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Determination of mangrove forest performance in reducing tsunami run-up using physical models

Coastal ecosystems such as mangroves fringing tropical coastlines have been recognized as natural protectors of the coastal areas against destructive attack of a tsunami. In this paper, the authors aim to investigate the interaction of a tsunami wave on a typical mangrove forest and to determine its...

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Main Authors: Ismail, H., Abdul Wahab, Ahmad Khairi, Alias, Nor Eliza
Format: Article
Published: Springer 2012
Subjects:
TA Engineering (General). Civil engineering (General)
Online Access:http://eprints.utm.my/id/eprint/33439/
http://dx.doi.org/10.1007/s11069-012-0200-y
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spelling my.utm.334392018-11-30T06:35:26Z http://eprints.utm.my/id/eprint/33439/ Determination of mangrove forest performance in reducing tsunami run-up using physical models Ismail, H. Abdul Wahab, Ahmad Khairi Alias, Nor Eliza TA Engineering (General). Civil engineering (General) Coastal ecosystems such as mangroves fringing tropical coastlines have been recognized as natural protectors of the coastal areas against destructive attack of a tsunami. In this paper, the authors aim to investigate the interaction of a tsunami wave on a typical mangrove forest and to determine its performance in reducing the run-up. A laboratory experiment using a hydraulic ?ume with a mangrove forest model was carried out in which tests were conducted by varying the vegetation widths of 0, 1, 2 and 3 m and average densities of 8, 6 and 4 trees per 100 cm2 using a scale ratio of 1:100. Two conditions of water levels were considered in the experiments at several tsunami wave heights between 2.4 and 14 cm. The dam break method used in the experiments produced two types of waves. At low water condition, a bore was developed and subsequently, a solitary wave was produced during high water. The results of the experiments showed that in general, vegetation widths and densities demonstrate a dampening effect on tsunami run-up. A larger vegetation width was found to be more effective in dissipating the wave energy. The ?rst 1 m width of mangrove forest could reduce 23–32 % during high water and 31–36 % during low water. Increasing the mangrove forest width to 2 and 3 m could further increase the average percentage of run-up reduction by 39–50 % during high water and 34–41 % during low water condition. It was also observed that densities of the mangrove forest do not in?uence the run-up reduction as signi?cantly as the forest widths. For mangrove forest densities to be signi?cantly enough to reduce more tsunami run-up, an additional density of 4 trees/100 m2 needs to be provided. The experiments also showed that mangrove roots are more effective in reducing the run-up compared to the trunks and canopies. The experiments managed to compare and present the usefulness of mangrove forests in dissipating wave energy and results produced are bene?cial for initiating design guidelines in determining setback limits or buffer zones for development projects in mangrove areas. Springer 2012-09 Article PeerReviewed Ismail, H. and Abdul Wahab, Ahmad Khairi and Alias, Nor Eliza (2012) Determination of mangrove forest performance in reducing tsunami run-up using physical models. Natural Hazards, 63 (2). pp. 939-963. ISSN 0921-030X http://dx.doi.org/10.1007/s11069-012-0200-y DOI:10.1007/s11069-012-0200-y
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
topic TA Engineering (General). Civil engineering (General)
spellingShingle TA Engineering (General). Civil engineering (General)
Ismail, H.
Abdul Wahab, Ahmad Khairi
Alias, Nor Eliza
Determination of mangrove forest performance in reducing tsunami run-up using physical models
description Coastal ecosystems such as mangroves fringing tropical coastlines have been recognized as natural protectors of the coastal areas against destructive attack of a tsunami. In this paper, the authors aim to investigate the interaction of a tsunami wave on a typical mangrove forest and to determine its performance in reducing the run-up. A laboratory experiment using a hydraulic ?ume with a mangrove forest model was carried out in which tests were conducted by varying the vegetation widths of 0, 1, 2 and 3 m and average densities of 8, 6 and 4 trees per 100 cm2 using a scale ratio of 1:100. Two conditions of water levels were considered in the experiments at several tsunami wave heights between 2.4 and 14 cm. The dam break method used in the experiments produced two types of waves. At low water condition, a bore was developed and subsequently, a solitary wave was produced during high water. The results of the experiments showed that in general, vegetation widths and densities demonstrate a dampening effect on tsunami run-up. A larger vegetation width was found to be more effective in dissipating the wave energy. The ?rst 1 m width of mangrove forest could reduce 23–32 % during high water and 31–36 % during low water. Increasing the mangrove forest width to 2 and 3 m could further increase the average percentage of run-up reduction by 39–50 % during high water and 34–41 % during low water condition. It was also observed that densities of the mangrove forest do not in?uence the run-up reduction as signi?cantly as the forest widths. For mangrove forest densities to be signi?cantly enough to reduce more tsunami run-up, an additional density of 4 trees/100 m2 needs to be provided. The experiments also showed that mangrove roots are more effective in reducing the run-up compared to the trunks and canopies. The experiments managed to compare and present the usefulness of mangrove forests in dissipating wave energy and results produced are bene?cial for initiating design guidelines in determining setback limits or buffer zones for development projects in mangrove areas.
format Article
author Ismail, H.
Abdul Wahab, Ahmad Khairi
Alias, Nor Eliza
author_facet Ismail, H.
Abdul Wahab, Ahmad Khairi
Alias, Nor Eliza
author_sort Ismail, H.
title Determination of mangrove forest performance in reducing tsunami run-up using physical models
title_short Determination of mangrove forest performance in reducing tsunami run-up using physical models
title_full Determination of mangrove forest performance in reducing tsunami run-up using physical models
title_fullStr Determination of mangrove forest performance in reducing tsunami run-up using physical models
title_full_unstemmed Determination of mangrove forest performance in reducing tsunami run-up using physical models
title_sort determination of mangrove forest performance in reducing tsunami run-up using physical models
publisher Springer
publishDate 2012
url http://eprints.utm.my/id/eprint/33439/
http://dx.doi.org/10.1007/s11069-012-0200-y
_version_ 1643649331603963904
score 13.211869

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