Debris flows are the main
geological hazards in the Moxi basin, which locate on the eastern slope of the
M.T Minya Konka, Sichuan province, southwestern of China. The location of 49
debris flow gullies have been identified and mapped from the 1:50000 scale
through the extensive field survey across the Moxi basin. The historical events
data were collected from documents and visit to local residents, and were used
as the basis for frequency analysis. Anymore, topographic features of debris
flow gullies have been calculated using GIS software. The analysis showed that
73.5% of the debris flow gullies are not randomly distributed but concentrated
directly adjacent to the western side of Moxi fault, and only 26.5% are located
to the eastern side. The numbers, frequency, catchments area, gully length,
gully slope ratio of these debris flow gullies in Moxi basin were affected by
the glaciations and geological activity. The results show potential activity of
debris flow in Moxi basin is strong, this research is essential to debris flow
hazards mitigation.
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