Scientific- Research Quarterly of Geographical Data (SEPEHR)

Scientific- Research Quarterly of Geographical Data (SEPEHR)

The Effect of Wind and Air PressureFields on the Water Level of the Level Measuring Stations of the South Caspian Sea Coasts

Document Type : Research Paper

Authors
Abdolazim Ghangormeh
Javad Malek
Assistant professor of geography, Golestan University
10.22131/sepehr.2015.14475
Abstract
The Caspian Sea like all other seas andgreat lakes is constantly turbulent under the influence of various hydrodynamic phenomena such as storm tide, storm surges caused bythe wave and wind, rise of wave in the coastal zone, and the phenomenon of resonance.But the reason for all of these phenomena is the forces caused by the air pressure and wind fields on the sea.In this research, the effects of air and wind pressure data (components) on observational levels in the level measuring stations of Bandar Anzali, Noshahr, Bandar Sadra (Neka) and Ashuradeh were investigated.For this purpose, the hourly data of the water level of the aforementioned stations during a four-year period (2000-2003) and also the data of air and wind pressure on the Caspian Sea were used with temporal-spatial resolutions of 6 hours and 0.25 degrees (25 km) during a 4 year period onwards.To study the range of the effects of these factors (air andwind pressure) on the data of the level measuring stations, the 50x50 to 250x250 km networks (with 50km sequence) were extended towards the main body of the sea. A linear multivariate regression model was used to determine the coefficients and the amount of the effect of wind and air pressure components, and the results were obtained monthly for each station. The results show that, by modeling a wider field of air and wind pressure effectiveness on the water zone overlooking each station, the calculated and observed results of the water level data are more correlated, so that the maximum correlation coefficient for the 250x250 km field for the Anzali stationsis 0.864 in November, for Noshahris 0.909 in November, for Sadra (Neka) is 0.893 in March and for Ashoradeis 0.873in April.
Keywords
Caspian Sea Level
wind field
Air Pressure field
Level Measuring Station
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