IDENTIFICATION OF METOCEAN PARAMETERS AFFECTING COASTAL FLOODS IN THE CITY OF SEMARANG, CENTRAL JAVA, INDONESIA

• Main Author: Sari, Anita
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/85224
• Institution: Institut Teknologi Bandung

Coastal flooding is a phenomenon where 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. The phenomenon of non-tidal elevation, associated with sea surface height anomaly (SSHA) data, wind speed, and rainfall, was the subject of this research. The Meteorology, Climatology, and Geophysics Agency at the Tanjung Emas Maritime Meteorological Station Semarang and the University of Hawaii Sea Level Center (UHSLC) at Semarang Station provided the sea level elevation data used in this study for a period of 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. According to the calculation results, the threshold used for coastal flooding in this study varies depending on the scenario. This study used five scenarios, with scenarios 1 and 3 being the closest to the news coastal flood event. The results of the analysis showed that the highest occurrence and intensity of the analyzed coastal floods occurred in May and June, whose periods coincided with the dry season. Analysis of the composite average of coastal flood events shows that the metocean parameters that have the most influence on the occurrence of analyzed coastal floods are SSHA and wind speed.