Lahar Risk-Division Of Changbai Moutian Region, China

According to the characteristics of lahar deposit, 9 important influence factors of lahar deposition are selected, which are stratigraphic age, lithology, weathering degree, accumulation thickness, elevation, relative height, longitudinal gradient, vegetation type and vegetation coverage. The subjective and objective weights are obtained respectively by Valued Iteration Multi-Expert Determination and Rough Set. Synthesis weights are acquired by combining subjective and objective weights. Influence factors are divided into four levels. The four levels are given 1-4 points respectively, according to a certain division standard. Classification zoning maps of 9 influence factors were obtained respectively by field investigation, data collection, remote sensing, numerical calculation and DEM model calculation. The risk level division map of Changbai Mountain region is eventually obtained through stack analyzing by GIS, according to the synthesis risk degree. Synthesis risk degree is acquired by combining the influence value of each factor and their synthesis weights.