Abstract：[Background] The artificial accumulation site in the loess area is a new measure for Lanzhou city to expand the urban land space in recent years. It is inevitable to form more artificial landfill slopes at the edge of the site,which may become a potential material to be involved in debris flow.[Methods] This paper took the "4·19"debris flow disaster in Jianshui valley of Lanzhou city as an example. Combined with grain size analysis experiment, SEM image and field infiltration experiment, this paper discussed its characteristics and operation mode,and proposed corresponding treatment suggestions.[Results] 1)Materials with grain size <1 mm in the loess area accounted for 11.4 %-55.2 %,which was conducive to the initiation of debris flow. 2)Compared with two mud level survey sections with a distance of 170 m,the flow of the downstream section increased by 2.5 times,indicating that the loess subsidence caused by infiltration promoted the conversion rate of debris flow material. 3) The infiltration experiment showed that loess accumulation site had strong permeability. It basically reached a stable infiltration state in about 8 min under low water head conditions,and basically reached a stable infiltration state in about 12 min under high water head conditions. It caused soil softening in a short time, affecting the slope stability of artificial landfill site, and thus improved the material conversion rate of debris flow. 4) The flow pattern of debris flow induced by artificial accumulation site in the loess area is complex and changeable,which has the characteristics of wavy flow and intermittent flow.[Conclusions] On this basis,authors propose a prevention model that combines process management and key protection.
刘兴荣, 张连科, 董耀刚, 宿星, 王喜红. 黄土堆填场地转化为泥石流物质过程——以兰州市碱水沟为例[J]. 中国水土保持科学, 2024, 22(2): 73-80.
LIU Xingrong, ZHANG Lianke, DONG Yaogang, SU Xing, WANG Xihong. Debris flow disaster induced by artificial accumulation site in loess area: An instance of Jianshui valley, Lanzhou city. SSWC, 2024, 22(2): 73-80.
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2024, Vol. 22 
