Monitoring water volume changes in Poyang Lake using GF-1 and ICESat-2 data

doi:10.13474/j.cnki.11-2246.2025.0211

Abstract

Abstract: Poyang Lake as the study area and utilizes satellite altimetry data from GF-1 and ICESat-2. Based on the extraction of lake water surface area, a relationship model between lake water level and area is constructed using ICESat-2 altimetry data to estimate water volume changes in Poyang Lake from 2020 to 2023. It further analyzes the temporal variations in water volume and the primary influencing factors within the study area. The research results indicate that Poyang Lake experiences significant seasonal variations in water surface area, water level, and water volume, with the highest water storage in summer and the lowest in winter. Taking 2020 as an example, the maximum water volume change in Poyang Lake reached 15.6 km³ in August, while it decreased by 1.44 km³ from January to March of the same year, resulting in a maximum intra-annual difference of 17.04 km³. Over the past three years, Poyang Lake's water volume has shown a decreasing trend, with a decrease of 1.43 km³ from March 2020 to March 2023. Correlation analysis between water volume changes in Poyang Lake and regional precipitation and temperature reveals that precipitation is the primary meteorological factor influencing water volume changes in Poyang Lake, with a coefficient of determination (R²) of 0.78 between the two.

Key words: GF-1, water volume of lakes, satellite altimetry data, Poyang Lake, water surface elevation

CLC Number:

P237

LIN Jiayu, LIU Zhenbo, TONG Xudong, ZHANG Lijuan, YIN Lingfeng, ZHENG Chao. Monitoring water volume changes in Poyang Lake using GF-1 and ICESat-2 data[J]. Bulletin of Surveying and Mapping, 2025, 0(2): 58-63.

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