DOI: 10.5194/tc-8-137-2014
Scopus记录号: 2-s2.0-84893073532
论文题名: A double continuum hydrological model for glacier applications
作者: De Fleurian B ; , Gagliardini O ; , Zwinger T ; , Durand G ; , Le Meur E ; , Mair D ; , Räback P
刊名: Cryosphere
ISSN: 19940416
出版年: 2014
卷: 8, 期: 1 起始页码: 137
结束页码: 153
语种: 英语
英文关键词: drainage
; finite element method
; friction
; glacier dynamics
; hydrological modeling
; pressure effect
; spatiotemporal analysis
; velocity
英文摘要: The flow of glaciers and ice streams is strongly influenced by the presence of water at the interface between ice and bed. In this paper, a hydrological model evaluating the subglacial water pressure is developed with the final aim of estimating the sliding velocities of glaciers. The global model fully couples the subglacial hydrology and the ice dynamics through a water-dependent friction law. The hydrological part of the model follows a double continuum approach which relies on the use of porous layers to compute water heads in inefficient and efficient drainage systems. This method has the advantage of a relatively low computational cost that would allow its application to large ice bodies such as Greenland or Antarctica ice streams. The hydrological model has been implemented in the finite element code Elmer/Ice, which simultaneously computes the ice flow. Herein, we present an application to the Haut Glacier d'Arolla for which we have a large number of observations, making it well suited to the purpose of validating both the hydrology and ice flow model components. The selection of hydrological, under-determined parameters from a wide range of values is guided by comparison of the model results with available glacier observations. Once this selection has been performed, the coupling between subglacial hydrology and ice dynamics is undertaken throughout a melt season. Results indicate that this new modelling approach for subglacial hydrology is able to reproduce the broad temporal and spatial patterns of the observed subglacial hydrological system. Furthermore, the coupling with the ice dynamics shows good agreement with the observed spring speed-up. © Author(s) 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74898
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: CNRS, LGGE, UMR5183, 38041 Grenoble, France; Univ. Grenoble Alpes, LGGE, 38041 Grenoble, France; Institut Universitaire de France, Paris, France; CSC, IT Center for Science Ltd, Espoo, Finland; Department of Geography and Environment, University of Aberdeen, Aberdeen, United Kingdom
Recommended Citation:
De Fleurian B,, Gagliardini O,, Zwinger T,et al. A double continuum hydrological model for glacier applications[J]. Cryosphere,2014-01-01,8(1)