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The massive tsunami of December 26, 2004 has had a huge impact on the life of the coastal region. The effects of the tsunami caused damage to occupation settlements, loss of waterside land and destruction of marine biota ecosystems. The coastal region of Aceh Province in Indonesia is the area that has the worst impact followed by the State of Malaysia, Thailand and as a coastal area of India. As a result of a large amount of coastal land experiencing a loss of land mass, erosion is very significant. As a step towards handling coastal areas from greater erosion prevention, the Government of Indonesia in 2005 adopted a policy of handling rehabilitation and reconstruction through the ANTERP (Aceh Nias Tsunami and Earthquake Response Program) program under the BRR (Rehabilitation and Reconstruction Agency) in collaboration with Ministry of Public Work. One of the steps to handling erosion is to protect the coast using the hard structure method such as the construction of a revetment and jetty made from rock armor. This study aims to assess the level of damage and priority of handling of coastal protective structures that have been built in 2009, 2016 and how changes in shoreline occur on the beach location of Alue Naga - Neuheun, which is a coastal area that was greatly affected by the tsunami. Assessments were carried out in three different coastal structures, namely CS-1 locations in the Alue Naga area, CS-2, Lambada Lhok coastal area and CS-3 Neuheun beach area. Guidelines for assessing structure damage and changes in shoreline in the study using the Ministry of Public Work Regulation No. 08/SE/M/2010. The rate of change in shoreline is obtained through computational calculations of the DSAS (Digital Shoreline Analysis System) program using the EPR (End Point Rate) method and NSM for change distance (Net Shoreline Movement).

Abstract. Regional seismic risk assessment is paramount in
earthquake-prone areas, for instance, to define and implement prioritisation
schemes for earthquake risk reduction. As part of the Indonesia School Programme to Increase Resilience (INSPIRE), this paper
proposes an ad hoc rapid-visual-survey form, allowing one to (1) calculate the
newly proposed INSPIRE seismic risk prioritisation index, which is an
empirical proxy for the relative seismic risk of reinforced concrete (RC)
buildings within a given building portfolio; (2) calculate the Papathoma
Tsunami Vulnerability Assessment (PTVA) index, in any of its variations; (3) define one or more archetype buildings representative of the analysed
portfolio; (4) derive detailed numerical models of the archetype buildings,
provided that the simulated design is used to cross-check the model assumptions.
The proposed INSPIRE index combines a baseline score, calibrated based on
fragility curves, and a performance modifier, calibrated through the
analytic hierarchy process (AHP) to minimise subjectivity. An attempt to
define a multi-hazard prioritisation scheme is proposed, combining the
INSPIRE and PTVA indices. Such a multi-level framework is implemented for 85
RC school buildings in Banda Aceh, Indonesia, the most affected city by
the 2004 Indian Ocean earthquake–tsunami sequence. As part of the proposed
framework, two archetype buildings representative of the entire portfolio
are defined based on the collected data. Their seismic performance is
analysed by means of non-linear static analyses, using both the analytical
simple lateral mechanism analysis (SLaMA) method and numerical finite-element pushover analyses to investigate the expected plastic mechanisms and
derive displacement/drift thresholds to define appropriate damage states.
Finally, non-linear dynamic analyses are performed to derive fragility
curves for the archetype buildings. This paper demonstrates the
effectiveness of the INSPIRE data collection form and proposed index in
providing a rational method to derive seismic risk prioritisation schemes
and in allowing the definition of archetype buildings for more detailed
evaluations/analyses.