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Coastal erosion describes the displacement of land caused by destructive sea waves, currents, or tides. Major efforts have been made to mitigate these effects using groynes, breakwaters, and various other structures. We address this problem by applying shape optimization techniques on the obstacles. We model the propagation of waves toward the coastline using two‐dimensional porous shallow water equations with artificial viscosity. The obstacle's shape, which is assumed to be permeable, is optimized over an appropriate cost function to minimize the height and velocities of water waves along the shore, without relying on a finite‐dimensional design space, but based on shape calculus.

Shape optimization for the mitigation of coastal erosion via porous shallow water equations