Alongshore Variable Accretional and Erosional Coastal Foredune Dynamics at Event to Interannual Timescales

Natural and constructed dunes are increasingly being utilized to buffer flooding impacts from storms rising sea levels along sandy coastlines. However, a lack of data at the appropriate spatial temporal resolution often precludes isolating total magnitude, specific timing, alongshore variability volumetric coastal dune changes resulting both wave wind-driven processes. Here mobile terrestrial lidar 46 collections 6.5 km stretch beach in Duck, NC, USA used assess magnitude drivers variable responses between 2012 2020. Despite numerous major storm events which impacted over this time period, grew volumetrically nourished un-nourished sections study site. Growth was seasonally spatially with largest growth recorded Fall, coinciding period frequent windy but also highest water levels, regions lowest gradient βbeach. The vertical accretion patterns these wind-blown sediments shown vary depending on management style, specifically, if were not managed, sand fenced, or artificially constructed. Dune erosion occurred episodically within steepest sloped likely be most during individual events.