Wave attenuation in mangrove forests: field data obtained in Trang, Thailand

Erik Horstman, Marjolein Dohmen-Janssen, Pedro Narra, Niels-Jasper van den Berg, Martijn Siemerink, Thorsten Balke, Tjeerd Bouma, Suzanne J.M.H. Hulscher

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

23 Citations (Scopus)
159 Downloads (Pure)


Mangroves thrive in sheltered intertidal areas in the tropics and sub-tropics. Due to this position at the interface between land and sea, mangroves play an important role in the attenuation of waves. Dissipation of wave energy in mangrove forests is an interesting feature from the viewpoint of coastal protection. Nevertheless, field data are sparse and modeling attempts reveal the need for additional data. This paper presents the results of an extensive field campaign, lasting 6 months, in mangroves along the Andaman coast of Trang Province in southern Thailand. Wave attenuation has been studied along two contrasting transects with different elevation and vegetation characteristics and different orientations towards the Andaman Sea. Along the Kantang transect, which is mostly exposed to swell waves, vegetation densities increased from 4.5 to 9.3 volume-‰ along the transect and on average 63% of the incident wave energy was attenuated over a distance of 246 m. Along the Palian transect, mostly exposed to sea waves instead, vegetation increased from 4.3 to 19 volume-‰ and 72% of the incident wave energy was attenuated over this 98 m transect. It was found that standardized wave attenuation correlates well with incident wave energy, when attenuation is analyzed per vegetation zone. Energy reduction rates of these zones, defined by the gradient of the correlations between the standardized wave attenuation and incident wave energy, are found to increase significantly with vegetation density. Consistently, wave reduction rates, expressing the gradient of the correlation between wave height reduction and incident wave heights, are found to be 0.001-0.014 for the study sites and also show a significant and increasing trend with vegetation densities.
Original languageEnglish
Title of host publicationCoastal Engineering 2012
Subtitle of host publicationProceedings of 33rd International Conference on Coastal Engineering (ICCE), 1-6 July 2012, Santander, Spain
EditorsPatrick Lynett, Janet McKee Smith
PublisherCoastal Engineering Research Council
Number of pages15
ISBN (Print)978-0-9896611-1-9
Publication statusPublished - 2012
Event33rd International Conference on Coastal Engineering, ICCE 2012 - Santander, Spain
Duration: 1 Jul 20126 Jul 2012
Conference number: 33


Conference33rd International Conference on Coastal Engineering, ICCE 2012
Abbreviated titleICCE


  • IR-84816
  • METIS-290726


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