Study on the distribution law and evolution trend of debris flow hazards in Yanqing,Beijing
Debris flow is a highly destructive and sudden geological disaster phenomenon in mountainous areas,and is one of the much serious and harmful types of geological disasters in Beijing's mountainous areas.Most research on debris flow disasters in Yanqing district,Beijing mainly focused on local or single basin debris flow in gullies,few research analyzed the characteristics,distribution patterns and evolution characteristics of regional debris flow hazards.This paper studied the hidden dangers of debris flow in whole Yanqing district so as to provide theoretical basis for the early warning and prediction of debris flow disasters in mountainous areas as well as disaster prevention and reduction.By collecting relevant literature and materials and conducting a detailed investigation of the development characteristics of debris flow hazards,this paper systematically analyzed the disaster background of debris flow hazards,sorted out the inherent connections between natural geography,geological background and human activities,studied the gully and source characteristics of debris flow hazards,the distribution characteristics of geomorphic morphology,terrain slope,rainfall conditions,and stratigraphic lithology in the watershed where debris flow hazards are located,explored the distribution patterns of debris flow,water and stone flow,as well as the development and decline stages of debris flow hazards,clarified the transformation process of debris flow hazards.The evolution trend of debris flow hazards in Yanqing district was found mainly in the development and decline stages,the hidden danger of debris flow in Yanqing district belongs to rainstorm-gully-branch gully group type debris flow,the scale of debris flow is closely related to the topography and geomorphology of the basin,the accumulation and dynamic change of loose deposits in the gully area,and the rainstorm situation.This research results will provide scientific basis and technical reference for the investigation,prediction,monitoring and early warning of debris flow.
hidden danger of debris flowdistribution rulegeologic hazardYanqing
国家科技期刊平台
NSTL
万方数据
