STUDY ON THE HAZARD OF DEBRIS FLOW IN SMALL WATERSHED IN LOESS GULLY REGION BASED ON FLOW-R SOFTWARE:A CASE STUDY OF JIAOCHANG GULLY,JINGYUAN COUNTY,BAIYIN CITY OF CHINA
With the frequent occurrence of extreme climate and the rapid increase of human activities,the frequency of debris flow disaster is increasing in loess gully region,which has caused serious economic losses and casualties to local towns.Therefore,Jiaochang gull,Jingyuan County of Baiyin City was selected as the research area,comprehensive remote technology,field survey,ArcGIS software and Flow-R software were applied to study the hazard of debris Flow in small watershed.The results showed that the hazard probability of debris flow in the channel was obviously higher than that in other areas,and it was increased with the increasing of conditional probability.In the case of 10,50 and 100 years,the hazard area of debris flow was accounted for 16.60％,28.72％and 51.77％of the whole study area,respectively,and the proportion of extremely high and high hazard area was accounted for 20.15％,19.97％and.19.27％,severally.The results can provide a scientific basis for disaster prevention and reduction and land use and development in the region.
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