The scattering problem of a surface-piercing inverted trapezoidal breakwater (SPTB) encircled by retrofit is numerically examined based on the assumptions of potential flow theory. The dual boundary element method is adopted to evaluate the hydrodynamic performance characteristics of the retrofitted SPTB breakwater. The scattering coefficients (i.e. wave transmission, wave reflection, energy loss), and force coefficients acting on the inner impermeable SPTB and outer retrofit are reported against relative water depth for various input values of breakwater properties and compared with a permeable retrofit. The SPTB with 10% porosity, spacing S/h = 0.25, width varied within (1.5 ≤ B/W ≤ W2 and depth d/h = 0.2 are suggested.

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