This study investigates wave-structure interactions through laboratory experiments aimed at improving the hydraulic performance of seawalls under varying wave conditions. Focusing on wave overtopping, run-up, and rundown, the research compares two existing seawall designs—vertical and curved—with four geometrically enhanced conceptual models: stepped, rectangular block, cube block, and curved block seawalls. Physical model tests were conducted in a 25-meter wave flume using regular waves under both submerged and non-submerged conditions, with structures scaled at 1:40 using Froude similarity. Wave overtopping was quantified using an overtopping tank, while run-up and rundown were analyzed from high-speed video footage. 

 The study is expected to generate site-specific experimental data that will guide the development and evaluation of optimized seawall geometries for coastal flood control. Through wave flume testing, the experiment will produce quantitative measurements of wave run-up, rundown, and overtopping for both proposed and existing seawall designs under varying wave and water level conditions. These results will allow for a direct comparison of design performance, highlighting which geometries are most effective in reducing overtopping and dissipating wave energy. The findings will serve as a technical basis for identifying the most suitable structure for normal and extreme wave events in Laoag City and similar coastal settings. Furthermore, the outputs will contribute to the refinement of the prototype design for future field performance testing, and provide empirical data that can support numerical modeling, engineering design, and long-term coastal protection planning.