Tree-rings, timbers and trees:a dendrochronological survey on the Doel shipsKristof HanecaApril 25, 2013
99,9 % oakWood identificationship timbers: oak (Quercus robur/Q. petraea)1 treenail: beech (Fagus sylvatica)fenders:alder ...
Tree-rings, timbers & trees• 129 new +18 RING• incl. 6 repairs147 tree-ringseries• 63 dated• 38 undated101 timbers• 52 dat...
All dated timbers, DOEL 1
hull planks vs. framing timbers, DOEL 1
Repairs: average of 3, DOEL 1
Felling date Doel 1: 1325/26 AD1325 AD
Date of repair (along Southern Baltic coast)End date 1320No sapwood !Sapwood estimate 7-26 (94,5% CI)Average n°: 19Felling...
Provenance DOEL 2Felling date (95,4% CI): between 1326 and 1340 AD
DOEL 1, strakes A-Dsymmetrical layout(same colour = planks from the same tree)
ConclusionsUnique dataset> 162 tree-ring series from 2 shipsDating and provenance (Doel 1 vs. Doel 2)More or less contempo...
Doel 3: dendro DIYTarget timbers with sapwood or barkBoth framing timbers and planks~20 samples (min!)Concentrate on repai...
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Tree-rings, timbers and trees: a dendrochronological survey on the Doel ships

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Tree-rings, timbers and trees: a dendrochronological survey on the Doel ships

  1. 1. Tree-rings, timbers and trees:a dendrochronological survey on the Doel shipsKristof HanecaApril 25, 2013
  2. 2. 99,9 % oakWood identificationship timbers: oak (Quercus robur/Q. petraea)1 treenail: beech (Fagus sylvatica)fenders:alder (Alnus sp.)“the softer hardwood”alder European oakDensity 12% (kg/m³) 490-640 500-970Density green (kg/m³) 680-1000 900-1200Hardness (Janka, N/mm³) 33-38 50-66
  3. 3. Tree-rings, timbers & trees• 129 new +18 RING• incl. 6 repairs147 tree-ringseries• 63 dated• 38 undated101 timbers• 52 dated• 38 undated90 trees• 4 dated• 2 undated6 repairstBP ~ 10PV% ~ 85DOEL 1
  4. 4. All dated timbers, DOEL 1
  5. 5. hull planks vs. framing timbers, DOEL 1
  6. 6. Repairs: average of 3, DOEL 1
  7. 7. Felling date Doel 1: 1325/26 AD1325 AD
  8. 8. Date of repair (along Southern Baltic coast)End date 1320No sapwood !Sapwood estimate 7-26 (94,5% CI)Average n°: 19Felling date certainly after 1327 ADAssuming HW/SW: 1339 AD> 13 years after construction
  9. 9. Provenance DOEL 2Felling date (95,4% CI): between 1326 and 1340 AD
  10. 10. DOEL 1, strakes A-Dsymmetrical layout(same colour = planks from the same tree)
  11. 11. ConclusionsUnique dataset> 162 tree-ring series from 2 shipsDating and provenance (Doel 1 vs. Doel 2)More or less contemporaneousDifferent provenanceRepairs Doel 1 same origin as ship timbers Doel 2Repairs!Provide most informationDate of repairLocation of repair <> construction siteDoel 1 >13 years “in action”…Wood conversion and shipbuildingSymmetrical layout of bottom strakesKeelplank: stockpile or ponding?
  12. 12. Doel 3: dendro DIYTarget timbers with sapwood or barkBoth framing timbers and planks~20 samples (min!)Concentrate on repairsResearch questionsWood conversionSymmetrical layout?Also analyse timbers with short TRSStockpile or watering of some crucial structural timbers?

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