MODELLING OF TIDAL INUNDATION (ROB) IN PEKALONGAN

• Main Author: Try Atmojo, Aulia
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/48051
• Institution: Institut Teknologi Bandung

Tidal flood (rob) is a flood caused by high tides that inundate lowlands in coastal areas, estuaries, and deltas. In recent years, rob occurs not only during high tide conditions but also occurs in normal tide conditions. This is caused by a combination of rob with sealevel rise and land subsidence. The total magnitude of land subsidence (anthropogenic) is crucial information to understand the occurrence of rob. By knowing the initial time of land subsidence, the total magnitude can be determined. In the assessment of long-term vulnerability and risk, tidal hazard mapping, and tidal inundation modeling, it is necessary to monitor tidal flood-prone areas with scenarios of sea-level rise and predictions of land subsidence expansion. The goal of this research was to find out the inundated area based on the factors that most influence of rob with specific scenarios. The building of rob inundation models in this study was done by referring DEM to a vertical reference system of known value. Then after that, the DEM was corrected by the factors that influence the occurrence of a tidal flood. Model creating was done with certain scenarios in the years specified. The results of the tidal flood modeling show that in the SLR scenario and land subsidence (scenario 3), the depth of the flood reaches 4-5 meters in 2050 in some areas. In that year, inundated areas reached 72 km2, and the percentage of tidal flood areas was 79%. This means that in 2050 the tidal inundation area will reach 79% of the total area in Pekalongan City. Stopping the extraction of groundwater will reduce or even stop land subsidence. If the land subsidence stops, the tidal flooding that occurred (in Pekalongan) will be overcome.