Investigating the trophy condition of Miankaleh wetland using TSI and TRIX index

Document Type : Research Article

Authors

1 Master's degree in Water Resources Engineering, Department of Water Sciences and Engineering, Faculty of Agricultural Engineering, Sari University of Agricultural Sciences and Natural Resources.

2 SANRU

3 Member of the scientific faculty of Mazandaran University of Science and Technology

Abstract

The present study was conducted to investigate the water quality characteristics and nutritional status of the Miankaleh wetland using the Carlson Trophy Index (TSI) and TRIX. Measurement of parameters has been done during 6 seasons and 8 sampling periods in 6 stations of Dahane-ye-chopoghli, Bandar-e-Gaz, Gharehsu, Galogah, Ismaeilsay, and Miyan-ghaleh. Based on the results, Dahane-ye-chopoghli, and Gharehsu stations respectively have the highest amounts of phosphate (0.12 mg/l), nitrate (11.04 mg/l), the lowest DO (87 mg/l) and the highest BOD (mg/l 14/77) which indicates the unfavorable condition of the wetland in terms of quality. Calculation of TSI index based on TP shows that Miankaleh wetland is in hypertrophic condition (70-80) in four stations of, Dahane-ye-chopoghli, Gharehsu, Galogah, and Miyan-ghaleh and in eutrophic condition (60-70) in Bandar-e-Gaz and Ismaeilsay stations. On the other hand, based on TN, except for the Galogah station, which is in hypertrophic condition (70-80), the rest of the stations are in acute hypertrophic condition (80-100). Also, based on P/N, all the studied stations of the Miankaleh wetland are in mild mesotrophic conditions (30-40). In general, based on the total TSI index (29.62), the status of the wetland is in the eutrophic range (60-70). The results obtained for TRIX show that the two stations of Dahane-ye-chopoghli, and Galogah are in the mesozotrophic range (4-5) and the rest of the stations are in the oligotrophic range (2-4), which indicates the unfavorable condition of the wetland in terms of tropism. The main cause of these conditions is the discharge of sewage and drains from different units on the edge of the lagoon, which contain large amounts of nitrate and phosphate compounds.

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References

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Amirkabir Journal of Civil Engineering
Volume 55, Issue 12
2024
Pages 2527-2540

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