Fig. 3: Additional wave height reduction compared to sites without vegetation achieved by healthy and dormant marsh species.

Additional wave height reduction compared to site without vegetation achieved by six healthy and two dormant marsh species a at different vegetation width, and b additional wave attenuation with 40-m marsh width as a function of stem rigidity. Triangles are dormant conditions for Spartina anglica and Scirpus maritimus. Stem rigidity is defined by the elastic modulus \({E}_{s}\), and bending moment of inertia \({I}_{s}.\). This figure corresponds to the marsh-fronted seawall configuration in Fig. 1, with water depth at the toe of seawall \({h}_{t}\)= 3 m. Other parameter values given in Fig. 1b were adopted from Vuik et al.51.