoir at the Middle Reaches of a River Civil Engineering Research Institute of Hokkaido 〇 Tomonori Shimada Yasuharu Watanabe Hiroyasu Yasuda

  2. ・Introduction The Saru River

  3. Outline （１）Experiment on soil particle sedimentation Experiment on soil particle entrainment （２）To produce proposed equation （３） To confirm the suitability of these equation →Reproduction calculation for the flood

  4. （１）① Soil Particle Sedimentation Experimental setup

  5. （１）① Soil Particle Sedimentation Influence of Water Tank S2 S2 S1

  6. （１）① Soil Particle Sedimentation Coefficient of resistance to soil particles Results from the experiment Coefficient of resistance of sedimentation Reynolds number

  7. （１）① Soil Particle Sedimentation Proposed equations for falling velocity of soil particles

  8. （１）① Soil Particle Sedimentation Rubey’s Equation and Presented Equation Rubey’s equation Proposed equation Fall velocity of a soil particle [cm/s] Soil particle diameter [cm]

  9. （１）① Soil Particle Entrainment Experimental Setup

  10. （１）① Soil Particle Entrainment Experimental Setup

  11. （１）① Soil Particle Entrainment Volume of Entrainment vs. SS Concentration Concentration of suspended sediment in the water [mg/L] Volume of Entrainment SS Concentration Volume of Entrainment [cm3] Time of water flow [min]

  12. （１）① Soil Particle Entrainment Proposed of the Entrainment Rate Equation Proposed coefficient K=0.00027 Conventional coefficient K=0.008

  13. （3） To confirm the suitability of these equation Calculation Results of the Reproduction Before flood Surveyed Proposed equation Conventional equation Bed elevation [m] Volume of sediment [thousand m3] Reservoir bed Surveyed Proposed Conventional Equation Equation

  14. Conclusion • I explained fine grained sand behavior in a Dam reservoir. • First, I explained the experiment on soil particle sedimentation, and then the experiment on soil particle entrainment. • Next, I explained the method used to produce proposed equations. • Finally, in order to confirm the suitability of these equations, I showed the results of a reproduction calculation. • In conclusion, it is found that estimating the volume of sedimentation in the dam reservoir is possible through use of the equation.

  15. Check dam W ater flow

  16. Cross Section of the Dam Before/After Flood (Downstream of the Check Dam)

  17. Grain Size of Soil Particles

  18. Parameters in the entrainment experiment

  19. Discharge and Water Level (Calculated)

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