Abstract: Storm events exert significant regulatory effects on the geomorphic evolution, sediment dynamics, and ecological functions of tidal flat systems. Investigating the response mechanisms of intertidal zones under extreme meteorological conditions carries both scientific significance and socio-economic value. This study integrates in-situ hydrodynamic observations and airborne LiDAR topographic monitoring data from the Diaokou tidal flat in the Yellow River Delta, combining traditional point-based hydrodynamic measurements with UAV-based areal observations to systematically reveal the multi-scale regulatory mechanisms of storm events on tidal flat erosion-deposition processes. Key findings include: ① Short-term storm processes significantly enhance hydrodynamic intensity, with wave height increasing notably (3.38 times normal weather conditions) and wave-current coupled shear stress rising to 2.5-3 times baseline levels, triggering sediment resuspension and substantially elevating suspended sediment concentration. ② Storm events induce spatial differentiation of sediment characteristics and dramatic geomorphic changes, with maximum erosion thickness reaching 55.2 mm accompanied by sediment fining. The attenuation of erosion intensity during consecutive storms reveals the buffering effect of subsurface sediment consolidation, though extreme hydrodynamics continue to dominate sustained erosion. ③ Long-term monitoring indicates storm-induced erosion accounted for 19% of total erosion during the observation period, with erosion rates 8.6 times higher than normal conditions, demonstrating storm dominance in regional tidal flat erosion. ④ A 100-meter-wide intense erosion belt has formed along the high-tide ridge zone, with continuous high-tide line retreat indicating tidal flat degradation that may ultimately weaken coastal defense structures. Through multi-source data integration, this study elucidates the spatiotemporal differentiation mechanisms of storm impacts on tidal flat geomorphology, providing scientific basis for coastal protection.