And base on the experiment, calculating formula of cross section mean velocity's reduction after planting and bed shears stress of vegetation dam block are established.
同时在试验的基础上，推导得植树后断面平均流速减小值和植物坝段床面剪应力的计算公式。
2
So how will they cross the dam?
船要如何通过水坝？
3
Steep and antithetic platy structure of rock mass and geomorphology of the longitudinal valley in the dam site area cause wide-range toppling deformation on the cross-strait slope.