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Estuary suspended sediment concentration real-time measuring method based on sound attenuation

A real-time measurement and sound attenuation technology, which is applied in the field of ocean observation and ocean suspended sediment measurement, can solve the problems of information missing time continuity, viscous absorption, sound wave energy attenuation, etc., to improve detection accuracy and detection range, and improve information amount, the effect of improving accuracy

Active Publication Date: 2019-05-10
XIAMEN UNIV
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AI Technical Summary

Problems solved by technology

To address this shortcoming, the method of towing a ship is usually used to obtain large-scale data in the horizontal direction, but the information lacks time continuity
There is also a method of origin collection designed, that is, put the device into the water, collect the concentration data regularly and store it, take it out after a few days, and read the data. Although this method has continuity in time, the collection is only at a fixed point in space. data
[0005] On the other hand, when the sound wave propagates in the suspension, the particles and the fluid move relative to each other, and viscous absorption and scattering occur, resulting in the energy attenuation of the sound wave in the direction of propagation.

Method used

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  • Estuary suspended sediment concentration real-time measuring method based on sound attenuation
  • Estuary suspended sediment concentration real-time measuring method based on sound attenuation
  • Estuary suspended sediment concentration real-time measuring method based on sound attenuation

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Embodiment

[0055] This embodiment provides a real-time observation method of suspended sediment concentration in the sea estuary based on sound attenuation, such as figure 1 As shown, the specific steps are as follows:

[0056] Step 1: Arrange the underwater signal transmitter and receiver at the sea estuary;

[0057] The underwater transducer and the receiving array are arranged at a distance of 1000m from the detection area, which are the sending end and the receiving end, respectively. The narrowband signals of multiple frequencies are sent at the transmitting end, and the array element at the receiving end receives the detection signal. The detection signals sent are narrow-band signals of different frequencies, and the frequency range is from 50KHz to 500KHz.

[0058] Step 2: Send and receive acoustic detection signals, based on passive time reversal technology, eliminate the multipath effect of the underwater channel, and calculate the acoustic attenuation;

[0059] The passive ...

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Abstract

The invention discloses an estuary suspended sediment concentration real-time measuring method based on sound attenuation. The estuary suspended sediment concentration real-time measuring method basedon the sound attenuation comprises the steps that an underwater sound signal sending end and a receiving end are arranged in an estuary, sound attenuation is calculated, acoustic attenuation disturbance caused by suspended sediment is calculated, and the suspended sediment concentration is iteratively calculated. According to the estuary suspended sediment concentration real-time measuring methodbased on the sound attenuation, covering areas are wide, the expandability is high, obtained parameters are more continuous in space, the detecting instantaneity is good, and the measuring precisionis high. Sound propagation technology is adopted for measuring, and the performance is better and development and application potentiality are more achieved compared with light, electromagnetic wave and other modes.

Description

technical field [0001] The invention relates to the technical field of ocean observation, in particular to the technical field of marine suspended sediment measurement, and more particularly to a method for real-time measurement of suspended sediment concentration in sea estuaries based on sound attenuation. Background technique [0002] Now in the mouths of rivers and rivers, a large amount of suspended sediment is transported into the sea, making the sea water in the nearby sea turbid. The size and change of sediment transport volume play an important role in the changes and development of water quality and underwater topography, and also affect the changes in the ecosystem in seawater, and at the same time affect the use and construction of coastal areas by humans. Under the action of tides and water body flow, sediments are constantly floating, migrating, and settling, which has a great impact on ports, water conservancy, and river and coast projects. The migration proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/06
Inventor 程恩涂强袁飞朱逸高春仙
Owner XIAMEN UNIV
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