How do stream processes affect hazard exposure on alluvial fans? Insights from an experimental study
文献类型：期刊论文
| 作者 | Mazzorana, Bruno; Ghiandoni, Elisa; Picco, Lorenzo |
| 刊名 | JOURNAL OF MOUNTAIN SCIENCE
 |
| 出版日期 | 2020 |
| 卷号 | 17期号:4页码:753-772 |
| 关键词 | Alluvial fan Hazard Exposure Flood risk Experimental model Process similarity |
| ISSN号 | 1672-6316 |
| DOI | 10.1007/s11629-019-5788-x |
| 文献子类 | Article |
| 英文摘要 | Alluvial fans are among the most privileged settlement areas in many mountain regions. These landforms are particularly dynamic being episodically affected by distributary processes generated by extreme flood events. Addressing risk assessment entails determining hazard exposure and unravelling how it might be related to process loading and to process dynamics once the flow becomes unconfined on the surface of alluvial fans. By following a 'similarity of process concept', rather than by attempting to scale a real-world prototype, we performed a set of 72 experimental runs on an alluvial fan model. Thereby, we considered two model layouts, one without a guiding channel and featuring a convex shape and the other one with a guiding channel, a bridge, and inclined but planar overland flow areas as to mirror an anthropic environment. Process magnitude and intensity parameters were systematically varied, and the associated biphasic distributary processes video recorded. For each experiment, the exposure was detected by mapping the exposed area in a GIS, thereby discerning between areas exposed to biphasic flows and the associated depositional phenomena or to the liquid flow phase only. Our results reveal that total event volume, sediment availability and stream power in the feeding channel, as well as depositional effects, avulsion, and channelization on the alluvial fan concur to determine the overall exposure. Stream process loading alone, even when rigorously defined in terms of its characterizing parameters, is not sufficient to exhaustively determine exposure. Hence, further developing reliable biphasic simulation models for hazard assessment on settled alluvial fans is pivotal. |
| 电子版国际标准刊号 | 1993-0321 |
| 语种 | 英语 |
| WOS记录号 | WOS:000525174500001 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/46792]  |
| 专题 | Journal of Mountain Science_Journal of Mountain Science-2020_Vol17 No.4 |
| 推荐引用方式 GB/T 7714 | Mazzorana, Bruno,Ghiandoni, Elisa,Picco, Lorenzo. How do stream processes affect hazard exposure on alluvial fans? Insights from an experimental study[J]. JOURNAL OF MOUNTAIN SCIENCE,2020,17(4):753-772. |
| APA | Mazzorana, Bruno,Ghiandoni, Elisa,&Picco, Lorenzo.(2020).How do stream processes affect hazard exposure on alluvial fans? Insights from an experimental study.JOURNAL OF MOUNTAIN SCIENCE,17(4),753-772. |
| MLA | Mazzorana, Bruno,et al."How do stream processes affect hazard exposure on alluvial fans? Insights from an experimental study".JOURNAL OF MOUNTAIN SCIENCE 17.4(2020):753-772. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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