Yoshihiro IIJIMA, Mie University, Japan
Alexander FEDOROV, Melnikov Permarost Institute, Russian Federation
Yuichiro FUJIOKA, Kyushu University, Japan
Hotaek PARK, Japan Agency for Marine Earth Science and Technology, Japan
Lyudmila LEBEDEVA, Melnikov Permarost Institute, Russian Federation
Tetsuya HIYAMA, Nagoya University, Japan
David GUSTAFSSON, Swedish Meteorological and Hydrological Institute, Sweden
Hydroclimatic change, permafrost thawing and related landscape transformations in eastern Siberia have been apparent during recent decades. At the same time, problems with catastrophic flooding and loss of agricultural land are emerging concerns for the local society. Fundamental and transdisciplinary research is needed to fill critical gaps in our understanding of the interrelationships among climate impacts on key processes in the permafrost landscape, and the corresponding societal challenges related to transport infrastructure, flood hazard prevention, and agriculture. In this context, a transdisciplinary project under the Belmont Forum partnership entitled HYdrology, PErmafrost and resilience in Eastern Russian Arctic and Subarctic (HYPE-ERAS) has been launched since 2020. This project aims to improve understanding of climate change impacts on hydrocloimatological regimes and landscape transformations induced by permafrost degradation and corresponding societal challenges, in the Republic of Sakha (Yakutia). As for one of the working package focusing on the transdisciplinary analysis of resilience and societal needs, the visualization of permafrost environment degradation due to climate change has been developed and started to share with local communities. Interferometric SAR analysis using ALOS2-PALSAR2 was carried out for the Central Yakutia to evaluate geomorphic subsidence due to thermokarst during the 2010s. We also estimate the subsidence rate by landscape classification of GIS data. As an initial result, significant subsidence with 2 cm/year in the area of deforested agricultural fields and settlement expansion around old settlements. In grassland landscapes, subsiding trends were also detected in areas with a history of artificial land use such as agricultural land and airports under warm and wet climates after the 1990s. These findings suggest the importance of the interaction between natural conditions and human activities in the degrading permafrost.
Mots clés : permafrost|hydroclimate|subsidence|InSAR|GIS
A105120YI