Glacier changes on Gaqiadiru Mountain of Yangtze River headwater monitored by GF-7 and other satellites
Glacier fluctuations have important indicative significance for local climate,as well as significant im-pacts on downstream water resource changes,and are highly prone to triggering glacier disasters.As the source of the Tuotuo River,the main source of the Yangtze River,and also a cluster region of surge-type glaciers,it is necessary to carry out long-term glacier monitoring in the Geladandong region.This article uses GF-7 stereo im-ages to extract the glacier elevation information of the Gaqiadiru Mountain glacier distribution in Geladandong Area of the source of the Yangtze River,and the SRTM GL1 is used to estimate the glacier elevation change and mass balance.At the same time,the Landsat series,High-resolution series and Ziyuan series images are used to extract the long time series glacier boundary,and the elevation and mass balance change of the glaciers in the study area from 2000 to 2021 and the area change from 1986 to 2021 are obtained.The results show that the GF-7 satellite is feasible for three-dimensional glacier monitoring,and the glacier area in the study area has de-creased from 193.85 km2 in 1986 to 176.98 km2 in 2021,the glacier area decreased by 18.87 km2 in 35 years(9.73%),and the average annual area shrinkage rate was 0.54 km2∙a-1;The average thickness of glaciers de-creased by 6.10 m(0.29 m∙a-1)from 2000 to 2021(Covered by GF-7 DEM),the volume of glaciers decreased by 1.02 km3,the cumulative loss of mass was(0.87±0.06)Gt,and the meters of water equivalent loss was(5.19±0.37)m w.e,the mass of the four surge-type glaciers are still decreasing although they aresurged;The average glacier thickness at the headwaters of the Yangtze River is the largest,with an average thickness of 11.34 m in 21 years and a thinning rate of 0.54 m∙a-1.
GF-7stereo mappingthe headwaters of the Yangtze RiverGaqiadiru Mountainthree-dimen-sional glacier changeremote sensing monitoring
万方数据
维普
