  We presented numerical simulation of long waves, interacting with arrays of
emergent cylinders inside regularly spaced patches, representing discontinues
patchy coastal vegetation. We employed the fully nonlinear and weakly
dispersive Serre-Green-Naghdi equations (SGN) until the breaking process
starts, while we changed the governing equations to nonlinear shallow water
equations (NSW) at the vicinity of the breaking-wave peak and during the runup
stage. We modeled the cylinders as physical boundaries rather than
approximating them as macro-roughness friction. We showed that the cylinders
provide protection for the areas behind them. However they might also cause
amplification in local water depth in those areas. The presented results are
extensively validated against the existing numerical and experimental data. Our
results demonstrate the capability and reliability of our model in simulating
wave interaction with emergent cylinders.
