1. Bathymetry Objective: To learn and distinguish some basic bathymetric (sea floor) features and contour them.

2. Bathymetry The sea floor is not flat

3. Methods Lead line – Lead line – –Old fashioned, lots of errors Sonar – Sonar – –Better, but still some errors Side Scan Sonar – Side Scan Sonar – –Best – multiple passes can create 3D images

4. GLORIA Sandy bottom off Massachusetts disturbed due to a Hurricane: ripples are beginning to reform

5. Submerged Chevette missing hood Small private helicopter crash site Fish

6. High Resolution Imaging

7. Notes on Procedure - Exercise 1 Be sure to hold down the landform when adding water or it will float up and move around. Be sure to hold down the landform when adding water or it will float up and move around. Draw lightly with the crayon, because every mark has to be erased at the end. Draw lightly with the crayon, because every mark has to be erased at the end. Wait until after you have marked each cm increment on the landform by adding water to draw the two dimensional contour using the dry erase marker and acetate sheet. Wait until after you have marked each cm increment on the landform by adding water to draw the two dimensional contour using the dry erase marker and acetate sheet. Label your contours and copy onto a sheet of paper using the overhead projector or another light piece of paper. Label your contours and copy onto a sheet of paper using the overhead projector or another light piece of paper.

8. Notes on Procedure – Exercise 2 Take all measurements except row 10 using the FINE chart Take all measurements except row 10 using the FINE chart Transfer your measurements onto the COARSE chart Transfer your measurements onto the COARSE chart Plot the coarse, then the fine in Excel (OR contour by hand) Plot the coarse, then the fine in Excel (OR contour by hand) Try changing the scale to see how the details change. Try changing the scale to see how the details change.

9. WITHOUT SCALE: IS IT A BASIN OR A GUYOUT?

31. Vertical Exaggeration

32. Practice