講者 / Speaker：Brian J. Yanites

Associate Professor, Department of Earth & Atmospheric Sciences, Indiana University

演講主題 / Topic：

Cascading Land Surface Hazards as a Nexus in the Earth System: Lessons from Taiwan and Abroad

演講摘要 / Abstract：

Extreme events such as earthquakes, typhoons, and wildfires trigger cascading land surface hazards that connect Earth systems across space and time. Landslides, debris flows, floods, and sediment pulses form linked chains that reshape landscapes, disrupt ecosystems, and threaten infrastructure long after the initial trigger. In Taiwan, we quantify the magnitude of river aggradation following Typhoon Morakot and the 2024 Hualien Earthquake using aerial and drone imagery. These data reveal meters of channel aggradation that expanded flood inundation zones and altered long-term hazard exposure. Such post-event changes highlight how hazard cascades propagate beyond the initiating trigger, extending societal impacts over years to decades. By comparing Taiwan with other tectonically active, storm-prone regions, I illustrate both the general principles of cascading hazards and the local controls that influence their emergence. These lessons underscore the need for integrated, cross-disciplinary approaches to hazard science and resilience.

極端事件如地震、颱風與野火，常引發地表災害的連鎖效應，使地球系統在時空尺度上相互連動。山崩、土石流、洪水與泥沙堆積等災害鏈，不僅重塑地景、干擾生態系，也在事件結束後持續多年影響基礎設施與社會風險。

Yanites 教授將以臺灣為例，展示研究團隊如何透過空拍影像與無人機資料，分析莫拉克颱風及 2024 花蓮地震後的河道淤積與洪氾變化，揭示地表災害的「連鎖傳遞」如何擴大社會影響。透過與其他地區（如安地斯山脈與喜馬拉雅山）的比較，演講將探討地表災害的共通機制與在地差異，強調跨領域整合在災害科學與韌性研究中的重要性。

時間 / Time：10:00 a.m. – 12:00 p.m.　Thursday, November 20, 2025

地點 / Location：國立臺灣大學地理環境資源學系 305 教室 (Department of Geography, National Taiwan University, Room 305)

報名連結 / Registration Link：https://docs.google.com/forms/d/e/1FAIpQLSeYWsP5b6py5dmQ201FLCuoxaGKP-nvm7DnztRisp8VCqj5Uw/viewform?usp=preview

聯絡人：生態與地緣政治研究平台辦公室

電話：33665824