Assessing the tsunami mitigation effectiveness of a planned Banda Aceh Outer Ring Road (BORR), Indonesia

Abstract

Abstract. This research aimed to assess the tsunami flow velocity and height reduction produced by a planned elevated road spanned parallel to the coast of Banda Aceh called Banda Aceh Outer Ring Road (BORR). 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 flow depths and flow velocities can be reduced by about 9 % by using the elevated road for earthquake magnitude 9.15 Mw and about 22 % for earthquake 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 significant reduction of impacts in the smaller intensity tsunamis compared to the 2004 Indian Ocean tsunami.

Study of vulnerability three-story school buildings with reinforced concrete construction in Banda Aceh to earthquake and tsunami hazards

“…The displacement is obtained by entering the load on the column structure with a height as high as the depth of the tsunami flow, for each building, namely the private junior high school of Budi Dharma (Sekolah Budi Dharma) with a flow depth of 1.8 meters, the elevation of the base of the building to the water level elevation as high as 2 meters and for the national elementary school 50 (SD Negeri 50) with a flow depth of 2.6 meters, the elevation of the base of the building to the water level as high as 2 meters, the height is taken according to the sub-district because the school area was not hit by the tsunami, only entered the height to show the condition of the school building if it was hit by a tsunami disaster. After that, an analysis was carried out on SAP2000 v.20 to compare the height of the tsunami with the probability of the fragility curve that was developed (the vulnerability curve of the Volcanogenic tsunami of Mount Anak Krakatau, research by Syamsidik, et al [11] on the two typical school buildings.…”

Fluvial and coastal landform changes in the Aceh River delta (northern Sumatra) during the century leading to the 2004 Indian Ocean tsunami

“…Time‐series of sediment flux measurements have been used to feed numerical models and sandbox experiments of delta growth, aimed at assisting delta restoration projects and coastal management (Allison et al, 2012; Hijma et al, 2017; Paola et al, 2011; Syamsidik et al, 2019). But in deltas such as that of the Aceh River, written records and monitoring datasets are either classified or non‐existent, and the time‐depth of the instrumental record is very shallow.…”

Tsunami Risk Assessment in Business Continuity Planning for Palu Special Economic Zone

“…Thus, mitigation plans are urgently needed to reduce damage and losses due to the impact of future tsunamis on PSEZ. There have been many studies focusing on reducing the impact of future tsunami such as tsunami hazard assessment, tsunami countermeasures, and development of tsunami early warning system [3,4,5]. However, this study assesses the impact of tsunamis around the PSEZ through the development of ABCP Strategy that can assist stakeholders in implementing areawide business continuity management (ABCM).…”