Sediment and Cavitation Erosion Studies through Dam Tunnels

Sediment and Cavitation Erosion Studies through Dam Tunnels

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This paper presents results of sediment and cavitation erosion through Tunnel 2 and Tunnel 3 of Tarbela Dam in Pakistan.Main bend and main branch Leather Care of Tunnel 2 and outlet 1 and outlet 3 of Tunnel 3 are concluded to be critical for cavitation and sediment erosion.Studies are also performed for increased sediments flow rate, concluding 5 kg/sec as the critical value for sudden increase in erosion rate density.

Erosion rate is Carpet concluded to be the function of sediment flow rate and head condition.Particulate mass presently observed is reasonably low, hence presently not affecting the velocity and the flow field.