Sentinel-1-derived Multi-Temporal Flood Hazard of North and South Java: The Case of Bodri and Serayu Watershed

The North and South part of Java Island has their own watershed characteristic, which affects its flood dynamics. There have been many studies on flood mapping in each region but it is mostly a static model which didn't consider the topographic or climate dynamic. Here we are developing a multi-temporal flood hazard using Synthetic Aperture Radar (SAR) satellite imagery Sentinel-1 collection to study the flood characteristic of each region. Each region is represented by one watershed: Bodri for the north and Serayu for the south. The result shows that areas that have high flood hazards tend to be located in densely populated areas. The reason is that flood is a compromise of high accumulation of freshwater while occasionally hazardous in certain periods. The accuracy test used in this research using TPI is limited, it is important to have a periodic flood extent map to test our result.