Acoustic Scattering Models of Zooplankton

Effects of Frequency and Incidence Angle

return to Multifrequency Inverse Methods page (top of website)

How this webpage is organized:

Methods overview

List of plankton scattering models

Other scattering models


Methods overview

return to top of page

Distorted wave Born Approximation (DWBA) method for 'fluid-like' zooplankton

A) Find a good image of a zooplankter, preferably with scale information.

B) Digitize the outline of the animal.

C) Create the DWBA model using the outline of the animal and assuming circular symmetry about a centerline.

D) Calculate the complex backscattering amplitude fbs for any arbitrary frequency and incidence angle. sbs and TS can be determined from fbs.

E) If desired, calculate backscattering amplitude fbs over a large number (e.g. 10,000) of random angles for a range of frequencies. These results can be then used to calculate average backscattering vs. frequency.

F) Calculate backscattering vs. frequency for an equivalent volume sphere.

Warnings and Disclaimers

Detailed description of this approach, including suggested programs and mfiles.


Zooplankton Scattering Models

return to top of page

The following animals have been modeled using the method described above:

Copepods

Acartia tonsa

Calanus finmarchicus (Adult female)

Centropages typicus

Clausocalanus sp.

Corycaeus sp.

Euchaeta sp.

Halectinosoma sp.

Oithona sp.

Pseudocalanus spp.

 

Euphausiids

Euphausia superba

Other Decapods

Family Luciferidae

Lucifer faxoni

Other Scattering Models

These models were NOT done using the Distorted Wave Born Approximation

Fluid sphere models

Bubble model

Elastic sphere model

Sand model