| Abstrakt: |
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 depth-dependent freeboard. The cost performance of the proposed section was compared with another general open channel section (power-law) 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 power-law section, and is generally superior to the trapezoidal section. [ABSTRACT FROM AUTHOR] |
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