Volume 13, Issue 26 (12-2022)
J Watershed Manage Res 2022, 13(26): 178-188 |
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Roradeh H, Safarrad T, Alikhani Kashkaki Z. (2022). Estimation of Probable Maximum Precipitation at Talar Basin of Mazandaran Province using Synoptic Method. J Watershed Manage Res. 13(26), 178-188. doi:10.52547/jwmr.13.26.178
URL: http://jwmr.sanru.ac.ir/article-1-1193-en.html
URL: http://jwmr.sanru.ac.ir/article-1-1193-en.html
1- University of Mazandaran
Abstract: (1664 Views)
Extended Abstract
Introduction and Objective: Intensity, duration, and type of precipitation are among the data that are very important in creating floods. Heavy precipitation that turns into runoff can cause floods and catastrophic consequences. If the highest precipitation that causes flood is calculated, it can be used to reduce the destructive effects of the flood. The probable maximum precipitation during the current century compared to the past has increased significantly due to climate change. Estimation of this parameter is very important and is usually used for engineering applications and estimating the probable maximum flood.
Material and Methods: In this study, the estimation of the probable maximum precipitation of the Talar basin in Mazandaran province was studied by the synoptic method. Precipitation statistics of regional stations and the IDW method were used to draw rainfall maps.
Results: The Zirab station with 245.5 mm recorded the highest rainfall in 7 days and was identified as the center of precipitation. Using dew point temperature and wind speed, the storm maximization coefficient was calculated to be 76.1 and the maximum probable precipitation for a duration of one to seven days was obtained, which on average the rate of increase in precipitation according to the maximum probable precipitation is 75.96%. Examination of sea level maps and 500 hPa level in the storm of March 17, 2017, shows that a low height is located in Iran, the axis of trough starts from the east of the Black Sea and continues to the center of Iran and in the west, it can be seen on the high Black Sea. Its ridge axis starts from the north of the Blacking Sea and extends to the southeast of the Mediterranean. The trough with very strong vorticity and a strong ridge next to it formed a Blocking.
Conclusion: Deployment of the Blocking and the embedment of short waves in front of the trough added to the unstable weather conditions in the area. The low-pressure system in northwestern Europe crossed the Black Sea and western Iran, then entered the southern shores of the Caspian Sea. Deployment of low dynamic pressure on the Caspian Sea Moisture fluid from the sea to the study area increased the precipitation system. As a result, the relative humidity of the northern coasts of the country reached 90% on March 17 and 18, and in the design of hydraulic structures, emphasizing this storm, the maximum possible rainfall of 4 to 6 days should be considered, which was estimated stronger than other continuities.
Introduction and Objective: Intensity, duration, and type of precipitation are among the data that are very important in creating floods. Heavy precipitation that turns into runoff can cause floods and catastrophic consequences. If the highest precipitation that causes flood is calculated, it can be used to reduce the destructive effects of the flood. The probable maximum precipitation during the current century compared to the past has increased significantly due to climate change. Estimation of this parameter is very important and is usually used for engineering applications and estimating the probable maximum flood.
Material and Methods: In this study, the estimation of the probable maximum precipitation of the Talar basin in Mazandaran province was studied by the synoptic method. Precipitation statistics of regional stations and the IDW method were used to draw rainfall maps.
Results: The Zirab station with 245.5 mm recorded the highest rainfall in 7 days and was identified as the center of precipitation. Using dew point temperature and wind speed, the storm maximization coefficient was calculated to be 76.1 and the maximum probable precipitation for a duration of one to seven days was obtained, which on average the rate of increase in precipitation according to the maximum probable precipitation is 75.96%. Examination of sea level maps and 500 hPa level in the storm of March 17, 2017, shows that a low height is located in Iran, the axis of trough starts from the east of the Black Sea and continues to the center of Iran and in the west, it can be seen on the high Black Sea. Its ridge axis starts from the north of the Blacking Sea and extends to the southeast of the Mediterranean. The trough with very strong vorticity and a strong ridge next to it formed a Blocking.
Conclusion: Deployment of the Blocking and the embedment of short waves in front of the trough added to the unstable weather conditions in the area. The low-pressure system in northwestern Europe crossed the Black Sea and western Iran, then entered the southern shores of the Caspian Sea. Deployment of low dynamic pressure on the Caspian Sea Moisture fluid from the sea to the study area increased the precipitation system. As a result, the relative humidity of the northern coasts of the country reached 90% on March 17 and 18, and in the design of hydraulic structures, emphasizing this storm, the maximum possible rainfall of 4 to 6 days should be considered, which was estimated stronger than other continuities.
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