At the edge of the mangrove
forests the longer infragravity band will therefore already
substantially contribute to the water surface variance.
Within the mangrove forest this effect is enhanced since
longer-period waves such as swells and infragravity waves
are subject to less attenuation, whereas short-period waves
with frequencies related to wind waves lose substantial
energy due to stronger interactions with the vegetation. To
consider the effect of both incident waves and infragravity
waves, the XBeach model was used in this study to provide
insight into the wave attenuation in mangrove forests and to
evaluate the critical value of mangrove width as found for the
east coast of Vietnam in more quantitative terms