Planning and design of desilting basins in Himalayas-A case study

摘要

The paper highlights the planning and design aspects of desilting basins in Himalayan rivers with specific reference to Nathpa Jhakri underground hydroelectric project under execution. The project is a run-of-the-river project on river Satluj which experiences severe sediment transport. The project comprises of an underground desilting basin complex with four parallel basins, with hoppers and flushing conduits at the bottom to control undesirable sediments from entering the turbines. The design is aimed at eliminating sediments of particle size 0.2mm and above in the basins. The hydraulic performance of the proposed basin as studied on a physical model as well as simulated in a numerical model is highlighted in this paper.