Core Banks (NC), 48” x 35.” Batik on silk by Mary Edna Fraser
By Celie Dailey
In the minds of artist Mary Edna Fraser and geologist Orrin H. Pilkey, their two disciplines do not seem so far apart. Their first meeting in 1993 occurred when Mary Edna accompanied Orrin on an excursion to Cape Lookout National Seashore to do some “ground truthing” with his students. They soon realized that their passions for barrier islands were equal, although seated in different bodies of knowledge. Over the roar of the Duke University research vessel, they shook hands.
World-renowned coastal geologist Orrin H. Pilkey says of his pairing with the artist: “Mary Edna Fraser and I are partners in appreciation and concern for barrier islands. I come into the partnership with experience in study of the oceanographic and geologic actions of these islands and fascination with the hugely dynamic nature of these moveable strips of sand. Fraser comes into the partnership because she is intrigued by their forms, contrasts, historical significance, and beauty. We hope that together we can play a role in preserving barrier islands for future generations.”
Mary Edna Fraser is an internationally recognized master of the textile art of batik who has flown the eastern seaboard of America and many foreign coastlines in her search for pristine environments that form the basis of her art. (For an explanation of batik art, see Mary Edna’s website).
Together, Fraser and Pilkey bring an understanding of coastal geology and global change to the public in a way that is scientifically astute and visually intriguing.
North Carolina native Mary Edna Fraser’s first task for Pilkey was to photograph Core Banks as the basis for her batik on silk, seen here. Her father, Claude Burkhead, Jr., piloted the family’s 1946 Ercoupe to the Outer Banks on a mission to supply Pilkey with aerial images in February of 1995. Thus began a continuous collaboration, publishing of A Celebration of the World’s Barrier Islands in their critically acclaimed 2003 text from Columbia University Press.
Numerous exhibitions and lectures combining Pilkey’s text and Fraser’s art have followed since their meeting, beginning with “Aerial Inspirations” at the Smithsonian National Air and Space Museum in 1994. Their current efforts are directed toward Global Change: A Primer, an upcoming publication by Duke University Press, co-authored by Orrin’s son Keith Pilkey.
Orrin H. Pilkey gives insight into Core Banks in their book, A Celebration of the World’s Barrier Islands: “Core Banks, shown here, is part of the Cape Lookout National Seashore and is a rare natural laboratory to study barrier island migration.
During Hurricane Dennis, the island migrated a foot or so toward the mainland….Most of the overwash sand penetrated only a few tens of yards, but the occasional large wave combined with a high tide and high storm surge level to push sand completely across the island and into the south behind. The net result was an island with a slightly higher average elevation than before the storm….What happened on Core Banks was a tiny step in the island’s long-term response to sea level rise. Because the ocean-facing beach retreated a bit and the mainland-facing lagoon side of the island built out a bit into the lagoon, the entire island moved landward ever so slightly.”The island that is eroding on both sides did not disappear, but instead was reinforced and strengthened.
Increased storminess, and even a subtle change in sea level rise, will certainly continue to cause economic hardship on developed barrier islands around the world. These islands continue to exist because they are able to respond dynamically to change. They have persisted through great dips and swells in sea level. In conversation on the beach, Orrin has reminded Mary Edna that erosion only becomes a problem on these islands when man’s structures become threatened. And, as we face an unstable future, it is wise to avoid building here, where the first effects of global change are already being seen.
Mary Edna takes liberties with color and design to convey the enthusiasm with which she and Orrin view the natural world. Inspired by images of Japan’s Edo Period (1615-1868), Fraser depicts the “floating world” in which she flies. Fraser hopes that their current text will reach a broad audience and, in her own words, that “…the art in this book enhances the scientific research of the authors. We live in a time where, like Newton, fact is questioned and scoffed. Perhaps the images will help open windows into minds presently shuttered. Education enlightens and our future depends on honest conversations based in empirical reality.”
Fraser and Pilkey’s upcoming exhibition, Our Expanding Oceans: The Blending of Art and Science, at the North Carolina Museum of Natural Sciences (June 2011 – May 2012) presents the largest collection of Fraser’s batik art ever on display. It will show a spectrum of history between Mary Edna Fraser and Orrin H. Pilkey with a focus on melting ice and rising seas.
Expect to see continued coverage of Fraser and Pilkey’s endeavors published by coastalcare.org on a monthly basis.
The Beaches of Core Banks
By Orrin H. Pilkey, James B. Duke Professor Emeritus of Earth Sciences, Division of Earth and Ocean Sciences, Nicholas School of the Environment
The beaches of Core Banks Core Banks’ beaches are a vanishing breed. They are almost purely natural with no contamination or dilution by artificial (nourishment) sand. The beaches on islands to the north (Ocracoke) and to the south (Shackleford Banks) are also unnourished although a lot of beach bulldozing has gone on at the north end of Ocracoke to protect the Highway 12. All these island beaches are pristine because they are part of the US National Seashore System.
The sand on Core Banks is primarily quartz with a small amount of plagioclase feldspar (5% plus or minus) and some heavy minerals that form the black sand patches on this beach. Occasionally there are small patches of purple sand which form when the winds are just right to whisk away the other heavy minerals leaving a concentration of purple garnet behind. There is a fair amount of ground up shell material in the beach sand (less then 10% as a rule) that gives the beach a light yellow brown coloration because the shell is stained brown from iron oxide.
The main sources of sand for Core Banks’ beaches are:
– The adjacent continental shelf, pushed up by waves.
– Longshore transport mainly from the north.
Rivers are not contributing sand at present because the sand they are transporting drops out at the heads of local estuaries, miles inland from the beaches. Sand is lost from the beaches of Core Banks as follows:
– Storm overwash when sand is deposited on the island by storm waves.
– Offshore movement of sand during large storms.
– Alongshore transport of sand in a north to south direction.
Sand is transported dominantly from north to south on the beach, eventually ending up at the tip of Cape Lookout where the sand travels seaward, out on to the Cape Lookout Shoals. Most of Core Banks’ sand does not turn the corner at the cape and continue downcoast.