石羊河流域冰川变化与地形因子的关系探究

Taking the Shiyang River basin of Gansu Province as the research area, using GIS and RS technologies combined with manual visual interpretation, the glacier boundary remote sensing images were extracted of 1995, 2002, 2009, 2015 and 2016. Three terrain factors, i. e., slope, orientation and elevation, are extracted, in combine with DEM data. Based on correlation analysis and GeoDetector, the correlation between glacier change and topographic factor was analyzed, and the spatial relationship between glacier change and topographic factors was studied. The results show that: (1) the annual average area change rate of glaciers in the region had changed from-1.27% • a^-1 in 1973-1995 to-2. 87% • a^-1 in 2015-2016;the ablation rate had accelerated, and the small glaciers with an area less than 0. 1 km2 had retreated significantly;(2) the main orientations of glacial distribution in the Basin were N, NE and NW, which had a certain correlation with the change of the glaciers;but those on the south slopes had retreated faster;(3) the slope had related to the change of glacier, so did the altitude, which had controlled the ablation rate of glaciers;the lower the altitude, the fast the glacier retreating;(4) the influence of topographic factors on spatial differentiation of glacial changes was significantly different;altitude was the most control factor for spatial differentiation of glacial changes, followed by orientation and then by slope. © 2019 Science Press (China).

Study on the relationship between glacier change and topographic factors in the Shiyang River basin

Taking the Shiyang River basin of Gansu Province as the research area, using GIS and RS technologies combined with manual visual interpretation, the glacier boundary remote sensing images were extracted of 1995, 2002, 2009, 2015 and 2016. Three terrain factors, i.e., slope, orientation and elevation, are extracted, in combine with DEM data. Based on correlation analysis and GeoDetector, the correlation between glacier change and topographic factor was analyzed, and the spatial relationship between glacier change and topographic factors was studied. The results show that:(1) the annual average area change rate of glaciers in the region had changed from -1.27%·a^-1 in 1973-1995 to -2.87%·a^-1 in 2015-2016; the ablation rate had accelerated, and the small glaciers with an area less than 0.1 km² had retreated significantly; (2) the main orientations of glacial distribution in the Basin were N, NE and NW, which had a certain correlation with the change of the glaciers; but those on the south slopes had retreated faster; (3) the slope had related to the change of glacier, so did the altitude, which had controlled the ablation rate of glaciers; the lower the altitude, the fast the glacier retreating; (4) the influence of topographic factors on spatial differentiation of glacial changes was significantly different; altitude was the most control factor for spatial differentiation of glacial changes, followed by orientation and then by slope.