Analysis of Synoptic and Thermodynamic Patterns Leading to extremely Heavy Rainfall and Estimation of Water Area Resulting from Precipitation in Karkheh Basin

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KEIKHOSRAVI GHASEM; SHAKIBA ALIREZA; Hamidpour Pegah

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Journal Paper

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Journal: Geographical Studies of Coastal Areas Journal Year:2022 | Volume:3 | Issue:1 (8) Page(s): 83-100

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Title

Analysis of Synoptic and Thermodynamic Patterns Leading to extremely Heavy Rainfall and Estimation of Water Area Resulting from Precipitation in Karkheh Basin

Author(s)

KEIKHOSRAVI GHASEM | SHAKIBA ALIREZA | Hamidpour Pegah | Issue Writer Certificate

Keywords

Extremely precipitation

Satellite imagery

Sudan low pressure

Saudi Arabia High pressure

Sub polar Trough

Abstract

To investigate the super-heavy precipitation of Karkheh Basin, daily precipitation statistics of the basin (2005-2018), radar satellite images of Sentinel 1, Landsat, and data on specific humidity, pressure, geopotential height, omega, and wind flow have been used. The results show that the total of heavy rainfall by year shows an increasing trend. Heavy rainfall varies from a minimum of 11 to 40 days (long-term cumulative amount) at the basin level. Most of the heavy rainfall in the basin occurs in the last days of winter and the first days of autumn. The location of Siberian high-pressure, Sudan low pressure, Pakistan lowpressure surface systems and dynamic high-pressure systems of Saudi Arabia and the Mediterranean is the dominant pattern and determinant of Extremely precipitation in the Karkheh catchment. The main reason for the increase in the lake's water area in Extremely precipitation is not the increase in the number of days of the rainy, but the large expansion south of the Mediterranean trough, eastward movement of the Saudi anticyclone on warm seas and vertical water vapor flux north of the warm southern seas. Also, in examining the position of the jet core to create extremely rainfall, the most suitable position of the core was observed in the transverse position of 24 degrees north and longitude 42 east (center of Saudi Arabia), so that in this case the most unstable part of the jet (exit area Jet) corresponds exactly to the front of the trough on the Karkheh basin.

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APA: Copy

KEIKHOSRAVI, GHASEM, SHAKIBA, ALIREZA, & Hamidpour, Pegah. (2022). Analysis of Synoptic and Thermodynamic Patterns Leading to extremely Heavy Rainfall and Estimation of Water Area Resulting from Precipitation in Karkheh Basin. GEOGRAPHICAL STUDIES OF COASTAL AREAS JOURNAL, 3(1 (8) ), 83-100. SID. https://sid.ir/paper/964797/en

Vancouver: Copy

KEIKHOSRAVI GHASEM, SHAKIBA ALIREZA, Hamidpour Pegah. Analysis of Synoptic and Thermodynamic Patterns Leading to extremely Heavy Rainfall and Estimation of Water Area Resulting from Precipitation in Karkheh Basin. GEOGRAPHICAL STUDIES OF COASTAL AREAS JOURNAL[Internet]. 2022;3(1 (8) ):83-100. Available from: https://sid.ir/paper/964797/en

IEEE: Copy

GHASEM KEIKHOSRAVI, ALIREZA SHAKIBA, and Pegah Hamidpour, “Analysis of Synoptic and Thermodynamic Patterns Leading to extremely Heavy Rainfall and Estimation of Water Area Resulting from Precipitation in Karkheh Basin,” GEOGRAPHICAL STUDIES OF COASTAL AREAS JOURNAL, vol. 3, no. 1 (8) , pp. 83–100, 2022, [Online]. Available: https://sid.ir/paper/964797/en

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