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| Identification and spatiotemporal evolution patterns of water color in Wuliangsuhai Lake based on Sentinel-2 |
| Received:April 07, 2025 |
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| KeyWord:Wuliangsuhai Lake;Sentinel-2 images;Forel-Ule index;eutrophication;spatiotemporal variation |
| Author Name | Affiliation | | LI Xing | College of Chemistry and Environmental Sciences, Inner Mongolia Normal University, Hohhot 010022, China
Inner Mongolia Engineering Research Center for Water-Saving Agriculture, Inner Mongolia Normal University, Hohhot 010022, China | | CAO Dongmei | College of Chemistry and Environmental Sciences, Inner Mongolia Normal University, Hohhot 010022, China
Inner Mongolia Engineering Research Center for Water-Saving Agriculture, Inner Mongolia Normal University, Hohhot 010022, China | | ZHANG Fuquan | Tongliao Water Conservancy Development Center, Tongliao 028000, China | | QIU Yiran | College of Chemistry and Environmental Sciences, Inner Mongolia Normal University, Hohhot 010022, China
Inner Mongolia Engineering Research Center for Water-Saving Agriculture, Inner Mongolia Normal University, Hohhot 010022, China | | YI Lina | College of Chemistry and Environmental Sciences, Inner Mongolia Normal University, Hohhot 010022, China
Inner Mongolia Engineering Research Center for Water-Saving Agriculture, Inner Mongolia Normal University, Hohhot 010022, China | | GOU Mangmang | Inner Mongolia Institute of Mechanical and Electrical Technology, Department of Water Conservancy and Civil Engineering, Hohhot 010070, China |
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| Abstract: |
| In order to investigate the spatiol and temporal variations characteristics of water color in Wuliangsuhai Lake and evaluate the feasibility of using Forel-Ule index（FUI） for assessing nutrient status, this study extract monthly and annual FUI values based on Sentinel-2 remote sensing images from May to October（2017—2023）. In addition, carried out the study combined with the in-situ water quality monitoring data. The results show that：the spatiotemporal variation characteristics of FUI in Wuliangsuhai Lake were significant during the study period. The percentage of FUI high values area typically reached minimum values in July and maximum values in September. From 2017 to 2023, the proportion of FUI high values water area showed an N-shaped change, with the best water color condition in 2019. The FUI values was common drived by human activities, lake ecology, meteorological factors. Integrating these factors, the spatial characteristics of FUI in lake area are analyzed as follows：when compared with the northern, central, and southern lake regions, the western, eastern and the shorelines of all lake regions exhibit significantly higher FUI values. Water color presented a light yellowish. From 2017 to 2019, the comprehensive trophic level index（TLI） showed a decreasing trend from north to south（excluding the northern areas）, suggesting an overall reduction in eutrophication status throughout the lake. When aquatic system of Wuliangsuhai Lake under eutrophic state, FUI was negatively correlated with TLI（P>0.05）. This study demonstrates that Sentinel-2 satellite date can effectively monitor water color variations and assess trophic status in Wuliangsuhai Lake, providing a practical approach for long-term water quality monitoring with significant application value. |
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