Monitoring and early warning method of dammed lake bursting
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A monitoring, early warning and signal technology, which can be used in measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., and can solve problems such as lack of universality
Active Publication Date: 2017-08-15
INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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This method has a certain black box type. The rise of water level is the cause of the collapse of the barrier lake, but it is not an inevitable factor. This method is not universal, and it will never work for the collapse of the barrier lake caused by seepage and sliding.
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Embodiment 1
[0040] Such as Figure 1 to Figure 8 As shown, the method of the present invention is used to monitor and timely warn a certain barrier lake.
[0041] Vibration acceleration sensors are arranged in an array around the formation area of the barrier lake, such as figure 1 As shown (the triangle in the figure shows the sensor, and the five-pointed star shows the center of the barrier lake). The sensors are installed on the bedrock on the bank of the channel near the barrier dam. The sensor collects and transmits the original signal to the operation center in real time, and the operation center obtains the original time-amplitude signal according to the figure 2 The technical solution shown in the process is implemented.
[0042] The following implementation manners demonstrate the data processing of a sensor as an example.
[0043] Step S1, denoising processing
[0044] The original signal filters out the DC component, long-period offset, and low-frequency anomalies in th...
Embodiment 2
[0068] Calculate the energy scale of the rockfall during the barrier lake breach. The same as Embodiment 1 will not be repeated, and the difference is that: at the determined time T 2 Then enter step S5 at the same time.
[0069] Step S5, Calculation of impact energy scale of rockfall
[0070] Step S51, energy simulation calculation start and end time identification
[0071] Using STA / LTA method for T 2 = 192s for vibration recognition of the filtered signal. Set short period t S =0.05s, long period t L =1s, STA / LTA ratio threshold R SL =3, the window function ω[n] is a Hanning window with a length of 128. Set the amplitude lower limit threshold A min = 10%A max , A max is t 1 The maximum value of amplitude in the time interval from time t to time t ( Figure 9 in PGV).
[0072] The calculation result shows ( Figure 9 ), the rockfall energy simulation calculation start time t 1 =194s, corresponding to amplitude A 1 =0.3, the rockfall energy simulation calculat...
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Abstract
The invention provides a monitoring and early warning method of dammed lake bursting, so that a defect that vibration signals resulted form stone, soil and water motion changes during a dammed lake motion process can not be applied to dammed lake bursting study in the prior art can be overcome. According to the method, an operation center processes an original signal; denoising processing, signal determination and identification of a vibration amplitude index, and successive determination and identification of vibration signals in frequency zones of 1.5Hz to 10Hz, 0Hz to 1.5Hz, and 10Hz to 45Hz based on STFT transformation are carried out; and then whether stone falling, soil mass collapsing and destroying, and dammed lake bursting occur is determined. In addition, the invention also discloses a method for calculating a falling stone energy scale. According to the invention, an amplitude analysis, an energy analysis, a frequency analysis, and a signal power spectral density PSD are combined into one; and different signal analysis indexes and analysis methods are employed at different determination levels, so that the determination and identification accuracy is high. On the basis of the reliable principle, the calculation process is implemented scientifically and simply; the implementation instrument is simple and can be installed conveniently; the measurement result precision is high; and the method is suitable for meeting needs in an engineering field.
Description
technical field [0001] The invention relates to a method for monitoring and early warning of a dammed lake outburst, in particular to a method for monitoring and early warning of a dammed lake outburst by analyzing vibration signals, and belongs to the technical field of vibration signal monitoring and measurement and the field of geological disaster early warning. Background technique [0002] Vibration signals refer to signals generated by non-stationary objects. Since the non-stationary state is the absolute state of the object, the vibration characteristics and the generated vibration signals become the inherent characteristics of the object. In the excited state, if the excitation of the vibration source is the same as or close to the intrinsic characteristic parameters of the object, a resonance response caused by the superposition of the characteristic information of each frequency will be generated. The time-domain characteristics of the vibration signal are mainly ...
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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00
CPCG01H17/00
Inventor 严炎崔鹏陈晓清陈华勇
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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