摘要：This research aimed to assess the tsunami flow velocity and heightreduction produced by a planned elevated road parallel to the coastof Banda Aceh, called the Banda Aceh Outer Ring Road (BORR). The road willtransect several lagoons, settlements, and bare land around the coast ofBanda Aceh. Beside its main function to reduce traffic congestion in thecity, the BORR is also proposed to reduce the impacts of future tsunamis. The CornellMulti-grid Coupled Tsunami Model (COMCOT) was used to simulate eightscenarios of the tsunami. One of them was based on the 2004 Indian Oceantsunami. Two magnitudes of earthquake were used, that is, 8.5 and9.15Mw. Both the earthquakes were generated from the samesource location as in the 2004 case, around the Andaman Sea. Land use data ofthe innermost layer of the simulation area were adopted based on the 2004condition and the land use planning of the city for 2029. The results of thisstudy reveal that the tsunami inundation area can be reduced by about 9%by using the elevated road for the earthquake of magnitude 9.15Mw andabout 22% for the earthquake of magnitude 8.5Mw. Combined withthe land use planning 2029, the elevated road could reduce the maximum flowvelocities behind the road by about 72%. Notably, the proposed land usefor 2029 will not be sufficient to deliver any effects on the tsunamimitigation without the elevated road structures. We recommend the city toconstruct the elevated road as this could be part of the co-benefitstructures for tsunami mitigation. The proposed BORR appears to deliver a significant reduction of impacts of the smaller intensity tsunamis comparedto the 2004 Indian Ocean tsunami.
