IMHE OpenIR  > Journal of Mountain Science  > Journal of Mountain Science-2016  > Vol13 No.1
Geomorphologic analysis and physico-dynamic characteristics of Zhatai-Gully debris flows in SW China
LIU Xi-lin; TANG Chuan; NI Hua-yong; ZHAO Yuan
Corresponding AuthorLIU Xi-lin
Source PublicationJournal of Mountain Science
AbstractZhatai gully is a typical debris flow channel in Butuo county of Sichuan province, southwestern China. The geomorphologic features are analyzed and the physical-dynamic characteristics are discussed on the basis of field investigation and laboratory tests. Geomorphologic analysis indicates that Zhatai-gully drainage in relation to debris flow can be divided into source area, transport area, and deposition area. The source area has a steep slope and has very limited vegetation cover, which favors runoff, allowing loose solid materials to be mobilized easily and rapidly. In the transport area, there are many small landslides, lateral lobes, and loose materials distributed on both banks. These landslides are active and constantly providing abundant source of soils for the debris flows. In the deposition area, three old debris-flow deposits of different ages can be observed. The dynamic calculation shows that within the recurrence intervals of50 and 100 years, debris flow discharges are 155.77m3/s and 178.19m3/s and deposition volumes are 16.39 × 104 m3 and 18.14 × 104 m3, respectively. The depositional fan of an old debris flow in the outlet of the gully can be subdivided into six layers. There are three debris flow deposits on left and two on the right side of the gully. Grain-size tests of sediments from the soil, gulley bed deposits, and the fresh and old debris flow deposits showed that high amounts of clay and fine gravel were derived from the soil in the source area whereas much of the gravel fraction were sourced from the gullybed deposits. Comprehensive analysis indicates that Zhatai gully is viscous debris-flow gully with moderateto high frequency and moderate to large magnitude debris flows. The risk of a debris flow disaster in Zhatai-gully is moderate and poses a potential threat to the planned hydroelectric dam. Appropriate engineering measures are suggested in the construction and protection of the planned hydroelectric station.
KeywordDebris Flows Geomorphologic Feature Zhatai Gully China
Indexed BySCI
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Document Type期刊论文
CollectionJournal of Mountain Science_Journal of Mountain Science-2016_Vol13 No.1
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GB/T 7714
LIU Xi-lin,TANG Chuan,NI Hua-yong,et al. Geomorphologic analysis and physico-dynamic characteristics of Zhatai-Gully debris flows in SW China[J]. Journal of Mountain Science,2016,13(1):137-145.
APA LIU Xi-lin,TANG Chuan,NI Hua-yong,&ZHAO Yuan.(2016).Geomorphologic analysis and physico-dynamic characteristics of Zhatai-Gully debris flows in SW China.Journal of Mountain Science,13(1),137-145.
MLA LIU Xi-lin,et al."Geomorphologic analysis and physico-dynamic characteristics of Zhatai-Gully debris flows in SW China".Journal of Mountain Science 13.1(2016):137-145.
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