Extraction and application of Forel-Ule index based on images from multiple sensors
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摘要: 水体颜色的定量表征可为内陆湖库综合水质的评估提供重要的参考数据。以华北内陆大型湖库官厅水库为研究对象,结合2016—2020年季相尺度的Sentinel-2和Landsat 8 OLI反射率数据,利用FUI(Forel-Ule index)水色指数反演算法,定量分析了官厅水库FUI水色的空间尺度、年内及年际尺度的异质特征; 为探究FUI水色与水体营养状态之间的耦合关系,分别利用色度角α和FUI水色指数与营养状态指数(trophic status index,TSI)进行建模; 并论证了FUI水色指数在不同传感器间的可比性及应用潜力。结果表明: ①在空间尺度上,官厅水库中心处FUI水色指数数值较低,在水库边缘处数值较高; ②在年内季相尺度上,FUI水色指数数值呈现出冬季最高,春季小幅度降低,夏季最低,秋季又上升的趋势; ③在年际尺度上,近3 a间FUI水色指数数值较前两年有所降低,水色表现为由黄棕色向黄绿色转变,这一点可能得益于北京市政府对官厅水库的有效治理; ④TSI与色度角α和FUI的Pearson相关系数分别为-0.85和 0.80,表明FUI水色与TSI指数具有强相关性; ⑤对同一天过境的Sentinel-2和Landsat 8 OLI进行FUI水色指数反演,数值分别为13.04和13.16,十分接近,表明FUI在不同传感器影像之间具有可比性,可利用多源长时序的遥感数据,实现FUI水色长时序数据的反演。FUI水色指数在水质营养状态评估方面具有明显的应用潜力和优势。Abstract: The quantitative characterization of water body color can provide important reference data for the comprehensive water quality assessment of inland lakes and reservoirs. The Guanting Reservoir is a large inland lake in North China. Based on FUI inversion using the seasonal-scale Sentinel-2 and Landsat 8 OLI reflectance data during 2016—2020, this study quantitatively analyzed the heterogeneous characteristics of Forel-Ule Index (FUI) of the Guanting Reservoir on the spatial, intra-annual, and inter-annual scales. To explore the coupling relationship between the FUI and the nutrient status of the water body, models were built using both hue angle α and FUI and the trophic status index (TSI). Moreover, this study demonstrated the comparability of FUI among different sensors and its application potential. The results are as follows. ① On the spatial scale, the FUI value was low at the center but high on the edge of the reservoir. ② On the seasonal scale within a year, the FUI value showed a trend of reaching the highest in winter, slightly decreasing in spring, reaching the lowest in summer, and rising again in autumn. ③ On the interannual scale, the FUI value in the latest three years was lower than that in the first two years during 2016—2020 and the water color changed accordingly from yellowish brown to yellowish green. These may be attributable to the effective governance of the Guanting Reservoir by the Beijing Municipal Government. ④ The Pearson correlation coefficient between TSI and α and that between TSI and FUI were -0.85 and 0.80, respectively, indicating a strong correlation between FUI and TSI. ⑤ The FUI values obtained through the inversion based on the Sentinel-2 and Landsat 8 OLI images of the same day were very approximate and were 13.04 and 13.16, respectively. This indicates that FUI is comparable between the images from different sensors. Therefore, the inversion of FUI can be achieved using the long time-series remote sensing data from multiple sensors. Meanwhile, FUI possesses notable application potential and advantages in the assessment of water quality and trophic status.
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Key words:
- Guanting Reservoir /
- hue angle /
- FUI /
- trophic status assessment /
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