Yanks fight for coastal retreat

question I’m wondering if you would comment specifically on erosion control and beach nourishment projects. Do you sense any evolution in public thinking about "real estate" on barrier islands and beaches, or are we always in danger of shortsighted technological "solutions"? — Joseph Clark, Tallahassee, Fla.

answer We are always in danger of shortsighted technological solutions. I have observed that each state, and even each community, seems to have to learn for itself the lessons that are already well understood elsewhere. It is an undeniable fact that seawalls destroy beaches, but Florida more than any other state refuses to learn (or to accept) that fact. Hundreds of seawall permits, mostly at the county level, were granted after Hurricane Ivan passed by the panhandle. One can even build a seawall without a permit, if it is an emergency, and of course, every seawall is built in an emergency.

Nourishment (the pumping of sand to a beach) is a better solution, but it is costly, must be repeated every few years, is environmentally damaging, leads to intensified development, and in the long scheme of things, is really only a Band-Aid solution. It’s better to move structures back or demolish threatened buildings. Before the post-World War II economic boom, many beach houses were built on long lots that allowed the houses to be moved back as the shoreline eroded.

question Who should pay for beach nourishment? — Donny Barber, Bryn Mawr, Pa.
answer Despite protestations to the contrary, most of the political pressure to pump sand on a beach comes from beachfront property owners. They were the ones who were dumb enough to build a house right next to an eroding beach. No reason why the rest of us more prudent souls should pay for the new beach.

question Do you know of any temporary coastal erosion structures (that work) that can be put in place prior to storms and removed after? — Joel Halsey, East Hampton, N.Y.

answer Many of the devices on the market today might be called snake-oil devices. They have fancy names (wave buster, sta-beach, surf breaker), but they rarely work as claimed. Virginia Beach used to send bulldozers out to their beach just before a storm, to pile up sand in front of critical areas, and after the storm, if the sand was still there, they would put it back in place. Not good for beach fauna, but it was one way to protect buildings that were too close to the beach. Other than that approach, I am not aware of a successful temporary structure. The problem is that a single storm can move huge amounts of sand, and interfering with this sand transport could damage adjacent beaches.

question Do you think artificial surfing reefs can help slow down erosion? — Chad Nelsen, San Clemente, Calif.

answer Whether artificial surfing reefs slow down erosion or not depends on the local situation. The problem is that such reefs may reduce the wave input to a beach and cause sand to be deposited. That may sound good, but trapping of sand is usually stealing of sand from some other beach. However, under just the right and, I think, unusual circumstances, such artificial reefs can be beneficial to local beaches. The proposed site needs to be studied carefully, and if possible, the reefs should be made adjustable or removable in case they cause erosion.

question The coastal cities near where I live seem hell-bent on development. How do we make them listen? — Erica Smith, Norfolk, Va.

answer How do we make them listen? What an important question. I used to think that all we would need for society to wake up was one powerful hurricane. In 1989, Hurricane Hugo roared ashore, causing massive damage in South Carolina. I thought surely this would bring people to their senses. But Hurricane Hugo turned out to be an urban renewal project. Small cottages that were destroyed in the storm were rebuilt as grand cottages. Multifamily buildings became high-rises. Every hurricane since has resulted in urban renewal projects.

Perhaps a glimmer of hope can be seen in the withdrawal of some insurance companies from the coast of Florida. But I suspect we will continue to see large buildings in costly developments. Prohibiting seawalls — like North Carolina, South Carolina, and Maine have done — helps. In the long run, prohibiting reconstruction of storm-destroyed buildings is an essential step, but this wouldn’t address the high-rise problem. High-rises essentially take away any flexibility for future response to sea-level rise. Once a high-rise is constructed, the pressure is great to preserve the valuable property, often at the expense of losing the beach.

One approach no one has tried is to allow no increase in the density of buildings in communities that accept federal or state tax money for beach nourishment. But how to make them listen remains a deepening mystery to me!

question Do you have any suggestions for moving away from building on beaches, cliffs, flood plains, steep slopes, or fire-prone canyons? — Ginger Wireman, Richland, Wash.

answer Ultimately, the solution is a political one that will require that rare combination of vision and courage in politicians. There is little chance that New Orleans will not rebuild in its entirety because this administration, wounded by its failures, is hardly likely to take the drastic steps needed to prevent future disasters. The current course of action is certain to set up a future disaster in the next big storm. As certain as the rising sun and the falling tide!

For beachfront property owners along eroding shorelines, one can guess within a few years when the building will fall in (unless costly beach-damaging action is taken). But the coastal development juggernaut seems unstoppable, even by hurricanes like Katrina. President Bush himself, on his first post-Katrina visit to the Gulf Coast and seeking to console Senator Trent Lott, stated, "Out of the rubbles of Trent Lott’s house — he’s lost his entire house — there’s going to be a fantastic house." This myopic view that the near-total destruction of seaside villages merely provides the opportunity to build bigger and better is a form of societal madness.

question Would you please explain what the problem is with seawalls? And what exactly are abyssal plains? — Hanna D., Troy, Mich.

answer When you build something stationary, like a seawall, next to the beach, you have stopped the retreat of the shoreline, but you have not addressed the underlying cause of erosion. Thus the beach continues to lose sand, growing narrower until it disappears. The process usually takes one to three decades.

Abyssal plains are the flattest surfaces on earth. They form as massive fluid sediment flows arrive from the continents and spread out when they hit the flat ocean floor, forming sediment "lakes." Most of these plains, which can be thousands of square miles in area, are found at water depths between 16,000 and 19,000 feet. The Hatteras Abyssal Plain is 20 to 50 miles wide and extends from off North Carolina to well beyond the southern tip of Florida, and over all that distance, the change in depth of the plain surface is less than 300 feet. Using a remote camera on that plain, I once photographed a soda bottle at a depth of 16,600 feet!

question I’m curious about your Folly Beach experience. How long ago was that, and why did they consider you "persona non grata"? — Jeanne Miller, Folly Beach, S.C.

answer About a dozen years ago, I vehemently objected to seawall construction on Folly and to the Corp’s outlandish claims about the probable lifespan of the proposed nourished beach. The town council didn’t take kindly to my troublemaking, but I’m happy to say the pendulum has swung a bit, and the local government is now more environmentally sensitive (though too late to prevent construction of new high-rises). Local citizens should be alert to the possibility that it will swing back. According to the local paper, most of a new nourished beach disappeared overnight in a small storm a few weeks ago.

question Why should a Midwesterner who may never see the ocean or the beach care about the health of our coastline? — Fred Dodson, Charlotte, N.C.

answer The reason that the quality of the development on the beach environment on, say, Folly Beach, S.C., is important to someone in Omaha, Neb., is that her federal taxes will pay for all kinds of things for the beachfront buildings including beach nourishment, flood insurance, and storm-damage recovery. On a more idealistic plane, preservation of this very limited, narrow, ephemeral, and very threatened ecosystem should be important for the same reason that preservation of Yellowstone, Glacier, and Olympic national parks is important. And besides, people from Omaha sometimes come to Folly Beach for vacation.

question It’s been proposed that we build barrier islands in the Mississippi Delta to protect and buffer New Orleans against future hurricanes. What are your thoughts? — Rob Carscadden, Kents Store, Va.

answer We are kidding ourselves if we think we can rebuild the Mississippi Delta with its fringing barrier islands just as they used to be. That’s one of the Corps proposals, but I strongly suspect that if they do the job, it will involve a lot of concrete rather than sand. We’ve got to get out from under the Corps’ defense of the status quo, because it will be very costly, and these costs can only accelerate in the future. Some delta towns will have to be lost. In all of this, we must recognize that sea level is rising faster in the Mississippi Delta than almost anywhere in North America. We need flexible and dynamic solutions much like nature’s own. Coastal scientists have proposed diverting the river mouth to a new location to provide new sediment to starved marshes. This is a great idea — one that attempts to do what the river would do naturally.

question Louisiana barrier islands are valuable ecosystems and highly endangered. Do you think they can and should be saved and restored to provide habitat for birds and fishes? — Ann Burruss, Lafayette, La.

answer The Louisiana barrier islands took a big hit in Katrina, but that’s the way the delta evolves. Barrier islands form here and disappear there, and have been doing so for thousands of years. I don’t think any islands should be saved or restored by artificial means. Engineering the delta is a bottomless pit. To the greatest extent possible, let nature take its course on the outermost delta, and there will always be habitats for birds and fish.

question Should people be allowed to move back into New Orleans’ flooded areas? — Clayton Ancona, Fort Collins, Colo.

answer If I was king of New Orleans, I would not allow the most heavily damaged areas to be reinhabited. I would shrink the city. I would select certain areas and raise their elevation with fill material and require all buildings to be on stilts. As it is now, nothing has really changed, and the city is very vulnerable to the next big one. We can’t compare the situation with Holland, where the whole country is built on a delta. We have lots of vacant high ground on the margins of the Mississippi Delta that can be developed. Think new city. For those who remain in the city, recognize that you will someday be flooded again, and be prepared.

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