Risk evaluation of potential debris flow based on the improved grey correlation method
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Abstract:
The r isk ev aluation of the seco ndary debris flow disaster caused by t he earthquake in t he Longmenshan fault area w as co nducted in this paper. T he g rey cor relatio n method w as used to analyze the weights of sev en impact factor s, including the maximum o utput of debr is flow , w atershed ar ea, elevat ion difference, vegetat ion co verag e, loo se material reserv es, channel g radi2 ent r at io, and max imum precipitatio n in 24 hours. T he w eig hts wer e used t o r eplace the av erage w eig hts in the traditio na l g rey co rr elation met ho d and build the r isk evaluation model of debris flow . The r esults show ed that the w eig hts of water shed ar ea and lo ose materia l reser ves are g reater than those of ot her fact ors. The evaluatio n results w ere in line w ith the actual situatio n which indicat es the impro ved gr ey cor relation method can pro vide firm suppo rt fo r the preventio n design of debris flow .
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