A hydraulic optimal section design method for open channel with rectangular section

Abstract

The invention discloses a hydraulic optimal section design method of a rectangular section open channel, which is based on the principle of the maximum flow modulus, and in the calculation process, the water flow continuity equation, the water flow resistance equation and the pushing mass and sediment transport rate control equation are used. The iterative calculation method comprehensively considers the influence of sediment transport and bed deformation in the open channel with rectangular cross-section on the size and shape of the channel cross-section, and fully considers the actual water flow in the channel by introducing the physical quantity in hydraulics—the flow modulus K The influence of the resistance on its water flow capacity is a hydraulic optimal section design method for rectangular artificial open channels based on the principle of maximum flow modulus. The problem of sand-river bed interaction makes up for the theoretical defects of the hydraulic optimal section design method of artificial open channels.

Description

technical field [0001] The invention relates to a method for designing a section of an open channel, in particular to a method for designing a hydraulically optimal section of an open channel with a rectangular section. Background technique [0002] Open channels are man-made or naturally formed channels with free surfaces. For the naturally formed open channel, its cross section is often divided into the main channel and the beach, showing an irregular shape. The section of artificially built channels is often determined according to geological conditions. Soil foundation is the most common in water conservancy engineering practice, and considering the stability of the channel bank slope and the limitation of construction technology, the cross-sectional shape of the soil foundation channel is generally not circular or semicircular, but mostly rectangular or trapezoidal. Gradually developed U-shaped section and parabolic section. [0003] When performing open channel hydr...

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Problems solved by technology

So far, scholars at home and abroad have done a lot of research on the optimal section of open channel hydraulics, but the results are relatively scattered, and the theoretical basis of the application is not the same, and it has not yet had a universal guiding significance

Especially in the previous studies, the influence of the sediment transport intensity and the shape of the bed surface on the flow capacity of the channel was not considered.

In fact, the water flow, sediment, and bed surface in the channel interact with each other, and the resistance distribution of the water flow is very complicated. It is unrealistic to assume that the Manning coefficient n of the bed surface is equal everywhere in the channel cross section. of the situation

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