Bent cylinder modal series (BCMS) solution

Computes backscatter from straight and uniformly bent finite cylinders by combining the exact finite-cylinder modal-series kernel with the equivalent coherent-length correction used for uniformly bent cylinders near normal incidence.

Usage

This model is accessed via:


target_strength(
  ...,
  model = "BCMS",
  boundary,
  sound_speed_sw,
  density_sw,
  m_limit
)

Arguments

boundary: Boundary condition at the cylinder surface. One of "fixed_rigid", "pressure_release", "liquid_filled", or "gas_filled".
sound_speed_sw: Seawater sound speed (\(m~s^{-1}\)).
density_sw: Seawater density (\(kg~m^{-3}\)).
m_limit: Optional model truncation limit used to cap the number of retained cylindrical modes.

References

Stanton, T.K. (1988). Sound scattering by cylinders of finite length. I. Fluid cylinders. The Journal of the Acoustical Society of America, 83: 55-63.

Stanton, T.K. (1989). Sound scattering by cylinders of finite length. III. Deformed cylinders. The Journal of the Acoustical Society of America, 85: 232-237.

Stanton, T.K., Chu, D., Wiebe, P.H., and Clay, C.S. (1993). Average echoes from randomly oriented random-length finite cylinders: zooplankton models. The Journal of the Acoustical Society of America, 94: 3463-3472.