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

Author

Listed:
  • Nguyen Ba Thuy

    (Vietnam National Hydrometeorological Forecasting Center)

  • N. A. K. Nandasena

    (University of Auckland)

  • Vu Hai Dang

    (Institute of Marine Geophysics and Geology)

  • Norio Tanaka

    (Saitama University)

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 flow and porosity between trees and a simplified forest 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. Further, the numerical model was applied to prototype conditions of a coastal forest of Pandanus odoratissimus to investigate the effects 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-fit equations with the aim of providing simplified formulae for designing coastal forest against tsunamis. The run-up height and potential tsunami forces calculated by the curve-fit formulae and the numerical model agreed within ± 10% error.

Suggested Citation

  • Nguyen Ba Thuy & N. A. K. Nandasena & Vu Hai Dang & Norio Tanaka, 2018. "Simplified formulae for designing coastal forest against tsunami run-up: one-dimensional approach," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 92(1), pages 327-346, May.
    • Handle: RePEc:spr:nathaz:v:92:y:2018:i:1:d:10.1007_s11069-018-3197-z
    DOI: 10.1007/s11069-018-3197-z
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