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Parameterization of Mangrove Root Structure of Rhizophora stylosa in Coastal Hydrodynamic Model

Nobuhito Mori, Che-Wei Chang, Tomomi Inoue, Yasuaki Akaji, Ko Hinokidani, Shigeyuki Baba, Masashi Takagi, Sotaro Mori, Hironoshin Koike, Miho Miyauchi, Ryosuke Suganuma, Audrius Sabunas, Takuya Miyashita, Tomoya Shimura

Frontiers in Built Environment, Volume: 7, Start page: 782219

Swansea University Author: Nobuhito Mori

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    © 2022 Mori, Chang, Inoue, Akaji, Hinokidani, Baba, Takagi, Mori, Koike, Miyauchi, Suganuma, Sabunas, Miyashita and Shimura. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY)

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DOI (Published version): 10.3389/fbuil.2021.782219

Abstract

Mangroves are able to attenuate tsunamis, storm surges, and waves. Their protective function against wave disasters is gaining increasing attention as a typical example of the green infrastructure/Eco-DRR (Ecosystem-based Disaster Risk Reduction) in coastal regions. Hydrodynamic models commonly empl...

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Published in: Frontiers in Built Environment
ISSN: 2297-3362
Published: Frontiers Media SA 2022
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa59236
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Abstract: Mangroves are able to attenuate tsunamis, storm surges, and waves. Their protective function against wave disasters is gaining increasing attention as a typical example of the green infrastructure/Eco-DRR (Ecosystem-based Disaster Risk Reduction) in coastal regions. Hydrodynamic models commonly employed additional friction or a drag forcing term to represent mangrove-induced energy dissipation for simplicity. The well-known Morison-type formula (Morison et al. 1950) has been considered appropriate to model vegetation-induced resistance in which the information of the geometric properties of mangroves, including the root system, is needed. However, idealized vegetation configurations mainly were applied in the existing numerical models, and only a few field observations provided the empirical parameterization of the complex mangrove root structures. In this study, we conducted field surveys on the Iriomote Island of Okinawa, Japan, and Tarawa, Kiribati. We measured the representative parameters for the geometric properties of mangroves, Rhizophora stylosa, and their root system. By analyzing the data, significant correlations for hydrodynamic modeling were found among the key parameters such as the trunk diameter at breast height (DBH), the tree height H, the height of prop roots, and the projected areas of the root system. We also discussed the correlation of these representative factors with the tree age. These empirical relationships are summarized for numerical modeling at the end.
Keywords: mangrove, prop roots, Rhizophora stylosa, root structure, parameterization
College: Faculty of Science and Engineering
Funders: This research was supported by the Environment Research and Technology Development Fund JPMEERF20172012 and the Climate Adaptation Program in NIES and JSPS Grant-in-Aid for Scientific Research (Kakenhi) 20KK0095, and JST/JICA SATREPS Indonesia
Start Page: 782219

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