fine grained sand behavior in a dam reservoir at the middle reaches of a river
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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

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

outline
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

coefficient of resistance to soil particles
(1)① Soil Particle SedimentationCoefficient of resistance to soil particles

Results from the experiment

Coefficient of resistance of sedimentation

Reynolds number

rubey s equation and presented equation
(1)① Soil Particle SedimentationRubey’s Equation and Presented Equation

Rubey’s equation

Proposed equation

Fall velocity of a soil particle [cm/s]

Soil particle diameter [cm]

volume of entrainment vs ss concentration
(1)① Soil Particle EntrainmentVolume 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]

proposed of the entrainment rate equation
(1)① Soil Particle EntrainmentProposed of the Entrainment Rate Equation

Proposed coefficient K=0.00027

Conventional coefficient K=0.008

calculation results of the reproduction
(3) To confirm the suitability of these equationCalculation 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

conclusion
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.
check dam
Check dam

W ater flow

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