This study investigates the flow velocity of extreme waves overtopping promenades. Using bubble image velocimetry (BIV), experiments were conducted in the scaled-down wave flume CIEMito at Universitat Politècnica de Catalunya. Post-processing of collected images determined flow velocities. The aim is to improve predictive models for wave overtopping onto structures with emergent toes found on sandy beaches, commonly used as promenades or waterfronts in urban coastal areas. Simulating extreme wave overflow in real random sea conditions, the NewWave theory correlates wave form and sea state attributes. Utilizing focused wave groups offers benefits including enhanced experiment replication, better measurement capabilities, and no wave absorption. One scenario from varying wave forces, tides, and coasts is presented-reflecting the Mediterranean Sea's micro-tidal environment with steep foreshores. The feasibility of non-intrusive methods like BIV for evaluating overflow flow velocity is explored, and initial findings are reported.
