气候变化领域集成服务门户(CCPortal): Determining the terrain characteristics related to the surface expression of subsurface water pressurization in permafrost landscapes using susceptibility modelling

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DOI	10.5194/tc-11-1403-2017
	Determining the terrain characteristics related to the surface expression of subsurface water pressurization in permafrost landscapes using susceptibility modelling
	Holloway J.E.; Rudy A.C.A.; Lamoureux S.F.; Treitz P.M.
发表日期	2017
ISSN	19940416
卷号	11 期号:3
英文摘要	Warming of the Arctic in recent years has led to changes in the active layer and uppermost permafrost. In particular, thick active layer formation results in more frequent thaw of the ice-rich transient layer. This addition of moisture, as well as infiltration from late season precipitation, results in high pore-water pressures (PWPs) at the base of the active layer and can potentially result in landscape degradation. To predict areas that have the potential for subsurface pressurization, we use susceptibility maps generated using a generalized additive model (GAM). As model response variables, we used active layer detachments (ALDs) and mud ejections (MEs), both formed by high PWP conditions at the Cape Bounty Arctic Watershed Observatory, Melville Island, Canada. As explanatory variables, we used the terrain characteristics elevation, slope, distance to water, topographic position index (TPI), potential incoming solar radiation (PISR), distance to water, normalized difference vegetation index (NDVI; ME model only), geology, and topographic wetness index (TWI). ALDs and MEs were accurately modelled in terms of susceptibility to disturbance across the study area. The susceptibility models demonstrate that ALDs are most probable on hill slopes with gradual to steep slopes and relatively low PISR, whereas MEs are associated with higher elevation areas, lower slope angles, and areas relatively far from water. Based on these results, this method identifies areas that may be sensitive to high PWPs and helps improve our understanding of geomorphic sensitivity to permafrost degradation. © Author(s) 2017.
学科领域	active layer; environmental modeling; hillslope; infiltration; land degradation; NDVI; permafrost; porewater; pressure effect; subsurface flow; terrain; watershed; Arctic; Canada; Cape Bounty; Melville Island [Queen Elizabeth Islands]; Queen Elizabeth Islands
语种	英语
scopus关键词	active layer; environmental modeling; hillslope; infiltration; land degradation; NDVI; permafrost; porewater; pressure effect; subsurface flow; terrain; watershed; Arctic; Canada; Cape Bounty; Melville Island [Queen Elizabeth Islands]; Queen Elizabeth Islands
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119384
作者单位	Department of Geography and Planning, Queen's University, Kingston, ON K7L 3N6, Canada
推荐引用方式 GB/T 7714	Holloway J.E.,Rudy A.C.A.,Lamoureux S.F.,et al. Determining the terrain characteristics related to the surface expression of subsurface water pressurization in permafrost landscapes using susceptibility modelling[J],2017,11(3).
APA	Holloway J.E.,Rudy A.C.A.,Lamoureux S.F.,&Treitz P.M..(2017).Determining the terrain characteristics related to the surface expression of subsurface water pressurization in permafrost landscapes using susceptibility modelling.Cryosphere,11(3).
MLA	Holloway J.E.,et al."Determining the terrain characteristics related to the surface expression of subsurface water pressurization in permafrost landscapes using susceptibility modelling".Cryosphere 11.3(2017).