Abstract. This research aimed to assess the tsunami flow velocity and height
reduction produced by a planned elevated road parallel to the coast
of Banda Aceh, called the Banda Aceh Outer Ring Road (BORR). The road will
transect several lagoons, settlements, and bare land around the coast of
Banda Aceh. Beside its main function to reduce traffic congestion in the
city, the BORR is also proposed to reduce the impacts of future tsunamis. The Cornell
Multi-grid Coupled Tsunami Model (COMCOT) was used to simulate eight
scenarios of the tsunami. One of them was based on the 2004 Indian Ocean
tsunami. Two magnitudes of earthquake were used, that is, 8.5 and
9.15 Mw. Both the earthquakes were generated from the same
source location as in the 2004 case, around the Andaman Sea. Land use data of
the innermost layer of the simulation area were adopted based on the 2004
condition and the land use planning of the city for 2029. The results of this
study reveal that the tsunami inundation area can be reduced by about 9 %
by using the elevated road for the earthquake of magnitude 9.15 Mw and
about 22 % for the earthquake of magnitude 8.5 Mw. Combined with
the land use planning 2029, the elevated road could reduce the maximum flow
velocities behind the road by about 72 %. Notably, the proposed land use
for 2029 will not be sufficient to deliver any effects on the tsunami
mitigation without the elevated road structures. We recommend the city to
construct the elevated road as this could be part of the co-benefit
structures for tsunami mitigation. The proposed BORR appears to deliver a significant reduction of impacts of the smaller intensity tsunamis compared
to the 2004 Indian Ocean tsunami.