Variation characteristics of Poyang Lake water area and its response to meteorological factors in the past 35 years

Abstract

The hydrological situation of Poyang Lake has undergone changes due to the influence of climate change and human activities. Its typical throughput and seasonal variation characteristics have attracted much attention. Research on the long-term hydrological variation of Poyang Lake needs to be enriched. Using remote sensing images from 1986 to 2020 and combining them with the Normalized Difference Vegetation Index (NDVI), this study extracts the water area of Poyang Lake and analyzes its variation characteristics. The results show that the water area of Poyang Lake has a consistent periodic variation with meteorological factors. Both the water area and meteorological factors have a main period of 18 m (months). Water area change points occurred in 2003, 2010, and 2016. In different research periods, there is a significant correlation between the water area and meteorological factor changes. Furthermore, the correlation between water vapor pressure and precipitation with the water area change is the strongest. HIGHLIGHTS The change of the Poyang Lake water area in long time series was studied.; The change of long-term meteorological factors was studied.; The response relationship between the water area and meteorological factors was studied.; Wavelet analysis and M-K mutation test were applied.; Multi-source long time series remote sensing image application was applied.;

Keywords

• longtime series
• ndvi
• poyang lake water regime change