effect of new structures at headland of crenulate-shaped bays on the equilibrium shape of bays in mokran coasts

Construction of a new coastal structure changes the stable shape of the shoreline. this issue generally leads to sedimentation and erosion around adjacent structures due to changes in littoral sediment transport (lst). this mechanism is considerably more complicated in crenulate-shaped bays than in straight shorelines. therefore, special theories have been introduced for these bays. in addition to the above-mentioned difficulties, using two-dimensional long-term morphological models with considerable run times is not practical in most real cases. instability and numerical errors may also be occurred due to the complicated forms of shorelines. the aim of this research is to introduce a proper morphological model for south-eastern shorelines of iran. long term morphological simulation has been done for three important bays in the mokran coasts using numerical and empirical models. the results show that these models are appropriate for understanding the behavior of crenulate-shaped bays. their responses to natural changes like climate changes as well as human interventions can also be simulated properly.