Fig. 1. Geographical location of Qinghai Lake

Fig. 2. Technical flowchart

Fig. 3. Example of water range determination of Qinghai Lake in summer and autumn of 2000

Fig. 4. Interannual and annual variation of water area in Qinghai Lake from 1990 to 2020

Fig. 5. Interannual variation of water level of Qinghai Lake

Fig. 6. Fitting relationship between water level and area of Qinghai Lake from 1995 to 2020

Fig. 7. Areas with the largest changes of Qinghai Lake shoreline from 1990 to 2020

Fig. 8. Change process of Bird Island shoreline

Fig. 9. Change process of Sand Island shoreline

Fig. 10. Change process of Tibuka Bay shoreline

Fig. 11. Change process of Salu River entrance shoreline

Fig. 12. Interannual variation of precipitation at Gangcha Station and Chabcha Station from 1990 to 2020

Fig. 13. Comparison of interannual variation of runoff and precipitation （Gangcha station） in Qinghai Lake Ring Region

Fig. 14. Interannual variation of evaporation at Gangcha station from 1990 to 2010

Fig. 15. Evaporation trend of Qinghai Lake Basin from 1990 to 2017

Fig. 16. Interannual area change of Gahai Lake from 1990 to 2020