Temporal-Spatial Analysis of Rainfall Days Frequency Trend of Western Iran Regions

Precipitation including climatic elements in the dimension of time and space changes a lot. In the study of extreme precipitation because of the devastating effect it is of great importance. The aim of this study is to identify and analyze theslope of the western regions of extreme precipitation, which is to achieve this goalprecipitation data of 69 synoptic stations and climate (province of Kerman, Kermanshah, Hamedan, Ilam, Lorestan and Kurdistan), in during the statistical period (2010-1961) were used and the annual threshold of extreme precipitation West generalized method of distributing a limit to the western regions of the country to 22 mm respectively. The extreme precipitation for each month during the period under study western regions using Mann-Kendall method identified and analyzed. and in December this increase was observed in the western half of Kermanshah province and in February this positive trend observed in the northwestern province of Kurdistan conceptual framework, these areas are consistent with the Zagros mountains.