Estimating contribution of permafrost to lake expansion by SBAS-InSAR: a case study from Hohxil Lake basin in the Tibetan Plateau

Shan Zhao; Changmao Liang; Hong Yang; Bingkang Nie; Baojin Qiao; Hengliang Guo; Rongrong Zhang

doi:10.1117/12.2667888

10 February 2023 Estimating contribution of permafrost to lake expansion by SBAS-InSAR: a case study from Hohxil Lake basin in the Tibetan Plateau

Shan Zhao, Changmao Liang, Hong Yang, Bingkang Nie, Baojin Qiao, Hengliang Guo, Rongrong Zhang

Author Affiliations +

Proceedings Volume 12552, International Conference on Geographic Information and Remote Sensing Technology (GIRST 2022); 125521A (2023) https://doi.org/10.1117/12.2667888
Event: International Conference on Geographic Information and Remote Sensing Technology (GIRST 2022), 2022, Kunming, China

Abstract

Due to climate warming and increased precipitation, the permafrost of the Tibet Plateau (TP) has undergone serious degradation along with obvious lake expansion in recent decades. Model simulation is often used to analyze the contribution of permafrost melting to lake expansion, which may have many limitations. Taking Hohxil Lake (HL) basin over north TP as an example, this study makes full use of Sentinel-1 images by an improved small baseline subset interferometric technique (SBAS-InSAR), monitors the permafrost deformation from 2015 to 2020, and estimates its contribution to the lake expansion. The results show that the permafrost settlements mainly occur in the flat terrain around HL. The average line of sight (LOS) de-formation rate of permafrost is -3.59 ± 0.001 cm/yr, where there existed many obvious funnel-shaped thawing areas around the lake, indicating a close relationship between lake expansion and permafrost under-ground ice melting. The long-term linear deformation rate of underground ice is inverted by the traditional linear model, and the melting rate is estimated to be (31.17 ± 0.0054) ×10⁶ m³/yr with 9.3% contribution to the HL expansion. This study takes full advantage of Interferometric Synthetic Aperture Radar (InSAR) to quantitatively analyze the contribution of permafrost to lake expansion, which provides a new insight into the study of permafrost hydrological process and the proposed method can be easily extended to analyze lake water budget for underground ice in other watershed over the TP.

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Shan Zhao, Changmao Liang, Hong Yang, Bingkang Nie, Baojin Qiao, Hengliang Guo, and Rongrong Zhang "Estimating contribution of permafrost to lake expansion by SBAS-InSAR: a case study from Hohxil Lake basin in the Tibetan Plateau", Proc. SPIE 12552, International Conference on Geographic Information and Remote Sensing Technology (GIRST 2022), 125521A (10 February 2023); https://doi.org/10.1117/12.2667888

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KEYWORDS

Deformation

Ice

Interferometric synthetic aperture radar

Glaciers

Interferograms

Climate change

Synthetic aperture radar

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