Performance of Submerged Vanes for Control of Sediment in an Irrigation Canal

Tanis, Steven W.; ,

Performance of Submerged Vanes for Control of Sediment in an Irrigation Canal

by Steven W. Tanis, (M.ASCE), Salt River Project, Phoenix, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

Removal of accumulated sediments from irrigation canals is necessary in order to maintain canal capacity. Removal of these sediments may be enhanced by directing and concentrating sediments along one bank of a canal using submerged vane technology. Submerged vanes have been used to redirect the bed load sedimentation of natural waterways with the intent of controlling the natural migration of rivers and to maintain navigable channels. These vanes are flow training structures (foils) usually installed at an angle of 15? to 25? to the direction of flow and their height is generally from 0.2 to 0.4 times the design water depth. Submerged vanes so placed generate a secondary circulation in the flow which moves the bed load sediment in a desired direction. In order to evaluate the performance of these structures, twenty-nine vanes, each 0.9m high and 3.3m long, were placed in a section of the Grand Canal in Phoenix, Arizona. This paper discusses the re-distribution of sediment, and the impact of the vanes on canal capacity.

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