Drivers of cross-shore chenier dynamics off a drowning coastal plain

A chenier is a beach ridge, consisting of sand and/or shells, overlying muddy substrate. In this paper, we explore the cross-shore dynamics cheniers in their ‘active’ phase, i.e. phase between formation and landing on shore can no longer be reached by daily wave tidal influences. While described literature are known to only migrate onshore until they reach stable position with crest level above influences, observations Demak suggest existence an alternative state, highly dynamic short term, but term. To developed idealised model investigate under The able predict both offshore migration; migration mainly driven action, while induced lag, or effect storm season. For certain combinations waves, tide (incl. lag) season effect, predicts dynamically chenier. absence lag yields ‘classic’ that welds onto shoreline migration.