Comparative study on active layer depth differences between hummocks and thermokarst depressions in the Eboling area of the Qilian Mountains
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Under the background of global warming, the deepening of the thickness of the active layer is one of the main characteristics of permafrost degradation, but its changes have strong spatial heterogeneity, especially in complex mountain environments. Taking the Erbo Ridge in the Heihe River Basin of the Qilian Mountains as the research area, the method of drilling is used to explore the difference of the melting depth of the underlying active layer between the frost-heaving grass hills and the thermal-thaw depressions at the quadrature scale. The results show that: from June to October, the melting depth of the active layer in the frost heaving grass hills and thermal thaw depressions varies from (44.484.97) to (118.3820.94) cm and (29.227.42) to (93.4015.45) cm, respectively. , and the thawing depth of the active layer of the frost heaving grass mound deepened faster than that of the thermal thaw depression. On the quadratic scale, the difference in the maximum thawing depth of the underlying active layer between the two micro-topography is obvious. The melting depth of the active layer at the frost-heaving grass hill is twice that of the thermal-thaw depression. due to differences in water volume. In addition, the thermal state of the active layer under the two micro-topography was simulated with the help of a one-dimensional heat conduction model, and the results showed that the difference of soil moisture resulted in a shallower melting depth in the thermal melting depression than in the frost heaving grass hill. Under the mountain environment, the study on the difference of the melting depth of the active layer between different micro-topography will help to provide reliable technical support for the future development of high-precision active layer melting depth mapping.
