Title: Layout methods of control works preventing large scale debris flows in Wenchuan earthquake area
Abstract:Debris flows were more active in four years after the Wenchuan earthquake and there were several extra-large occurrences. This paper proposed three types of initiation mechanism of debris flow : burst...Debris flows were more active in four years after the Wenchuan earthquake and there were several extra-large occurrences. This paper proposed three types of initiation mechanism of debris flow : burst-style on gentle slope , erosion-style on moderate slope , and soil liquefaction-style on steep slope. Effect of dams on debris flow was also analyzed. The results indicats that the large debris flow would block the mainstream river and the boulders transported into the river might increase the destructive power and the duration of blockage. The dam formed by debris flow would aggravate the disaster in the upstream. Series of layout methods have been proposed based on the formation mechanism of debris flow and its disaster : a layout method of control works preventing debris flow to avoid blocking the main river ; the groups of slit-trap dams with different openings in different grades ; the groups of check dams stabilizing source soil ; and the step-pool architecture formed by boulders in the gully bed. The control work system is designed on the basis of the transport capacity of the mainstream water flow , in which the discharge of debris flow drained by drainage channel is designed to be equal to the transport capacity of the river , and the discharge beyond is distributed to the dam system. Various engineering scientifically share the burden of debris flow. The combination of these methods is expected to modulate large scale debris flow effectively.Read More
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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Cited By Count: 2
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