School of ComputingFaculty of Engineering
Progress UpdateA quick look at the DART project so far, the preliminary geophysics and the FlashRes64
Robert Fry
Division of Archaeological, Geographical and Environmental Science
PhD
• Research into geophysical seasonality has begun
• Preliminary testing of the FlashRes64 ERI instrument
• Development of an extraction program in Python begun
DART
• Sites for investigation have been found
•Preliminary geophysical (Fluxgate Gradiometer) surveys
• Excavation of sites and installation of TDR probes (Cirencester)
• Testing of CMD EM with possible addition onto the geophysical methodology
Since the last meeting….
Preliminary Geophysics
Harnhill, Cirencester
Fluxgate Gradiometer
Results
Harnhill: Rathill
Interpretation
Harnhill: Rathill
Fluxgate Gradiometer
Results
Harnhill: Quarry Field
Harnhill: Quarry Field
Harnhill: Cherry Copse
Fluxgate
Gradiometer
Results
Harnhill: Cherry Copse
Preliminary GeophysicsDiddington, Cambridgeshire
Fluxgate Gradiometer
Results
Diddington 1
Interpretation
Diddington 1
Fluxgate Gradiometer Results
Diddington 2
Interpretation
Diddington 2
Fluxgate Gradiometer Results
Diddington 3
Interpretation
Diddington 3
Fluxgate Gradiometer Results
Diddington 4
Interpretation
Diddington 4
New Geophysics at Cherry Copse…
Cherry Copse
Quarry Field
Quarry Field
TDR installed at Cirencester (Quarry Field)
FlashRes64• New technology – usually a geological/hydrological investigation.
•C.15,000 measurements in 15 minutes
• C.60,000 measurements in 50 minutes
• Production of a ‘small-spacing rig’ for archaeological problems
• Production of a lab rig for specific testing (MSc Dissertation research)
FlashRes64 – Rough Guide
Long surveys
Temple Newsam - Leeds
• 1m probe separation
Archaeological Problems: Broughton
Ditch
20cm spacing = 12.6m transect
Ditch at top = C.1.4m wide
Archaeological Problems: Broughton
Ditch
Quarry Field, Cirencester
• 20cm probe spacing (12.6m per survey)• Roll-on survey (two surveys per traverse)• Traverses 2m apart
Area of overlap
1
4
5
8
9
2
3
6
7
10
Survey no. Traverse no.1
2
3
4
5
Quarry Field: Cirencester
2D profiles
Surveys 1+2
(Traverse 1)
Surveys 3+4
(Traverse 2)
Surveys 5+6
(Traverse 3)
Surveys 7+8
(Traverse 4)
Surveys 9+10
(Traverse 5)
3D depth slices
Archaeological application: FlashRes Extractor program• Written in Python – very much still in progress
•Claims: 0.5m, 1m, 1.8m depth ranges
• Intercoil spacing: 0.32m, 0.71m, 1.18m
• Built in EM inversion
• Apparent conductivity (resistivity) as well as in-phase response
•Tests in Bradford Amphitheatre, and Harnhill, Cirencester
CMD MiniExplorer
• Samples collected 0.5s
• Zig-zag traverses 0.5m
• 20x20m grid
• In-phase response to left
• Apparent resistivity to right
CMD MiniExplorer Bradford
Service pipe (Photo: Andy Parkyn)
• Samples collected 0.5s
• Parallel traverses 0.5m
• 20x20m grid
• In-phase (ppt) response to left
• Apparent resistivity (ohm.m) to right
CMD MiniExplorer Quarry: Cirencester
• Samples collected 0.5s
• Parallel traverses 0.5m
• 14x20m grid
• In-phase (ppt) response to left
• Apparent resistivity (ohm.m) to right
CMD MiniExplorerCherry Copse: Cirencester
‘Publications’
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