ArticleScientific reports2026
Monitoring alpine wetland of Haizishan using Otsu method and Sentinel-1 SAR in Hengduan Mountains, China.
Article in Scientific reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
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.
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