Data also indicate that the timing of erosion and accretion during storms may be strongly influenced by wave steepness. In contrast, spatial variations in beach volume change during the building portion of this storm were not explained well by either alongshore variations in wave height or predicted relative runup. Specifically, the amount of wave dissipation in the inner surf-zone, as measured using time-averages of X-band radar returns, explained 50% of the variability in beach volume change during the building portion of the storm. These data suggest that spatial variations (O(100m) alongshore) in shoreline and beach-volume change are related to alongshore variations in inner surf zone morphology, which alters the amount of wave dissipation alongshore. These changes were compared with simultaneous observations of surf- and swash-zone morphology as well as with modeled and observed wave parameters during the storm to analyze patterns of erosion and accretion. Observations of beach volume and shoreline change from terrestrial laser data were collected semi-daily during a Nor’Easter along 10 km of the Outer Banks of North Carolina. Intersection of the radar data with the laser data also provides data on spatial variations in the maximum swash excursion during the time of the survey. In addition, CLARIS provides spatial maps of wave direction from the radar data, and localized measurements of inner-surf zone wave height and shoreline setup from laser time-series. Coastal Lidar and Radar Imaging System (CLARIS), is a fully-mobile remote sensing system designed to operate during storms and collect topography data of the beach from a terrestrial laser scanner as well as bathymetry data from X-band radar-derived wave celerity measurements, and surf- and swash-zone morphology data from time-averaged radar images. ``Pre-’’ and ``post’’-storm surveys likely underestimate the total impact of a storm on the beach. Anecdotal evidence suggests that at least during moderate storms, such as the frequent extratropical storms that batters the Outer Banks of North Carolina, significant amounts of recovery may occur while the storm continues and waves are still large. We will honor our scheduled check ins this weekend, but caution is urged for all who are travelling today with heavy rain predicted to make roadways flood in some places.Storm-scale coastal change is traditionally observed using ``pre-’’ and ``post’’-storm surveys, making explicit observations of processes driving alongshore variability in erosion and accretion during the storm difficult. There is no evacuation order in place for our area, nor do we expect that to change. Otherwise we expect the impacts to be minimal, and it is business as usual here on the OBX.
Likewise winds are expected to pick up to the 20-25 MPH range today. We expect to have heavy rain begin today and continue through tonight and into tomorrow. The most probably projected path of the storm continues to take the storm up the South Carolina coast today to a point north of Charleston, SC and Wilmington, NC at which time the storm is expected to take an abrupt turn to the East, and then out to sea before the storm turns to the South away from the Outer Banks. Higher tides are expected as well as some beach erosion. We are under a Hurricane watch this morning, a flash flood warning, and a state of emergency remains in effect for the majority of North Carolina.
While the storm has weakened from the interaction with land, it is still a dangerous storm causing significant damage in its path.Īs for the Outer Banks this morning we are seeing outer rain bands from the storm start to affect our weather. The storm continues to be a category 2 storm with winds near 100 MPH near the eye of the storm. Our thoughts and prayers go out to residents of Florida, Georgia, and South Carolina which have seen significant damage from win, rain and flooding. Hurricane Matthew continues to be a monster storm that has and is pounding coastal communities to our south.
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