DOI: 10.5194/tc-11-1403-2017
Scopus记录号: 2-s2.0-85020847537
论文题名: Determining the terrain characteristics related to the surface expression of subsurface water pressurization in permafrost landscapes using susceptibility modelling
作者: Holloway J ; E ; , Rudy A ; C ; A ; , Lamoureux S ; F ; , Treitz P ; M
刊名: Cryosphere
ISSN: 19940416
出版年: 2017
卷: 11, 期: 3 起始页码: 1403
结束页码: 1415
语种: 英语
英文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75542
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Geography and Planning, Queen's University, Kingston, Canada
Recommended Citation:
Holloway J,E,, Rudy A,et al. Determining the terrain characteristics related to the surface expression of subsurface water pressurization in permafrost landscapes using susceptibility modelling[J]. Cryosphere,2017-01-01,11(3)