Authors: Said M Easa Ali R Vatankhah
Publish Date: 2014/04/25
Volume: 18, Issue: 4, Pages: 1197-1204
Abstract
This paper presents a new general open channel section with elliptic sides and horizontal bottom The proposed section produces special channel forms such as a circular section with a horizontal bottom a circular section and a rectangular section Exact and approximate formulas for the area and perimeter of the channel are derived These formulas are then used to develop an optimization model for determining the optimal section design that minimizes the total construction cost for excavation and composite linings In addition the most hydraulically efficient elliptic section was derived The constraints of the optimization model include channel discharge and physical requirements such as flow depth top width and side slope with fixed or depthdependent freeboard The cost performance of the proposed section was compared with another general open channel section powerlaw and the trapezoidal section using different design scenarios The results show that the new section is substantially more economical and more flexible than the existing powerlaw section and is generally superior to the trapezoidal section
Keywords: