Poyang Lake is the largest freshwater lake in China. It is located in the middle and lower reaches of the Yangtze River in the north-central Jiangxi Province. As the largest Lake which is connecting the Yangtze River, the water ecological security of Poyang Lake affects the entire Yangtze River basin. Water transparency(SDD) is an important indicator of water quality, so it is of great significance to carry out routine monitoring of SDD using remote sensing methods. This study takes Poyang Lake as the experimental area, and uses the SDD as the inversion index to characterize water quality. Based on observation data from 2015 to 2020 and Landsat series images, the inversion of SDD model suitable for summer Poyang Lake was constructed by analyzing and comparing the correlation coefficients between different wave bands and the SDD under the condition of standardized modeling phase and "star-ground" collaborative matching. After verification by four sets of independent data, the mean R2 is 0.8621, the mean RSME is 15.37cm, and the mean MAPE is 23.6%. It is believed that the method used in this study can be well applied to the inversion of SDD in the Poyang Lake area, and also provides a new reference method for monitoring the transparency of inland water bodies under long-term observation conditions.
To study the patterns of algal blooms in Chaohu Lake, this article uses Sentinel-2 images as the data source and extracts algal bloom using the Normalized Difference Vegetation Index (NDVI). From 2019 to 2022, the dynamic monitoring of algal bloom in Chaohu Lake is conducted, analyzing the temporal and spatial changes in algal blooms, exploring the driving factors of algal blooms in Chaohu Lake. The results indicate that: (1) From 2019 to 2022, the scale of the annual outbreak of algal bloom in Chaohu Lake gradually decreased. The degree of water blooms significantly decreased. (2)Chaohu Lake has strong seasonal changes in water blooms, with severe outbreaks in summer and autumn when temperatures are higher, indicating that temperature is the main factor driving the outbreak of water blooms. (3) As the main pollutant discharge area of Hefei urban area, the northwest of Chaohu Lake is the core area for algal blooms, indicating that water quality is an important influencing factor leading to algal blooms in Chaohu Lake; From the spatial changes in the movement of algal blooms from the northwest and the coast of east lake towards the middle of the lake, and from the middle of the lake to the northwest, it is found that wind speed is more likely to suppress the outbreak of algal blooms.
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