GEE-based monitoring of long time-series changes of lake water bodies in the Yangtze-Huai River Basin
Lakes are important in regulating floods and providing water sources,and changes in water storage in the plains lake complexes of the Yangtze-Huai River Basin(CHRB)are critical for alleviating flood pressure and regulating runoff.To achieve long-term monitoring of water body changes in the basin,the study used the Google Earth Engine(GEE)cloud computing platform and water body extraction algorithms to calculate the water body frequency in the basin for a total of 22 years from 2000 to 2021,generated year-by-year 30-meter spatial resolution surface water body maps,and calculated the water body area in each year's abundant,flat,and dry water periods.It was found that the water bodies in the Yangtze and Huai River Basin are mainly distributed along the Yangtze River and Huai River,as well as in the basins where the five major freshwater lakes are located,and the area of water bodies in the basin fluctuates over the 22-year period,with the area of water bodies at the three frequencies being the lowest in 2011,and the highest in 2020 in the abundant and flat water periods.By analyzing the climate change in the Yangtze-Huai Basin during the same period,it was found that the trend of rainfall and water body area were almost the same,indicating that the change of water volume in the basin was mainly dominated by rainfall.This study will help to improve the scientific understanding of the seasonal hydrological dynamics of lakes in the Yangtze-Huai River Basin and provide a scientific basis for flood prevention and water resource management.
Yangtze-Huai River Basinwater frequencyGEEremote sensing monitoring
NETL
NSTL
万方数据
