Abstract
Sandstorms that cause shifting dunes are a huge technical challenge in the development of the railway network in Saudi Arabia, and are known as one of the most concerning atmospheric aspects. In this case, the weather or climate change makes railways more problematic and costly in Saudi Arabia compared to other countries. The purpose of this article is to develop Saudi Arabia's rail system in order to overcome environmental difficulties and obstacles such as wind-sand flow behavior and other impediments (e.g., camels) by constructing obstructions such as protective walls and dykes. Theoretical analysis is used to investigate the major components that influence wind velocity and density. The wind velocity in the majority of the locations in Saudi Arabia was employed as a control value in this study, which was based on the Saudi building standard SBC301. Sandstorm protection is best achieved by combining four different building solutions, including ditches, dykes, trees, and concrete barriers. The site parameters, such as sand particle size, air velocity, and the required downwind strip distance, all influence which of the four recommended approaches is optimal. From this study, it is concluded that the wind speed at the height of interest (barrier height) should be calculated using wind shear exponents ranging from 0.2 to 0.5 depending on the topography and surface roughness aspects. A new equation based on two parameters, Q1 and n, as a function of the wind shear exponent is suggested to predict the percentage of wind velocity increase (Vinc %) over the barriers. This study found that the protected distance between the downwind strip and the receiver might be anywhere between 20 and 40 m.