Rheology of cold firn and dynamics of a polythermal ice stream: studies on Colle Gnifetti and Jakobshavns Isbræ
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| Format: | Abschlussarbeit Buch |
| Sprache: | English |
| Veröffentlicht: |
Zürich
Versuchsanst. für Wasserbau, Hydrologie und Glaziologie
2000
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| Schriftenreihe: | Mitteilungen / Versuchsanstalt für Wasserbau, Hydrologie und Glaziologie der Eidgenössischen Technischen Hochschule Zürich
165 |
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| Online-Zugang: | Inhaltsverzeichnis |
| Beschreibung: | 212 S. Ill., graph. Darst. |
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Datensatz im Suchindex
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| adam_text | LO VAU VERSUCHSANSTALT FUR WASSERBAU, HYDROLOGIE UND GLAZIOLOGIE DER
EIDGENOSSISCHEN TECHNISCHEN HOCHSCHULE ZURICH MITTEILUNGEN 165 RHEOLOGY
OF COLD FIRN AND DYNAMICS OF A POLYTHERMAL ICE STREAM STUDIES ON COLLE
GNIFETTI AND JAKOBSHAVNS ISBRAE MARTIN PETER LUTHI ZURICH, 2000 INSTITUT
FDR WASSERBAU UNO WASSERWIRTSCHAFT TECHMISQHE UNIVBSITAT OA.I-STADT
PETERSENSTR. 13,. 64287 DARMSTADT TEL. 0 6151/16 2143 * FAX: 16 32 43
HERAUSGEBER: PROF. DR.-LNG. H.-E. MINOR BIBLIOTH CONTENTS CONTENTS 3
LIST OF FIGURES 9 LIST OF TABLES 13 LIST OF SYMBOLS 15 ABSTRACT 17
ZUSAINMENFASSUNG 19 I FLOW MODELING AND RHEOLOGICAL INVESTIGATIONS OF A
FIRN COVERED, COLD GLACIER: A CASE STUDY ON COLLE GNIFETTI 21 1
INTRODUCTION 23 2 FIELD OBSERVATIONS 25 2.1 SETTING 25 2.2 SURFACE
TOPOGRAPHY 26 2.2.1 SURFACE ELEVATION CHANGES 27 2.3 SURFACE VELOCITIES
27 2.4 ACCUMULATION 28 2.4.1 SHORT TERM BALANCE 29 2.4.2 LONG TERM
BALANCE 30 2.5 FIRN DENSITY 31 2.6 GLACIER THICKNESS 32 2.6.1 RADIO ECHO
SOUNDINGS 33 2.6.2 DATA PROCESSING 34 2.6.3 GLACIER BED 39 2.6.4
INTERNAL REFLECTIONS 39 3 2.6.5 ACCURACY OF THE RESULTS 41 2.7 FIRN
TEMPERATURES 41 2.7.1 THERMISTOR CALIBRATION 42 2.7.2 BOREHOLE
TEMPERATURES 42 2.7.3 TEMPERATURE GRADIENTS AND HEAT FLUXES 45 2.8
BOREHOLE CLOSURE 48 2.8.1 CALIPER CALIBRATION 48 2.8.2 BOREHOLE CLOSURE
MEASUREMENTS 48 2.8.3 DISCUSSION 50 2.9 BOREHOLE TILT MEASUREMENTS 52
2.9.1 TILT SENSORS 53 2.9.2 INCLINOMETER CALIBRATION 53 2.9.3 TILT ANGLE
MEASUREMENTS 55 3 RHEOLOGICAL PROPERTIES OF COLD FLRN 57 3.1 STAGES OF
DENSIFICATION 58 3.2 FIELD EQUATIONS 58 3.3 CONSTITUTIVE EQUATION FOR
ICE (GLEN S FLOW LAW) 59 3.3.1 FLOW LAW PARAMETERS 60 3.4 CONSTITUTIVE
EQUATIONS FOR FIRN 60 3.4.1 FORMULATION OF A RHEOLOGICAL EQUATION 61
3.4.2 FINAL STAGE MODELS 62 3.4.3 INTERMEDIATE STAGE MODELS 64 3.4.4
PROPERTIES OF THE FLOW LAWS 67 3.4.5 AIR BUBBLE CLOSE OFF 68 3.5 DENSITY
PROFILES 69 3.6 ANALYTICAL SOLUTIONS 70 3.6.1 CLOSURE OF A CYLINDRICAL
HOLE (U=L) 70 3.6.2 CLOSURE OF A SPHERICAL CAVITY (U=L) 71 3.6.3 GRAVITY
DRIVEN PLANE FLOW I/ 71 4 4 NUMERICAL MODELS 73 4.1 CHOICE OF A FINITE
ELEMENT CODE 73 4.2 IMPLEMENTATION IN FEMTOOL 74 4.3 IMPLEMENTATION IN
MARC 76 4.4 PIE- AND POST PROCESSING 76 4.5 ACCURACY OF THE FLOW MODELS
77 4.5.1 CLOSURE OF A. CYLINDRICAL HOLE 77 4.5.2 GRAVITY DRIVEN PLANE
FLOW 78 4.6 DENSIFICATION MODEL WITH MARC 78 4.6.1 PROBLEM COUPLING 79
4.6.2 ACCURACY OF MODELED DENSITY PROFILES 80 4.7 CLOSURE OF TWO
SPHERICAL CAVITIES IN THE GREENLAND ACCUMULATION AREA . 80 4.7.1
INTERPRETATION OF THE DATA 82 4.7.2 NUMERICAL MODEL 82 4.7.3 DISCUSSION
84 4.8 CLOSURE OF A BOREHOLE ON COLLE GNIFETTI 85 4.8.1 INTERPRETATION
WITH GLEN S FLOW LAW 86 4.8.2 NUMERICAL MODEL 86 5 FLOW MODELS OF COLLE
GNIFETTI 89 5.1 FLOWLINE MODEL 89 5.1.1 REFERENCE MODEL 91 5.1.2 SURFACE
VELOCITIES 92 5.1.3 DATING OF ICE CORES 93 5.1.4 DIAGNOSTIC QUANTITIES
94 5.1.5 INFLUENCE OF MODEL PARAMETERS 95 5.1.6 BOREHOLE DEFORMATION 99
5.1.7 FIRN DENSITY 100 5.2 THREE-DIMENSIONAL FLOW MODEL 104 5.2.1 MESH
GENERATION 104 5.2.2 BOUNDARY CONDITIONS 104 5.2.3 MODEL PARAMETERS 105
5 5.2.4 SURFACE VELOCITIES 106 5.2.5 FIRN DENSIFICATION MODEL 106 5.2.6
DATING OF ICE CORES 110 5.2.7 SOURCE REGIONS 112 5.2.8 DISCUSSION 114
5.3 HEAT FLOW MODEL 115 5.3.1 STEADY STATE MODEL 115 5.3.2 TRANSIENT
MODEL 117 5.3.3 EFFECTS OF LATENT HEAT 122 5.3.4 DISCUSSION 125 5.3.5
FUTURE EVOLUTION 125 6 CONCLUSIONS AND RECOMMENDATIONS FOR FURTHER
RESEARCH 133 6.1 MEASUREMENTS 133 6.2 FIRN RHEOLOGY 134 6.3 NUMERICAL
MODELS 134 6.4 RECOMMENDATIONS FOR FURTHER RESEARCH 135 II EXPERIMENTAL
AND NUMERICAL INVESTIGATION OF A POLY- THERMAL ICE STREAM: A CASE STUDY
AT JAKOBSHAVNS ISBRAE, WEST GREENLAND 137 7 INTRODUCTION 139 7.1 GOALS
OF THE STUDY 140 7.2 PREVIOUS WORK 141 8 FIELD OBSERVATIONS 143 8.1 THE
DRILL SITE 143 8.2 SURFACE VELOCITIES 146 8.3 DRILLING OPERATION 148
8.3.1 INSTRUMENTATION OF THE BOREHOLES 148 8.3.2 ICE THICKNESS AT THE
DRILL SITE 151 8.4 BOREHOLE WATER LEVELS ^ 152 6 8.4.1 BREAKTHROUGH
EVENTS 154 8.4.2 DISCUSSION 157 8.4.3 NATURE OF THE BASAL DRAINAGE
SYSTEM 161 8.5 ENGLACIAL TEMPERATURES 163 8.5.1 COMPARISON OF
TEMPERATURE PROFILES 163 8.5.2 THICKNESS OF THE TEMPERATE LAYER 164
8.5.3 MELTING POINT DEPRESSION 164 8.5.4 PHASE TRANSITION BOUNDARY (CTS)
167 9 MODEL CALCULATIONS 169 9.1 MODEL INPUT 169 9.2 MODELED
TEMPERATURES 170 9.3 WATER CONTENT OF THE ICE AT THE CTS 172 9.4
DISCUSSION 176 10 ICE DEFORMATION MEASUREMENTS 177 10.1 VERTICAL
DEFORMATION 177 10.1.1 CROSS-BOREHOLE CONDUCTIVITY MEASUREMENTS 179 10.2
BOREHOLE DEFORMATION MEASUREMENTS 180 10.2.1 INTERPRETATION IN TERMS OF
SIMPLE SHEAR 183 10.2.2 BASAL SLIDING 184 10.2.3 CONSEQUENCES FOR ICE
STREAM DYNAMICS 184 11 CONCLUSIONS 187 A RADAR MEASUREMENTS 189 B
ANALYTICAL SOLUTIONS 195 B.I CONTRACTION OF A SPHERICAL HOLE IN A POWER
LAW CREEPING MATERIAL . . .195 B.2 ANALYTICAL SOLUTIONS FOR A NEWTONIAN
MATERIAL 197 B.2.1 CLOSURE OF A CYLINDRICAL CAVITY 197 B.2.2 CLOSURE OF
A SPHERICAL CAVITY 198 C PHYSICAL PROPERTIES OF FIRN 199 BIBLIOGRAPHY
201 ACKNOWLEDGMENTS 211 7
|
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| spelling | Lüthi, Martin Peter Verfasser aut Rheology of cold firn and dynamics of a polythermal ice stream studies on Colle Gnifetti and Jakobshavns Isbræ Martin Peter Lüthi Zürich Versuchsanst. für Wasserbau, Hydrologie und Glaziologie 2000 212 S. Ill., graph. Darst. txt rdacontent n rdamedia nc rdacarrier Mitteilungen / Versuchsanstalt für Wasserbau, Hydrologie und Glaziologie der Eidgenössischen Technischen Hochschule Zürich 165 Zugl.: Zürich, Eidgenössische Techn. Hochsch., Diss., 2000 Eis (DE-588)4013994-3 gnd rswk-swf Rheologie (DE-588)4049828-1 gnd rswk-swf Grönland (DE-588)4022113-1 gnd rswk-swf (DE-588)4113937-9 Hochschulschrift gnd-content Grönland (DE-588)4022113-1 g Eis (DE-588)4013994-3 s Rheologie (DE-588)4049828-1 s DE-604 Versuchsanstalt für Wasserbau, Hydrologie und Glaziologie der Eidgenössischen Technischen Hochschule Zürich Mitteilungen 165 (DE-604)BV000019874 165 HEBIS Datenaustausch Darmstadt application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=017484900&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Lüthi, Martin Peter Rheology of cold firn and dynamics of a polythermal ice stream studies on Colle Gnifetti and Jakobshavns Isbræ Eis (DE-588)4013994-3 gnd Rheologie (DE-588)4049828-1 gnd |
| subject_GND | (DE-588)4013994-3 (DE-588)4049828-1 (DE-588)4022113-1 (DE-588)4113937-9 |
| title | Rheology of cold firn and dynamics of a polythermal ice stream studies on Colle Gnifetti and Jakobshavns Isbræ |
| title_auth | Rheology of cold firn and dynamics of a polythermal ice stream studies on Colle Gnifetti and Jakobshavns Isbræ |
| title_exact_search | Rheology of cold firn and dynamics of a polythermal ice stream studies on Colle Gnifetti and Jakobshavns Isbræ |
| title_full | Rheology of cold firn and dynamics of a polythermal ice stream studies on Colle Gnifetti and Jakobshavns Isbræ Martin Peter Lüthi |
| title_fullStr | Rheology of cold firn and dynamics of a polythermal ice stream studies on Colle Gnifetti and Jakobshavns Isbræ Martin Peter Lüthi |
| title_full_unstemmed | Rheology of cold firn and dynamics of a polythermal ice stream studies on Colle Gnifetti and Jakobshavns Isbræ Martin Peter Lüthi |
| title_short | Rheology of cold firn and dynamics of a polythermal ice stream |
| title_sort | rheology of cold firn and dynamics of a polythermal ice stream studies on colle gnifetti and jakobshavns isbræ |
| title_sub | studies on Colle Gnifetti and Jakobshavns Isbræ |
| topic | Eis (DE-588)4013994-3 gnd Rheologie (DE-588)4049828-1 gnd |
| topic_facet | Eis Rheologie Grönland Hochschulschrift |
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