العواصف الترابية بمنطقتي الرياض والقصيم والعناصر المناخية المؤثرة فيها : دراسة مناخية تحليلية

Abstract EN

Dust storms occur in the desert areas and semi-desert, These winds arise and consists of moving air deep depressions which derailed usual, because of the circumstances climatic fluctuations in the atmosphere.

Dust storm occurs when the availability of several conditions, including: dry soil, disjointed, and bare of vegetation, and the attainment of high wind speed.

This study aims to clarify the picture of the geographical distribution of dust storms monthly, quarterly and annual in the study area, and the study of climatic conditions associated with the occurrence of dust storms and dust, and measuring the correlation between the recurrence of dust storms and dust, temperature and relative humidity and rates of atmospheric pressure, rainfall, and the speed of the prevailing and extreme winds, also, to study the possibility of dust storms, dust and time trend in the study area, and the classification of dust storms, dust and climatic features associated with them.

The study pointed to several conclusions: including; increase the number of dust storms in the city of Qassim (59 storm) more from Riyadh (44 storm).

An increase in the total occurrence of airborne dust in Riyadh city ( 2272 ), in Qassim ( 1267 ).

The effect of the speed of the prevailing wind in the frequency of dust storms in the city of Riyadh by 32%, and dust by 69%.

In Qassim city, wind speed contribute to the recurrence of dust storms by 64%, and dust by 82%, and the wind speed maximum impact in a repeat of dust storms in the Riyadh city by 47%), and dust 59%.

Qassim city increased by 89%, and dust 85% .