Activity #3 - Bathymetric Mapping
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1 Activity #3 - Bathymetric Mapping Concepts # 1, 2 #1 The floor of the ocean is composed of hills, plains, ridges, trenches, and seamounts. #2 Oceanographers have developed methods for mapping the ocean floor, illustrating what cannot be seen. Objective: Students will draw contour lines based on NOAA soundings on a nautical chart. They will color the contours and glue label tags for topographic features. Materials: nautical chart 1 with soundings in fathoms (1 fm = 6 ft) for student activity nautical chart 2 with contour lines (for reference) nautical chart 3 with shaded contours (for reference) nautical chart 4 with topographic labels (for reference) nautical chart 5 - actual NOAA chart of same region label tags for topographic features scissors colored pencils, water colors or crayon pencil bonus activity map (see last evaluation item) Procedures: 1. On nautical chart 1 use a PENCIL to draw contour lines for the following depths (in fathoms): 50, 250, 500, 750, 1000, 1250, 1500, 1750 and Draw the 50 fathom line by keeping all the soundings less than 50 on one side of your line and all the soundings larger than 50 on the other side. Do the same thing at 250 fathoms and every 250 fathoms as you go deeper. Remember that contour lines do not cross each other. When done your teacher may want you to check your contours with chart After you have finished drawing your contour lines, color in each contour by using light blue for the first depth contour (around the land and islands), then darker and darker blue colors, until you end up using black for the deepest contour (bottom left corner). When done your teacher may want you to check your contours with chart Finally, cut out the label tags for the topographic features you have drawn and colored in. Glue them in place to identify the basins, banks and submarine canyons on your chart. When done your teacher may want you to check your contours with chart 4. Seafloor & Continental Drift - page 16
2 Evaluation:! How might the geologic formations shown on your map have been formed? (along fault lines; some crustal blocks sink to form basins, other are uplifted to form mountains, islands or banks.)! Where is the continental shelf? slope? abyssal plains? (The continental shelf here is not flat, it is interrupted by islands, basins and banks. The shelf runs to the Patton Escarpement, which is the continental slope. The abyssal plains are in the lower left corner).! Suppose you are the captain of a fishing boat. You hear a report of good fishing near San Miguel Island and sail to the area. GIve at least two reasons for studying a nautical chart with bathymetric information before fishing? (To keep from running aground and to keep from getting your fishing gear caught on the bottom.)! How is the map you drew similar to the nautical chart drawn by professionals? (soundings are the same; some contour lines are barely visible beneath the other data)! How can you account for the differences? (nautical charts show other important navigational information such as the shipping lanes for large commercial vessels, the LORAN grid for older navigational units, the details of every lighthouse, buoy and other markers, areas for military testing, dumping and other information)! Students complete map 3 for homework. If the map is done correctly a dolphin fish will appear. Seafloor & Continental Drift - page 17
3 Activity #3 - Bathymetric Mapping Label Tags for Topographic Features Cut out each tag as close to the lettering as you can. Try NOT to leave too much white space around the edges of the label. Santa Barbara Santa Cruz Santa Rosa - Cortes Ridge Patton Escarpement Tanner Tanner Bank Santa Monica San Pedro Lasuen Bank Osborn Bank Santa Catalina San Nicolas San Fernando Los Angeles Sant Cruz Canyon Santa Monica Canyon Redondo Canyon Seafloor & Continental Drift - page 18
4 Seafloor & Continental Drift - page 19
5 Seafloor & Continental Drift - page 20
6 Seafloor & Continental Drift - page 21
7 Seafloor & Continental Drift - page 22
8 Activity #3 - Bathymetric Mapping Chart #5 - Section of NOAA Chart Seafloor & Continental Drift - page 23
9 Activity #3 - Bathymetric Mapping Bonus Activity Map Seafloor & Continental Drift - page 24
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