DART: Fry progress so far 070711

Progress Update A 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

Results
Harnhill: Quarry Field

Harnhill: Quarry Field

Harnhill: Cherry Copse
Fluxgate
Gradiometer
Results

Harnhill: Cherry Copse

Preliminary Geophysics Diddington, Cambridgeshire

Results
Diddington 1

Interpretation
Diddington 1

Fluxgate Gradiometer Results
Diddington 2

Interpretation
Diddington 2

Diddington 3

Interpretation
Diddington 3

Diddington 4

Interpretation
Diddington 4

New Geophysics at Cherry Copse…

Cherry Copse

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)

Parallel traverses 0.5m
20x20m grid
In-phase (ppt) response to left
Apparent resistivity (ohm.m) to right
CMD MiniExplorer Quarry: Cirencester

Parallel traverses 0.5m
14x20m grid
In-phase (ppt) response to left
Apparent resistivity (ohm.m) to right
CMD MiniExplorer Cherry Copse: Cirencester

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DART: Fry progress so far 070711

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