This paper uses a raster-based inundation model (LISFLOOD-FP) to simulate coastal flooding using the major causes of coastal inundation i.e. extreme water levels and subsidence combined with rising sea level. Specifically, this study uses sea level scenarios through 2050, projected by linear estimation of the Semarang tide gauge record from 1997 to 2015. In addition, we calculated extreme water levels along Semarang, Indonesia, using the modern extreme value theory introduced by Gumbel (1958) and Jenkinson (1955). Simulations of coastal flooding show that subsidence in Semarang may be the leading reason that coastal flooding is getting worse, followed by sea level rise (SLR). Compared to the average subsidence scenario, the scenario with SLR projection and subsidence interpolated based on the local measurements in the research area by 2050 shows the highest flood volume with an increase at 1,483,251 m³ and a flood area increased by up to 1.5 km² (6.8% increase). The same impact events happened regarding the widest extent of extreme criteria of flood hazard that employs an increase at 11.5 km² (287% increase) and rose by 3 km² (35% increase) compared to the average subsidence through 2050.

本文使用基于栅格的淹没模型（LISFLOOD-FP），利用沿海淹没的主要原因（即极端水位和沉陷以及海平面上升）来模拟沿海洪水。具体而言，本研究使用了1997年至2015年三宝垄潮汐仪记录的线性估计来预测的2050年以前的海平面情景。此外，我们使用了古贝尔（1958年）提出的现代极值理论，计算了印度尼西亚三宝垄沿岸的极端水位。 ）和詹金森（1955）。沿海洪水的模拟表明，三宝垄的沉陷可能是沿海洪水恶化，海平面上升（SLR）加剧的主要原因。与平均沉陷情况相比，^3处，洪水面积增加了1.5 km ²（增加了6.8％）。与最严重的洪灾极端标准相比，发生了相同的影响事件，与到2050年的平均沉降相比，洪水增加了11.5 km ²（增加287％），上升了3 km ²（增加35％）。