Hydraulic optimal section design method for open channel with rectangular section

Abstract

The invention discloses a hydraulic optimal section design method for an open channel with a rectangular section. The method is characterized by taking a maximum flow modulus principle as a theoretical basis, taking a water flow continuity equation, a water flow resistance equation and a bed load sediment transport rate as control equations in a calculation process, adopting an iterative calculation method, considering the influence of sediment transportation and bed surface deformation in the open channel with the rectangular cross section on the size and the shape of the water-passing cross section of the channel comprehensively, and introducing a physical quantity-flow modulus K in hydraulics to consider the influence of the actual water flow resistance in the channel on the water flow passing capacity comprehensively. The method is a method for designing the hydraulic optimal section of the artificial open channel with the rectangular section based on the maximum flow modulus principle, solves the problems that in an existing design method, the bed surface roughness value is random, and water flow-sediment-riverbed interaction cannot be considered, and makes up the theoretical defects of the method for designing the hydraulic optimal section of the artificial open channel.

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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