Numerical simulations of tsunami waves impacts on Ulee Lheue Harbour in Banda Aceh-Indonesia

Abstract

This paper reports the effects of 2004 Indian Ocean tsunami onto the Ulee Lheue harbour facility, Banda Aceh - Indonesia. The breakwater that had damaged after tsunami were rebuilt into its original design once more due to UNDP funding source. As the existing construction knowing how much the chance it stands againts the tsunami in various terms would be decent for further improvement. This research aim is to measure the capabilities of the breakwater againts the various tsunami scenario. performing the numerical simulation to analyze the hydrodynamics we used both COMCOT and Delft3D-flow for tsunami propagation in line with the hydrodynamics. Several observation points were deployed representing each part of the breakwater. The process revealed that the breakwater only able to hold 8.0 Mw induced wave from overtopping. uniquely when 8.2 Mw tsunami wave strikes the breakwater till overtopped but not giving enough energy to move the boulder aside. Potential movement of the boulder occurred when the 8.4 Mw tsunami wave come through the breakwater produced 77.12 m (5.88 %) damaged structure. The 8.6 Mw single fault highest magnitude gave 209.32 m long (15.97%) destruction upon this Ulee Lheue Harbour breakwater.