In a small watershed of mountainous areas, it is difficult to calibrate roughness of slope surface, gully and stream due to laking measured data of natural flow movement.

• 摘要在山区小流域中，坡面流糙率、沟道和山溪等的糙率由于缺乏天然水流实测资料，无法进行糙率率定，使得山洪爆发后，坡面流、沟道和山溪水流计算难以符合实际。