CN109342569B - Method for monitoring stability of silt submarine channel slope in real time - Google Patents
Method for monitoring stability of silt submarine channel slope in real time Download PDFInfo
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Abstract
The invention discloses a method for monitoring stability of a silt submarine channel side slope in real time, which comprises the steps of arranging buoys at the edges of a channel, mounting an acoustic profile detection system on the buoys, transmitting sound waves to the seabed by the acoustic profile detection system to penetrate through a submarine channel side slope settled layer, receiving the seabed sound waves by a receiving system, converting the seabed sound waves into a sedimentary profile acoustic image, transmitting a sedimentary acoustic image signal to a monitoring center by a transmission system, and monitoring and analyzing the stability of the channel side slope in real time after the monitoring center processes the transmitted acoustic image. The method for monitoring the stability of the muddy submarine channel side slope in real time does not affect the normal operation of the ship and realizes all-weather real-time monitoring.
Description
Technical Field
The invention belongs to the technical field of ocean monitoring, and relates to a method for monitoring the stability of a silt submarine channel side slope in real time.
Background
The silt submarine channel instability slumping is a natural adjustment process for obtaining a stable state by manually excavating a channel slope, and even if the slope is very slow, the channel can also generate instability slumping when the slope angle is less than 1 degree, the geometric shape of the channel is changed, a port is blocked, and great economic and social losses are caused. According to the motion mechanism, the deformation degree and the motion state of a common water-saturated soil body, the slope soil body instability and collapse can be divided into three types of creep, sliding and flowing. Creep refers to the fact that the slope is slowly, continuously and irreversibly deformed for a long time under the action of a certain external force, but obvious displacement does not occur on the whole, and the creep is the prelude that the slope of the submarine channel is prone to damage. The slip means that the unstable soil body does block motion on the seabed slope. The flowing means that unstable soil body is completely disintegrated to form fluid to move on the seabed slope.
Due to the fact that the muddy sea area seawater has good conductivity, extremely strong heat absorption capacity and extremely poor light transmittance, the radar, the infrared telescope, the satellite remote sensing technology and the like are stranded by the detection technology of laser and electromagnetic wave transmission, the seabed sediment layer cannot be detected efficiently, meanwhile, due to the fact that people are difficult to approach the seabed, especially under the severe sea condition, an effective method is always lacked for monitoring the muddy seabed channel unstable collapse, and most of the muddy seabed channel unstable collapse situation can be checked later by means of a depth measuring method or a multi-wave speed scanning method.
The principle of the method is that an acoustic transducer is utilized to emit acoustic waves to the seabed, after acoustic pulses pass through seawater and touch the seabed, part of the acoustic energy is reflected and returned to the transducer, the other part of the acoustic energy continues to propagate to the deep position of a settled layer, and echoes are continuously returned until the energy loss of the acoustic waves is exhausted, the change of internal tissues of the settled layer has certain influence on the propagation of the acoustic waves, when factors such as the composition, the structure and the density of the settled layer change, the propagation speed, the energy attenuation, the frequency spectrum component and the like of the acoustic waves also change correspondingly, and the performance and the structural change of the settled layer can be known by observing, recording and analyzing different reactions of the settled layer on the seabed to the acoustic waves. The sound velocity of the same submarine sediment at different strain stages has the obvious characteristic of changing along with stress, and the channel sediment has different physical properties and different responses to the sound velocity in different development periods of instability and collapse, so that the monitoring of the stability of the submarine channel side slope by using an acoustic method is possible.
At present, monitoring and analysis of the stability of a submarine channel slope are mainly divided into a direct method and an indirect method. The direct method is to analyze the physical properties of the channel side slope sediment in a laboratory, but the silt submarine channel sediment has high water content, the channel side slope sediment sample is very difficult to be adopted, the original state of the sediment is inevitably damaged during sampling, and the analysis on the stability of the side slope is difficult to realize dynamically in real time even if field measurement is laborious and time-consuming. The indirect method is to use a survey vessel to install a detection system such as a shallow stratum profile to detect the channel, analyze the stability of the channel slope according to the acoustic image, and realize continuous monitoring, the survey vessel needs to repeatedly detect the channel, so that the normal operation of the channel is influenced, and the outbound detection is limited under severe environments such as special weather, particularly heavy storms and the like.
Disclosure of Invention
The invention provides a method for monitoring the stability of a silt submarine channel side slope in real time based on the defects of monitoring and analyzing the stability of the submarine channel side slope by the conventional method.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for monitoring the stability of a slope of a muddy submarine channel in real time is characterized by comprising the following steps:
a. selecting a channel side slope and arranging fixed-point buoys;
b. an acoustic profile detection system is arranged on the buoy;
c. the method comprises the following steps that an acoustic profile detection system detects a submarine channel side slope deposition layer in real time and obtains an acoustic map of the submarine channel side slope deposition layer;
d. transmitting the acoustic map to a monitoring center in real time through a wireless transmission system;
e. and after the monitoring center processes the acoustic map, monitoring the stable state of the channel slope in real time.
Further, the method comprises a buoy system, a channel slope acoustic detection system, an acoustic image transmission system, a monitoring system and an image processing system.
Furthermore, the buoy system comprises a fixing system, a GPS (global positioning system), a solar power supply system, an anti-collision system and a light warning system.
Furthermore, the channel side slope detection system adopts a parametric array narrow-wave shallow stratum profile system, comprises a host, a transducer and a motion sensor, and is used for detecting channel sedimentary layer information and acquiring a channel sonogram image, wherein the sonogram can adopt a gray scale mode.
Furthermore, the acoustic image transmission system is used for transmitting acoustic image information to the image processing system of the monitoring center, and coastal wireless transmission, mobile phones and iridium satellites can be adopted.
Further, the image processing system processes the received depositional acoustic atlas, including image registration, graying processing, and voiceprint thresholding.
Furthermore, the solar power supply system comprises a solar cell panel, a storage battery, a solar controller and an inverter, wherein the solar cell panel is arranged on the outer side of the floating body and located in 4 directions, and the solar cell panel absorbs solar energy in all directions and converts the solar energy into electric energy.
Furthermore, the fixing system comprises a floating body, a tail pipe, an instrument frame, a support and anchor equipment, wherein the support is provided with a sensor and an antenna, and the support comprises a satellite communication machine, a VHF radio station antenna, a GPRS antenna and a GPS antenna.
Further, the specific method of the image processing system comprises the steps of carrying out gray processing on the channel deposition acoustic image, selecting one channel deposition acoustic image as a background image, subtracting the background image from the subsequent sequence image, analyzing the change characteristics and the change rate of the subtracted images, and monitoring the stable state of the channel slope in real time.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the continuous, efficient and real-time detection of the stability of the silt submarine channel side slope is realized through the buoy system, the channel side slope acoustic detection system, the acoustic image transmission system and the monitoring system, the normal operation of a channel ship is not influenced, the difficulty that the conventional manual investigation is difficult to accurately monitor is realized, especially the stability of the submarine channel side slope can be monitored in real time under severe weather such as storm surge, heavy storm and the like, and all-weather real-time monitoring is realized.
The method has the greatest innovation point that the fixed-point buoy system is connected with a channel side slope acoustic detection system, an acoustic image transmission system and a monitoring system, and the deformation of the internal structure of the sediment of the submarine channel side slope is judged in advance according to the change of the sediment acoustic map by acquiring all-weather channel side slope sediment acoustic maps, so that the stability of the muddy submarine channel side slope is detected in real time.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples:
as shown in fig. 1, a method for monitoring the slope stability of a muddy submarine channel in real time is characterized by comprising the following steps:
a. selecting a channel side slope and arranging fixed-point buoys;
b. an acoustic profile detection system is arranged on the buoy;
c. the method comprises the following steps that an acoustic profile detection system detects a submarine channel side slope deposition layer in real time and obtains an acoustic map of the submarine channel side slope deposition layer;
d. transmitting the acoustic map to a monitoring center in real time through a wireless transmission system;
e. and after the monitoring center processes the acoustic map, monitoring the stable state of the channel slope in real time.
Further, the method comprises a buoy system, a channel slope acoustic detection system, an acoustic image transmission system, a monitoring system and an image processing system.
Furthermore, the buoy system comprises a fixing system, a GPS (global positioning system), a solar power supply system, an anti-collision system and a light warning system.
Furthermore, the channel side slope detection system adopts a parametric array narrow-wave shallow stratum profile system, comprises a host, a transducer and a motion sensor, and is used for detecting channel sedimentary layer information and acquiring a channel sonogram image, wherein the sonogram can adopt a gray scale mode.
Furthermore, the acoustic image transmission system is used for transmitting acoustic image information to the image processing system of the monitoring center, and coastal wireless transmission, mobile phones and iridium satellites can be adopted.
Further, the image processing system processes the received depositional acoustic atlas, including image registration, graying processing, and voiceprint thresholding.
Furthermore, the solar power supply system comprises a solar cell panel, a storage battery, a solar controller and an inverter, wherein the solar cell panel is arranged on the outer side of the floating body and located in 4 directions, and the solar cell panel absorbs solar energy in all directions and converts the solar energy into electric energy.
Furthermore, the fixing system comprises a floating body, a tail pipe, an instrument frame, a support and anchor equipment, wherein the support is provided with a sensor and an antenna, and the support comprises a satellite communication machine, a VHF radio station antenna, a GPRS antenna and a GPS antenna.
Further, the specific method of the image processing system comprises the steps of carrying out gray processing on the channel deposition acoustic image, selecting one channel deposition acoustic image as a background image, subtracting the background image from the subsequent sequence image, analyzing the change characteristics and the change rate of the subtracted images, and monitoring the stable state of the channel slope in real time.
Example (b):
a. and arranging fixed-point buoys according to the situations of the sedimentary layer and the slope angle of the side slope of the navigation channel. The buoy system comprises a floating body, a tail pipe, a GPS positioning system, a remote transmission instrument, a solar power supply system, an anti-collision system, a light warning system, an instrument frame, a support and anchorage equipment, wherein the solar power supply system comprises a solar cell panel, a storage battery pack, a solar controller and an inverter, the solar cell panel is arranged on the outer side of the floating body and located in 4 directions, and solar energy is absorbed in all directions and converted into electric energy. The bracket is provided with a sensor and an antenna, and comprises a satellite communication machine, a VHF radio station antenna, a GPRS antenna and a GPS antenna.
b. And a parametric array narrow-wave shallow stratum profile system is arranged on the buoy. The shallow profile system includes a host, a transducer, and a motion sensor.
c. A parametric array narrow-wave shallow stratum profile system detects a channel slope sedimentary deposit in real time, a parametric array transducer simultaneously transmits two high-frequency sound wave signals (f1, f2) with close frequencies to the water bottom under high pressure as main frequencies, when sound waves propagate in a water medium, difference frequency waves are formed due to nonlinear effects, such as sound wave signals f1, f2, (f1+ f2), (f1-f2), 2f1, 2f2 and the like, and because the frequencies of f1 and f2 are very close, the frequency of the difference frequency (f1-f2) is very low, the difference frequency sound wave signals have very strong sedimentary deposit penetrating power, the beam angle of the difference frequency sound wave signals at high frequency is very close, side lobes are avoided, the beam directivity is good, high resolution is achieved, and the sedimentary deposit acoustic map can be conveniently identified and obtained.
d. The sedimentary acoustic atlas is transmitted to the monitoring center in real time through a transmission system, and the transmission system can adopt coastal wireless transmission, a mobile phone or an iridium satellite.
e. The monitoring center is provided with a receiving system and an image processing system, and the image processing system processes the received sedimentary acoustic atlas, including image registration, gray processing and voiceprint threshold. The method specifically comprises the steps of carrying out gray processing on a channel deposition acoustic image, selecting one channel deposition acoustic image as a background image, subtracting the background image from a subsequent sequence image, analyzing the change characteristics and the change rate of each subtracted image, and monitoring the stable state of a channel slope in real time.
The invention provides an all-weather real-time monitoring method for stability of a channel slope, which is realized by combining a fixed-point buoy system, a channel slope acoustic detection system, an acoustic image transmission system and a monitoring system, aiming at the defects that submarine channel sediments are difficult to sample and real-time observation data cannot be continuously obtained by using a survey ship to carry out acoustic detection.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (6)
1. A method for monitoring the stability of a slope of a muddy submarine channel in real time is characterized by comprising the following steps:
a. selecting a channel side slope and arranging fixed-point buoys;
b. an acoustic profile detection system is arranged on the buoy;
c. the method comprises the following steps that an acoustic profile detection system detects a submarine channel side slope deposition layer in real time and obtains an acoustic map of the submarine channel side slope deposition layer;
d. transmitting the acoustic map to a monitoring center in real time through a wireless transmission system;
e. after the monitoring center processes the acoustic map, monitoring the stable state of the channel slope in real time;
the method comprises a buoy system, a channel slope acoustic profile detection system, an acoustic image transmission system, a monitoring system and an image processing system; the image processing system processes the received deposition acoustic atlas, and the processing comprises image registration, gray processing and a voiceprint threshold value; the specific method of the image processing system comprises the steps of carrying out gray processing on the channel sediment acoustic image, selecting one channel acoustic image as a background image, then subtracting the background image from the subsequent sequence image, analyzing the change characteristics and the change rate of the subtracted images, and monitoring the channel slope stable state in real time.
2. The method for monitoring the slope stability of the muddy submarine navigation channel in real time according to claim 1, which is characterized in that: the buoy system comprises a fixing system, a GPS positioning system, a solar power supply system, an anti-collision system and a light warning system.
3. The method for monitoring the slope stability of the muddy submarine navigation channel in real time according to claim 1, which is characterized in that: the channel slope detection system adopts a parametric array narrow-wave shallow stratum profile system, comprises a host, a transducer and a motion sensor, and is used for detecting channel sediment layer information and acquiring a channel sonogram image, wherein the sonogram can adopt a gray scale mode.
4. The method for monitoring the slope stability of the muddy submarine navigation channel in real time according to claim 1, which is characterized in that: the acoustic image transmission system is used for transmitting acoustic image information to the image processing system of the monitoring center, and can adopt coastal wireless transmission, mobile phones and iridium satellites.
5. The method for monitoring the slope stability of the muddy submarine navigation channel in real time according to claim 2, characterized in that: the solar power supply system comprises a solar cell panel, a storage battery pack, a solar controller and an inverter, wherein the solar cell panel is arranged on the outer side of the floating body and positioned in 4 directions, and the solar cell panel absorbs solar energy in all directions and converts the solar energy into electric energy.
6. The method for monitoring the slope stability of the muddy submarine navigation channel in real time according to claim 2, characterized in that: the fixing system comprises a floating body, a tail pipe, an instrument frame, a support and anchor equipment, wherein the support is provided with a sensor and an antenna, and comprises a satellite communication machine, a VHF radio station antenna, a GPRS antenna and a GPS antenna.
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