The presence of a sea dike can limit the width of a mangrove
forest from the landward side and its presence is expected to
play an important role in the stability of mangrove forests. The
influence of five different sea dike locations on wave transformation into the mangrove forest is presented in Figure 10. On
the basis of this figure, it seems that the short-wave
transformation is independent of the cross-shore location of
the dike since all incident band energy is attenuated by the
mangrove within 50 to 100 m. The long-wave height transformation instead is strongly affected by the cross-shore location
of the dike. The more seaward the dike the higher the longwave variance, which is likely related to long-wave reflections
on the sea dike