Author(s): S. Kouchakzadeh; A. Marashi
Linked Author(s): Salah Kouchakzadeh
Keywords: Spatially varied flow; Side spillway; End sill; Water surface profile; Non-prismatic channels
Abstract: Side channel spillways are commonly employed in surface irrigation and drainage networks, high dams, and water and wastewater treatment plants. A side channel caries spatially varied flow with increasing discharge and their water surface profiles is a main feature in the design process. Usually, the bottom width of the channel is flared in the flow direction, an end sill is also installed at the down stream end of the structure to act as a control section and to provide a desirable flow condition within the channel. In this research the impact of installing an end sill on flow characteristics in a non-prismatic side channel was experimentally investigated. Six distinct longitudinal profiles were clearly observed in each run. Two of these profiles comprise the line of the highest and the lowest points along the channel. The difference between the profiles elevation was utilized to assess the sill effects on the flow characteristics, the 3D water surface, and the energy dissipation of the incoming flow. Based on an envelope drawn to the data, a design guideline was proposed to determine the maximum potential impact that an end sill might have on the flow characteristics.
Year: 2003