Scholarlink

<p>Landslide-induced river damming and subsequent breaching represent significant cascading hazards in tectonically active regions, yet their full evolution is rarely documented. This study reconstructs a hazard chain in the Matia’an River, Taiwan, triggered by a sequence of two typhoons in 2025. Multitemporal optical imagery from 2014–2024 records a 63% expansion of the rockfall area, indicating progressive geomorphic degradation. InSAR time-series analysis reveals a three-stage kinematic evolution, including a recorded short-term acceleration immediately preceding the catastrophic collapse. Seismic waveform analysis precisely constrained the landslide onset to 09:54:39 UTC on July 21, 2025, with a total event duration of 117&#xa0;s. The failure occurred during the terminal phase of 274&#xa0;mm of cumulative rainfall from Typhoon Wipha. The resulting high-speed rock avalanche (45.3&#xa0;m/s) blocked the river, forming a landslide dam that exhibited transient vertical uplift during lake impoundment. The dam failed on September 23 during a second typhoon (Ragasa), producing a damaging outburst flood. This case illustrates how successive meteorological events interact with a preconditioned landscape to drive a multistage hazard sequence and demonstrates the utility of multisource remote sensing for documenting complex landslide processes in remote regions.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Remote sensing reconstruction of a typhoon-induced landslide–river damming–outburst flood cascade in the Matia’an River, Taiwan

  • 期刊论文

  • 发表日期：

    2026年5月4日

查看全文
  • Shengsen Zhou,
  • Weile Li,
  • Yusen Li,
  • Huiyan Lu,
  • Zhigang Li,
  • Xing Zhu

摘要

Landslide-induced river damming and subsequent breaching represent significant cascading hazards in tectonically active regions, yet their full evolution is rarely documented. This study reconstructs a hazard chain in the Matia’an River, Taiwan, triggered by a sequence of two typhoons in 2025. Multitemporal optical imagery from 2014–2024 records a 63% expansion of the rockfall area, indicating progressive geomorphic degradation. InSAR time-series analysis reveals a three-stage kinematic evolution, including a recorded short-term acceleration immediately preceding the catastrophic collapse. Seismic waveform analysis precisely constrained the landslide onset to 09:54:39 UTC on July 21, 2025, with a total event duration of 117 s. The failure occurred during the terminal phase of 274 mm of cumulative rainfall from Typhoon Wipha. The resulting high-speed rock avalanche (45.3 m/s) blocked the river, forming a landslide dam that exhibited transient vertical uplift during lake impoundment. The dam failed on September 23 during a second typhoon (Ragasa), producing a damaging outburst flood. This case illustrates how successive meteorological events interact with a preconditioned landscape to drive a multistage hazard sequence and demonstrates the utility of multisource remote sensing for documenting complex landslide processes in remote regions.