| Summary: | application/pdf 東ユーラシアの永久凍土分布地域において、植生調査、活動層分布と永久凍土融解地形の測量、水文分析などの現地調査、衛星データ解析による地形変動や植生変化領域の解析、陸面過程・河川流出モデルの改良に基づく、凍土荒廃プロセスの地域特性と空間分布の評価を行った。特筆すべき成果として、植生構造の変遷が凍土（活動層）変動と密接に関係し、衛星・近接リモセンの併用で凍土融解による地形変化現象の詳細な構造を示すとともに、永久凍土の荒廃状況を凍土水文分析から初めて示したこと、凍土温度変化に地表の植生層と地下氷の効果を加味したモデルを開発し、その適用可能性を広げたことが上げられる。 This research project clarified spatial and temporal variations in degradation processes in permafrost region in eastern Eurasia, based on comprehensive analyses utilizing field work for vegetation-permafrost relationship, leveling on active layer and topographical change along permafrost degradation combining remote sensing technics, permafrost hydrological analyses and improved land-surface modeling. Notable results are summarized as follows. Spatial variation in active layer thickness was closely related with vegetation changes. Spatial structure of thermokarst development precisely mapped along with vegetation and active layer conditions. The permafrost degradation was also found in water-resource form geochemical composition in spring water. Based on these findings from field work, effect of snow depth, soil organic and moss layer in land surface model were sufficiently improved the performance to simulate permafrost temperature and active layer thickness in this region. 2014年度～2017年度科学研究費補助金(基盤研究(A))研究成果報告書 26242026 research report
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