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The effect of a curved bed on the discharge equation in a spillway with a breast wall

Journal of Hydrodynamics 2015年第2期27卷 311-318页

作者： NGUYEN Cong-Thanh 王玲玲唐洪武 State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering College of Water Conservancy and Hydropower Engineering Hohai University

The flow through a breast wall spillway is greatly affected by the centripetal force due to a downstream curved profile. Therefore, the mean vertical pressure distribution at the outlet section is not consistent with the hydrostatic pressure law. This distribution in turn affects the discharge capacity of the breast wall spillway. This paper experimentally studies the effect of a convex downstream profile on the mean pressure variation and the discharge of a breast wall spillway without gates. It is indicated that the effect of the curvilinear streamline on the mean vertical pressure variation is significant. The regression analysis method is used to determine the water head effect Z o of the orifice opening through the mean pressure variation. A discharge prediction formula of the breast wall spillway is obtained under the limited conditions of a laboratory flume. The predicted discharge is compared to the measured discharge. A good agreement is evidenced for the free orifice flow with errors within ？5%, while a big error（20% or even more） is obtained if the hydrostatic pressure law is used for the determination of Zo.

关键词： curved bed spillway breast wall multiple linear regression orifice flow mean pressure distribution

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Determination of Partial Factors of breast wall on Top of Sloping Breakwater

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China Ocean Engineering 1996年第4期11卷 409-418页

作者： Lu Jianghua Xie Shileng Engineer, Planning and Design Institute for Water Transportation, Ministry of Communications, Beijing Professor, Senior Engineer, First Design Institute of Navigation Engineering, Ministry of Communications, Tianjin Plan. Des. Inst. for Water Transp. Ministry of Communications Beijing First Des. Inst. of Navig. Eng. Ministry of Communications Tianjin

By applying the theory of structural reliability, reliability analyses for the stability of a breast wall on the top of a sloping breakwater are carried out. Based on the analyses, the method for determining partial action / load factors and partial resistance factors of breast walls is expounded, and the design expressions with partial factors are given. The values of partial action / load factors and partial resistance factors are recommended preliminarily according to the computation for breast walls with typical cross-sections.

关键词： breast wall sloping breakwater reliability partial factor

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Calculating Method and Verification of Wave Pressure Distribution on the breast wall of Mound Breakwater

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China Ocean Engineering 1992年第4期7卷 491-498页

作者： Lu Wujiang Associate Prof., Hohai University, 210024, Nanjing

In this paper, the calculating charts and formulae about wave pressure on the breast wall are derived with seven parameters on the basis of physical model study. The verification shows that the charts agree with the e... 详细信息

关键词： breakwater breast wall wave pressure distribution safety factor

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Wave Pressure Distribution over the breast wall of Mound Breakwater of Small Ports

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China Ocean Engineering 1994年第4期9卷 411-424页

作者： Lu Wu JiangAssociate Professor, Hohai University, Nanjing 210024

In this paper, the mechanism of the interaction between the breast wall of mound breakwater and waves is expounded, then some new views and the law of variation of horizontal and vertical wave pressure over the breast wall are put forward. The results of this study have been adopted in the Specifications of Fishery Harbour Breakwater by the Ministry of Agricultures.

关键词： breast wall wave pressure distribution uplift pressure horizontal pressure mound breakwater

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