Page - 541 - in Book of Full Papers - Symposium Hydro Engineering

Scaling Factors Applied to Physical Model Construction Parameter Length(m) Time(s) Velocity(m/s) Discharge(㎥/s) Scale factors 1 : 45 1 : 6.71 (1:451/2) 1 : 6.71 (1:451/2) 1 : 13,584 (1:455/2) The suspended sediments are too fine at the model scale of 45 to be reproduced correctly in the model as the scaled down grain diameter would be affected by cohesion. Therefore, the fine sediments are represented by artificial sediment, distorted in density and size having appropriate critical shear velocity according to the Shields curve and appropriate fall velocity. In general, Ground walnut shells are a common material for suspension modeling as they are cohesion-less, easy to mix, produce a homogeneous distribution and have a specific weight smaller than sand (Kantoush 2008, Jenzer 2011). So for the suspended load tests, ground walnut shells were used. The condition of the physical model applied is as follows. Fig 7. Bird’s-eye View of the Physical Model 3.4.3. Investigation Result First of all, the flow condition, the water level and the flow velocities in the MP are described for the variant load case. During normal power operation(hereafter called NPO), design discharge Q=156㎥/s, the water surface 541