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<p>This study focuses on delineating water extent within the alpine wetlands of Haizishan, Qinghai-Tibet Plateau, a meteorologically complex region. Situated within a 6,000&#xa0;km² Quaternary ice sheet landscape with over 600 water bodies, this area offers a crucial setting to examine climate change impacts on high-altitude wetland systems. Employing Sentinel-1 SAR data and the Google Earth Engine (GEE) platform, we implemented an Improved OTSU algorithm, achieving &gt; 95% accuracy in water surface delineation despite persistent cloud cover. Notably, wetland water extent expanded from 52.9&#xa0;km² to 54.8&#xa0;km² between 2015 and 2022, correlating with increased precipitation. This expansion, and its precipitation-driven nature, distinguishes these non-glacial-fed wetlands hydrologically from glacial water bodies in the broader region, particularly impacting shallower wetland areas sensitive to thermal variations.</p>

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Monitoring alpine wetland of Haizishan using Otsu method and Sentinel-1 SAR in Hengduan Mountains, China

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月29日

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  • Xiaoxiong Li,
  • Jiyun Li,
  • Zhen Xing,
  • Sha Liu

摘要

This study focuses on delineating water extent within the alpine wetlands of Haizishan, Qinghai-Tibet Plateau, a meteorologically complex region. Situated within a 6,000 km² Quaternary ice sheet landscape with over 600 water bodies, this area offers a crucial setting to examine climate change impacts on high-altitude wetland systems. Employing Sentinel-1 SAR data and the Google Earth Engine (GEE) platform, we implemented an Improved OTSU algorithm, achieving > 95% accuracy in water surface delineation despite persistent cloud cover. Notably, wetland water extent expanded from 52.9 km² to 54.8 km² between 2015 and 2022, correlating with increased precipitation. This expansion, and its precipitation-driven nature, distinguishes these non-glacial-fed wetlands hydrologically from glacial water bodies in the broader region, particularly impacting shallower wetland areas sensitive to thermal variations.