Document Type : Research Paper

Authors

• Hushang Ghaemi ¹
• Hassan Lashkari ²
• Tayyebeh Namdarian ³

¹ Retired Professor of the Meteorological Organization of Iran

² Assistant Professor of Shahid Beheshti University

³ Master of Science in Shahid Beheshti University

Abstract

Recognition of the country's precipitation regime and its spatial and temporal dispersion can be a better basis for proper planning to deal with damage and reduce the effects of abnormalities of water resources. In the present study, the monthly and annual data of 22 synoptic stations during the statistical period (1986-2005) have been used to determine the time and place indices of precipitation and its changes. (Table 2 shows the geographic position of the stations). The analysis shows that according to the average station precipitation of 20 years old, precipitation in the northwest of Iran is 354 mm, variation coefficient of precipitation 0.26, skewness 0.39 and bezel 0.86 respectively. Studies have shown that rainmaking systems that invade the area create different effects due to the geographic location of the stations.

Keywords

• Spatial and temporal indices of precipitation
• variation coefficient of precipitation
• sloping
• skewness