The actual value of rain for Shahat, Sirt, Tripoli, Gadamis and Al Jaghbub stations for the time period (1970-2010)

Abstract

     The research examines the coefficient of rain or drought (the actual value of rain) and the most important factors that limit it. To measure the actual value of rain which affect plant life, five meteorologic stations were selected throughout Libya. In the north-east of the country, Shahat station, the coastal station of Sirte on the Gulf of Sirte in the central region, Tripoli station in the northwest of the country, Jagboub station in the southeast of the country, and Ghadames in the southwest of Libya. The researcher used three different coefficients to achieve the aims of this study: Lang's coefficient, Demarton's coefficient, and Sharaf's coefficient.

In general, the study indicated that the study area is subject to three different types of climates.  The first is a humid climate dominated by vegetation, which is rich in grass and tree.  The second is semi-dry, dominated by poor grasses, represented in the stations of Tripoli and Sirte, and the third is dry, represented in the regions of Jaghbub and Ghadames. There is also a great similarity between the coefficients used, all of which indicate three climatic regions, but the Demarton coefficient is closest.

The researcher suggested a number of recommendations that may reduce the losses in the process of evaporation and increase the actual value of rain.