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The city of Lhokseumawe in Aceh is mostly located on the coast and is vulnerable to annual tidal waves, causing coastal settlements to sink. The rising sea levels in Indonesia, as observed by the IPCC using the TOPEX/POSEIDEN satellite, have reached 7 mm/year. A study was conducted to assess the impact of tidal waves exacerbated by sea level rise on changes in coastal morphology over 25 and 50 years. The study utilized the Delft3D numerical simulation method with various input data such as Topographic Data, bathymetry, tides, discharge, sediment, and waves. The results of the Delft3D modeling showed that erosion is slightly greater in the 25 and 50-year scenarios, with an average minimum erosion of about 12 m and a maximum erosion and retreat of about 18 m. However, in the 50-year scenario, there were points along the coast where sedimentation occurred, leading to the advancement of the coastline by about 36 m. These dynamic morphological changes in the coastal area of Lhokseumawe highlight the need for a coastal protection plan to address this vulnerability.

Lhokseumawe City, one of the cities in Aceh, is situated close to a body of water with an area of 181.06 km 2 . Being in a coastal area, the city is highly susceptible to tidal flooding. The worst tidal flood in the area occurred on 26 May 2021, causing significant damage to residential areas. This study focuses on assessing the impact of sea level rise on the extent of tidal flood inundation and its consequences for residential areas along the coast of Lhokseumawe City. The analysis utilizes numerical modeling simulation carried out with the Delft3D application, specifically Delft3D-FLOW and Delft3D-WAVE. Data is input at several stages to model the inundation, resulting in the production of images, graphs, and animations. Three scenarios are considered for the inundation modeling: existing tidal flood conditions, a 25-year scenario, and a 50-year scenario. The simulation revealed extensive inundation under all scenarios, with the existing conditions covering 402,174 m 2 , the 25-year scenario covering 579,860 m 2 , and the 50-year scenario covering 737,188 m 2 in the coastal area of Lhokseumawe City. Tidal floods, caused by extreme tidal waves, resulted in the flooding of numerous buildings along the city’s coast due to their high population density. The expanding inundation area poses a significant threat to the economy, especially to those whose livelihoods depend on the tourism sector. Serious measures are imperative to mitigate the expansion of the inundation area and its adverse economic impacts.

The analysis of the dynamic bearing capacity of pile foundations is an important aspect of understanding the interaction between structures and soil. This study aims to determine the pile bearing capacity based on data from the Standard Penetration Test (SPT) and Cone Penetration Test (CPT), which were verified using the results from the Pile Driving Analyzer (PDA) test. The static analysis methods applied in this study include those developed by Meyerhof (1976), Vesic (1977), de Ruiter and Beringen (1979), and Penpile (1978). The results of the static analysis of pile bearing capacity are consistent with the PDA test results. These findings demonstrate that the PDA test is a valid and reliable reference for evaluating pile bearing capacity in the field. The analysis results using the de Ruiter and Beringen method with CPT data show a very close correlation with the pile capacity obtained from the PDA test. Meanwhile, the analysis results using the Vesic and Meyerhof methods with SPT data are slightly closer to the PDA test results. These methods are consired appropriate in pile bearing capacity analysis, as they consistently produce capacity values that fall within the range of those obtained from the PDA test.