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FLOW AND POTENTIAL FORCE DUE TO RUNUP TSUNAMI AROUND A COASTAL FOREST WITH A GAP – EXPERIMENTS AND NUMERICAL SIMULATIONS

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Author(s): Nguyen Ba Thuy | Katsutoshi Tanimoto | Norio Tanaka

Journal: Science of Tsunami Hazards
ISSN 8755-6839

Volume: 29;
Issue: 2;
Start page: 43;
Date: 2010;
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Keywords: Runup tsunami | Coastal forest | Gap | Pandanus odoratissimus | Tsunami force.

ABSTRACT
In the present study, laboratory experiments were conducted to validate the applicability of numerical model based on two-dimensional nonlinear long-wave equations including drag resistance of trees and turbulence induced shear forces to tsunami flow around a simplified forest with a gap in a wave channel. It was confirmed that the water surface elevation and flow velocity by the numerical simulations agree well with the experimental results for various forest conditions of width and tree density. Then the numerical model was applied to a prototype scale condition of a coastal forest of Pandanus odoratissimus with a gap to investigate the effects of forest conditions (width and tree density) and incident tsunami conditions (period and height) on a potential tsunami force. The potential tsunami force at the gap exit is greatly enhanced and the maximum in the spatial distribution around and inside the forest. The potential tsunami forces at four representative points at front and back of forest including the center of gap exit were analyzed for various conditions and formulated as function of forest and tsunami conditions in the non-dimensional form. The potential tsunami forces calculated by the curve-fit formula agree well with the simulated potential tsunami forces within ±10% error.
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