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Bathymetry of the Sea Floor. “Mapping the Ocean Floor How and Why” . abyssal plain isolume (lines of equal light) bathymetry (bathymetric) isometric (lines of equal measure) continental shelf isotherm (lines of equal temperature) continental slope mid-ocean ridge

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Bathymetry of the Sea Floor


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bathymetry of the sea floor

Bathymetry of the Sea Floor

“Mapping the Ocean Floor

How and Why”

slide2
abyssal plain

isolume (lines of equal light)

bathymetry (bathymetric)

isometric (lines of equal measure)

continental shelf

isotherm (lines of equal temperature)

continental slope

mid-ocean ridge

contour lines (lines of equal height)

profile

guyot

seamount

isobar (lines of equal pressure)

topographic map

isobath (lines of equal depth)

trench

isohaline (lines of equal salinity)

Terminology

topography in the oceans
Topography in the Oceans?

“Topography can be used to identify and characterize deep water features of the seafloor to reveal upwelling-producing canyons, ridges, and escarpments. Digital data can be correlated with sea surface temperature and chlorophyll, and distribution of marine birds, mammals, and fishes/invertebrates.” – NOAA Bathymetry California

purposes for bathymetry
Purposes for Bathymetry
  • Determine the bottom depth and contour these depths for bottom analysis
  • Determine topographic features by looking from the top down and bottom geomorphology
  • Detail physical factors including water current, sediment transport, slope and areas for layering, etc…
  • Use values for comparisons of changing bottom features and movement of sediments
slide6

Application Alert

Chesapeake Bay

“The deepest parts of the Chesapeake Bay and its estuaries may represent a natural barrier to cross-channel sediment transport.  This map was developed as a starting point to assist in modeling sediment transport in the Bay”.

slide7
http://www.earthguide.ucsd.edu/earthguide/diagrams/sonar/sonar.htmlhttp://www.earthguide.ucsd.edu/earthguide/diagrams/sonar/sonar.html

Technologies have evolved to more accurately survey the ocean floor

slide8

Using echo sounding to determine depth

Measuring water depth: Echosounding

Test your knowledge

If a sound pulse takes 2 seconds to travel to the seafloor and return to the ship, what is the depth to the seafloor? (Use 1500 m/sec as the speed of sound).

slide15

By Nancy J. Hornewer and Marilyn E. Flynn

2008

USGS Project at Upper Lake Mary, Arizona