streamline section
1.the influence of ratio of bridge deck width to its height on three mean coefficients is showed too. The results show that:1) The mean drag and lift coefficient have considerable Reynolds number effect between the streamline-liked type and the Π-type bridge deck section;
2.Moreover,duck feather structure possess good streamline to reduce the resistance when duck swims because of the slant flange on the cross section and barb at the end of feather. These result in the different capability when they are in water.
