TY - JOUR JF - JSTNAR JO - jwss VL - 6 IS - 3 PY - 2002 Y1 - 2002/10/01 TI - End Sill Influence on Water Surface Profile in Non- prismatic Side Channel: A Design Guideline TT - اثر سر ریز انتهایی بر نیم رخ سطح آب در کانال جانبی غیر منشوری:راهنمای طراحی N2 - Side channel spillways have a common usage in conveyance and distribution networks, high dams, water and wastewater treatment plants, and surface drainage networks. A side channel carries 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 and an end sill is also installed at the downstream end to provide a control section and to generate an even water surface profile. In this study, the impact of installing an end sill on the flow characteristics in a non-prismatic side channel is presented. Six distinct longitudinal profiles were clearly observed in each run and the difference between the mid points of the maximum and the minimum profiles of each run was used to evaluate the sill effects on the water surface profile and the energy dissipation. The results indicated that the maximum and the minimum differences are, respectively, equal to critical depth and half of it generated at the channel downstream end. Also, based on an envelope of the data, a method was proposed to determine the maximum potential impact of an end sill that might have on the flow depth, which could also be considered as a guideline in the design process. SP - 37 EP - 49 AU - S. Kouchakzadeh, AD - KW - Spatially varied flow KW - Momentum correction factor KW - Eddy loss coefficient KW - Side spillway KW - End sill KW - Water surface profile KW - Non- prismatic channels UR - http://jstnar.iut.ac.ir/article-1-41-en.html ER -