Abstract
This study aims to highlight the natural risks induced by spatiotemporal interaction between the geomorphological features and the urban growth of Jeddah, the largest city in Makkah Province, Saudi Arabia. The methodology is based on remote sensing and Geographic Information System (GIS) techniques. A spatial analysis of the GIS layers extracted from multisource remotely sensed data from 1965 to 2020 was performed. The results show that the urban area has doubled more than 30 times and has increased from around 36 sq. km in 1965 to more than 1,130 sq. km in 2020. Consequently, the city expands to all morphological units, resulting in multihazard susceptibility and exposure. In order to identify and and prioritize the various risks associated to geomorphic processes, a map has been designed to classify the natural risk areas according to their intensity and their factors. Thus, geomorphological constraints have a significant impact on urban planning.