WAVE ATTENUATION EFFECTS BY MANGROVES USING THREE-DIMENSIONAL NUMERICAL CALCULATIONS

Mangroves significantly attenuate tsunami wave heights, and recent studies have explored this using both experiments and numerical simulations. Fluid behavior in mangrove forests is highly three-dimensional and requires high computational cost for numerical analysis. Therefore, this study employs a simplified modeling method using the Dupuit-Forchheimer law, which reproduces attenuation effects with low computational cost. Results show that wave height attenuation was consistent with experiments even at coarse grid resolutions (2–4 times the trunk diameter). Local scale calculations confirmed that wider mangrove forests and higher resistance coefficients reduce transmissivity, aligning with experimental and prior research trends. This approach demonstrated potential for evaluating mangrove- based disaster mitigation.