Simplifed formulae for designing coastal forest against tsunami run up: one dimensional approach


Nguyen Ba Thuy1  · N. A. K. Nandasena2  · Vu Hai Dang3  · Norio Tanaka4

 

1 Vietnam National Hydrometeorological Forecasting Center, No 8 Phao Dai Lang,

Dong Da, Hanoi, Vietnam

2 Department of Civil and Environmental Engineering, Faculty of Engineering,

University of Auckland, Private Bag 92019, Auckland 1142, New Zealand

3 Institute of Marine Geophysics and Geology, 18 Hoang Quoc Viet, Cau Giay,

 Hanoi, Vietnam

4 Graduate School of Science and Engineering, Saitama University,

255 Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan

 

Abstract

       In the present study, laboratory experiments were conducted to validate the applicability of a numerical model based on one-dimensional nonlinear long-wave equations. The model includes drag and inertia resistance of trees to tsunami fow and porosity between trees and a simplifed forest in a wave channel. It was confrmed that the water surface elevation and fow velocity by the numerical simulations agree well with the experimental results for various forest conditions of width and tree density. Further, the numerical model was applied to prototype conditions of a coastal forest of Pandanus odoratis‑ simus to investigate the efects of forest conditions (width and tree density) and incident tsunami conditions (period and height) on run-up height and potential tsunami force. The modeling results were represented in curve-ft equations with the aim of providing simplifed formulae for designing coastal forest against tsunamis. The run-up height and potential tsunami forces calculated by the curve-ft formulae and the numerical model agreed within ± 10% error.

 

        Keywords Tsunami run-up · Coastal forest · Pandanus odoratissimus · Tsunami force

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