Abstract
Monitoring of flashflood consequences in arid environments can be realized by using either active or passive remote sensing data based mostly on the acquisition circumstances and the tackled objectives. Mapping of sediment in shorelines is a practical example where both remote sensing data can be combined to obtain robust results. The study area located on the west coast for Saudi Arabia where the shoreline of Umluj city was under investigation after a significant flash flood took place. Remote sensing images comprise of synthetic aperture radar were utilized to map the sedimentation extent with the study area process that took place after a flash flood within the designated study area. Both images were analyzed and processed using change detection techniques to quantify the sedimentation process. The late image was registered in August 2018 while the recent image was registered in March 2019 following an unusual flash flood event that occurred within the vicinity of the study area. Sediment deposits along the shoreline of the study area increased by nearly 171% and cover sea surface area closely to 4,500 km(2). Consequently, the temporal monitoring of shorelines to map the sedimentation process thematically should be nature conservation priorities specifically in fragile ecosystems.