Study on the velocity distributions for ice-covered flow

The presence of an ice-cover in a river will signif icantly change flow structure.The vertical two dimensional numerical model for ice-covered flow is developed by the k-ε turbulence model.Based upon the theory of dimensional analysis the factors influencing the velocity distribution patterns are proposed.The numerical experiments for various combinations of factors are conducted,and the flow characteristics such as location of the maximum velocity,mean velocities of obth ice-affected region and bed-diffected region are analyzed.The accuracy of two-point depth averaged flow measurement for ice-covered river is investigated The results reveal that the sectional velocity distribution deviates from the logarithmic law in the core flow area Meanwhile,the influence of roughness ratio of ice-cover bottom to bed,bed relative roughness and Reynold number on velocity distribution pattern is indicated.