Determining flood-prone points and statistical-synoptic analysis of torrential rains in East Azarbaijan province

In this research, the flood-prone areas of East Azarbaijan province were identified using the flood damage information of regional water and crisis management for the period of 1378-1397, and a map of the spatial distribution and frequency of flood events was drawn. The highest frequency of floods occurred in the western half of the province, especially in the cities of Marand, Shabestar and Tabriz, among which the floods with a frequency of more than 10 days are related to the cities of Tabriz, Shabestar, Marand, Jolfa and Sarab. In order to determine synoptic patterns for each day of torrential and heavy rainfall in the province, maps of the upper levels of the atmosphere as well as indices of atmospheric instability were examined along with the skew-T map. The systems were identified based on the origin of the classification system and 7 systems, which include the high pressure of Siberia, the Black Sea, the Mediterranean and the Red Sea, as well as a combination of these systems. The highest number of systems is related to the Mediterranean system with 78 cases and the Mediterranean and Black Sea system with 54 cases in the second place. Precipitation systems are divided into two dynamic and thermal categories in terms of the air rising factor, and the frequency of systems leading to flooding is generally 58% related to dynamic systems and 42% of them related to thermal systems caused by the formation of clouds. They are local convection.