Page - 425 - in Book of Full Papers - Symposium Hydro Engineering

𝑆 𝑏 = 𝐵 𝐷 𝑈 √𝑔 𝐶 𝑒 [ −0.27Δ𝛾 𝑠 𝑑 𝛾 𝜏 𝑐 {1+0.5( 𝜉 𝑈 𝑏 𝑈 ) 2 } ] (7) G. Bagnold-Bailard Equation: Bagnold (1960, 1966) developed an approach to bed load transport prediction that is based on stream power per unit channel width Average velocity (U) can be given by 𝑈 =𝑢 𝑐 +𝑢 𝑡 (8) where uc = fluid velocity due to current effect (m/s) ut = Orbital fluid velocity above the bed at time t (m/s) assume uc = U, then bed load transport Sb is related to IUI2U 𝑆 𝑏 (𝑡 )= 𝜏 0 [1− 𝜌 𝑓 𝜌 𝑠 ] { 𝑒 𝑏 𝑡 𝑎 𝑛 𝛼 +𝑒 𝑠 (1−𝑒 𝑏 ) ?̅? 𝜔 0 } (9) the suspended load transport Ss is related to IUI3U and computed from 𝑆 𝑠 (𝑡 )= 𝜏 0𝑈 [1− 𝜌 𝑓 𝜌 𝑠 ] { 𝑒 𝑠 𝑡 𝑎 𝑛 𝛼 +𝑒 𝑠 (1−𝑒 𝑠 ) ?̅? 𝜔 0 } (10) The Bijiker model predicts too small concentration magnitudes and too large fluid velocities in the near bed zone. These results in current related sediment transport rates that are 4 times for small transports (<0.001Kg/ms) and 4 times large transports.The evaluation of sediment transport based on above methods except Bijker and Bagnold is given in table2. Table:1. Prediction of Sediment by Investigators S No. Investigators Predicted Sediment ton 1. Camenen and Larson Method 1194604.32 2. Engelund and Hansen Method 756025.46 3. Ackers and White’s Method 600278.89 4. Meyer-Peter and Muller Method 445292.83 425