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Article

Evaluating the Landslide Stability and Vegetation Recovery: Case Studies in the Tsengwen Reservoir Watershed in Taiwan

Department of Water Resources Engineering and Conservation, Feng Chia University, Taichung 40724, Taiwan
Academic Editor: Monica Papini
Water 2021, 13(24), 3479; https://doi.org/10.3390/w13243479
Received: 22 October 2021 / Revised: 2 December 2021 / Accepted: 2 December 2021 / Published: 7 December 2021
The sediment yield from numerous landslides triggered in Taiwan’s mountainous regions by 2009 Typhoon Morakot have had substantial long-term impacts on the evolution of rivers. This study evaluated the long-term evolution of landslides induced by 2001 Typhoon Nari and 2009 Typhoon Morakot in the Tsengwen Reservoir Watershed by using multiannual landslide inventories and rainfall records for the 2001–2017 period. The landslide activity, vegetation recovery time, and the landslide spatiotemporal hotspot analyses were used in the study. Severe landslides most commonly occurred on 35–45° slopes at elevations of 1400–2000 m located within 500 m of the rivers. The average vegetation recovery time was 2.29 years, and landslides with vegetation recovery times exceeding 10 years were most frequently retrogressive landslide, riverbank landslides in sinuous reaches, and the core area of large landslides. The annual landslide area decline ratios after 2009 Typhoon Morakot in Southern Taiwan was 4.75% to 7.45%, and the time of landslide recovery in the Tsengwen reservoir watershed was predicted to be 28.48 years. Oscillating hotspots and coldspots occupied 95.8% of spatiotemporal patterns in the watershed area. The results indicate that landslides moved from hillslopes to rivers in the 2001–2017 period because the enormous amount of sediment deposited in rivers resulted in the change of river geomorphology and the riverbank landslides. View Full-Text
Keywords: landslide evolution; landslide activity; vegetation recovery time; spatiotemporal hotspot landslide evolution; landslide activity; vegetation recovery time; spatiotemporal hotspot
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MDPI and ACS Style

Wu, C.-H. Evaluating the Landslide Stability and Vegetation Recovery: Case Studies in the Tsengwen Reservoir Watershed in Taiwan. Water 2021, 13, 3479. https://doi.org/10.3390/w13243479

AMA Style

Wu C-H. Evaluating the Landslide Stability and Vegetation Recovery: Case Studies in the Tsengwen Reservoir Watershed in Taiwan. Water. 2021; 13(24):3479. https://doi.org/10.3390/w13243479

Chicago/Turabian Style

Wu, Chun-Hung. 2021. "Evaluating the Landslide Stability and Vegetation Recovery: Case Studies in the Tsengwen Reservoir Watershed in Taiwan" Water 13, no. 24: 3479. https://doi.org/10.3390/w13243479

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