How long can a Geotube® shoreline protection system last?
DATE POSTED: July 2, 2021
Decades—even under some pretty tough conditions. Here’s an example.
Nearly 25 years ago, Geotube® containers were installed at Atlantic City, New Jersey to protect more than a mile of shoreline and the famous boardwalk from storms and extreme high tides. The tubes were filled and covered with sand from the local area and planted with dune grass to give the appearance of a natural dune.
But only three months after project completion, Hurricane Luis produced three days of storms and 10- to 12-foot waves that pounded the shoreline. Once it was over, residents could see that sand had been washed from the ocean side of the Geotube® containers, but on the other side, there was no damage to property or loss of shoreline. The local media called it, “a line in the sand… there will be no more erosion past that line.”
Sand and vegetation was replaced and those same Geotube® containers have continued to protect the Atlantic City shoreline from storms, wind and waves. More severe weather in 2012, Super Storm Sandy, damaged the north end of the boardwalk, which was not protected by Geotube® containers, but the south end performed as designed and withstood the waves.
Why are Geotube® containers so successful in Atlantic City?
1. Massive size
Each Geotube® container is a monolithic structure—100 feet long, 7 feet high and a circumference of 30 feet. The circumference can be as much as 50 feet, which gives engineers the flexibility to select the most appropriate size of Geotube® to withstand damaging forces from waves and ice.
2. Durable Construction
Geotube® containers are made from high-tenacity polypropylene multifilament yarns, arranged in a stable weave. This material is highly resistant to UV, inert to biological degradation and resistant to chemicals, alkalis and acids. This material is also engineered to withstand scouring and punctures and can be reinforced for more demanding environments with a debris shield or polyurea coating.
Newly introduced Geotube® Durability Engineered Composites offer even more robustness and abrasion/damage resistance for shoreline projects. This advanced container incorporates a highly UV stabilized crimpled fiber that shields and cushions a woven geosynthetic underneath and also enables sand and soil entrapment so vegetation can easily be established. Watch our future e-news issues for more info.
3. Stable structure
Engineers incorporated Geotube® containers into the natural structure of the sand dunes. Geotube® containers form the core of a more storm-resistant sand dune structure. Although the Geotube® containers may be uncovered during a storm, the help limit erosion primarily to the ocean-side area and can be easily covered up afterwards.
Read more about the Geotube® shoreline protection project in Atlantic City.
Learn more about the advantages of Geotube® containers for shoreline protection.
Contact us to discuss your shoreline protection project.
Watch our webinar to learn more about Geotube Shoreline Systems.
You will learn about:
- Economic and environmental advantages of Geotube® solutions
- Using Geotube® solutions for breakwalls, revetements, sand dune cores, wetlands restoration and more
- Strength, versatility and customizability of Geotube® materials and products
- Design and installation of Geotube® systems
- Case studies from sites around the world
Geotube shoreline system protects historic New Jersey lighthouse
DATE POSTED: January 27, 2021
Over the past several decades, the shoreline around the East Point Lighthouse has receded continually, posing a major threat to the more-than-170-year-old landmark. Despite the creation of a dune system designed to protect against erosion and rising sea levels, the ocean is nearly at the building’s doorstep. In March of 2018, a severe storm severely compromised the dune system forcing municipal work crews to hastily pile sandbags along the shoreline in front of the lighthouse.
But a better solution with more longevity was needed. Later that year, the New Jersey Department of Environmental Protection began a project to install 600 feet of Tencate Geotube™ to reduce the risk of further erosion and help restore a natural, living shoreline.
Eight Geotube containers were laid end to end to cover the distance. Each was filled with sand and set on top of a scour apron held in place with anchor tubes. The scour apron is a critical part of the system, extending several feet beyond the Geotube to prevent wave action from compromising the shoreline under the structure. The lee side of the structure is further protected with Tencate sand filled mattresses, which are designed to remain exposed, endure abrasion and UV light, and also trap and hold soil on the surface to help establish a covering layer of vegetation.
Unlike conventional sandbags, a Geotube container is massive. In this case, a sand-filled Geotube is five feet high, 10 feet wide and weighs more than 3,000 pounds. Once the Geotube is set in place, it’s virtually immovable and can withstand waves, wind, abrasion and impact.
The new Geotube shoreline system was covered with sand to help create a coastal dune habitat, protect the inland wetlands from erosion and prevent the ocean from advancing further towards the historic lighthouse.
Learn more about Geotube containers for shoreline protection.
Contact us to discuss Geotube containers for your shoreline protection project.
Monolithic Protection From Shoreline Erosion
DATE POSTED: May 27, 2019
Does a massive, tapered structure provide better protection from shoreline erosion than rip rap or armor stone when a hard stabilization method is needed to protect property from shoreline erosion?
There’s a large body of evidence to say that it would.
More Than 150 Miles of Protection from Shoreline Erosion
More than 150 miles (241 km) of shoreline worldwide is protected by Geotube® containers against erosion caused by storms, waves, flood waters, ice and human activity. Many of these installations have been protecting shorelines for decades and face some of the toughest waves and weather on the planet.
Geotube® containers are one of the best alternatives for protection from shoreline erosion. The size, shape and materials of Geotube® containers all contribute to their success in providing superior shoreline protection.
Here’s how:
- Virtually immovable mass – A single Geotube® container is more than 100-feet (30.5-m) long and when filled with sand could weigh up to 150 tons (136 tonnes). With that much mass, it becomes extremely difficult for waves or ice to shift the Geotube® container.
- Deflective elliptical shape – As ice advances towards the shoreline, the elliptical shape of the Geotube® containers can deflect the ice and force it up and over the structure. Conventional barriers made of materials such as armour stone or timber, face the ice head-on and are often dislodged or heaved up.
- Durable, impact-resistant technology – Geotube® containers are specially designed for shoreline protection and are manufactured using high-strength polypropylene multifilament yarns that meet several ASTM standards for fabric strength, seam strength and puncture resistance. In extremely demanding applications, Geotube® containers can be further protected with a Geotube® Debris Shield, a polyurea coating, or even a conventional barrier such as an armour stone wall.
- Simple installation – A breakwater structure made of Geotube® containers could be filled with material that is dredged from the water body. This dramatically reduces truck traffic, carbon emissions, and could also reduce the time and cost to complete the project.
A Success Story:
A Geotube® shown during installation at Round Lake, Ontario in 2013. The 100-foot long container has provided several years of shoreline protection from waves and ice push. Due to its bulk and rounded contour, waves and ice have been unable to shift it and compromise the integrity of the shoreline. The Geotube® container is also more aesthetically pleasing than alternatives since it’s covered with soil and provides a gently sloping surface that resembles the natural shoreline.
Learn more about Geotube® containers for shoreline protection.
Contact us to discuss how Geotube® containers can contribute to the success of your shoreline protection project.
Shrouded in secrecy – A closer look at Geotube shoreline protection systems that work under cover
DATE POSTED: February 27, 2019
Shoreline protection systems often need to blend in and maintain a low profile, whether they’re working in a natural environment or in a densely developed urban space. So how do engineers, urban designers and conservation authorities hide expansive Geotube® shoreline protection systems that can stretch for hundreds or even thousands of feet?
Over 150 miles of shoreline worldwide is already protected with Geotube® technology, providing reliable, cost-effective protection from water erosion and storm damage. Most of these systems are permanent–and nearly invisible–installations that can also help improve the aesthetics of the shoreline and rebuild natural habitats such as wetlands.
Atlantic City, New Jersey, USA
More than 20 years ago, Geotube® containers were installed at Atlantic City, New Jersey to protect more than a mile of shoreline and the famous boardwalk from storms and extreme high tides. The tubes were filled and covered with sand from the local area and planted dune grass to give the appearance of a natural dune.
Cancun Beach, Cancun, Mexico
Cancun’s beaches were severely eroded by Hurricane Wilma in 2005, leaving steep drop-offs and waves advancing right up to ocean-front resort buildings. Over 1.2 miles of Geotube® containers were installed immediately to protect the properties, followed by offshore submerged breakwaters to function as a sandbar and encourage natural beach replenishment. The shoreline Geotube® containers were covered with sand and are invisible to beachgoers.
La Antigua, Veracruz, Mexico
Seasonal flooding and riverbank erosion were threatening many historical structures and a marina in the tourist village of Rio La Antigua. Rather than attempt costly conventional methods such as increasing the height of berms and dykes or shipping in armor stone, engineers installed Geotube® containers in a two-layer, stair-step arrangement. The fibrous surface of the Geotube® containers will entrap sand and sediment, enabling vegetation to be established over time and conceal the containers.
Learn more about Geotube® containers for durable, long-lasting and discreet, shoreline protection.
Prevent shoreline erosion: Geotube® units make resilient, immovable groynes
DATE POSTED: November 27, 2018
Shoreline protection: Geotube® groynes fight erosion in Quebec reservoir
Wind, waves, and currents are no longer a problem for a section shoreline in Lac Saint Jean. A Geotube® shoreline protection system was able to prevent shoreline erosion issues and improve bank conditions at the Quebec lake.
Because the lake acts as a water reservoir for the generation of hydroelectric power, operators keep the water level high. This artificially high water level can potentially destabilize the lake’s shoreline. Since 1986, the site owner has been taking a proactive approach to prevent shoreline erosion.
Three groynes were constructed using Geotube® containers, allowing for the elimination of erosion along a section of shoreline. Each groyne incorporates two Geotube® containers that stretch 200-feet (61-metres) into the lake. In an unusual step, the installation occurred during the winter, as the lake was frozen over. This approach enabled installation of the containers to occur in a dry area rather than in deep water.
Each Geotube® container was placed on a protective scour apron and held in place with anchor tubes. Trucked-in sand was mixed with water from the lake, and pumped into each container. As the lake thawed, water flowed in around the Geotube containers and covered them almost entirely.
Geotube® containers provide significant advantages over conventional construction techniques for jetties or groynes. Typical groynes often incorporate wood, earth, stone, or concrete, making them susceptible to breakage by ice and waves. Conversely, a full Geotube® container becomes a single, massive structure that is virtually immovable. In many cases, a Geotube® groyne can be installed more quickly and at a lower cost than conventional approaches.
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