Numerical Analysis of a Two-Layer Dynamic Thermal Stratification Model for Saveh Lake in Iran
Journal Title: Journal of River Engineering - Year 2014, Vol 2, Issue 1
Abstract
To examinethe thermal stratification of Saveh dam reservoir a two-layer model was developed and its differential equations were solved using Runge-Kutta numerical method. The influences of inflow temperature and solar radiation in the reservoir temperature were examined by a sensitivity analysis. In the first case the inflow temperature to the reservoir increased by 60% and then decreased by 40%. In the second case ±20% changes of solar radiation was applied to the model.Comparingthe simulatedvaluesby themodeland themean of measuredvaluesin the dam reservoir above and below thermocline layer proved that the model has acceptable results for predicting surface and deep water temperature (R2 was 0.98).Results indicated that inflow temperature changes are synchronized with reservoir temperature, but solar radiation changesaffectedsignificantlythetemperature of thewater in the reservoir.Depending on the value of changes employed, the solar radiation caused more than ±13% change in the surface water temperature and more than ±10% change in the bottom water temperature. Moreover, depending on the value of changes employed, the inflow temperature caused less than ±11% change in the surface water temperature and less than ±7% change in the bottom water temperature.Numerical analyses indicated that 60% of times during annual year the reservoir shows thermal stratification. Consequently, in January, February, March and April, there was no perceptible stratification in the reservoir while in May, June, July, August, and late September stratification in reservoir was considerable.
Authors and Affiliations
Majid Ehteshami - Majid Bagheri - Siavash Poryousefy - Zahra Bagheri - Maysam Afshari
Keywords
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