Gulf coast's shifting sands draw attention in erosion control studyMay 23, 2001
COLLEGE STATION, Texas -- For the past 50 years, erosion on Galveston Island has claimed as much as 10 feet of shoreline a year. It's a problem that's particularly visible on the island's west end, where there is nothing in place to buffer the waves or capture the sand as currents move it along the coastline.
Over the years, officials and homeowners have experimented with different ways of controlling erosion -- installing long tubes filled with sand (or geotubes) between the beach and homes and trucking in sand to replace that lost to erosion.
In a project funded by Texas Sea Grant, Texas A&M University at Galveston's Thomas Ravens is studying the effectiveness of these erosion-control methods as well as how much sand is being lost, how much is being gained and how it's being carried around in offshore water currents.
Ravens said that by first measuring how much sand is being lost and gained on Galveston beaches and how much sand is being transported in water currents, researchers can then use this information to devise the most appropriate control methods for different locations.
"A lot of people think -- perhaps rightly -- that the solution to coastal erosion is beach nourishment, putting more sand on the beach," he said. "But in order to do that, you need to know how much sand you're losing in the first place. The first part of our study will answer that question and allow managers to go in and say how much sand they need to supply to compensate for erosion."
Under normal circumstances, rivers carry sediment to coastal areas, and currents flowing parallel to the coastline distribute the sand to the beaches, replenishing sand lost to erosion. But as humans dam rivers, Ravens said, this sand source is cut off, and the amount of sand making it to the coast is not enough to make up for that lost to erosion.
Meanwhile, global water levels are rising and parts of Galveston Island are sinking because of the pumping out of groundwater, oil and gas, he said. All of this leads to greater erosion rates. Galveston is already at a disadvantage because its beaches are so flat. For every 1-meter rise in water level, Ravens said, Galveston loses 100 meters of beach to the Gulf of Mexico.
"We suffer because our beaches are so flat," he said. "Just a little change in elevation of the water leads to a big change in terms of where the shoreline is because the slopes of the beaches are so low."
Gradually sloping beaches are just one of the factors that distinguish Gulf Coast beaches from those on the East or West coasts, he said. The other is the fine sediments found in the Gulf region. Because of these differences, Ravens said, erosion and sediment transport models developed for the other two coasts are not effective for predicting conditions along the Gulf.
Ravens said the project includes creating sediment transport models and equations that will be specific to the Gulf Coast. People will be able to use these to predict what will happen if, for example, a breakwater or geotubes are installed along Galveston Island.
"This kind of information about exactly what's happening in nature will be very valuable for people whose job is to manage and plan for nature's contingencies," he said.
Thomas Ravens, Ph.D., Texas Sea Grant Research Scientist,
Office Phone: (409) 740-4465; Email: firstname.lastname@example.org
Mark Evans, Texas Sea Grant Communications
Office Phone: (979) 862-3770; Email: email@example.com
The National Sea Grant College Program is a partnership of university, government and industry, focusing on marine research, education and advisory service. The Sea Grant Program is a practical, broad-based effort to promote better understanding and use of marine resources through research, education, extension and information transfer.
National Sea Grant College Program
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Related Erosion Reading:
Erosion: Changing Earth's Surface (Amazing Science)
by Robin Koontz (Author), Matthew Harrad (Illustrator)
Did you know that rain, waves, wind, snow, and ice can change the shape of Earth’s surface? They can create valleys, sea stacks, caves, and rock arches. Learn about the natural forces of erosion and how they shape the land. View Details
Weathering and Erosion (Science Readers: Content and Literacy)
by Torrey Maloof (Author)
The Earth's surface is always changing. Learn how weathering and erosion constantly reshapes the earth through wind, water, and more! Even people can drastically change the earth's surface. With the help of easy-to-read text and bright, colorful images, this reader simplifies challenging scientific topics while keeping students engaged from cover to cover. This reader also includes instructions for an engaging science activity where students can see what happens when land erodes. A helpful glossary and index are also included for additional support. View Details
Cracking Up: A Story About Erosion (Science Works)
by Jacqui Bailey (Author), Matthew Lilly (Illustrator)
Describes the process of erosion and how water, ice, wind, and sun wear away at Earth's surface. View Details
Erosion (Reading Essentials in Science)
by Virginia Castleman (Author)
Earth is changing every day as a result of erosion, and weather plays a major part. View Details
Erosion and Weathering (Rocks: The Hard Facts)
by Willa Dee (Author)
Discusses the different causes of erosion and weathering, how these phenomena create problems for people, and their role in the rock cycle. View Details
Erosion (Let's Explore Science)
by Shirley Duke (Author)
Examines the different forces of erosion, such as wind, waves, acid rain, and glaciers and explains how those forces affect the topography of the earth. View Details
Soil Erosion and How to Prevent It (Everybody Digs Soil)
by Natalie Hyde (Author)
Looks at the processes of weathering, erosion, and deposition, and how they affect plant and animal life. View Details
Dirt: The Erosion of Civilizations
by David R. Montgomery (Author)
Dirt, soil, call it what you want—it's everywhere we go. It is the root of our existence, supporting our feet, our farms, our cities. This fascinating yet disquieting book finds, however, that we are running out of dirt, and it's no laughing matter. An engaging natural and cultural history of soil that sweeps from ancient civilizations to modern times, Dirt: The Erosion of Civilizations explores the compelling idea that we are—and have long been—using up Earth's soil. Once bare of protective vegetation and exposed to wind and rain, cultivated soils erode bit by bit, slowly enough... View Details
Erosion (Princeton Series of Contemporary Poets)
by Jorie Graham (Author)
. . . . How clean
the mind is,
holy grave. It is this girl
della Francesca, unbuttoning
her blue dress,
her mantle of weather,
to go into
labor. Come, we can go in.
It is before
the birth of god. No-one
has risen yet
to the museums, to the assembly
and wings to the open air
market. This is
what the living do: go in.
It's a long... View Details
Erosion: How Land Forms, How It Changes (Exploring Science: Earth Science)
by Darlene R. Stille (Author), Farhana Hossain (Illustrator)
Describes the process of erosion, including how the power of wind, water, and glaciers have changed the Earth's surface. Includes information on fossils. View Details