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Analysis of Calculation Methods for Open Channel Water Surface

Author: HuYu
Tutor: LiYuanNong
School: Northwest University of Science and Technology
Course: Hydraulic Engineering
Keywords: open channel non-uniform flow water surface profile open channel with arch bed numerical simulation VOF method
CLC: TV133
Type: Master's thesis
Year: 2008
Downloads: 425
Quote: 0
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Abstract

Since the channel slope, roughness, the cross-sectional geometry, building hydraulic structures make changes to the water depth and velocity in the open channel, which is non-uniform flow and brings much inconvenience to the calculation of water surface profile. Artificial channels and the river water are almost non-uniform flow, so the study of non-uniform open channel flow to solve the practical problems of production is of great significance.In this paper, the characteristic of open channel water surface profile is qualitative analysised, the existing water surface calculation methods are summarized and verified. On this basis, a simplified calculation formula for water surface profile on open channel with arch bed is carried out. With comparison of test results and numerical simulation results, the method has high precision in calculating on the open channel with arch bed, can be used for engineering design and provide a reliable numerical calculation.The existing sub-sum method is simple, easy to operated, in the absence of computer it needs too much human work. It can be done easily with the use of computers through a simple process . So this method gets the most widely used. Integration and charts of work because of their relatively tedious, are restricted in the application subject.In this paper, the existing water surface calculation method is only for a fixed slope, but in some major projects, sloping surface is also widely used at the end of drainage trough, such as overflow weir curve, the curve of Longtaitou, the Woqi surface, The slope can achieve very gentle slope at the end of the transition, so that there will be a smooth flow pattern at the end. These non-prismchannel, in classic hydraulic calculation is not presented in full. In the view of this, its surface -Formula was derived, that a more complete surface trough of the classic line calculation. The results will provide technical basis for the design surface.

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