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How do stream processes affect hazard exposure on alluvial fans? Insights from an experimental study

Journal of Mountain Science 2020年第4期17卷 753-772页

作者： Bruno MAZZORANA elisa ghiandoni Lorenzo PICCO Universidad Austral de Chile Faculty of SciencesInstituto de Ciencias de la Tierra5090000 ValdiviaChile Universidad Austral de Chile RINA–Natural and Anthropogenic Risks Research Center5090000 ValdiviaChile Universidad Austral de Chile Laboratory of HydromorphologyFaculty of Forest Sciences and Natural Resources5090000 ValdiviaChile University of Padova Department of LandEnvironmentAgriculture and Forestry35020 LegnaroItaly

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.

关键词： Alluvial fan Hazard Exposure Flood risk Experimental model Process similarity

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