In Longquan County of Zhejiang Province

the geological environment is complex

the mountain disasters are serious.It is the high risk area of debris flow in Zhejiang Province.With the development of tourism and economy

it becomes urgent to study the characteristics and counter measures of debris flows in Longquan City.With the help of census

remotesensing and expertinquiry

146 gullys were surveyed

among which 96 was made by major investigation and 49 by typical investigation

46 potential debris flow dangers were identified.Through the survey and analysis

six characteristics of small watershed debris flow geohazard in Longquan City were summarized:wide distribution of debris flows in this area

breaking out mostly in typhoon and flood season

distributing mostly along fractures

suitable geographic conditions for the form ation of debris flow

high incidence of debris flow in lava

possible occurrence of debris flow in areas with both water loss and soil erosion and high-covered vegetation.Some corresponding count ermeasures were proposed to provide a rational basis for the prevention and treatment of debris flows in Longquan City.