Basal perturbations under ice streams: form drag and surface expression

被引:47
作者
Schoof, C [1 ]
机构
[1] Univ Oxford, Inst Math, Oxford OX1 3LB, England
关键词
D O I
10.3189/172756502781831269
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
Classical sliding theories consider ice sliding over obstacles which are much shorter than the thickness of overlying ice. Here we present a theory which considers "form drag" generated under ice streams by large obstacles such as subglacial bedforms, which may have lengths comparable to ice thickness. We also investigate how perturbations at the surface of an ice stream can be generated by such bedforms, and develop a mathematical framework for separating the effects of such local (kilometre-scale) variations in ice flow from the bulk flow of the ice stream.
引用
收藏
页码:407 / 416
页数:10
相关论文
共 22 条
[12]  
Holmes M, 1995, Introduction to Perturbation Methods
[13]   1ST-ORDER STRESSES AND DEFORMATIONS IN GLACIERS AND ICE SHEETS [J].
HUTTER, K ;
LEGERER, F ;
SPRING, U .
JOURNAL OF GLACIOLOGY, 1981, 27 (96) :227-270
[14]  
Hutter K., 1983, THEORETICAL GLACIOLO, DOI DOI 10.1115/1.3167761
[15]   STRESS-GRADIENT COUPLING IN GLACIER FLOW .1. LONGITUDINAL AVERAGING OF THE INFLUENCE OF ICE THICKNESS AND SURFACE SLOPE [J].
KAMB, B ;
ECHELMEYER, KA .
JOURNAL OF GLACIOLOGY, 1986, 32 (111) :267-284
[16]   Steady plane isothermal linearly viscous flow of ice sheets on beds with moderate-slope topography [J].
Morland, LW .
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 2000, 456 (1999) :1711-1739
[17]  
MORLAND LW, 1976, J GLACIOL, V17, P447, DOI DOI 10.3189/S0022143000013733
[18]  
MORLAND LW, 1976, J GLACIOL, V17, P463
[19]   A CALCULATION ON SLIDING OF ICE OVER A WAVY SURFACE USING A NEWTONIAN VISCOUS APPROXIMATION [J].
NYE, JF .
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1969, 311 (1506) :445-&
[20]  
PATERSON WSB, 1994, PHYSICS GLACIERS