Identification of Metocean Parameters Affecting Coastal Flooding in Semarang City, Central Java, Indonesia Anita Sari, Faruq Khadami, Muhammad Rais Abdillah
Bandung Institute of Technology, Bandung, Indonesia
Abstract
Coastal flooding is a phenomenon in which sea water enters and inundates the land. Semarang City is one of the coastal areas in Indonesia that is vulnerable to coastal flooding. Some of the factors that affect coastal flooding include tides, sea level rise, land subsidence, and meteorological factors. This research investigates the phenomenon of non-tidal water elevation, examining its relationship with sea surface height anomaly (SSHA) data, wind speed, and rainfall. This study used water elevation data from the Meteorology, Climatology, and Geophysics Agency at the Tanjung Emas Maritime Meteorological Station in Semarang for 4,8 years (May 2018 - December 2022). The threshold for the definition of coastal flooding used in this study is the non-tidal elevation that exceeds the data^s standard deviation. The analysis reveals that coastal flooding in Semarang City has strong seasonal characteristics, with varying intensity depending on the season. The highest number and intensity of coastal floods occurred in May with 90 days and June with 89 days, followed by the highest intensity in May with a tidal intensity of 0,2107 m and in January with a tidal intensity of 0,1922 m. This peak in the number of coastal flood events coincides with the seasonal increase in SSHA. The analysis of the composite mean of coastal flooding events revealed that SSHA and wind speed were the most influential meteorological parameters.
Keywords: Coastal Flooding, Semarang City, Non-Tidal Elevation, Sea Surface Height Anomaly, Wind Speed, Rainfall.
