Document Type : Research Paper

Authors

1 Professor, Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran

2 Ph.D. Scholar, Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran

3 Assoc. Professor, Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran

Abstract

The present study was conducted to assess the water quality of the Balighli-Chai and Ghare-Sou Rivers, the main rivers of Ardabil Province, Iran. The levels of dissolved oxygen (DO), biochemical oxygen demand (BOD), nitrate (NO3) and phosphate (PO4) were measured and simulated using the QUAL2Kw model during low- and high-water periods. Also, self-purification capacity and total maximum daily load (TMDL) levels of water quality parameters were calculated. The obtained results indicated considerable differences between the levels simulated by the model from the measured data for both rivers. Most of the river sections had low self-purification capacities. Maximum self-purification capacity (%) were: high water period: DO = -226.61; BOD5 = 90/30; NO3 = 99.88; PO4 = 96.49; low water period: DO = -281.71; BOD5 = 89.13; NO3 = 94.74; PO4 = 90.21. TMDL scores for DO, BOD5 and NO3 were higher during the high-water period, but entire sections of both rivers showed high excess loads of PO4. The results showed that most ranges of both rivers didn't have appropriate water quality conditions. Therefore, it is necessary to make proper decisions to control pollution levels and improve water quality in this basin

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Main Subjects

Abedi-Koupai, J., Nasri, Z., Talebi, Kh. Mamanpoush, A., & Mousavi, S.F. (2011). Investigation of Zayandehrud water pollution by diazinon and its assimilative capacity. J. Water Soil Sci., 15(56),1-20. [In Persian]. DOI: 20.1001.1.24763594.1390.15.56.1.1
Akbarzadeh, A., Mirbagheri, S. A, Bashiri, S., & Mousakhani, M. (2013). Calculating total maximum daily load (TMDL) of nutrients in Anzali Wetland basin. Proc. 2013, The first national conference on water reuse. Iran, Tehran [In Persian].
APHA. (2005). Standard methods for examination of water and wastewater. American Public Health Association. Washington, DC. DOI: 10.1016/0048-9697(94)90332-8
Areeyaeinejad, R., Sarai Tabrizi, M., & Babazadeh, H. (2019). Modeling water quality of rivers using QUAL2Kw model (Case Study: Shahroud River). J. Environ. Sci. Technol., 21(7), 1-13. [In Persian] DOI: 10.22034/JEST.2018.30267.3894.
Azimi, M. M., Ghavasieh, A. R, Hashemi, S. H., Barakatain, S., & Jafari Gol, F. (2010). Assessment of river selfpurification using the results of qualitative simulation (case study: Sefidrood River). Proc. 2010, Water national conference with clean water approach. Tehran [In Persian].
Babamiri, O., Marofi, S., & Azari, A. (2020). An investigation into self-purification and modeling of changes in nitrogen and phosphor along Dez River (The distance between Dez Dam and Band Ghir Bridge). J. Environ. Sci. Technol., 22(3), 301-315. [in Persian] DOI: 10.22034/JEST.2020.31130.3948.
Chapra S., Pelletier G., & Tao H. (2008). QUAL2K: A modelling framework for simulating river and stream water quality, Version 2.11. Documentation and user's manual. Civil and Environmental Engineering Department, Tufts Unversity, Medford.
Department of Environment (2016). Water quality standards. Tehran. P14. [In Persian]
Heidarpour, M., & Jamshidi, S. (2019). Determining total allowable pollution and waste load allocation in rivers regarding seasonal variations, a framework for local multi-parameter water quality standardization and monitoring. J. Environ. Stud., 44(3), 519-531 [In Persian] DOI: 20.1001.1.10258620.1397.44.3.9.8.
Hoseini Y. (2019) Study the selfpurification capacity and water quality of Qarahsoo River using Qual2kw and NSFWQI models. Wetland Ecobiol., 11(3), 41-60 [In Persian].
Khalili R., Parvinnia M., & Motaghi H. (2020). Evaluation of Bashar River water quality using CCME water quality index. J. Environ. Sci. Stud., 5(3), 2807–2814 [In Persian]
Lotfi, A. (2012). Guideline on rapid assessment of environmental features of rivers. Ghalam Azin Chap. 1st edition. Tehran. 120 pp. [in Persian]
Maghsoudi R., Abedi Koupai J., & Mir Abbasi Najafabadi R. (2021) Investigation of the effects of Beheshtabad river water abstraction on downstream water quality. Iran. J. Soil Water Res., 52(9), 2485-2499 [In Persian] DOI: 10.22059/IJSWR.2021.327872.669036.
Meftah Halghi, M. (2009). Estimating of maximum allowable pollutant in Gorganrood River. J. Water Soil Conserv., 16(1), 19-34 [In Persian].
Merchán, D., Sanz, L., Alfaro, A., Pérez, I., Goñi, M., Solsona, F., & Casalí, J. (2020). Irrigation implementation promotes increases in salinity and nitrate concentration in the lower reaches of the Cidacos River (Navarre, Spain). Sci Total Environ., 706, 135701. DOI. 10.1016/j.scitotenv.2019.135701
Mohammadi, B., Zeinolabedini, N., Fataei, A., & Naderi, W. (2015). Assessment of Gharasoo River water quality regarding river selfpurification capacity. Proc. 2015, The first national conference on environmental science and management. Iran, Ardabil. [in Persian]
Nikakhtar, M., Rahmani, S. H., & Massah Bovani, A. R. (2020) Simulating water quality of Ardak River (Khorasan Razavi) using QUAL2KW. J. Environ. Sci. Technol., 21(11), 93-105 [In Persian] DOI: 10.22034/JEST.2020.29264.3781.
Nooshadi, M., & Hatamizadeh, M. R. (2011). Determination and simulation of water quality in the Kor River using QUAL2k model. Iran. J. Irrig. Drain., 3(4), 338-349 [In Persian].
Pelletier, G. J., & Chapra, S. C. (2008). Qual2kw-theory and documentation (Version 5.1) A modeling
framework for simulating river and stream quality. Washington Department of Ecology-Washington State.
Rafiee, M., Akhond Ali, A. M., Moazed H., & Steve W. L. (2017). A case study of water quality modeling of the Gargar River. J. Iran. Water Sci., 35, 25-36 [In Persian].  DOI: 10.22055/JHS.2014.10533
Shokri, S., Hoshmand, A. and Moazed, H. (2015) Ammonium and nitrate quality simulation in GarGar rivers using QUAL2KW model. Wetland Ecobiol., 7(1), 57-68 [In Persian].
Yuceer, M., & Coskun, M. (2016). Modeling water quality in rivers: a case study of Beylerderesi River in Turkey. Appl. Ecol. Environ. Res., 4(1), 383-395.