Abstract
Poyang Lake, Dongting Lake, and Taihu Lake are the largest freshwater lakes in the middle and lower reaches of the Yangtze River, China. In recent years, the eutrophication level of lakes has increased with the development of the social economy and caused many environmental and social problems. The concentrations of total nitrogen (TN) and total phosphorus (TP) are the key indicators of the degree of eutrophication, but the traditional ground monitoring methods are not capable of capturing such parameters in whole lakes with high spatial-temporal resolution. In this paper, empirical models are established and evaluated between the TN and TP and remote sensing spectral factors in the three lakes using Landsat 8 Operational Land Imager (OLI) satellite data and in-situ data. The results show that the inversion accuracy is higher than 75%. The TN and TP concentrations in the three lakes are inversed based on the Google Earth Engine (GEE) platform from 2014 to 2020 and their spatial-temporal variations are analyzed. The results show that the concentrations of TN and TP in Poyang Lake were decreased by 5.99% and 7.13% over 7 years, respectively, and the TN in Dongting Lake was decreased by 5.25% while the TP remained stable. The temporal changes in TN and TP concentrations displayed seasonal variations. A low concentration was observed in summer and high concentrations were in spring and winter. The average concentrations of TN and TP in Taihu Lake were higher than that of the other two lakes. The TP concentration was increased by 17.3% over 7 years, while the TN concentration remained almost stable. The variation in TN in Taihu Lake was the same as the growth cycle of algae, with higher value in spring and winter and lower value in summer, while the concentration of TP was lower in spring and winter and higher in summer. The spatial distribution of TN and TP concentrations in the three major lakes was significantly affected by human activities, and the concentrations of TN and TP were higher in areas near cities and agricultural activities.
Highlights
More than 2800 lakes are in China, with an area larger than 1 km2
The water quality parameters of total nitrogen (TN) and total phosphorus (TP) were inversed based on empirical models from ground observation data and Landsat 8 Operational Land Imager (OLI) remote sensing images at the three major lakes, Poyang Lake, Dongting Lake, and Tai Lake, in the middle and lower reaches of the Yangtze River
The concentrations of TN and TP were relatively high in Lake Taihu, with an increase in the past seven years, and relatively low in Poyang Lake and Dongting Lake, with a decrease in the past seven years
Summary
The middle and lower reaches of the Yangtze River have the largest freshwater lakes in China with many bigger cities It is a substantial agricultural and industrial base in China and one of the most economically developed regions in the country. Eutrophication is a form of organic pollution, mainly caused by the discharge of industrial wastewater, domestic sewage, and the use of fertilizers and pesticides It increases the water nutrients such as TN and TP and promotes the growth of algae in the water. The decomposed remains of the algae release nitrogen and phosphorus substances to continue this cycle and create a bloom in the lake [1,2] This will lead to the death of other aquatic organisms and destroy the ecological balance of the water environment [3]
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