List of Articles Gorgan Bay

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  1 - Modeling of Possible Dredging Effects of Khozeini Channel on the Water Renewal Time in Gorgan Bay, Southeast of tmj nhe Caspian Sea
  saeed sharbaty Sorena Nasimi
  10.22034/jest.2018.12460
  Background and Objective: Water renewal time, one of the important indicators, is considered for estimation of health status of marine ecosystem. The Khozeini channel has been the second communicative ways of the Gorgan Bay with the Caspian Sea which is blocked by decre More

  Background and Objective: Water renewal time, one of the important indicators, is considered for estimation of health status of marine ecosystem. The Khozeini channel has been the second communicative ways of the Gorgan Bay with the Caspian Sea which is blocked by decreasing of sea water level and sedimentation in recent years. In this investigation, in order to considering of Khozeini channel possible dredging effects on the Water Renewal Time in the Gorgan Bay, the Hydrodynamic and Advection-Dispersion modules of two-dimensional Mike21 FM model were coupled  simultaneously. Method: The modeling on two triangular unstructured meshes and under two different open boundary conditions by including wind stress, water fluctuations in the mouth of Bandartorkaman-Ashoradeh and Khozeini channel, rivers input, evaporation and precipitation during index year were done. To determine the amount of dispersion coefficient in the Gorgan Bay, salinity modeling using Advection-Dispersion module of MIKE 21 FM were developed. Findings: The results two-dimensional salinity modeling showed that the best of dispersion coefficients are 350 m2/s in Gorgan Bay. The results of calculating of the Integral Water Renewal amount under blocking Khozeini channel condition was 54 days and dredging channel condition a width of 170 m was 41 days. Discussion and Conclusion: The best time for Water Renewal Time modeling in Gorgan Bay is the beginning trend of intering annual water level rising in the Caspian Sea. Renewal Time values are depending on hydrodynamic regime and salinity dispersion coefficient in Gorgan Bay. According to the common counterclockwise water circulation pattern in Gorgan Bay, Khozeini channel dredging reduces Integral Renewal Time of up to 13 days. Manuscript profile
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  2 - Forecasting the Effect of Decreasing Long Time Trend of Caspian Sea Water Level on the Life of Gorgan Bay
  Saeed Sharbaty Abdolazim Ghanghermeh
  Introduction: Gorgan Bay is a semi enclosed water body which currently has only a permanent connection with the Caspian Sea through mouth of Ashouradeh-Bandartorkaman. Decreasing trend of the Caspian Sea water level in past 19 years caused to adverse effects by land pro More

  Introduction: Gorgan Bay is a semi enclosed water body which currently has only a permanent connection with the Caspian Sea through mouth of Ashouradeh-Bandartorkaman. Decreasing trend of the Caspian Sea water level in past 19 years caused to adverse effects by land production in shallow coasts of Gorgan Bay and it is threatening  that limited connection of Gorgan Bay with the Caspian Sea will cause disconnection totally. Material and Methods: In this research, the effects of decreasing trend of the Caspian Sea water level on the connection status of Gorgan Bay were modeled under two scenarios of decreasing mean water level collections of the Caspian Sea. In first set of scenarios, the average of 5.2 cm and in set of second scenarios the average of 10.5 cm of decreasing water level in the Caspian Sea were used to topography position modeling in the Gorgan Bay. Results and Discussion: Under the first set of scenarios, the results of modeling show that, the connection of the Gorgan Bay with the Caspian Sea will be cut off permanently in Chapaghly area affected by decreasing in negative level in 27.6 meter in water year of 1410 – 1411. Under the second set of scenarios, the results of modeling show that the connection of the Gorgan Bay with the Caspian Sea will be cut off permanently in Chapaghly area affected by decreasing in negative level in 27.6 meter in water year of 1402 – 1403. Therefore it suggests that all the projects and the strategic programs of the government in southern coasts of the Caspian Sea including Gorgan Bay, engineering and operational program to be operated according to Amenagement Territoire scheme regarding to the approach of decreasing the level of the Caspian Sea and probable scenarios Manuscript profile
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  3 - Impacts of Khozeini Canal Reopening on General Current Pattern in Gorgan Bay (South East of the Caspian Sea)
  Saeed Sharbaty Ali Shabani
  Background and Objective: Khozeini canal is the second permanent connection way of Gorgan Bay with the Caspian Sea which has been blocked as a result of water level decreases and sedimentation in recent years. Methods: In this investigation, 2D modeling results of curr More

  Background and Objective: Khozeini canal is the second permanent connection way of Gorgan Bay with the Caspian Sea which has been blocked as a result of water level decreases and sedimentation in recent years. Methods: In this investigation, 2D modeling results of current pattern using MIKE 21 FM model for investigating the impacts of Khozeini canal reopening on the general current pattern in Gorgan bay under 24 different scenarios were compared. Modeling was implemented on two types of unstructured meshes for 5 hours, 50 minutes and with 30 seconds time steps. In all modelings, the mean annual precipitation, evaporation and 13 rivers input to the bay as well as the effect of dominant eastern wind with 6 different speeds were used. The effects of components of the wave radiation induced by dominant wind were included by implementation of the wave model of MIKE 21 NSW in the 6 distinct considered in the hydrodynamic model of MIKE 21 FM. In order to include boundary conditions at the open boundaries, the mean maximum discharges of inlet and outlet in the Ashoradeh-Bandartorkaman spans and Khozeini canal were used. Results: Simulation results represented that the current pattern in Gorgan Bay is influenced by the inlet and outlet discharges at the spans of Ashoradeh-Bandartorkaman and prevailing wind. Conclusion: Reopening of the Khozeini canal has no significant effect on the general circulation current pattern of the bay and only in areas very close to the canal changes the local current pattern to be North-South. In stormy times, the maximum current velocity of 0.23 meters per second was observed in areas close to the canal. Manuscript profile
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  4 - Two Dimensional Modeling of Net Water Renewal Time in Gorgan Bay
  saeed sharbaty Hamed Kolangi Miandareh
  10.22034/jest.2017.11292
  Background and Objective: Net Renewal Time is one of the most important indicators for water quality analysis in the water bodies. In this study, in order to investigate the Net water Renewal Time in Gorgan Bay, two modules from two dimensional Mike21FM model including More

  Background and Objective: Net Renewal Time is one of the most important indicators for water quality analysis in the water bodies. In this study, in order to investigate the Net water Renewal Time in Gorgan Bay, two modules from two dimensional Mike21FM model including Advection-Dispersion and Hydrodynamic were coupled. Method: Modeling was performed under 4 different scenarios with inclusion of some factors such as wind stress, river input, precipitation, evaporation and water fluctuations in spans of Ashoradeh-Bandaretorkaman. Findings: The modeling results showed that integral Net Renewal Time in Gorgan Bay was 0.0181 per days. Variations in the amounts of Net Renewal Time were strongly influenced by prevailing hydrodynamic regime in Gorgan Bay. Net Renewal Time in distance of 1 km from the input spans was less than one day. This time index rate decreases by moving along longitudinal axis of the bay from east to west. Net Renewal Time in northeastern area was more than the corresponding areas in southeastern part. There was no significant difference in the Net Renewal Time for southern and northern parts of the west area. The modeling results in the four seasons showed that the Renewal amounts in winter and spring were more than those in summer and fall, and these results were consistent with increasing and decreasing inter-annual water level trend in the Caspian Sea, respectively. Conclusion: Due to the low water Net Renewal Time in Gorgan Bay, it can be concluded that the water flushing system has very low speed in this water body and any use of it must be done with further studies and arrangements. Manuscript profile
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  5 - Gorgan Bay plankton flourishing status in the field of Miankale death in February 2020
  taher poursufi
  AbstractCase sampling was performed in the winter of 2020 in the eastern region of Gorgan Bay in three coastal and central regions to investigate the causes of bird death. For this purpose, algal (macro and micro), zooplankton and water communities were sampled. The res More

  AbstractCase sampling was performed in the winter of 2020 in the eastern region of Gorgan Bay in three coastal and central regions to investigate the causes of bird death. For this purpose, algal (macro and micro), zooplankton and water communities were sampled. The results showed that a total of 44 species of phytoplankton were identified. 4 species equal to 12.5% and Euglenophyta branch with the lowest number with 2 species equal to 7.7% of the total species. The highest mortality was observed in Changar species and a few flamingos were observed. No algal blooms were observed during sampling. The density of cyanophytes was the lowest. Therefore, the cause of death of birds cannot be density or planktonic secretions. Manuscript profile
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  6 - Distribution, frequency and biomass of macrobenthos of Gorgan Bay and south east of Caspian Sea, Golestan Province
  M. Saghali R. Bagherov R. Patimar S. A. Hosseini N. M. Makhtomi
  In present research biomass, frequency and distribution of macrobenthos in Gorgan Bay was studied in 8 stations in 4 seasons in 2009. Sampling was done by Van Ven Grab in 3 replicates in each station. Identified macrobenthos belonged to 13 families. The most abundant fa More

  In present research biomass, frequency and distribution of macrobenthos in Gorgan Bay was studied in 8 stations in 4 seasons in 2009. Sampling was done by Van Ven Grab in 3 replicates in each station. Identified macrobenthos belonged to 13 families. The most abundant family was Ampharetidae (76%) compared to total population of macrobenthos. Balanidae (10%), Cardiidae (6%) and Nereidae (4%) had the next abundance. Maximum biomass of macrobebthos was observed in Cardiidae (45%), Balanidae (44.78%), Nereidae (5.8%) and Tubificidae (5.27%), respectively. The greatest frequency of macrobenthos was found in spring with 4110/m2 and the least was in winter with 29.25/m2. Maximum and minimum of biomass was observed in spring (33.568 g/m2) and winter (.080 g/m2) respectively.   Manuscript profile