Field study of sediment and current of Karoun and Arvandroud rivers, in flood conditions

Document Type : پژوهشی

Authors

Department of physical oceanography-Faculty of ocean sciences- Khorramshahr university of marine sciences and technology

Abstract

In the March and April of 2019, a huge flood covered several provinces in the southwest of Iran and the route of these floods was finally Karun and Arvanroud rivers through Khuzestan province. The purpose of this study is to measure the current speed and direction, temperature, salinity, water level, suspended sediment concentration, sediment transportation, discharge of Karun and Arvanroud rivers in flood conditions. In tidal rivers such as Karun River in Khorramshahr and Arvanroud River at the Iran-Iraq border, the tidal wave causes severe changes in flow pattern, and water level, so that requires continuous measurement over a tidal cycle (about 24 hours) to estimate a net flux of water and suspended sediment. Field measurements were performed on 5th April 2019 in spring tide in two stations in Karun and Arvanroud rivers. Analysis of the data shows that in flood conditions, water level fluctuations reduced drastically, so that the tidal range in Khorramshahr has decreased from about 100 cm to 26 cm. The average of salinity and current speed in Karun and Arvanroud stations were 0.62psu and 2.1psu, and 1.6m/s and 1.9m/s respectively. The direction of the flow, against the usual, was continuously towards the sea. The maximum suspended sediment concentration were 380g/m3 and 67g/m3 at Karun and Arvanroud stations, respectively. According to the above data, the average water discharge in Karun and Arvanroud were 2153m3/s and 7883m3/s, and the average sediment flux were 142 kg/s and 454 kg/s, respectively.

Keywords

References

 Adib, A. & Vaqefi, M. (2010), Determining the rating curve and converting it into regression
relations in tidal Karun River, 5th National Congress of Civil Engineering, Mashhad (in
Persian)
Afshin, Y., (1993). Rivers in Iran, Ministry of Energy-Jamab Consulting Engineers. pp. 255–257
(in Persian)
Narrative of the Floods in Iran (2018-2019). Special Committee for the National Flood Report,
Institution of the Presidency, First Report, Event Description, 122 pages (in Persian)
Sadri Nasab, M., Fayyaz Mohammadi, M., Chegini, V., & Ashtari Larki, A., (2019). The effect
of river meander on suspended load concentration and water level fluctuations; Case study:
Arvand River, Journal of Marine Science and Technology, 18(2), 76-89 (in Persian). 

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History

  • Receive Date: 06 March 2021
  • Revise Date: 08 November 2021
  • Accept Date: 09 October 2021

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