Author(s): Yifan Yang
Linked Author(s): Yifan Yang
Keywords: Fluvial scour; Extreme floods; Climate change; River management; Sediment transport
Abstract: The interplay of local and general scour in fluvial environments is profoundly influenced by the dynamic coupling of flow and sediment during extreme flooding events. Concurrently, the growing impacts of climate change amplify the challenges in sustainable river management, as they introduce more pronounced long-term variabilities in scour and erosion. Addressing these combined challenges necessitates a refined research methodology that encompasses both the immediate and prolonged scour processes. In this presentation, the speaker will highlight recent research insights that embody a dynamic perspective, focusing on: 1) the mechanisms of local and general riverbed scour in bridge-contracted compound channels during extreme floods, accounting for significant bed mobility (Yang et al. 2021) (see Fig.1); 2) the intricacies of live-bed scour at instream structures as they respond to fluvial bedform migration (Yang et al., 2023); 3) the distinctive and acute riverbed aggradation alongside severe bank erosion observed in New Zealand's proglacial rivers, exemplified by the Waiho River (Beagley et al., 2020) (see Fig. 2). Particularly, the presentation will showcase our experimental works in large-scale flumes and field survey data using airborne lidar on manned vehicles. We expect that findings provide more insights into the pivotal fluvial scour and sediment transport processes that can not only benefit the academic community but also assist with natural hazards mitigation in the future.
Year: 2023