CONSOLIDATION OF SEDIMENTS BY GLACIERS - RELATIONS BETWEEN SEDIMENT GEOTECHNICS, SOFT-BED GLACIER DYNAMICS AND SUBGLACIAL GROUNDWATER-FLOW

被引:84
作者
BOULTON, GS
DOBBIE, KE
机构
关键词
D O I
10.3189/S0022143000015690
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
A theory of subglacial consolidation is developed which shows how the meltwater flux beneath a glacier leaves a consolidation signature from which many important glacier-dynamic properties can be inferred. Conditions under which water is discharged through channels or in a thin film at the ice-bed interface or by ground-water flow are discussed, and it is concluded that glaciers flowing over aquifers of high transmissibility can induce deep circulation patterns quite different from non-glacial circulation. Examples of glacial pre-consolidation profiles in sediments from The Netherlands and England are used to illustrate how basal melting rates, subglacial ground-water flow patterns, ice overburden, basal shear stress, ice-surface profile and the amount of sediment removed by erosion can be inferred.
引用
收藏
页码:26 / 44
页数:19
相关论文
共 23 条
[1]   TILL BENEATH ICE STREAM-B .3. TILL DEFORMATION - EVIDENCE AND IMPLICATIONS [J].
ALLEY, RB ;
BLANKENSHIP, DD ;
BENTLEY, CR ;
ROONEY, ST .
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS, 1987, 92 (B9) :8921-8929
[2]  
[Anonymous], 1970, CAN GEOTECH J, DOI DOI 10.1139/T70-015
[3]  
BERNHARD H, 1963, TH HANNOVER GEOLOGIS, V1
[4]  
Bohvarsson G, 1955, JOKULL, V5, P1
[5]  
Boulton G. S., 1979, J GLACIOL, V24, P29, DOI DOI 10.3198/1979J0G24-90-29-43
[6]  
Boulton G. S., 1974, GEOG ANNALER A, V56, P135, DOI 10. 1080/04353676. 1974. 11879895
[7]  
Boulton G. S., 1977, BRIT QUATERNARY STUD
[8]   SEDIMENT DEFORMATION BENEATH GLACIERS - RHEOLOGY AND GEOLOGICAL CONSEQUENCES [J].
BOULTON, GS ;
HINDMARSH, RCA .
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS, 1987, 92 (B9) :9059-9082
[9]  
CATT JA, 1977, P YORKS GEOL SOC
[10]  
Dahl R., 1965, GEOGRAFISKA ANN, V47A, P83