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  • 1
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    Measurement the extract content of chlorophyll pigment (a,b,c) and correlations hydrologic parameters in summer (Case Study: Gomishan International Wetland) (2021)
    In:  http://aquaticcommons.org/id/eprint/22183 | 18721 | 2018-02-23 14:02:54 | 22183 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-06-29
    Description: Concentration of chlorophyll-a is an adequate parameter for assessing the trophic state in the summer. So, check the photosynthetic content of pigments as a bioindicator of chlorophylla,b,c were studied in six stations of Gomishan international wetland and a sea station. Furthermore were investigated the qualitative evaluation of trophic state of the wetland and its dynamics. Phytoplankton samples after the filtration were extracted in 90% acetone, and were obtained the absorption of pigments in Spectrophotometer. In addition to chlorophyll, were measured the water temperature, dissolved oxygen, pH, salinity, turbidity and depth. Based on results, the increasing concentrations of chlorophyll-a in September showed the trophic level was hypertrophic and occurred the cyanobacterial bloom. The statistical results showed log Chl-a a positive significant correlation with water temperature, dissolved oxygen and salinity (p〈0.01). Also in the Gorganrud estuarine (S2) was measured the diatom bloom as pollution indicator in July. The Gomishan coastal wetland on one hand affected by the human activities in adjacent areas and the other hand under is the influence of global warming on a large scale and in its catchment area, that causing the intensity of evaporation, salinity and become its shallow. Accordingly, improving circulation of wetland water and connection with the sea, improving future guidelines on the estuarine management, reduce and control of urban wastewater and aquaculture wastewater filtration is suggested.
    Keywords: Biology ; Limnology ; Pollution ; Biological indicators ; Chlorophyll-a ; b ; c ; Gomishan international wetland ; Iran ; parameters ; summer Hydrologic parameters ; TSI index
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 171-180
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  • 2
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    Measurement the extract content of chlorophyll pigment (a,b,c) and correlations hydrologic parameters in summer (Case Study: Gomishan International Wetland) (2018)
    Details
    Publication Date: 2021-05-19
    Description: Concentration of chlorophyll-a is an adequate parameter for assessing the trophic state in the summer. So, check the photosynthetic content of pigments as a bioindicator of chlorophylla,b,c were studied in six stations of Gomishan international wetland and a sea station. Furthermore were investigated the qualitative evaluation of trophic state of the wetland and its dynamics. Phytoplankton samples after the filtration were extracted in 90% acetone, and were obtained the absorption of pigments in Spectrophotometer. In addition to chlorophyll, were measured the water temperature, dissolved oxygen, pH, salinity, turbidity and depth. Based on results, the increasing concentrations of chlorophyll-a in September showed the trophic level was hypertrophic and occurred the cyanobacterial bloom. The statistical results showed log Chl-a a positive significant correlation with water temperature, dissolved oxygen and salinity (p〈0.01). Also in the Gorganrud estuarine (S2) was measured the diatom bloom as pollution indicator in July. The Gomishan coastal wetland on one hand affected by the human activities in adjacent areas and the other hand under is the influence of global warming on a large scale and in its catchment area, that causing the intensity of evaporation, salinity and become its shallow. Accordingly, improving circulation of wetland water and connection with the sea, improving future guidelines on the estuarine management, reduce and control of urban wastewater and aquaculture wastewater filtration is suggested.
    Description: Published
    Keywords: Biological indicators ; Chlorophyll-a ; Chlorophyll-b ; Chlorophyll-c ; Hydrologic ; TSI index ; Parameters
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.171-180
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  • 3
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    Study of diversity, density and phytoplankton concentration in summer stress of environmental parameters (Case Study: Gomishan international wetland) (2020)
    Details
    Publication Date: 2021-05-19
    Description: In this study, relationship between summer dynamics of chlorophyll a, nutrient, temperature, pH, salinity, dissolved oxygen, phytoplankton diversity and density are investigated in Gomishan wetland. Based on results, 5 branches of phytoplankton (13 genus and 15 species) has identified in summer. Cyanophyta and Bacillariophyta have the most phytoplankton diversity and Chlorophyta and Cyanophyta have the most cell density. At 4, 5 and 6 stations under the influence of agricultural drainage, urban and industrial wastewaters, the blooming of Cyanobacteria and Chlorophyta has occurred. The eutrophic level obtained eutrophic (mild) and hypereutrophic at these stations. Pearson correlation result shows that log Chla is significant with salinity at the level of p 〈0.05 and is significant with water temperature and orthophosphate at the level of p 〈0.01. According to the results, limited exchange of the Caspian Sea water has an effective role on environmental stress of the area that includes increased nutrient concentrations, temperature, salinity, concentration and density of the algal harmful species. To preventing harmful algal blooms, wastewater treatment from the primary pollution sources and using of aerobic stabilization ponds in the presence of resistant microalgae including chlorella, chlamydomonas and chroococcus is suggested.
    Description: Published
    Keywords: Diversity ; Stress ; Phytoplankton ; Nutrients ; Bloom
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.209-215
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  • 4
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    Numerical Simulation of Carbon Dioxide–Nitrogen Mixture Dissolution in Water-Saturated Porous Media: Considering Cross-Diffusion Effects (2023)
    In:  Fluids
    Details
    Publication Date: 2024-01-29
    Description: The possibility of impure carbon dioxide (CO2) sequestration can reduce the cost of these projects and facilitate their widespread adoption. Despite this, there are a limited number of studies that address impure CO2 sequestration aspects. In this study, we examine the convection–diffusion process of the CO2–nitrogen (N2) mixture dissolution in water-saturated porous media through numerical simulations. Cross-diffusion values, as the missing parameters in previous studies, are considered here to see the impact of N2 impurity on dissolution trapping in more realistic conditions. Homogeneous porous media are used to examine this impact without side effects from the heterogeneity, and then simulations are extended to heterogeneous porous media, which are a good representative of the real fields. Heterogeneity in the permeability field is generated with sequential Gaussian simulation. Using the averaged dissolved CO2 and dissolution fluxes for each case, we could determine the onset of different dissolution regimes and behaviors of dissolution fluxes in CO2–N2 mixture dissolution processes. The results show that there is a notable difference between the pure cases and impure cases. Additionally, a failure to recognize the changes in the diffusion matrix and cross-diffusion effects can result in significant errors in the dissolution process. At lower temperatures, the N2 impurity decreases the amount and flux of CO2 dissolution; however, at higher temperatures, sequestrating the CO2–N2 mixture would be a more reasonable choice due to enhancing the dissolution behavior and lowering the project costs. The results of the heterogeneous cases indicate that heterogeneity, in most cases, reduces the averaged dissolved CO2, and dissolution flux and impedes the onset of convection. We believe that the results of this study set a basis for future studies regarding the CO2–N2 mixture sequestration in saline aquifers.
    Type: info:eu-repo/semantics/article
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