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Home NEWS Science News Chemistry

Sea level rise requires extra management to maintain salt marshes

Bioengineer by Bioengineer
July 17, 2019
in Chemistry
Reading Time: 3 mins read
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Credit: Zhenchang Zhu at NIOZ

Salt marshes are important habitats for fish and birds and protect coasts under sea level rise against stronger wave attacks. However, salt marshes themselves are much more vulnerable to these global change threats than previously thought. Stronger waves due to sea level rise can not only reduce the marsh extent by erosion of the marsh edge, but these waves hamper plant (re-)establishment on neighboring tidal flats, thus making it much more difficult for the marsh to recover and grow again. An international research team, led by researches from the Netherland Institute for Sea Research (NIOZ), reports these results in a paper published on Jul.16, 2019 at Limnology and Oceanography.

Sea level rise limits recovery of eroded marshes

Marsh loss often takes place when waves erode the seaward marsh edge. Sea level rise is expected to increase such erosion by allowing stronger waves on neighboring tidal flats due to raised water depth. While a healthy marsh can recover the lost land via plants recolonizing the bare tidal flats, waves enhanced by sea level rise can greatly slow down or even block such recovery by hampering seed establishment. “A few cm increase of wave height can double the time needed for vegetation recovery on the tidal flats”, says Zhenchang Zhu, the leading author of this paper, who conducted this research at NIOZ, but is currently working at Guangdong University of technology, China. “This is problematic as sea level rise may speed up marsh erosion meanwhile limiting its recovery. In the long run, this can cause big loss in marsh extent and key ecosystems services humans rely on, such as coastal defense”, Zhu continues.

Good neighbors make healthy marshes

How to improve marsh health and coastal safety under sea level rise? “The key is to manage their neighbors: the tidal flats”, Zhu adds. Habitats at lower tidal elevations (e.g. tidal flats) do not make a direct contribution for flood defense, yet they affect the stability of ecosystems at higher tidal elevations (e.g. saltmarshes) that directly protect the coast against wave attacks. When harnessing saltmarshes as natural flood defense, it is important to maintain well elevated tidal flats for ensuring stable marshes and thus safer coasts. This may be achieved by e.g. supplying dredging materials to keep a sufficiently high elevation or by e.g. restoring shellfish reef ecosystems (e.g. oyster reefs and mussel beds) that limit wave formation on the tidal flat. Such measures are beneficial for quick vegetation recovery after marsh edge erosion to support healthy marshes. “Overall this research teaches us that with good management of our tidal flats, we can preserve wide wave-attenuating marshes, and hence continue to benefit from their value for flood defense”, says Zhenchang Zhu.

###

Photos on request:

1. Seaward marsh edge. Photo from Zhenchang Zhu

2. An eroded marsh with vegetation recovery on the neighboring tidal flat. Photo from Zhenchang Zhu

Article

Zhu, Z. , van Belzen, J. , Zhu, Q. , van de Koppel, J. and Bouma, T. J. (2019), Vegetation recovery on neighboring tidal flats forms an Achilles’ heel of saltmarsh resilience to sea level rise. Limnol Oceanogr. doi:10.1002/lno.11249

More information

  • Zhenchang Zhu, E: [email protected]
  • Jim van Belzen, E: [email protected]
  • Johan van de Koppel, E: [email protected]
  • Tjeerd.J.Bouma, E: [email protected]

Media Contact
Zhenchang Zhu
[email protected]

Related Journal Article

http://dx.doi.org/10.1002/lno.11249

Tags: BiologyBiomechanics/BiophysicsClimate ChangeMarine/Freshwater BiologyOceanographyPlant SciencesWeather/Storms
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