Spatial Analysis of the Impact of the Slopes on the Sana'a-Hodeida Road

Abstract

This research aims at making a digital map of the levels of impact of slopes on the parts of the Sana'a-Hodeida road, which are represented by the impact of landslides and the impact of torrents, because it is a suitable environment for a number of forces to occur, which cause damage to the road, especially during the period of rainfall and decommissioning for some time. The study analyzes the natural characteristics of the road, and then it analyzes the elements of the slopes on which it is located in order to make a Spatial Modeling of producing a map of the levels of impact of the slopes on the parts of the Sana'a-Hodeida road. The (Weighed Overlay) method will be used, based on four factors or criteria comprising the elements of slope (slope degree, slope direction, slope shape and runoff velocity). Accordingly, this research divided the risk levels of slopes on the parts of the road to five levels, as follows: High and very high risk levels (36.6%) of the total length of the road, medium risk level and semi-level (safe) and very safe level (37.0%, 26.4%), respectively of the total length of the road.