Pemetaan Zona Banjir ROB di Wilayah Pesisir Belawan Berdasarkan Analisis Interaksi Atmosfer dan Laut Menggunakan Model Hidrodinamika DELFT3D

Abstract

The Delft3D Hydrodynamic Model is capable of simulating tidal floods. This study aims to map tidal floods in the port and coastal area of Belawan by analyzing the interaction between the atmosphere and significant waves. The data used in simulating the Delft3D model consisted of final analysis (FNL) data, MSLP data from NOAA/NCEP, and tidal data from ECMWF in 2022. The modeling results were then calculated using the Admiralty method and the Formzahl number. The model data is verified using tidal observation data from the Geospatial Information Agency (BIG). Based on the research findings, the model can simulate storm surge floods spatially and temporally with a model bias (error) of 25.5 cm and a correlation coefficient of 0.844. The annual mean sea level rise was 0.57 cm, with a Formzahl number value of 0.23, indicating a mixed semidiurnal tidal type. The wind parameter 15-20 knot can increase the tidal flood height by 2.07 cm, the significant wave parameter 150 cm can increase the tidal flood height by 50.35 cm.