Carolina Environmental Diversity Explorations

Small sand volume barrier islands · By Dirk Frankenberg

North Topsail Beach

Figure 7. These condominiums sit close to the shoreline. (Photograph by the author. More about the photograph)

Figure 7 begins our tour of North Topsail Beach, a developed, low sand volume area of Topsail Island. The photograph shows the same flat topography that we saw on Masonboro, but this time there is a condominium complex right on the berm. The flat dunefield on the left shows evidence of overwash that we will examine later but the beach on the right shows evidence of a small ridge and runnel feature such as that shown on Masonboro in Figure 3. These small accretions of sand will rebuild the upper beach, but as a result of offshore ridges, the amount of sand added will not create the high dunes one might wish to have between one’s condominium and the ocean during storms.

Definitions

topography n.
The surface features of a place or region; the character, natural features, and configuration of land; terrain.
berm n.
A terrace formed by wave action along the backshore of a beach.
ridge n.
In beach topography, an area that is raised above the adjacent shore and dips into a runnel, which is a narrow channel or course, as for water.
runnel n.
The lower surface over which water flows laterally along a beach.
dune n.
A hill or ridge of wind-blown sand.