International Session 国際セッション (4)

[CS2-34] PHYSICAL MODELING OF TSUNAMI FLOW THROUGH DISCONTINUOUS VEGETATION

*Naveed Anjum¹、Norio Tanaka¹ (1. Graduate School of Science & Engineering, Saitama University, Japan)

Keywords:Tsunami, Flow structure, Vegetation, Backwater rise, Energy loss

Laboratory experiments were performed through emergent vegetation of discontinuous (patch type) pattern with different water depths under subcritical condition. The water surface was raised in the upstream region of forest models (FMs), causing a steep water surface slope within FM regions, which resulted in reduction of inundating flow depth downstream of the FMs. Each FM contributed to the loss in energy by creating water level differences upstream and downstream of the FMs. The overall energy loss for both upstream and downstream FMs was observed to be 29-36%. The study found that the energy of the inland tsunami flow can significantly be reduced by the discontinuous forests as a defense system.