Beachfront Development along the Pacific Coast of Colombia: A good thing? By Orrin H. Pilkey & William J. Neal

Posted In Beach of the Month, Features

By Orrin H. Pilkey and William J. Neal

Although it seems to defy logic, building a home right next to an eroding beach may be a good idea in some cases.

When the two of us, along with Jaime Martinez and Juan Gonzalez, were studying the Colombia’s Pacific Coast barrier islands, we visited a couple of small villages perched on the edge of rapidly eroding beaches (Martinez, et al., 1995). In one instance we watched as a house was being dismantled to be moved back. Local people told us that two men could dismantle and move most of the village houses in a matter of weeks (figure 1). At the time, they were keeping the village in the retreating back-beach position, yielding to beach retreat of a few meters per month due to extra high spring tides during an El Niño (figures 2 and 3).

We described the nature of these beautiful tropical beaches in our August 1, 2011, Beach-of-the-Month article.

Although there is a good sand supply coming via rivers from the nearby Andes Mountains, a combination of high wave energy, sea level rise due to global climate change, regional effects of seismic activity and El Niños, and local subsidence, cause beach retreat (shoreline transgression).

… At first the high-risk location of these villages didn’t make any sense to us. Why should the locals live so dangerously?”
—Orrin H. Pilkey and William J. Neal

The black to dark gray sandy beaches are littered with fallen trees, drift wood, and wrack lines of flotsam. Stands of mangrove forest that grew behind barrier beaches are now dead or dying (Figure 4).

At first the high-risk location of these villages didn’t make any sense to us. Why should the locals live so dangerously?

After a few days, however, we began to understand. Living in such a remote area, the villagers had no means of communication with the outside world, no phones, and no radios. The law and medical help were a long way away. Malaria-transmitting mosquitoes inhabit the nearby rain forest.

Ivan Correa and Juan Gonzalez summed up the reasons for such village sites in their 2000 article.

• The villagers know at any time the sea and weather conditions, in order to plan activities.

• The possibility exists of having eye contact with fishing teams at a short distance offshore (in dugout canoes).

• Being aware of travelers along the coast allows villagers to be able to provide or to demand
assistance in an emergency, especially useful because of the lack of radios.

• A minimum tourist infrastructure had been developed as a source of income, an important
alternative, considering that the two main economic activities, fishing and timber, were
becoming increasingly difficult.

• Directly facing the sea takes advantage of the sea breeze for a more comfortable climate and
especially to keep malaria-transmitting mosquitoes away.

Erosion rates along this coast are sporadic. Periods of stability of a few years are followed by catastrophic erosion and/or transgression rates resulting from earthquakes on the adjacent continental shelf (e.g., Tumaco, 1979) (See Correa and Morton, 2010, for a review of Colombia’s Pacific Coast). On Soldado Island along the central portion of the coast, we found that local sea level rise could be as high as 10 feet per century. As noted above, times of El Niño also accelerate the erosion rate.

Different strokes for different folks. In the remote Pacific coast of Colombia, beachfront development has been a necessity. But even there in a subsistence economy that depends on being next to the sea, the rising sea level is changing this option. As Correa and Gonzalez note, the village of El Choncho that had persisted for 91 years, being moved laterally or back from the retreating beach as necessary, finally had to move inland to a higher elevation in 1997. The move, however, was facilitated by the fact that all of the dwellings were built in such a way that they could be easily disassembled and reconstructed in a short period of time, and at a low cost.

… In a time of rising sea level we can only view such beachfront development as imprudent and irresponsible.”
—Orrin H. Pilkey and William J. Neal

Not so in the first world where beachfront development is placed in high-risk zones by choice, rather than necessity, and increasingly using construction that does not favor being easily moved out of harm’s of way in the future.

Even though widespread awareness of the importance of impending sea level rise is only a couple of decades old, post WWII beachfront development in the first world usually took place on shorelines that were clearly retreating.

In a time of rising sea level we can only view such beachfront development as imprudent and irresponsible.

Correa, Ivan D. and Gonzalez, Juan Luis, 2000, Coastal Erosion and Village relocation: A Colombian case study: Ocean and Coastal Management, 51 – 64.

Correa, I. D., and Morton, R. A., 2010, Coasts of Colombia: U. S. Geological Survey.

Martinez,J., Gonzalez J., Pilkey, O.H. and Neal W.J, 1995, Tropical Barrier Islands of Colombia’s Pacific Coast: Journal of Coastal Research, 432 – 453.

Colombian Pacific Beaches at the Mouth of Bahia de Buenaventura, By Orrin H. Pilkey and William J. Neal
Among the world’s most remote beaches are those that line the 62 barrier islands of Colombia’s Pacific Coast. Only two roads lead over the Andes to access points from which the islands and their few, very small, subsistence coastal villages can be reached by boat.


More / Beach Of The Month

“Beach Robbers”; By Charles O. Pilkey

December 1st, 2018

“Beach Robbers”, is a book chapter written and illustrated by Charles O. Pilkey, excerpted from “The Magic Dolphin: A Young Human’s Guide to Beaches, Sea Level Rise and Living with the Sea” by Charles O. Pilkey with Orrin H. Pilkey.

Read More

California’s Coastal Harbors, Beach Compartments and Sand Dredging; By Gary Griggs

October 1st, 2018

Every year the dredge at the Santa Cruz Small Craft Harbor along central California’s northern Monterey Bay sucks up about 250,000 cubic yards of sand, on average, from the entrance channel and pumps it out onto Twin Lakes Beach where it continues its journey down coast. If it were put in dump trucks, it would fill about 25,000 of them, but the waves can move all that sand without any human labor, and without any noise or carbon emissions.

Read More

Beyond Preservation: The Coral Restoration Foundation Bonaire; By Andrew Jalbert

August 1st, 2018

When avid scuba diver and famed Jurassic Park author Michael Crichton first visited Bonaire decades ago, he eloquently described the underwater environment as, “a world of riotous, outrageous color.” Years later, Bonaire has seen some changes but his assessment still largely rings true.

Read More

Management Strategies for Coastal Erosion Processes; By Nelson Rangel-Buitrago

June 1st, 2018

The Special Issue Management Strategies for Coastal Erosion Processes (MSforCEP) presents an international collection of papers related to the implementation of various management strategies for coastal erosion under specific objectives.

Read More

Sand volcanos on a flat and sandy beach in the Netherlands; By Bert Buizer, PhD

May 1st, 2018

In 2013, some interesting water escape structures were observed near the coastal resort of Bergen aan Zee, in the Netherlands.

Read More

Te Pito O Te Henua shore (Rapa Nui or Easter Island): a remote and mysterious place with rare beaches; By Nelson Rangel-Buitrago, William J. Neal & Adriana Gracia

April 1st, 2018

One of the most remote and youngest inhabited volcanic islands in the world is Te Pito o Te Henua Island, or as more commonly known: Easter Island (Rapa Nui or Isla de Pascua). World famous for its mysterious monumental statues (moai) erected by the early Rapa Nui people, the island is located in the southeastern Pacific Ocean nearly 3,650 km west of Chile.

Read More

Newfoundland’s Sandy Beaches: A Glacial Legacy; By William J. Neal & Joseph T. Kelley

February 1st, 2018

“Newfoundland” as a coastal place does not conjure up images of sandy beaches, but rather scenes of wave-cut rocky cliffs, bird rookeries on small rock islands, sea stacks, and boulder and cobble beaches if wave deposits are present. But scattered among the latter are genuine sand beaches.

Read More

Torrevieja, Spain; By Norma J. Longo

January 1st, 2018

Torrevieja, a former fishing village on the southeast coast of Spain (Costa Blanca) in Alicante province, is now a thriving tourist city with a 2016 population of around 85,000, down from a high of over 105,000 in 2013.

Read More

Archive / Beach Of The Month