SIMULATION OF SEA WATER INUNDATION ON THE NORTH COAST OF WEST JAVA DUE TO SEA LEVEL RISE AND LAND SUBSIDENCE BY USING DELFT3D

• Main Author: Librian Fikri Al-Buchori, Adam
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/69236
• Institution: Institut Teknologi Bandung

Inundation due to sea water in coastal areas is a coastal problem that often occurs, especially in some coastal areas north of Banten, Subang, to Cirebon. This study aims to determine the characteristics of the inundation on the north coast of West Java, thus a 2D hydrodynamic simulation of the subsidence in the coastal area using Delft3D is carried out with tidal, wind, sea level rise, and land subsidence inputs. The simulation was carried out for 7 years from 2015 to 2021 with a spatial resolution of 185x185 m2 and a temporal resolution of 10 minutes model. Tidal data was obtained from the Tidal Model Driver, wind data was downloaded from Copernicus, sea level rise data with the rate of 5.88 mm/year, and land subsidence data with the rate of 8 cm/year. The tidal inundation has neither seasonal nor annual variability, with a seasonal average inundation area of 1806.80 Ha to 2197.19 Ha. The addition of the influence of the wind provides seasonal variability where the west monsoon is more extreme than the east monsoon, and an increase in the immersion area is up to 0.45% of the tidal inundation. Sea level rise has an impact on increasing seasonal variability thus the inundation in the west monsoon is 1076.07 Ha greater than the east monsoon, and an increase in inundation area is up to 27% of the inundation due to tides. The addition of the inundation duration was significantly caused by the wind with an increase of 4 hours 9 minutes per day, while the addition of the inundation depth was significantly influenced by the sea level rise of 9.95 cm. Land subsidence has an extreme impact on the immersion area up to 243% of the inundation caused by the tide.