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prototype observation and influencing factors of environmental vibrationinduced by flood discharge

Water Science and Engineering 2017年第1期10卷 78-85页

作者： Xin Wang Ya-an Hu Shao-ze Luo Lu-chen Zhang Bo Wu Hydraulic Engineering Department Nanjing Hydraulic Research InstituteNanjing 210029China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Nanjing Hydraulic Research InstituteNanjing 210029China Key Laboratory of Navigation Structure Construction Technology of Ministry of Transport Nanjing Hydraulic Research InstituteNanjing 210029China

Due to a wide range of field vibration problems caused by flood discharge at the Xiangjiaba Hydropower Station, vibration characteristics and influencing factors were investigated based on prototype observation. The results indicate that field vibrations caused by flood discharge have distinctive characteristics of constancy, low frequency, small amplitude, and randomness with impact, which significantly differ from the common high-frequency vibration characteristics. Field vibrations have a main frequency of about 0.5-3.0 Hz and the characteristics of long propagation distance and large-scale impact. The vibration of a stilling basin slab runs mainly in the vertical direction. The vibration response of the guide wall perpendicular to the flow is significantly stronger than it is in other directions and decreases linearly downstream along the guide wall. The vibration response of the underground turbine floor is mainly caused by the load of unit operation. Urban environmental vibration has particular distribution characteristics and change patterns, and is greatly affected by discharge, scheduling modes, and geological conditions. Along with the increase of the height of residential buildings, vibration responses show a significant amplification effect. The horizontal and vertical vibrations of the 7th floor are, respectively, about 6 times and 1.5 times stronger than the corresponding vibrations of the 1st floor. The vibration of a large-scale chemical plant presents the combined action of flood discharge and working machines. Meanwhile, it is very difficult to reduce the low-frequency environmental vibrations. Optimization of the discharge scheduling mode is one of the effective measures of reducing the flow impact loads at present. Choosing reasonable dam sites is crucial.

关键词： Flood discharge Environmental vibration Vibration characteristics Influencing factor prototype observation

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THE prototype observation OF JET-FLOW ATOMIZATION

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Journal of Hydrodynamics 1993年第4期5卷 63-68页

作者： Hu Min-liang Wuhan University of Hydraulic & Electric Engineering,Wuhan 430072,P.R.China

The paper introduces the significance of prototype observations of jet-flow atomization and the survey of Xiangkeyian hydropower *** presenting briefly the processes forming jet-flow atomization and the main factors affecting on it,the paper puts emphases on analysing and studying the influence ranges of various jet-flow atomization regions. It is just imperative to forecast these today in hydraulic and electric projects.

关键词： jet-flow atomization prototype observation influence range

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Quantitative study of degradation coefficient of pollutant against the flow velocity

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Journal of Hydrodynamics 2017年第1期29卷 118-123页

作者：黄本胜洪昌红杜欢欢邱静梁馨谭超刘达 Guangdong Research Institute of Water Resources and Hydropower Guangzhou 510610China Estuarine Water Technology National Local United Engineering Laboratory Guangzhou 510610China Zhongjiao Guangzhou Chanel Bureau Ltd. Guangzhou 510221China

The pollutant degradation coefficient is one of the key parameters to describe the water quality change, for establishing a reasonable water quality model and to determine the water carrying capacity and the environmental capacity. In this research, the environmental channel experiment is conducted to simulate the degradation evolution of the COD and NH3-N under different flow velocity conditions in typical pollution water. It is shown that the processes of the COD and the NH3-N＇s concentration over time are quite consistent with the first-order kinetic equation and the degradation coefficients increase with the increase of the flow velocity. When the flow velocity varies from 0 m＇s-1 to 0.87 m.s l, the degradation coefficients of the COD and NH3-N increase from 0.011 d-1 to 0.071 d-1 and 0.038 d-1 to 0.258 d-1, respectively. Moreover, the COD and NH3-N＇s degradation coefficients both have excellent correlation with the reaction time. There is a good linear relationship between the COD degradation coefficient and the flow velocity as well as a good power exponential function between the NH3-N degradation coefficient and the flow velocity. The compa- rative analysis of the Youth canal prototype monitoring and the calculation results shows that the quantitative formula obtained from the indoor water channel experiments gives results very close to the prototype observation results, which could reflect the degra- dation of pollutants in river water with varying flow velocity.

关键词： Degradation coefficient carrying capacity prototype observation flow velocity

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Reinforcement of Soft Foundation with Geotextile and observation for Sea Dike Project of Zhapu Port

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海洋工程：英文版 2003年第2期17卷 295-306页

作者：章香雅郑祖祯 Design Institute of Bureau of Qiantang River in Zhejiang Province

The design method of reinforcement of soft foundation with geotextile for the sea dike of the Zhapu Port is discussed in this paper. The prototype behaviours such as pore water pressure, settlement and so on were observed. The degree of consolidation is found out from observed pore water pressure and observed settlement respectively, then the strength increment of soil is calculated and compared with that obtained from vane shear tests. For the use of observed pore water pressure, the consolidation coefficient of soil is deduced approximately with a method named experimental exponential interpolation. The degree of consolidation of the ground is deduced theoretically from the dissipation of pore water pressure. Besides, the logarithmic curve and hyperbola are used to fit the observed time-settlement curve, and the degree of consolidation of soil is obtained according to the definition of the consolidation degree. After preliminary verification with observed prototype data, the method to reinforce the low dike with geotextile is considered to be simple and rational, and it can also reduce the construction cost.

关键词： geotextile reinforcement soft foundation design prototype observation analysis

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