Water Science and Engineering 2017, 10(1) 78-85 DOI:   http://dx.doi.org/10.1016/j.wse.2017.03.001  ISSN: 1674-2370 CN: 32-1785/TV

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Keywords
Flood discharge
Environmental vibration
Vibration characteristics
Influencing factor
Prototype observation
Authors
Xin Wang
Ya-an Hu
Shao-ze Luo
Lu-chen Zhang
Bo Wu
PubMed
Article by Xin Wang
Article by Ya-an Hu
Article by Shao-ze Luo
Article by Lu-chen Zhang
Article by Bo Wu

Prototype observation and influencing factors of environmental vibration induced by flood discharge

Xin Wang a,b,*, Ya-an Hu a,c, Shao-ze Luo a, Lu-chen Zhang a, Bo Wu a

a Hydraulic Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210029, China
b State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China
c Key Laboratory of Navigation Structure Construction Technology of Ministry of Transport, Nanjing Hydraulic Research Institute, Nanjing 210029, China

Abstract

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 to 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 units 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.

Keywords Flood discharge   Environmental vibration   Vibration characteristics   Influencing factor   Prototype observation  
Received 2016-01-28 Revised 2016-11-11 Online: 2017-01-31 
DOI: http://dx.doi.org/10.1016/j.wse.2017.03.001
Fund:

This work was supported by the National Natural Science Foundation of China (Grants No. 51479124 and 51109143), the Open Cooperation Fund of State Key Laboratory of Hydraulics and Mountain River Engineering (Grant No. SKHL1422), and the Nanjing Hydraulic Research Institute Foundation (Grant No. Y115006)

Corresponding Authors: Xin Wang
Email: xwang@nhri.cn
About author:

References:

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