5/2 power parabola-shaped open channel and waterpower optimum section thereof

Abstract

The invention discloses a 5 / 2 power parabola-shaped open channel. A channel section shape of the open channel is a 5 / 2 power parabola shape and the opening of the open channel is upwards; a curve expression of a section of the 5 / 2 power parabola-shaped open channel is a formula (as shown in the specification), wherein the shape coefficient a is a formula (as shown in the specification), h is a water depth and B is a water surface width; an area of a water-carrying section of the channel is a formula (as shown in the specification); a wetted perimeter of the channel is a formula (as shown in the specification); and an optimum width to depth ratio of an optimum section of the open channel is a formula (as shown in the specification), wherein the shape coefficient a is a formula (as shown inthe specification), the normal water depth h is a formula (as shown in the specification), the critical water depth hc is a formula (as shown in the specification), the open area A is equal to 1.4916h2 and the wetted perimeter P is equal to 3.09633h. The 5 / 2 power parabola-shaped open channel is not only capable of improving the hydraulic characteristics of parabola-shaped sections, but also capable of improving the water carrying capacity.

Description

technical field [0001] The invention relates to a water conveyance channel, specifically a five-fifth power parabolic open channel and its optimal hydraulic section, belonging to the technical field of planning and design of water conveyance channels in irrigation areas. Background technique [0002] The water delivery section of the channel has a great influence on the flow capacity, water depth and construction cost of the channel. Common channel water delivery sections are trapezoidal and rectangular sections. With the improvement of channel construction technology and the application of large lining machines, the construction of curved sections is becoming easier and more popular. For example, the High Level Canal in Pakistan and the Genil-Cabra Canal in Spain [1] all adopt a square parabolic section. Scholars generally believe that the curved section has these advantages [2-4]: there are no or few corner points in the curved channel section, and there are few stress c...

AI Technical Summary

Problems solved by technology

However, in the case of the same width and depth, the bottom of the square parabola and semi-cubic parabola section is sharper, which still affects the flow capacity

However, the slope of the three-parabolic section is too steep, which is likely to cause landslides on the side slope of the channel, and the construction is difficult, so it is suitable for situations with good geological conditions.

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