Two Dimensional Simulation of Temperature and Salinity in the Gorgan Bay in During 2010-2011

In the present study, the results of two-dimensional simulation of temperature and salinity have been investigated in the Gorgan Bay during one-year period of 2011-2012. In order to implement Mike 21 model, wind speed and direction, evaporation and precipitation, relative humidity, rivers inflow, air and water temperature, salinity, short and long wavelengths as well as temperature, salinity and water level fluctuations has been used in the open boundary of the model. The model was adjusted with optimization of wind drag, bed resistance and salinity dispersion, attenuation light intensity and latent heat coefficients, and verificated using salinity and temperature field data. The results of simulation showed that salinity and temperature values in the Bay have an increasing trend from east to west in all seasons. The maximum temperature difference between the eastern and western parts of the Gorgan Bay is 3.5 degrees Celsius. The maximum temperature difference between day and night in the Gorgan bay is 4 degrees Celsius. Temperature and salinity changes in the western part of the bay are significant due to the increase in local water change time. Salinity change in the southern shores of the bay is affected by river inflows and salinity in the estuarine area is 4 PSU. Due to the decrease in water level and the movement of bay water masses from west to east in winter, salinity values in the deep and central areas of the bay during this period compared to other parts with a maximum of 16.5 PSU has an increasing trend. The maximum salinity is 21.1 PSU in the western part of the bay.