Science Notes by Ahmet Arduc - Mapping a Shipwrecks Site


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Mapping a Shipwrecks Site
Science Notes by Ahmet Arduc -

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Science Notes by Ahmet Arduc - Mapping a Shipwrecks Site

  1. 1. If Shipwrecks Could Talk 1. Planet Ocean 2. Mapping the Ocean Floor 3. Historic Shipping Routes 4. Sink or Float? 5. Navigating with a Compass 6. Navigating with a Quadrant 7. Water Depth and Pressure 8. Working Under Pressure 9. Interpreting Artifacts 10. Mapping a Shipwreck Site by Ahmet Arduc –
  2. 2. Q: What happened to the beans as you continued to slosh the water around in the tube? Did they stay in one pile at the bottom of the tube? Mapping a Shipwrecks Site A: The beans scattered across the bottom of the tub. Shipwreck sites often cover large areas. Surface and underwater currents and rough seas can carry shipwreck materials over great distances.
  3. 3. crime scene investigation
  4. 4. Q: What is Pre-disturbance survey? A: The first task of a marine archaeologist after locating a shipwreck site is to document the site as it appears in its untouched state. This documentation process is called a pre-disturbance survey. A pre-disturbance survey records the surface appearance of the site before it is excavated. During the survey a map is made of the site, showing the number, size, location, and orientation of the artifacts as they are found.
  5. 5. Archaeology is the study of past cultures through the • Collection, • Classification • Interpretation of the material remains of those cultures. Odyssey Marine Exploration who is involved in deep-ocean shipwreck exploration announced today that it has completed the pre-disturbance archaeological survey and preliminary excavation of a Colonial period shipwreck site code-named “Black Swan” in an undisclosed location in the Atlantic Ocean.
  6. 6. A pre-disturbance survey involves recording the • Type, • Number • Size of the artifacts found at the site, mapping their • Location • Orientation • Noting any other characteristics that may be important to the investigation and which may be lost once excavation begins.
  7. 7. Q: How big an area is represented by the entire map? Q: What can be found at the location (9, 8), (10, 3), (5, 2)?
  8. 8. Q: What is ballast? A: Ballast is heavy material placed in the bottom of a ship to make the ship ride lower in the water and thus make it more stable. In 17th century wooden sailing vessels, rocks were often used for ballast when the ship was not fully loaded with cargo. Ballast water loading
  9. 9. Cross section of a typical galleon design. Note the two gun decks, supplies stored in the lowest hold and the ballast stones that were critical to the ships stability and one of the key ways to identify sunken shipwrecks to this very day.