Performance evaluation of correction coefficients to optimize sediment rating curves on the basis of the Karkheh dam res
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ORIGINAL PAPER
Performance evaluation of correction coefficients to optimize sediment rating curves on the basis of the Karkheh dam reservoir hydrography, west Iran Haideh Hassanzadeh 1 & Mahmood Shafai Bajestan 2 & Ghodratollah Rostami Paydar 3 Received: 13 January 2018 / Accepted: 1 October 2018 / Published online: 8 October 2018 # Saudi Society for Geosciences 2018
Abstract The prediction of useful lifetime of a dam is estimated through accurate estimate of river sediments which mostly depend on sediment rating curve. Over the past decades, various methods have been developed by investigators. With respect to the importance of this issue, in the present study, the best discharge-sediment relationship for Jelogir hydrometric station located at the upstream of Karkheh reservoir dam is presented. In the first step, sediment rating curves in annual, seasonal, monthly, wet and dry, and middle of the classes linear ways and applying 3 correction coefficients that include Smearing, FAO, and QMILE were obtained; then, their performance was evaluated. Comparison of these results with data obtained from hydrographical operation of Karkheh dam reservoir showed that the optimal equation of discharge-sediment at this hydrometric station follows annual linear sediment rating curve with QMILE correction coefficient. According to the results, annual method has estimated sediment volume less than the actual volume, about 98.7% of the actual sediment, while other evaluated methods have showed sediment volume more than the actual one, and among correction coefficients, the application of QMILE correction coefficient is more reasonable than other coefficients. Keywords Sediment . Flow discharge . Rating curve . Hydrography . Correction coefficient
Introduction Deposition of sediment in dams’ reservoirs will cause losing the useful volume of them, so determining the correct volume of sediments entered to reservoir is required to proper design of dam and also optimizing reservoir management during operation. The average annual sedimentation varies in different parts of the world, depending on the geographical location and the topographical, hydrological, and climate conditions, and on average destroys 0.3% of the total volume of dams’ reservoirs in the world, annually. This number may reach 0.5 to 1%
* Ghodratollah Rostami Paydar [email protected]; [email protected] 1
Andimeshk Branch, Islamic Azad University, Andimeshk, Iran
2
Shahid Chamran University, Ahvaz, Iran
3
Department of Geology, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
in regions such as Asia (Olesen and Basson 2004), and in Iran, this value is estimated between 0.5 and 0.75% on average, which is equals to approximately 175 to 250 million m3/year (Tolouee 2005). There are several other methods to determine sedimentation in reservoirs such as reservoir hydrography, direct measurement of the thickness of sediment in reservoir, remote sensing, using mathematical and computer models, and using hydrometric statistics; however, due to diff
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