Water quantity and quality dynamics of the THC — Tuyamuyun Hydroengineering Complex — And implications for reservoir operation (original) (raw)

Abstract

Background

In the Aral Sea basin, safe water resources are scarce and steadily becoming scarcer. Particularly high quality water is going to become a rare good.

The object of the study was the Tuyamuyun Hydroengineering Complex (THC), a complex of artificial water reservoirs located in the lower Amu Darya River, which provides water for irrigation, industry, and drinking for the lower Amu Darya region. The focus was on operation of one of its four reservoirs, the Kaparas, which is mainly used for drinking water supply. The objective includes the investigation of impacts of conventional operation schemes on the reservoir water quality for improving drinking water quality (salinity). Basic operation rules for Kaparas, which can be considered as representative for conventional dam operation under dry year conditions, had to be identified and improved operation schemes derived.

Methods

Existing data archives were analysed, and further data were acquired from field surveys, data processing and modelling studies. Historical data were identified, which are appropriate to determine representative schemes for the conventional operation. For the simulation of time-dependent and depth-dependent changes of reservoir salinisation, the reservoir water quality model Lac was used and linked with the THC model.

Results and Discussion

Modelling results for the simulation of temperature dynamics and density stratification showed a sufficient congruence with the measured temperature profiles. The conformity of measured and calculated salt concentration is basically ensured. The reservoir, which fill with higher saline water at the end of the summer, aggravates the entrainment of high saline water in the entire water column.

Conclusions

The current conventional operation regime mainly leads to filling the Kaparas reservoir with high saline water during the winter months. Even in the event of starting with comparable low salinity levels, the simulation demonstrates the rapid deterioration of the reservoir water quality. Under dry year conditions, the WHO standards for drinking water will be exceeded by 30% after two years, so that the impact of dry years in the context of water stress becomes visible.

Recommendations and Outlook

Processed data and results are now available to identify enhanced reservoir operation strategies for salinity reduction by changing the period of reservoir filling and release, as well as to initiate a detailed analysis of how water deficits in dry years may be reduced by improved operation regimes. Using adapted and enhanced operation rules for THC reservoirs, the local population within the lower Aral Sea basin might be supplied with more potable water of higher quality in future.

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References

• Crosa G, Froebrich J, Nikolayenko V, Stefani F (2005): Spatial and seasonal variations in the water quality of the Amu Darya River (Central Asia). Water Research (in press)
• Djoraev Z, Babajanov K (2004): Water resources management in Uzbekistan. Managing Water Supply Security and Food Quality, Joint workshop by INTAS and University of Hannover, 18./19. November 2004, Hannover, Germany
• Elpiner L (1999): Public health in the Aral Sea coastal region and the dynamics of changes in the ecological situation. In: Glantz MH (ed), Creeping environmental Problems and Sustainable Development in the Aral Sea Basin. Cambridge University Press, United Kingdom
  Google Scholar
• Froebrich J, Kayumov O (2004): Water management aspects of Amu Darya. In: Nihoul JCJ et al. (eds), Dying and Dead Seas — Climatic Versus Anthropic Causes. Nato Science Series: IV, Earth and Environmental Sciences, Volume 36. Kluwer Academic Publishers, Dordrecht
  Google Scholar
• Froebrich J (2000): Vorhersage der mehrjährigen Wassergüteentwicklung in Speichern mittels eines deterministischen Modells. (Prognosis of water quality dynamics in reservoirs by use of a deterministic model), Cuvillier Verlag Goettingen, Germany
  Google Scholar
• Herbst S (2004): personnel communication
• Hurley Octavio KA, Jirka GH, Harleman DRF (1977): Vertical heat transport mechanisms in lakes and reservoirs. Report No. 227, R. M. Parsons Laboratory for Water Resources and Hydrodynamics, Department of Civil Engineering, Massachusetts Institute of Technology
• Ikramova M, Sorokin A, Khodjiev A, Misirkhanov H, Karimov B (2004): High quality water to the Amudarya Lower’s population. Uzbekistan Agriculture, No. 12, Tashkent
• IWLP (2005): International Water Law Project 2000–2005. Available at 〈 http://www.internationalwaterlaw.org/ 〉
• Kayumov O, Ikramova MR (1997): Influence of Tuyamuyun Hydrosystem on bed processes and water intake in Amu Darya lowers. Uzbekistan Agriculture, No. 2, Tashkent
• Schwerdhelm R (1992): Daten und Gleichungen zur Berechnung der Guetevorgaenge in Gewaessern. (Data and equations for the computation of the quality procedures in water bodies.) Unpublished internal documentation, Water quality protection and management, University of Hannover, Germany
  Google Scholar
• Sorokin A, Ikramova M (2005): Modelling studies Tuyamuyun Hydro Complex model. Internal report
• UNEP/GRID-Arendal (2005): National Report of Uzbekistan for Nature Protection 2000. Available at 〈 http://enrin.grida.no//htmls/uzbek/report/index.htm 〉
• Wegerich K (2004): Coping with disintegration of a river-basin management system: multidimensional issues in Central Asia. Water Policy, Vol. 6, pp 335–344
  Google Scholar
• World Health Organization (WHO) (2004): WHO Guidelines for drinking-water quality, third edition. World Health Organization (WHO) 2004, ISBN 9241546387, 515 pages. Available at 〈 http://www.who.int/water_sanitation_health/dwq/gdwq3/en/index.html 〉

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Authors and Affiliations

1. Water Quality Protection and Management, University of Hannover, Am Kleinen Felde 30, 30167, Hannover, Germany
   Jochen Froebrich, Melanie Bauer & Oliver Olsson
2. Central Asian Research Institute of Irrigation (SANIIRI), Karasu-4, 11, 700187, Tashkent, Uzbekistan
   Malika Ikramova

Authors

1. Jochen Froebrich
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2. Melanie Bauer
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3. Malika Ikramova
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4. Oliver Olsson
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Correspondence toJochen Froebrich.

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Froebrich, J., Bauer, M., Ikramova, M. et al. Water quantity and quality dynamics of the THC — Tuyamuyun Hydroengineering Complex — And implications for reservoir operation.Env Sci Poll Res Int 14, 435–442 (2007). https://doi.org/10.1065/espr2006.01.012

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• Received: 16 August 2005
• Accepted: 21 October 2005
• Published: 22 October 2005
• Issue Date: September 2007
• DOI: https://doi.org/10.1065/espr2006.01.012

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