Helicopter-borne ground penetrating radar measurements on the Sørsdal Glacier 2017-2018
Ground penetrating radar (GPR) is an active geophysical technique that uses high frequency radio waves to map the subsurface. The basic principle of GPR measurements is the transition of electromagnetic pulses of suitable frequency down into the ground through a transmitting antenna, and to detect t...
| Other Authors: | , , , |
|---|---|
| Format: | Dataset |
| Language: | unknown |
| Published: |
Australian Antarctic Data Centre
|
| Subjects: | |
| Online Access: | https://researchdata.ands.org.au/helicopter-borne-ground-2017-2018/1449641 https://doi.org/10.26179/5e7adfa5a8859 https://data.aad.gov.au/metadata/records/AAS_4342_HeloGPR_2017-2018 http://nla.gov.au/nla.party-617536 |
| Summary: | Ground penetrating radar (GPR) is an active geophysical technique that uses high frequency radio waves to map the subsurface. The basic principle of GPR measurements is the transition of electromagnetic pulses of suitable frequency down into the ground through a transmitting antenna, and to detect the reflected energy as a function of time, amplitude and phase from any subsurface targets through a receiver antenna. If the electromagnetic travel velocity of the subsurface is known, time can be converted to depth. Wave reflections are generated from the boundaries of materials of different electromagnetic properties. The large contrast between the electromagnetic properties of rock, ice, water, and some sediments makes GPR a particularly effective method for mapping in frozen environments. A Måla ProEx radar system with a shielded antenna, centre frequency 100 MHz, connected to a handheld Garmin GPS. The antenna was housed in wooden box, slung on a longline, 15 metres long, from the helicopter cargo hook. Two surveys were carried out on the Sørsdal Glacier with the aim of mapping englacial meltwater channels. Outer survey bounds -68.66, 78.302 -68.65, 78.532 -68.72, 78.544 -68.73, 78.313 Survey 1 - 21/12/2017 - 11 parallel survey lines 8 km long and 2 cross profiles 3.2 km long Survey 2 - 22/01/2018 - 12 survey lines 1.3 km long |
|---|