Seagrass beds are so effective in protecting tropical beaches from erosion, that they can reduce the need for regular, expensive beach nourishments that are used now.
In a recent article in the journal BioScience, biologists and engineers from The Netherlands and Mexico describe experiments and field observations around the Caribbean Sea. “A foreshore with both healthy seagrass beds as well as calcifying algae, is a resilient and sustainable option in coastal defense”, says lead author Rebecca James, PhD-candidate at the University of Groningen and the Royal Dutch Institute for Sea Research (NIOZ), The Netherlands. “Because of erosion, the economic value of Caribbean beaches literally drains into the sea.”
Increasing erosion with climate change
The authors looked at beaches of the Caribbean Sea, where almost a quarter of the Gross Domestic Product is earned in tourism, mainly around the beaches. “With the increase of coastal development, the natural flow of water and sand is disrupted, natural ecosystems are damaged, and many tropical beaches have already disappeared into the sea”, co-author Rodolfo Silva, professor of Coastal Engineering at the Universidad Nacional Autónoma of Mexico says. “Until now, expensive coastal engineering efforts, such as repeated beach nourishments and concrete walls to protect the coast, have been made to combat erosion. Rising sea-level and increasing storms will only increase the loss of these important beaches.”
Experimental field flume
To find out to what extent seagrass beds are able to hold sand and sediment on the beach foreshores, James and her promotor, professor Tjeerd Bouma (NIOZ and Utrecht University), conducted a simple but telling experiment. With a portable and adjustable field flume to regulate water motion in a Caribbean bay, they observed when particles on the sea bed started moving. “We showed that seagrass beds were extremely effective at holding sediment in place”, James says. “Especially in combination with calcifying algae that “create their own sand”, a foreshore with healthy seagrass appeared a sustainable way of combating erosion.”
More seagrass, less erosion
Along the coastline of the Mexican peninsula of Yucatan, the team put their theory to the test. “By looking at beaches with and without protection of healthy seagrass beds, we showed that the amount of erosion was strongly linked to the amount of vegetation: more seagrass, meant less erosion”, co-author dr. Brigitta van Tussenbroek of the Universidad Nacional Autónoma in Mexico says. At beaches where seagrass beds were destroyed, the researchers saw a sudden strong increase in erosion, resulting in an immediate need of expensive beach nourishments.
Promising future prospects
Both NGO’s and engineering industry welcome these novel insights. “To date, seagrass beds are too often regarded as a nuisance, rather than a valuable asset for preserving touristically valuable coastlines. This study could change this perspective completely”, Bas Roels of World Wildlife Fund Netherlands says. “The study opens opportunities for developing new tropical-beach protection schemes, in which ecology is integrated in engineering solutions”, adds Mark van Koningsveld, professor at the Delft University of Technology and working for the international marine contractor Van Oord.
According to co-author Johan Stapel of the Caribbean Netherlands Science Institute (CSNI) on St. Eustatius this will require a multilateral approach in conservation and restoration, as seagrass faces increasing pressure from various sources of pollution and invasive species. “Fortunately, NIOZ has a strong tradition in successfully restoring all kinds of coastal vegetation from seagrass to mangroves”, Bouma concludes.
Learn more: Seagrass saves beaches and money
The Latest on: Restoring coastal vegetation
via Google News
The Latest on: Restoring coastal vegetation
- Voracious Purple Sea Urchins Are Ravaging Kelp Forests on the West Coaston October 25, 2019 at 12:57 pm
Bull kelp is one of the fastest-growing plants on Earth ... But there is, in all likelihood, no easy fix for restoring the health of kelp forest ecosystems along the northern west coast. In their ...
- PG&E is restoring power after another round of intentional shutoffs in Californiaon October 24, 2019 at 5:16 pm
(CNN) — California’s largest utility is working to restore power to tens of thousands of customers after another round ... The utility is considering a second blackout due to the possibility of strong ...
- PWD 'mistakenly' razes down over 100 plants in Chennai park, later offers to replanton October 24, 2019 at 4:37 am
The official adds, “This area is part of CRZ (Coastal Regulation Zone) and needs to be protected. We understand the efforts put in by Nizhal and also the love with which people have nurtured plants.
- Alabama beach mouse helped build the dunes that protect our coaston October 23, 2019 at 5:21 am
When they carry the seeds of sea oats and other plants back to their burrows ... In areas where dune restoration work is underway people are doing by hand what the tiny beach mice did for free for ...
- Sunset of lease helps Everglades restorationon October 22, 2019 at 9:01 pm
Ron DeSantis, a strong supporter of Everglades restoration, said the agreement “is an important step forward in expediting construction of the [Everglades Agricultural Area] Reservoir Project and ...
- FWC to spray herbicides on Lake Okeechobee, restore East Lake Toho, close hogfish seasonon October 22, 2019 at 12:14 pm
FWC to spray herbicides on Lake Okeechobee, restore East Lake Toho, close hogfish season What the heck are spikerush, spatterdock, maidencane and duck potato? Florida native plants the FWC is trying ...
- Restoring Earth's natural defenderson October 22, 2019 at 7:12 am
An incredible group of species, mangroves obtain fresh water from salt water, enabling them to thrive in harsh and unstable coastal habitats. They do this by either secreting ... Alongside all of this ...
- JOSH NOSEWORTHY: Our future may depend on restoring the Acadian foreston October 21, 2019 at 3:03 am
The Nature Conservancy of Canada (NCC) has written the Acadian Forest Restoration Manual to support landowners ... working to protect our most important natural areas and the plants and animals they ...
- A sustainable coastal home for a retired coupleon October 17, 2019 at 10:16 pm
To preserve coastal views, view and ventilation have been separated ... The system has also been designed to incorporate electrical battery storage in the future. New landscape works restore native ...
- Restoration Efforts Generating "Robust" Dunes On Pensacola Beachon October 15, 2019 at 12:38 pm
“Two main factors are vegetation, coastal vegetation and wind,” said Schmutz ... even in the last three years that have had some pretty good modification impact on our dunes.” Another factor related ...
via Bing News