Miscellaneous numbers and symbols appear to float in the ocean as real and simulated waves rise in the background


Exposure Index Calculator

Kelson and collaborators have developed new metrics for assessing exposure of sites for aquaculture and ocean renewable energy

Kelson Marine is an active member of the ICES Working Group for Open Ocean Aquaculture (WGOOA). As a Working Group, we have convened farmers, engineers, regulators, and scientists to resolve the present ambiguity in the term "Offshore Aquaculture". The Working Group now recommends two distinct metrics to quantitatively describe aquaculture sites:

"Distance from shore": Sites are described by their distance from the coast.

"Exposure": Sites are further described with an exposure index that incorporates the design wave, current velocity, and depth of the site.

This distinction addresses a need to define the terminology to reduce ambiguity for characterizing aquaculture sites to:

  1. Promote a common understanding and avoid misuse of different classifications;
  2. Enable regulators to identify the characteristics of a marine site;
  3. Allow farmers to assess or quantitively compare sites for development;
  4. Equip developers and producers to identify operational parameters for the equipment and vessels; and
  5. Provide insurers and investors with better means to assess risk and premiums.

To help farmers, developers, regulators, investors, and members of the public apply these definitions, Kelson provides a calculator for the proposed exposure index definitions.

Map of Specific Exposure Energy in the German Bight


Lojek, O. Goseberg, N., Moe Fore, H., Dewhurst, T., Bölker, T, Heasman, K, Buck, B, Fredriksson, DW, Rickerich, S, 2023. A quantified approach to assessing hydrodynamic exposure of mariculture sites. Journal of the World Aquaculture Society. In preparation.

Buck, B. H., Bjelland, H., Bockus, A., Chambers, M., Costa-Pierce, B. A., Dewhurst, T., Ferreira, J., Føre, H. M., Fredriksson, D., Goseberg, N., Holmyard, J., Isbert, W., Krause, G., Markus, T., Papandroulakis, N., Sclodnick, T., Silkes, B., Strand, Å., Troell, M., Wieczorek, D., van den Burg, S., Heasman, K. 2023. Resolving the term ‘offshore aquaculture’ by decoupling ‘exposed’ and ‘distance from shore’ for managers and policy makers. Journal of the World Aquaculture Society. In preparation.

Enter values here...
Hydrodynamic Exposure Calculator
Exposure Velocity:m/s
Exposure Velocity at Reference Depth of 5m:m/s
Specific Exposure Energy:J/kg
Depth-integrated Energy Flux:kW/m
Structure-centered Depth-integrated Energy:kJ kg/m3
Structure-centered Drag to Buoyancy Ratio:
...or click on the map to use estimated ocean conditions for the selected location.

We'll be adding to this collection going forward.

Ideas? Let us know!

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The whole Kelson simulation-based design ecosystem is amazing! Questions that would have taken me months to resolve in academia I can now do in a matter of days

Zach Moscicki, PhD
Aquaculture Engineer since 2013

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