The effect of dam construction on the hydrological indicators of Shamil and Nyan dams in Hormozgan province

Document Type : Research Article


1 Associate Professor, Department of Hormoz Studies and Research Center, Hormozgan University, Iran

2 Ph. D Student , Department of Natural Recourses, Tarbiat Modares University, Iran

3 Ph. D, Department of Agriculture and Natural Recourses Gorgan University, Iran

4 Ph. D , Department of Natural Recourses Tarbiat Modares University

5 Associate professor, Department of Minab High Education College, Hormozgan University, Iran



It is necessary to evaluate the effects of the construction of man-made structures, including dams, on river regimes to optimally exploit water resources. Therefore, in the current study, the effects of the construction of the Shamil and Nyan dams in Hormozgan province on the hydrological indicators and environmental flow components of the Shamil River were evaluated and analyzed using IHA hydrological indicators. The results of the evaluations showed that the construction of the Shamil and Nyan dams has changed the flow regime. After the construction of Shamil and Nyan dams, the flow of the river has decreased only from the middle of November to the end of February at the same time as the harvesting of off-season crops in Hormozgan province, and the flow of the Shamil river has increased in the rest of the months. Also, floods with a return period of more than 10 years after the construction of the dam did not occur and the trend of small floods after the construction of the dam became regular so that the peak discharge of small floods in the period before the construction of the dam was 80.23 and in the period after the construction of the dam was 75.50 m3.s-1 and has decreased by about 6%. Day numbers of minimum flow have increased from 294 days before the construction of the dam to 301 days after the construction of the dam. On the other hand, the low limit flow timing index showed that the lowest flow limit changed from 46 days after the construction of the dam to 275 days in the period after the construction of the dam. The results of the present study can be used as a basis for the sustainable management of water resources of the Shamil River.


Main Subjects


  • Kumar A. U, Jayakumar K. V. Hydrological alterations due to anthropogenic activities in Krishna River Basin, India. Ecological Indicators, 2020; 108: 105663.
  • Zangi darestani M, Abasnezhad A. Environmental impact assessment Safaroud Rabor dam on downstream areas. Journal of environmental geology. 2017; 10(37): 57-67.  [Persian]
  • Lu W, Lei H, Yang D, Tang L, Miao Q. Quantifying the impacts of small dam construction on hydrological alterations in the Jiulong River basin of Southeast China. Journal of Hydrology. 2018; 567: 382-392.
  • Richter B. D, Baumgartner J. V, Braun D. P, Powell J. A spatial assessment of hydrologic alteration within a river network. Regulated Rivers: Research & Management. An International Journal Devoted to River Research and Management. 1998; 14(4): 329-340.
  • Sojka M, JaskuĊ‚a J, Wicher-Dysarz J, Dysarz T. Assessment of dam construction impact on hydrological regime changes in lowland river–A case of study: The Stare Miasto reservoir located on the Powa River. Journal of Water and Land Development. 2016; 30(1): 119-125.
  • Song X, Zhuang Y, Wang X, Li E, Zhang, Y, Lu X, et al. Analysis of hydrologic regime changes caused by dams in China. Journal of Hydrologic Engineering. 2020; 25 (4): 05020003.
  • Mezger G, del Tánago M. G, De Stefano L. Environmental flows and the mitigation of hydrological alteration downstream from dams: The Spanish case. Journal of Hydrology. 2021; 598: 125732.
  • Islam A. R. M. T, Talukdar S, Akhter S, Eibek K. U, Rahman M. M, Pal S, et al. Assessing the impact of the Farakka Barrage on hydrological alteration in the Padma River with future insight. Sustainability. 2022;14 (9): 5233.
  • Panditharathne R, Gunathilake M. B, Chathuranika I. M, Rathnayake U, Babel M. S, Jha M. K. Trends and Variabilities in Rainfall and Streamflow: A Case Study of the Nilwala River Basin in Sri Lanka. Hydrology. 2023; 10 (1): 8.
  • Khosravi gh, Sadodin A, Ownegh M, Bahremand A, Mostafavi H. Classification and identification of changes in river flow regime using the Indicators of Hydrologic Alteration (IHA) Case study: (The Khormarud River- Tilabad Watershed- Golestan Province). Ecohydrology. 2019; 6(3): 651-671.  [Persian]
  • Daiechini F, Vafakhah M, Moosavi V. Impacts of the Golestan and Voshmgir Dams on Indicators of Hydrologic Alterations in the Gorganroud River Using Range of Variability Approach. Ecohydrology. 2020; 7(3): 595-607.  [Persian]
  • Naderi M, Sheikh V, Bahremand A, Bairam Komaki C, Ghangermeh A. Analysis of river flow regime changes using the Indicators of Hydrologic Alteration (Case study: Hableroud watershed). Water and soil management and modeling. 2022; 3(3): 1-19.[Persian]
  • Shamil-Nyan dam basic studies report. Studies to determine the quantitative and qualitative boundaries of Minab (Esteghlal), Shamil and Niyan dams. Jamab Consulting Engineers Company. 2017; 36 pp.  [Persian]
  • Kendall M. G. Rank and product-moment correlation. Biometrika. 1949; 177-193.‏
  • Madadi H, Ashrafzadeh M. R. The effect of Karkhe Dam on the spatial distribution pattern of riparian forests in Karkhe National Park. Applied Ecology. 2013; 1 (2): 1-13.  [Persian]
  • Talukdar S, Pal S. Impact of dam on flow regime and flood plain modification in Punarbhaba River Basin of Indo-Bangladesh Barind tract. Water Conservation Science and Engineering. 2018; 3(2): 59-77.
  • Legleiter C. J. Downstream effects of recent reservoir development on the morphodynamics of a meandering channel: Savery Creek, Wyoming, USA. River Research and Applications. 2015; 31(10): 1328-1343.
  • Zhang Q, Zhang Z, Shi P, Singh V.P, Gu X. Evaluation of ecological instream flow considering hydrological alterations in the Yellow River basin, China. Global and Planetary Change. 2018; 160: 61-74.
  • Zhang Q, Gu X, Singh V. P, Chen X. Evaluation of ecological instream flow using multiple ecological indicators with consideration of hydrological alterations. Journal of Hydrology, 2015; 529: 711-722.
  • Khatar B, Shokoohi A, Evaluating and Modifying the Texas Method as a Hydrologic Method for Prescribing Ecological Regime in Perennial Rivers. Journal of water and soil resources conservation. 2020; 9 (3): 31-46.  [Persian]
Volume 10, Issue 2
July 2023
Pages 263-274
  • Receive Date: 01 January 2023
  • Revise Date: 31 January 2023
  • Accept Date: 13 March 2023
  • First Publish Date: 04 April 2023
  • Publish Date: 22 June 2023