Nature-based approaches aim to protect coastal ecosystems, but implementing them in urbanized coastal areas is challenging. Biomimetic solutions attempt to imitate natural habitats like kelps, but their use for coastal protection is non-existent due to the complexity of the geometry and hydrodynamic behavior they mimic. This study focuses on wave dissipation by soft structures, aiming to develop an analytical model for determining new formulations of drag and inertia coefficients, enabling integration into traditional models with less prior parametrisation. The approach relies on the interaction between wave forcing and flexible structure displacement, considering parameters like pulsation, amplitude and phase shift. The new formulation of drag and inertia coefficients will depend on the structure geometry and flexibility, and hydrodynamic forcing. A comparison with existing literature and a dedicated field campaign are used to validate the model.
