Looking through drumlins: testing the application of ground penetrating radar

Matteo Spagnolo, Edward C. King, David W. Ashmore, Brice R. Rea, Jeremy C. Ely, Chris D. Clark

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

10 Dyfyniadau (Scopus)
119 Wedi eu Llwytho i Lawr (Pure)

Crynodeb

Ground-penetrating radar (GPR) is becoming a commonly applied technique in
geomorphology. However, its use in the study of subglacial bedforms has yet to be fully explored and exploited. This paper presents the results of a GPR feasibility study conducted on a drumlinized terrain in Cumbria, UK, where five drumlins were investigated using multiple radar antenna frequencies. The site was selected for the presence of nearby bedrock outcrops, suggesting a shallow
drumlinized diamict–bedrock contact and a permeable lithology. Despite the clayey sediment and unfavourable weather conditions, a considerable penetration depth of ~12 m was achieved when using a 50 MHz antenna, with a separation of 1 m, trace spacing of 1 m and 128-fold vertical stack. Results
indicate that the drumlinized diamict is in direct erosional contact with the bedrock. While the internal drumlin geometry is generally chaotic on the stoss side, evidence of layering dipping downflow at an angle greater than the drumlin surface profile was found on the lee side. The inter-drumlin areas comprise ~4 m of infill sediment that masks part of the original drumlin profile. Overall, this study indicates that GPR can be deployed successfully in the study of glacial bedform sedimentary architecture
Iaith wreiddiolSaesneg
Tudalennau (o-i)1126-1134
CyfnodolynJournal of Glaciology
Cyfrol60
Rhif cyhoeddi224
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - 26 Awst 2014

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