Abstract：Based on field investigation and laboratory experiment, using average radius, sorting coefficient, tolerance, peak etc., partical size of Wanghugou debris flow were analyzed. Results show that the mean grain diameter in up, middle and down streams changed from large to small and then to large. The particles in whole gully had poor sorting property. In up and down stream, the skewness of the particle size tends to be more symmetrical than in middle stream. The peak values of up, middle, and down stream changed from large to small and to large again. It can be concluded if this area encounters heavy rain fall, debris flow would highly likely to happen, which will bring huge impact on daily work and life of local people.
2011, Vol. 9 
