To address the issue of local seabed scouring induced by pile-supported permeable breakwaters in engineering applications,we investigate the effects of baffle opening modes and porosity on the flow field structure and sediment scouring characteristics in front of the breakwater,using an inclined baffle structure as the research object.On the basis of a FLOW-3D numerical model,we design three flow intensities and five baffle configurations,and reveal the mechanisms of different structural parameters affecting local scour through simulation analysis of the surrounding flow velocity field,vorticity field,and seabed morphological evolution.The results show that under the same flow velocity,a lower baffle porosity leads to stronger vortex structures behind the baffle and in the front of piles,resulting in significantly increased scour depth and range,and a downstream shift in sediment deposition position.Under the same porosity,a smaller opening size of lower part of the baffle causes greater disturbance to the near-bed flow,thereby intensifying scouring.The baffle configuration has a significant impact on seabed scour.It is necessary to comprehensively consider the coordinated performance of both wave dissipation and scour resistance in the structural design of such breakwaters.