[Relations of landslide and debris flow hazards to environmental factors].
To clarify the relations of landslide and debris flow hazards to environmental factors is of significance to the prediction and evaluation of landslide and debris flow hazards. Base on the latitudinal and longitudinal information of 18431 landslide and debris flow hazards in China, and the 1 km x 1 km grid data of elevation, elevation difference, slope, slope aspect, vegetation type, and vegetation coverage, this paper analyzed the relations of landslide and debris flow hazards in this country to above-mentioned environmental factors by the analysis method of frequency ratio. The results showed that the landslide and debris flow hazards in China more occurred in lower elevation areas of the first and second transitional zones. When the elevation difference within a 1 km x 1 km grid cell was about 300 m and the slope was around 30 degree, there was the greatest possibility of the occurrence of landslide and debris hazards. Mountain forest land and slope cropland were the two land types the hazards most easily occurred. The occurrence frequency of the hazards was the highest when the vegetation coverage was about 80%-90%.
Zhang
Guo-ping
GP
National Meteorological Center, Beijing 100081, China. zhanggp@cma.gov.cn
Xu
Jing
J
Bi
Bao-gui
BG
D002681:China; D018556:Crops, Agricultural / Q000254:growth & development; D004190:Disasters; D004777:Environment; D055876:Landslides; D063245:Plant Development; D018570:Risk Assessment; D014197:Trees / Q000254:growth & development