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A presentation by Dr. Keith Wilkinson at the DART community workshop on the 27th April 2011 on the current field methodology

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  1. 1. DART is a Science and Heritage project funded by the AHRC and EPSRC<br />DART methodology: from field to laboratory and monitoring<br />Keith Wilkinson<br />
  2. 2. Plan<br /><ul><li>The study areas and sites
  3. 3. Initial geophysical and borehole surveys (January-March 2011)
  4. 4. Excavation, sampling and monitoring station installation at Harnhill (April 2011)
  5. 5. Proposed investigation strategy of Diddington (May 2011)
  6. 6. Geoarchaeological/geotechnical analyses planned for monolith samples (June 2011 +)
  7. 7. Data to be collected by monitoring equipment
  8. 8. Future geophysical surveys
  9. 9. Vegetation and spectro-radiometer surveys
  10. 10. Questions</li></li></ul><li>The sites: Harnhill (Cherry Copse), Cirencester<br />Fluxgate gradiometer survey carried out of Cherry Copse, Harnhill in January 2011<br />
  11. 11. The sites: Harnhill (Quarry Field), Cirencester<br />Fluxgate gradiometer survey carried out of Quarry Field, Harnhill in January 2011<br />
  12. 12. The sites: Diddington, St Neots<br />
  13. 13. Fieldwork at Harnhill (April 2011)<br />Excavation of a boundary ditch at Cherry Copse<br />Trenches manually excavated and recorded prior to sampling and probe installation<br />
  14. 14. Fieldwork at Harnhill<br />Not everything went as planned! Pipes in ditch at Quarry Field<br />….. but samples were collected and probes installed at both Quarry Field and Cherry Copse<br />
  15. 15. Fieldwork at Harnhill (installation of monitoring equipment)<br />Inserting a probe into the (non-archaeological) part of the section in Quarry Field<br />The monitoring equipment under construction<br />
  16. 16. Planned excavation and probe installation strategyfor Diddington<br />Plan view<br />Machine excavated trench<br />Ditch<br />Cross section view<br />Present soil<br />c. 0.30m<br />‘Geology’<br />‘Geology’<br />Ditch fill<br />Step 1. Trench surveyed in and present soil removed by machine to the level of the underlying geology / top of the uppermost ditch fill. Artefacts are recovered.<br />
  17. 17. Strategyfor Diddington<br />Plan view<br />Cores inside ditch<br />Machine excavated trench<br />Cores outside ditch<br />Ditch<br />Hand excavate ditch fills<br />Cross section view<br />c. 1.00m<br />Present soil<br />c. 0.30m<br />‘Geology’<br />‘Geology’<br />Ditch fills<br />Step 2. Ditch fills are removed separately by hand until the ‘geology’ is reached. Artefacts recovered from each ditch fill are kept separate. Total station/GPS measurements are taken on the surface of the ‘geology’ to produce a surface model. Cores collected.<br />
  18. 18. Strategyfor Diddington<br />Plan view<br />Machine excavated trench<br />Ditch<br />Cross section view<br />c. 1.00m<br />Present soil<br />c. 0.30m<br />1.2m<br />Ditch fills<br />‘Geology’<br />Step 3. Machine excavate trench to 1.2m depth across its entire area.<br />
  19. 19. Strategyfor Diddington<br />Plan view<br />Hand and machine excavated trench<br />Ditch<br />Cross section view<br />Present soil<br />1.2m<br />‘Geology’<br />Monolith samples<br />Step 4. Draw and photograph both long sections. Collect geoarchaeological and geotechnical samples. Mark sample locations on section drawing and photograph in situ.<br />
  20. 20. Strategyfor Diddington<br />Plan view<br />Machine excavated trench<br />Ditch<br />Cross section view<br />Present soil<br />1.2m<br />Data logger, batteries etc.<br />‘Geology’<br />Sensors<br />Step 5. Install monitoring equipment (on opposite long section from the monolith samples)<br />Step 6. Machine backfill trench and compact<br />
  21. 21. Post fieldwork geoarchaeological and geotechnical studies (Birmingham and Winchester)<br />Monolith samples collected from the sites will be used for:<br /><ul><li>Magnetic susceptibility measurement
  22. 22. Moisture content measurement
  23. 23. Bulk density measurement
  24. 24. Atterberg limit tests
  25. 25. Grain size measurements
  26. 26. Organic carbon measurements
  27. 27. Geochemistry</li></ul>Cores collected at three monthly intervals will be used for:<br /><ul><li>Moisture content measurement</li></ul>The probe arrays and weather stations will provide sub-hourly :<br /><ul><li>Temperature (soil and air) measurements
  28. 28. Moisture contents and precipitation measurements</li></li></ul><li>Geophysical studies (Bradford)<br />The following geophysical methods will be applied at monthly intervals on a 15x15 or 20x20m grid around the sampling point at each site:<br /><ul><li>Ground penetrating radar
  29. 29. Magnetometry
  30. 30. Resistivity
  31. 31. Electrical Resistance Tomography</li></li></ul><li>Vegetation and spectro-radiometry (Leeds and Nottingham)<br />Six 10-20m long transects perpendicular to archaeological features will be studied at two-weekly to monthly intervals at each test site and the following measurements obtained :<br /><ul><li>Field spectro-radiometry
  32. 32. Laboratory spectro-radiometry of vegetation samples (3/metre of transect)
  33. 33. Leaf litter-soil ratio
  34. 34. Surface moisture
  35. 35. Vegetation coverage (via vertical photographs obtained from pole-mounted cameras)
  36. 36. Chlorophyll content
  37. 37. Plant height</li></li></ul><li>DART is a Science and Heritage project funded by the AHRC and EPSRC<br />Thank you for your attention.<br />Questions?<br />