Multi-temporal Satellite Derived Bathymetry for Monitoring Post-disaster Change in Underwater Topography M Zaidan Nafis, Arshel Rianggara Y, Delia Angelika Sirait, M Rizky Perdana, Eka Djunarsjah, Miga Magenika, Andika Permadi Putra
Hydrography Research Group, Geodesy and Geomatics Engineering, Institute of Technology Bandung, Bandung, Indonesia
Abstract
Natural disasters in coastal areas such as tsunamis and earthquakes can cause extreme changes in topography on land and bathymetry on the seabed. Unfortunately, changes in bathymetry on the seabed are rarely monitored due to the high cost of bathymetric surveys and the lack of urgency to do so after disasters. In fact, monitoring changes in bathymetry is essential for coastal management, tidal flood prediction, and post-disaster recovery. Satellite Derived Bathymetry (SDB) is a method of extracting depth values using satellite imagery that can be a cheap and easy-to-use alternative for post-disaster bathymetry monitoring to determine changes in the shape of the seabed. SDB is used to obtain bathymetry information before and after a disaster in a water area, with the difference in value of the two results showing changes in the shape of the seabed caused by natural disasters. The results of this study are maps of bathymetry changes before and after the disaster, and calculations of the volume of seabed components that have changed. With the SDB method, the process of monitoring bathymetry changes is expected to be faster and cheaper to do so that it can help fulfil the need for accurate bathymetry change information.
