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

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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


The saru river

・Introduction

The Saru River


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


Experimental setup

(1)① Soil Particle Sedimentation

Experimental setup


Influence of water tank

(1)① Soil Particle Sedimentation

Influence of Water Tank

S2

S2

S1


Coefficient of resistance to soil particles

(1)① Soil Particle Sedimentation

Coefficient of resistance to soil particles

Results from the experiment

Coefficient of resistance of sedimentation

Reynolds number


Proposed equations for falling velocity of soil particles

(1)① Soil Particle Sedimentation

Proposed equations for falling velocity of soil particles


Rubey s equation and presented equation

(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]


Experimental setup1

(1)① Soil Particle Entrainment

Experimental Setup


Experimental setup2

(1)① Soil Particle Entrainment

Experimental Setup


Volume of entrainment vs ss concentration

(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]


Proposed of the entrainment rate equation

(1)① Soil Particle Entrainment

Proposed 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 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


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


Cross section of the dam before after flood downstream of the check dam

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


Grain size of soil particles

Grain Size of Soil Particles


Parameters in the entrainment experiment

Parameters in the entrainment experiment


Discharge and water level calculated

Discharge and Water Level (Calculated)


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