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Wave Attenuation by Wetland Vegetations

Anuar, Aidil Ass'ad (2007) Wave Attenuation by Wetland Vegetations. Universiti Teknologi PETRONAS. (Unpublished)

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Abstract

Wave attenuation by wetland vegetation is a concept that uses plants and vegetation instead of hard structures such as breakwaters, revetments or seawalls to dissipate the wave energy. The usage of hard structures has been proven to be obstructive and hazardous to the local enviromnent either during the construction or even after the completion of the structures. Another alternative which is more eco friendly and less obstructive is by using vegetation as wave attenuators. The objective of this study is to determine the level of effectiveness of the vegetations in attenuating waves. Another objective of the study is to find a suitable species that will survive in the climate conditions in Malaysia and will have the similar effect on wave attenuation as other species that have been tested before. For the first semester, the concept was studied by using previous researches on the effects of other plants located in countries which have different weather conditions and climate compared to Malaysia. The study was continued the following semester where experiments have been carried out using a wave flume and the determination of the attenuation effect by the mangrove model is based on the Transmission coefficient, C, The values that were evaluated were the Incident Wave Height, Hi, actual wave height, H and wave period, T. The variable parameters used in the experiment to determine the transmission coefficient, C1, were wave period, water depth and the number of mangrove beds. The experiment was done by using mangrove beds, comprising of 100 bamboo sticks with a diameter of 2mm placed in a 300 mm x 200 mm concrete bed placed in the wave flume. The initial wave height and actual wave height was compared .. The initial testing shows that the mangrove model is capable of attenuating up to 40 % of the wave height in various depths thus showing that the concept is practical in wave attenuation. Shallow water depth, low wave period and higher number of the mangrove model beds show a higher reduction in transmission coefficient. Throughout the experiments done and after analyzing the results, it can be concluded that wetland vegetation has the capability of attenuating wave energy even though it is not as effective as hard structures

Item Type: Final Year Project
Academic Subject : Academic Department - Civil Engineering - Geotechnic and highway
Subject: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Engineering > Civil
Depositing User: Users 2053 not found.
Date Deposited: 24 Oct 2013 14:50
Last Modified: 25 Jan 2017 09:45
URI: http://utpedia.utp.edu.my/id/eprint/9730

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