Evaluation of Eutrophic State of Alavian Dam Reservoir Using Statistical Methods and TSI and TLI Indices | ||
| تحقیقات آب و خاک ایران | ||
| Volume 53, Issue 8, October 2023, Pages 1849-1862 PDF (1.42 M) | ||
| Document Type: Research Paper | ||
| DOI: 10.22059/ijswr.2022.333920.669132 | ||
| Author | ||
| Kameleh Aghajanloo* | ||
| Civil Engineering Department, Engineering Faculty, University of Maragheh, Maragheh, Iran | ||
| Abstract | ||
| Eutrophication is a global environmental problem that poses a serious risk to the conservation of dams lake water quality, human health and aquatic ecosystems. Indicators for determining the nutritional status of water bodies allow to make decision and to implement management strategies for controlling eutrophication. TSI and TLI indices and statistical analysis on phosphorus (TP), nitrogen (TN), chlorophyll.a (Chl.a) and Secchi depth (SD) parameters were used to assess the Eutrophic state of Alaviyan Dam Reservoir during 1394 to 1398. The results of parameter analysis showed that the values of total TSI and total TLI index for the lake in 1398 were 53.5 and 4.8, respectively, and thus the lake was placed in the eutrophic category. TN was the main cause of worsening water quality in spring, while in autumn TP had a greater portion in declining water quality. In addition, the differences between the indices indicate that during the study period, phosphorus is not a factor that limits algal productivity and the mean value of 8.8 for the TN / TP ratio emphasizes that TN is the limiting factor of primary production. Studies also showed that in addition to algae, which block light from passing to lower levels of the lake, non-algal turbidity can also affect the growth of phytoplankton. The parameters of total nitrogen, total phosphorus, and chlorophyll-a. showed increased trend, which requires input nutrient controls into Alaviyan reservoir to preserve the water quality. | ||
| Keywords | ||
| Eutrophication; Non-algal turbidity; Total nitrogen; Total phosphorus | ||
| References | ||
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