Characteristics of Debris Flow in Lila Gully of Wangmo County in Guizhou Province
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Abstract:
Lila gully is a low-frequency debris flow gully. On June 6, 2011, most of the northern area of Wangmo County in Guizhou Province had the biggest rainfall in a century, which led to a large scale group of debris flow. The occurrence of massive mudslides caused great loss of life and property. Local transportation, communications, and other infrastructure have been damaged seriously. Based on the in-situ investigations of the material sources of debris flow and topographic conditions and interpolation of rainfall in Lila Gully, the formation mechanism of debris flow was analyzed. It suggested that the 1# tributary has steep slopes on both sides and large longitudinal gradient, which is not suitable for the accumulation of residual deposits as the deposits in the gully can be washed away easily under light rain conditions. Therefore, 1# tributary did not have the landslide conditions. Meanwhile, it found that 2# and 3# tributaries have gentle slopes on both sides and thick layer of residual deposits, which can lead to the occurrence of shallow landslide-induced debris flow, especially when the slope of both sides is about 20 to 40°. Consequently, the criteria for the occurrence of shallow debris flow in each tributary of Lila Gully under the same geological, topographic, and rainfall conditions were obtained.
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