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[P-36] Investigating Planned Elevated Road for Mitigating Impacts of Tsunami on Banda Aceh, IndonesiaInvestigating Planned Elevated Road for Mitigating Impacts of Tsunami on Banda Aceh, Indonesia

*Syamsidik Syamsidik^1,3, Tursina Tursina^1,3, Anawat Suppasri² (1. Tsunami and Disaster Mitigation Research Center (TDMRC) of Universitas Syiah Kuala, Banda Aceh-Indonesia, 2. International Research Institute of Disaster Science (IRIDeS) of Tohoku University, Japan, 3. Civil Engineering of Universitas Syiah Kuala, Banda Aceh-Indonesia)

Keywords:tsunami, mitigation, numerical simulations, elevated road

A tsunami multi-layer defense system applied in Sendai plain after the 2011 Great East Japan Earthquake and Tsunami is one of recent advanced mitigation measures. However, it was noted that applying giant seawalls could be beyond financial capacity for some tsunami-prone cities in Indonesia. On the other hand, the needs for long-term tsunami mitigation measures are urgent for a city like Banda Aceh that was once severely destroyed by the 2004 Indian Ocean Tsunami. This research is aimed at investigating the co-benefit uses of a road transect to reduce tsunami wave energy. Here, we used numerical simulations to investigate the potential uses of a planned Banda Aceh Outer Ring Road (BORR), which will be parallel to its coastline. We used Cornell Multi Grid Coupled tsunami Model (COMCOT) for a series of numerical simulations. Validations of the models were done using the 2004 tsunami sources and flow depths data. Two earthquake magnitudes were used, namely 8.5 Mw and 9.15 Mw. With the elevated road, it can potentially reduce the tsunami flow depths about 9% in the case of 9.15 Mw and about 22% for the case of 8.5 Mw earthquak. Also, the elevated road could reduce tsunami inundation area and speed.