The 24th IAHR-APD Congress (24th IAHR-APD Congress)

313 / 2024-02-29 14:50:36

A preliminary study on water volume change of typical lakes in QTP region with the space-ground stereo monitoring system

lake water volume,Space-ground stereo monitoring system,GF-1,HJ-1,Salt Lake

Changjiang River Headwaters region and its surrounding areas is a sensitive area in response to climate change. The lakes in the Qinghai-Tibet Plateau (QTP), as important indicators of climate changes in the water cycle in the region, have undergone significant changes in recent years since the continued warming has resulted in the retreat of permafrost and glaciers, supplying water to the lakes. In this paper, the space-ground integrated stereo monitoring system is established in the Zonag Lake-Salt Lake basin by combining the multi-source satellite remote sensing images, in situ GPS/Geodetic leveling measurement, and the underwater topographic survey by unmanned ships. The multi-source time series satellite remote sensing images including Landsat/HJ-1/GF-1 data were used as the main data source to dynamically monitor the lakes in Zonag Lake-Salt Lake basin, and the area of these lakes is interpreted with GIS software. Combining the water depth data collected by field survey and SRTM data, the area-level-volume relationship of Salt Lake is established with the time series lake area interpreted from the time series multi-source remote sensing images. The water volume change of Salt Lake since 2011 is calculated with the precipitation and evaporation of the lake interpolated based on meteorological data. The relationship between the changes in lake inflow runoff and the changes in lake water volume, were be analyzed. The dynamical monitoring of Salt Lake shows in the data-deficient area changes in the growth of lake water volume can be effectively monitored with the space-ground integrated stereo monitoring system. Satellite remote sensing technology has enormous potential for disaster monitoring and early warning in data-deficient areas.