Study on water color of Tonle Sap Lake in Cambodia based on FUI model
XU Yang1， WANG Ye2， LU Jianzhong1， FENG Lian2
1.State Key Laboratory of Information Engineering in Surveying， Mapping and Remote Sensing，Wuhan University， Wuhan 430079， China；2.School of Environmental Science and Engineering， Southern University of Science and Technology， Shenzhen， Guangdong 518055， China
Abstract：Tonle Sap Lake is the largest freshwater lake in Southeast Asia. Study on the spatial-temporal distribution of its water color could provide important information for assessing the change of comprehensive states of water quality. This paper used MODIS surface reflectance products from 2000 to 2018. Based on Forel-Ule Index (FUI) model， the interannual and monthly variation of the hue angle and its relationship with water surface area was quantitatively analyzed. The spatial distribution of water color change rate as well as the changes of trophic states were also characterized. The results showed that firstly the water color of Tonle Sap Lake changed slightly from yellow to green in 19 years， and the monthly variance decreased from 2014 to 2016. Secondly， the monthly discrepancy of hue angle was distinct. There was a significant correlation between the hue angle and area of Tonle Sap lake for 8 months. The most positive and negative correlation occurred in June of rainy season (R＝0.72) and December of dry season (R＝－0.86). Thirdly in the representative months of rainy season and dry season， the spatial distribution of interannual change rate of hue angle was quite different. The change range in December was higher than that in June， and few regions were evaluated as significant in both months. Lastly， the interannual trophic state of Tonle Sap Lake in December was different from that in June in which “eutrophication” was dominant. Concisely， this study provided basic data support for water quality monitoring and management of Tonle Sap Lake on the basis of trophic state assessment and the quantification of water color and its spatial-temporal distribution.
许 杨,王 野,陆建忠,冯 炼. 基于FUI模型的柬埔寨洞里萨湖水体颜色研究[J]. 华中师范大学学报(自然科学版), 2020, 54(3): 454-462.
XU Yang,WANG Ye,LU Jianzhong,FENG Lian. Study on water color of Tonle Sap Lake in Cambodia based on FUI model. journal1, 2020, 54(3): 454-462.
2020, Vol. 54 
