Formation Mechanism and Risk Assessment of Debris Flow in Sesiman Gullyof Daduhe River
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Abstract:
Sesiman gully is the main tributary at the right bank of upstream of Daduhe River. Debris flow occurred in the gully, thus the security of hydropower station at the gully entrance is an important problem.. In this paper, on the basis of field investigations and comprehensive laboratory analysis, the formation conditions and risk assessment of debris flow in the Sesiman gully were discussed. The results showed that (1) the host rock of Sesiman gully is Yanshanian granite which has low weathering degree, but the glacial till is well developed and the main deposit fan at the gully entrance was formed in Last Glacial of Late Pleistocene; (2) the hydrologic conditions have varied significantly with the occurrence of low-frequency debris flow since Holocene; and (3) a huge dam-breaking debris flow can occur under the conditions of earthquake and extreme rainfall. The risk assessment results of debris flow in the Sesiman gully indicated that the gully has high risk of occurrence of debris flow.
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