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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Spatial differences of wave energy dissipation in the mangrove forests along the south china sea
Spatial differences of wave energy dissipation in the mangrove forests along the south china sea
Author : HAIJIN CAO(1,2), YUJUN CHEN(3), MARCEL J.F. STIVE(2), WEIBING FENG(1)
ABSTRACT
This study investigates the buffering effect on ocean wave energy due to the coastal mangrove forests of the South China
Sea on the basis of field measurement data, which are collected from two different sites under different tidal levels and
wave climate. The intention of this paper is to find out the exact wave damping rate with the presence of mangroves, to
figure out the results due to spatial distinction and the reasons of that. The measured sites named Lianhua Shan in
Panyu and Leizhou Bay were chosen for their representative characteristics------therein the pass-by tropical storms
usually stir up onshore and offshore wind. Wave gauges were mounted in line perpendicular to the coastline to record the
time history of surface displacement synchronously during certain time periods. The data analysis indicates that both
sites witness prominent wave damping, and coupled with bottom friction after 100 meters the measured maximum
dissipation rate of wave height reaches 80%. Wave energy spectrum analysis is done as well to show the differences in
energy dissipation under different water levels. Further insight into the wave damping rate manifests that spatial
difference is significant particularly during the typhoon period due to its position relative to the storm route. What¡¯s more,
examining the spectral wave energy dissipation pattern tells that water depth is a determinant factor to the spectrum
shape and the dissipation capability of vegetation is distinct at different frequencies. Serving as natural coastal protection
schemes, mangrove forests effectively mitigate the coastal hydrodynamics and reversely are greatly affected by
hydrodynamics, contributing to an interactional stable aquatic ecosystem. Nevertheless, each specific location has its
own proper features.
File Size : 193,555 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 20/08/2015
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