Abstract: Bed roughness is the important parameter of debris flow velocity. Because the theoretic calculation is very complex, so the experimental method is used often, Sometimes the method will bring about calculation error. On the basis of freeboard phenomenon in curve way and the improvement of curve flow velocity, this paper gets a useful calculating method of bed roughness.

Key words: debris flow, freeboard in curve, bed roughness, velocity

摘要： 沟床糙率是泥石流流速计算的重要参数,由于理论计算十分复杂,在实际计算中人们多采用经验方法来确定,但这样使得流速计算会产生较大的误差.本文基于弯道超高现象以及弯道流速计算的改进,得出了一种较为实用的泥石流沟床糙率计算方法.

关键词: 泥石流, 弯道超高, 沟床糙率, 流速