Abstract: Storm events can exert significant regulatory effects on the geomorphic evolution, sediment dynamics and ecological functions of tidal flat systems. It is of important scientific value and socio-economic significance to explore the response mechanisms of intertidal zones under extreme meteorological conditions. Based on the in-situ hydro-sediment dynamic observations and the airborne LiDAR topographic monitoring data obtained from the Diaokou tidal flat in the Yellow River Delta and by intigrating the traditional point-based hydro-sediment dynamic measurements with the UAV area-based observations, the multi-scale regulatory mechanisms of storm events on the scouring-silting processes in the tidal flat are revealed systematically. It is found that: ① Short-term storm events can significantly enhance the hydrodynamic intensity, with the increase of wave height being notably, which is 3.38 times that under 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 can induce the spatial differentiation of sediment characteristics and the dramatic changes in geomorphology of the tidal flat. In the present study, for instance, the maximum erosion thickness of the tidal flat surface is found reaching to 5.52 cm and the sediment on the flat surface exhibits a refinement phenomenon. During consecutive storms the erosion intensity of the tidal flat trends to decrease, revealing that the consolidation of subsurface sediments may play a buffering roll to the subsequent erosion. But, the extreme hydrodynamics during the storms still dominates the sustained erosion; ③ Long-term monitoring data indicate that the storm-induced erosion can account for 19% of the total erosion throughout the monitoring period, with the erosion rate being 8.6 times higher than that under the normal conditions, reflecting that the tidal flat erosion in the study area may be driven mainly by the storm events; ④ An about 100-meter-wide intense erosion belt has formed along the high-tide ridge zone. The high-tide line retreats continuously, indicating that the tidal flat trends to degradate. This may ultimately lead to a reduction in the protective efficacy of seawall. By integrating multi-source data, the impacts of storm events on spatiotemporal differentiation mechanisms of tidal flat geomorphology are elucidated, providing scientific basis for the coastal protection.