| According to the actual work of geological disaster prevention and control in Danba county from 2015 to 2017,the author combined with the previous work and basic data of disaster prevention plan,flood period investigation,geological disaster detailed investigation,emergency investigation and so on,and based on the statistics of 283 hidden debris flow hidden danger points at the end of 2017,the various types of debris flow disasters in the whole county Characteristics,formation conditions,influencing factors and disaster mechanism were analyzed statistically.Firstly,the basic situation of the regional geological environment in Danba county is expounded.Danba county is located in the transition zone of the east of the Qinghai Tibet Plateau to the Sichuan basin.The landform and landform are mainly high mountain canyon,and the county climate is vertically changed.The five rivers of the great river,the Xiaojin River,the gamaszah River,the East Valley River and the Dadu River are developed in the whole region.The branches of the two sides of the main river are extremely developed.The regional lithology and geological structure are complex,the contradiction between man and land is prominent,and human engineering activities are very strong.Through the statistical analysis of the 283 debris flow disasters time,spatial distribution characteristics and classification characteristics in Danba County,it is found that the debris flow disaster in Danba county is very uneven in time and space,and the distribution of debris flow is relatively concentrated on the location and time period,and the debris flow disaster occurs at night in the night of May to September,And it has a group of hair.On this basis,the control and influence of landform,geomorphology,stratigraphic lithology,geological structure,precipitation,earthquake and human engineering activities on the debris flow disaster in Danba county are preliminarily studied.The special terrain and geomorphology of the mountains and canyons in Danba County provide favorable spatial conditions for the formation of debris flow disasters,and the erosion and erosion of the mountains and the middle and high mountain canyon are the main topography and geomorphology environment of the development of the county debris flow.Rainfall is a necessary condition for the occurrence of debris flow in Danba county.Human engineering activities cause soil erosion and lead to an upward trend of debris flow disasters.The debris flow disasters in Danba county are combined with other disasters and form a disasterconnection.The slope geological disasters not only provide sufficient source of debris flow,but also cause the blockage of the debris flow,and have a magnifying effect on the debris flow.On the basis of the preliminary study,the stability and development trend of debris flow disaster in Danba county are analyzed.The 95% debris flow disasters in Danba county are mostly in the formation period and development period.The debris flow of the current stability and basic stability is 217,accounting for 76.7% of the total,and the trend of the debris flow geological disaster development tends to be unstable most(Gao Yi Hair.Therefore,it is necessary to strengthen the prevention and control of debris flow geological disasters.The prevention and control work should be carried out in an orderly way.In particular,it is necessary to strengthen the construction of group monitoring system and to innovate monitoring and early warning methods(such as fireworks early warning).Fundamentally,debris flow disaster management is achieved.All in all,according to the analysis and study of the debris flow disaster in Danba County,the prevention and control work of debris flow disaster in this county is very heavy and far away.Some conclusions and suggestions of this paper have certain guiding significance for the prevention and control of debris flow geological disasters in Danba County in the future. |
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