Numerical Investigating the Effect of Geometrical and Hydraulic Parameters of Dam and Sediments on Hydraulic Pressure Flushing in Storage Dam Reservoirs

Authors

1 Faculty of Civil Engineering, University of Tabriz- Farazab Consulting Engineers, PMO, Tabriz, Iran

2 Faculty of Civil Engineering, University of Tabriz, Tabriz, Iran.

3 Department of Civil Engineering, Faculty of Engineering, Azarbaijan Shahid Madani University, Tabriz, Iran

4 Department of Civil Engineering, Faculty of Engineering, University of Ayatollah ozma Borujerdi, Borujerd

Abstract

The dimensions of the funnel formed owing to hydraulic pressure flushing and its volume, which is the volume of sediments poured out of the dam and equal to the amount of released volume of the reservoir reserve, are affected by geometric and hydraulic parameters related to the dam and sediments deposited in the reservoir and could be investigated by experimental and numerical methods. The effect of changing in the level of sediments accumulated in the reservoir, average diameter of sediments, uniformity and non-uniformity of size of the accumulated sediment particles as well as the number of simultaneous operating bottom outlets during the hydraulic pressure flushing operations as parameters of the dam and sediments on the geometry and volume of the flushing cone were investigated by three-dimensional numerical method using FLOW- 3D numerical model in present study. The results indicated that at a constant reservoir water level and a constant outlet flow from each bottom outlet, the dimensions and the volume of the flushing cone increase with increasing in sediment level, increasing in the number of bottom outlets acting at the same time and decreasing in sediment diameter. In order to restore the volume of the reservoir lost due to the sediment accumulation as much as possible, it is better to pressure flushing be carried out at the maximum level of sediment accumulation with a smaller fragment diameter, simultaneously operating the maximum number of outlets.

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Journal of Civil and Environmental Engineering

Articles in Press, Accepted Manuscript
Available Online from 09 July 2023

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