PEMODELAN SPASIO TEMPORAL BANJIR ROB AKIBAT PASANG SURUT AIR LAUT HARIAN (STUDI KASUS: WILAYAH PEKALONGAN DAN SEKITARNYA)

• Main Author: Baihaqi Hakim, Moh.
• Format: Final Project
• Language: Indonesia
• Subjects: Karya Umum
• Online Access: https://digilib.itb.ac.id/gdl/view/56814
• Institution: Institut Teknologi Bandung

The Pekalongan region located in the lowlands of the North coast of Java Island, with an elevation approximately 1 meter above sea level is included in a developing industrial area marked by ongoing development in this region. The ongoing development turns out to have a bad impact on this area because it is often hit by tidal floods. Therefore, in this study, we will simulate the occurrence of tidal flooding which can provide information about the distribution of tidal inundation every 1 hour during the lowest tide to the lowest tide again when the high tide anomaly occurs in Pekalongan area in 2021, that is on June 1-2 and December 10-11, 2021. From the results of this modeling, it can be compared with the area of tidal flood inundation generated through tidal flood modeling in 2021 without the daily tidal factor, so that it can be seen how much influence the daily tide has. To model tidal flooding, it can be done by processing the DEM of the Pekalongan area by combining the results of observations of the Multi GNSS RTK in 2019 with DEMNAS data, then this combined data is transformed into a low tide High Reference System with the lowest low tide reference value during 2021 with sea level rise correction from altimetry satellite observations and land subsidence obtained from a combination of GPS and InSAR data. After the DEM data is formed, the next step is to integrate DEM data with daily tidal height prediction data in the Pekalongan area on June 1-2 and December 10-11 2021. From the results of tidal flood modeling due to daily tides, the largest tidal flood inundation occurred at the highest tide on December 11, 2021 at 03.00 WIB with a total inundation area of 5306.284 hectares. The effect of daily tides on the area of tidal flood inundation is an increase in inundation area of 4696.577 hectares or an increase of 36.45% of the total area of Pekalongan at the time of the highest tide. The results of matching the tidal flood model using Landsat 8 OLI/TIRS satellite imagery showed an accuracy rate of 88.75%.