Document Type : Original Article
Authors
1
Ph. D Student Department of Geography, Na. C., Islamic Azad University, Najafabad, Iran
2
Professor Associate Department of Geography, Na. C., Islamic Azad University, Najafabad, Iran
3
Professor Assistant Department of Geography, Na. C., Islamic Azad University, Najafabad, Iran
4
Professor Associate Rangeland Research Department, Forest and Rangeland Research Institute, Agricultural Research, Education and Extension Organization, Tehran, Iran
10.30740/cccd.2025.737316
Abstract
Heavy rains cause large floods that damage many natural resources needed by humans. In this research, the goal is to reveal synoptic patterns of heavy and super heavy rains in Lorestan Province. To this aim, daily precipitation data from Dorood stations and ECMWF climate database were used. Using percentile method, heavy rains at the 95th percentile and super heavy rains at the 99th percentile were determined. By applying the percentile method to the daily rainfall, two samples of super-heavy (March 27, 2007; April 1, 2019) and two samples of heavy rainfalls (February 3, 2006 and January 9, 1999) were extracted. The results showed that more than 90% of the heavy rainfall cases and more than 70% of the monthly rainfall were recorded in 24 hours. The results of the analysis showed a deep trough over the eastern Mediterranean Sea and western Iran in the super-heavy events, which has prepared the conditions for the ascent air mass and entry of low-pressure systems in the western part of the country. However, in this study, the establishment of a low-altitude blocking system cut off at the atmospheric mid - level has provided the conditions for heavy rainfall events in January and February.
Keywords