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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Managing deltas : Coastal mangrove squeeze in the mekong delta
Coastal mangrove squeeze in the mekong delta
Author : PHAN KHANH LINH(1), JAAP S.M. VAN THIEL DE VRIES(2) & MARCEL J.F STIVE(3)
ABSTRACT
The root, stem and canopy structure of mangrove forests create an extremely efficient system in attenuating waves and
currents. Mangroves are therefore known as a natural system for coastline protection against flooding and erosion.
However, mangroves degradation and associated coastline erosion are frequently observed along the Mekong Delta
coast, one of the largest mangroves area in the word. The southeastern and eastern Mekong Delta coast are now
hosting many sea dikes constructed to extend agri- and aqua-cultivation areas. Although the intention has been to
improve the conditions of the Mekong Delta population to improve their life, it causes mangrove squeeze along the
coastline. The basic assumption behind our work is that there is a critical minimum width of a coastal mangrove forest
strip to keep its ability to stay stable or, once surpassing the minimum width, to promote sedimentation. Our research
based on both literature and satellite data shows that an average width of 140 meters of mangrove forest is necessary
for a healthy mangrove forest state along the southeastern and the eastern Mekong Delta coast. We are using a state of
the art wave propagation model that includes both short and long waves to analyze wave attenuation as a function of
mangroves width. Our results show that short waves are attenuated very quickly even before they can reach the critical
width of the mangrove forest. Infragravity waves however penetrate over much larger distance. We therefore hypothesize
that long wave attenuation will be the major factor of influence to the health of a mangrove forest.
File Size : 602,730 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Managing deltas
Date Published : 20/08/2015
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