天然砂砾料是山区河道中丰富的自然资源，也是压实后稳定性良好的路基填筑材料。
Natural gravel is rich natural resources and also better stable compacting roadbed material in the river courses of mountain areas.
乌江属典型的山区峡谷弯曲型河道。
山区型河道因河势变化急剧而产生的局部阻力对水流流态影响较大。
For a mountainous river, because of the great variation of river morphology along flow route, the local energy loss has a great impact on hydrodynamics.
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