Hydrographic Applications Flashcards
Why is bottom fishing bad?
Causes physical disturbances
Makes it difficult for habitats to recover
Why is mapping benthic habitats important?
Biological diversity Seafloor integrity Habitat condition Physical damage Mapping the extent of habitats Classification / enumeration of species
What are invasive mapping approaches?
Non technical
Grabs
Dredging
Bottom trawls
What are non invasive mapping approaches?
Specialist skills required
Acoustics
Imagery
How are grabs used?
Used to collect samples of sediment and marine species beneath the surface of the seabed
How are trawls used?
Collect samples on or near the sea bed
How are multibeams used?
Measure water depth and seabed morphology
How are sidescan sonars used?
To measure sediment types
How are sub bottom measurers used?
To measure shallow geology and sedimentary structure
What are some of the challenges?
Qualitative vs Quantitative
Technical vs non technical
Natural vs physical sciences
