CN115453634A - Overwater combined geophysical prospecting detection scanning device and method for damaged lining of water delivery channel - Google Patents
Overwater combined geophysical prospecting detection scanning device and method for damaged lining of water delivery channel Download PDFInfo
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Abstract
The invention relates to a water combined geophysical prospecting detection scanning device and method for damaged lining of a water delivery channel, which comprises an electrical method instrument connected to the top of a carrying platform, wherein the electrical method instrument is connected with one end of a cable, an electrode of the cable is connected with an air bag and can float on the water surface, and the other end of the cable is connected to a floating platform through a rope; the top of the floating platform is connected with a ground penetrating radar; the electrical method instrument and the ground penetrating radar are respectively connected with the computer. The method has the advantages that two water geophysical prospecting devices are used for synchronous detection, lining structure information can be obtained, underwater resistivity data information can be collected, two kinds of data information are integrated, and the damaged position and the influence of the channel lining can be analyzed more comprehensively.
Description
Technical Field
The invention relates to the technical field of hydraulic engineering detection, in particular to a water combined geophysical prospecting detection scanning device and method for detecting damaged lining of a water delivery channel.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The water delivery channel as one of hydraulic engineering usually has the problems of incomplete investigation work, gradual damage and aging of a matched anti-seepage system and the like, and is particularly characterized in that the phenomena of cracks, top bulges, cavities and the like occur inside a lining structure, so that the channel has the later effect of leakage and water quality deterioration caused by water body exchange, and the detection of the water delivery channel is very necessary. The detection work of the damage of the lining of the water delivery channel has certain complexity and risk, if the water delivery channel is emptied to carry out comprehensive lining damage detection, the working state of the water delivery channel needs to be stopped, the workload is large, and in addition, the high raising pressure under the action of underground water possibly exists at the periphery of the channel, the project can be endangered. How to detect the quality of engineering damage in a hidden state is always a bottleneck problem which is difficult to break through in engineering quality inspection work.
Aiming at the problems, the traditional water delivery channel lining breakage detection device has the following defects:
1. the ground geophysical prospecting detection device has lower detection efficiency and economic benefit due to longer distance of the water delivery channel, and is difficult to meet the detection work requirement of the whole lining damage of the long-distance water delivery main channel;
2. single geophysical prospecting detection device on water, instrument limitation itself is great, can only acquire a data information when using alone, is difficult to obtain channel lining structure information and channel quality of water information simultaneously, and the influence that can't be comprehensive to channel damage degree and cause is analyzed.
Disclosure of Invention
In order to solve the technical problems existing in the background technology, the invention provides a water combined geophysical prospecting detection scanning device and a water combined geophysical prospecting detection scanning method for detecting the damaged lining of a water delivery channel.
In order to achieve the purpose, the invention adopts the following technical scheme:
a first aspect of the present invention provides an above-water combination detecting and scanning apparatus for detecting a broken lining of a water conveyance canal, comprising:
the electric method instrument is connected to the top of the carrying platform, connected with one end of the cable, connected with the airbag and capable of floating on the water surface, and connected to the floating platform through a rope at the other end of the cable; the top of the floating platform is connected with a ground penetrating radar; the electrical method instrument and the ground penetrating radar are respectively connected with the computer.
The carrying platform and the floating platform are both provided with positioning modules, and the positioning modules are both connected with a computer.
The lateral part of the carrying platform is respectively provided with a temperature sensor, an echo sounding device and a conductivity sensor which are connected with a computer, and the echo sounding device is connected with a positioning module.
The electrical method instrument and the ground penetrating radar are both wrapped on the carrying platform and the floating platform through glass fiber cloth.
The electrical method instrument is provided with a power supply interface, a measuring electrode interface and a power supply electrode power supply interface, and the back of the electrical method instrument is provided with an interface connected with a computer.
The ground penetrating radar has an antenna and an interface connected with a computer.
The bottom of carrying platform is equipped with the portable power source storehouse, separates mutually through the deck with carrying platform, and the portable power source storehouse has portable power source, connects through power source interface and electrical method appearance and the ground penetrating radar that cable and portable power source have and realizes the power supply.
The air bag is connected to the peripheral side of the cable and is provided with a plurality of groups of strip-shaped air bag bodies which are arranged in parallel, the plurality of groups of strip-shaped air bag bodies surround the peripheral side of the cable and are connected through matched snap fasteners to form a complete air bag.
The second aspect of the invention provides a water combined geophysical prospecting detection scanning method for realizing the damage of a lining of a water delivery channel based on the device, which comprises the following steps:
the method comprises the following steps that (1) the water ground penetrating radar transmits high-frequency electromagnetic waves to a water body, and a channel image is formed by the reflected electromagnetic waves;
the overwater high-density electrical method instrument applies an electric field to the underwater, and the electric field is influenced by an underground medium to generate spatial change and characteristic response so as to obtain a resistivity distribution image in the same detection area with the overwater ground penetrating radar;
and obtaining channel damage information and resistivity difference and characteristics of media in the stratum according to the channel image and the resistivity distribution image obtained in the same retrieval area, and performing superposition processing to obtain the matching condition of the channel bottom damage position and the leakage position.
Compared with the prior art, the above one or more technical schemes have the following beneficial effects:
1. utilize both jointly to form detection scanning device of high density electrical method on water and ground penetrating radar on water, carry out the scanning of signal of telecommunication and electromagnetic signal respectively and survey, be applicable to the damaged detection scanning of long distance water delivery channel lining cutting, not only can avoid the huge work load that ground geophysical prospecting detected, can also carry out quality of water data information collection, improvement work efficiency when detecting channel lining cutting is damaged
2. In the device working process, adopt two kinds of different geophysical prospecting devices of high density electrical method on water and ground penetrating radar on water simultaneously, carry out the scanning detection of signal of telecommunication and electromagnetic signal respectively, can improve the measurement of geophysical prospecting on water efficiency of efficiency and accuracy.
3. The snap fasteners on the periphery of the air bag enable the air bag to be used in a combined mode so as to adjust the inner diameter and the length of the air bag and control the distance between the electrodes; the volume of the air bag can be controlled by changing the inflation quantity of the air bag, the relative position of the cable in water is adjusted, and the free conversion of different electrode installation types of the cable which floats on the water surface, suspends in the water and sinks to the water bottom for detection and scanning is realized.
4. The two geophysical prospecting methods are used in combination, on one hand, the damage degree of the channel is judged according to the leakage condition, and on the other hand, the reason that the local results of the two detection methods are inconsistent is analyzed through superposition and comparison (for example, the result of the ground penetrating radar shows that damage exists, but the high-density electrical method does not detect resistivity abnormality at the same position, which indicates that damage may occur but the influence is not caused). Besides, the accuracy of the two methods can be evaluated through superposition and comparison of data results, multiple detection and interpretation are needed when the result difference is large, and manual errors are reduced. Through the cooperation of the two geophysical prospecting methods, the safety evaluation of the running condition of the channel can be carried out more comprehensively.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are included to explain the illustrative embodiments of the invention and the description of the invention and are not intended to limit the invention unduly.
FIG. 1 is a schematic diagram of an overall structure of an aquatic combination geophysical prospecting detection scanning device according to one or more embodiments of the present invention;
fig. 2 is a schematic structural diagram of an electrical method in an aquatic complex detection and scanning device according to one or more embodiments of the present invention;
fig. 3 is a schematic structural diagram of a ground penetrating radar in a combined geophysical prospecting detection scanning device provided by one or more embodiments of the invention;
fig. 4 is a schematic structural diagram of a mobile power supply in an aquatic combination geophysical prospecting detection scanning device provided by one or more embodiments of the invention;
FIG. 5 is a schematic diagram of a cable-wrapped bladder of an aquatic combination geophysical prospecting scanning device according to one or more embodiments of the present invention;
in the figure: 1. the device comprises an equipment carrying platform, a 2 GPS positioning system, a 3 temperature sensor, a 4 echo sounding device, a 5 conductivity sensor, a 6 electrical method instrument, a 7 cable, an 8 air bag, a 9 ground penetrating radar, a 10 floating platform, a 11 electrical method instrument power interface, a 12 measuring electrode interface, a 13 power supply electrode power interface, a 14 electrical method instrument and computer connecting interface, a 15 electrical method instrument back, a 16 ground penetrating radar and computer connecting interface, 17 glass fiber cloth, 18 ground penetrating radar antenna, 19 mobile power supply, 20 power interface, 21 mobile power supply bin, 22 air bag length adjusting female buckle, 23 air bag length adjusting male buckle, 24 air bag inner diameter adjusting female buckle and 25 air bag inner diameter adjusting male buckle.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the features, steps, operations, devices, components, and/or combinations thereof.
As described in the background art, in the conventional water delivery channel lining damage detection device, the ground geophysical prospecting detection device has low detection efficiency and economic benefit due to the long distance of the water delivery channel, and is difficult to meet the detection work requirement of the whole lining damage of the long-distance water delivery main canal; the water geophysical prospecting detection device has large self limitation, and a single water geophysical prospecting detection device is difficult to simultaneously obtain channel lining structure information and channel water quality information, so that the damage degree of a channel cannot be comprehensively analyzed. .
Therefore, the following embodiment provides a water combined geophysical prospecting detection scanning device and method for damaged lining of a water delivery channel, wherein an electrical method instrument and a water ground penetrating radar related to a water high-density electrical method are used in a combined mode, and a dragging cable with an air bag and capable of floating on the water surface is matched, so that the huge workload of ground geophysical prospecting detection can be avoided, the uncertainty of a water single geophysical prospecting result can be reduced, and the working efficiency is improved.
The first embodiment is as follows:
as shown in fig. 1 to 5, the above-water united geophysical prospecting detecting and scanning device for detecting the breakage of the lining of the water conveyance canal comprises:
the electric method instrument 6 is connected to the top of the carrying platform 1 and is connected with one end of a cable 7, an electrode of the cable 7 is connected with the air bag 6 and can float on the water surface, and the other end of the cable 7 is connected to the floating platform 10 through a rope; the top of the floating platform 10 is connected with a ground penetrating radar 9; the electric method instrument and the ground detecting radar are respectively connected with the computer.
The carrying platform 1 and the floating platform 10 are both provided with positioning modules, and the positioning modules are both connected with a computer, and the positioning module in the embodiment can be a GPS positioning system 2.
The lateral part of the carrying platform 1 is respectively provided with a temperature sensor 3, an echo depth sounding device 4 and a conductivity sensor 5 which are connected with a computer, and the echo depth sounding device 4 is connected with a positioning module.
The electrical method instrument 6 and the ground penetrating radar 9 are wrapped on the carrying platform 1 and the floating platform 10 through glass fiber cloth 17.
The electrical method instrument 6 is provided with a power supply interface 11, a measuring electrode interface 12 and a power supply electrode power supply interface 1, and the back 15 of the electrical method instrument is provided with an interface 14 connected with a computer.
The ground penetrating radar 9 has an antenna 18 and an interface 16 to a computer.
The bottom of the carrying platform 1 is provided with a mobile power supply bin 21 which is separated from the carrying platform 1 through a deck, the mobile power supply bin 21 is provided with a mobile power supply 19, and the power supply bin is connected with a power interface 20 of the mobile power supply 19, the electric law instrument 6 and the ground penetrating radar 9 through a cable 7 to realize power supply.
The air bag 8 is connected to the peripheral side of the cable 7 and is provided with a plurality of groups of strip-shaped air bag bodies which are arranged in parallel, the strip-shaped air bag bodies surround the peripheral side of the cable 7 and are connected through matched snap fasteners to form the complete air bag 8.
In this embodiment, the snap fasteners may be an air bag length adjusting female fastener 22 and an air bag length adjusting male fastener 23 which are arranged at the two ends of the strip-shaped air bag body and are matched with each other, and an air bag inner diameter adjusting female fastener 24 and an air bag inner diameter adjusting male fastener 25 which are arranged at the two sides of the strip-shaped air bag body and are matched with each other;
in this embodiment, when the cable 7 is arranged along the axial direction of the strip-shaped air bag, the air bag inner diameter adjusting female buckle 24 and the air bag inner diameter adjusting male buckle 25 are connected to fix the cable 7;
in this embodiment, when the cable 7 is arranged along the direction perpendicular to the axis direction of the strip-shaped airbag, the airbag length adjusting female buckle 22 and the airbag length adjusting male buckle 23 are connected to fix the cable;
the inner diameters of the cables 7 which can be handled by the two arrangement modes are different, the lengths of the corresponding air bags covered on the cables are different, and the air bags can be selected according to the diameter of the cables and the distance requirement of electrodes in practical application.
In the embodiment, the carrying platform is a rubber boat, the electric method instrument is placed in the carrying platform for fixing, one end of the measuring cable is connected to the electric method instrument, the electrode part floats on the water surface, and the other end of the measuring cable is connected to a floating platform for carrying the water ground penetrating radar through a rope; the echo sounding device, the temperature sensor and the conductivity sensor are fixed on one side of a carrying platform of the electrical method instrument, and the two GPS positioning systems are respectively arranged on the carrying platform and the floating platform; the ground penetrating radar is wrapped by the glass fiber cloth, so that a waterproof effect can be achieved, and interference caused by electromagnetic signals transmitted by the ground penetrating radar can be reduced to the maximum extent; the air bags wrapped around the measuring cable are connected and combined through snap fasteners to control the electrode distance of the cable, and the relative positions of the cable in the water (floating on the water surface, floating in the water and sinking into the water bottom) are controlled by adjusting the inflating amount of the air bags.
The present embodiment is further described with reference to fig. 1-5:
as shown in fig. 1 to 5, an electrical method instrument 5, a GPS positioning system 2, an echo sounding device 4, a temperature sensor 3 (HOBO), and a conductivity sensor 5 (HOBO) are installed on an equipment-carrying platform 1; the mobile power supply bin 21 is arranged at the bottom of the equipment carrying platform 1 and is separated from the ship surface through a deck; connecting the electrical method instrument 5 with a cable 7, wherein the cable 7 is wrapped with an air bag 8 to ensure that the cable 7 floats on the water surface; the tail end of the cable 7 is connected with a floating platform 10 through a rope, and the ground penetrating radar 9 and the GPS positioning system 2 are installed on the floating platform 10.
The echo sounding device 4, the temperature sensor 3 and the conductivity sensor 5 are fixed on one side of the equipment carrying platform 1, wherein the echo sounding device 4 is connected with the GPS positioning system 2 and is used for observing detected water depth data.
After the equipment is completely placed, assembling and connecting of the instrument are carried out. Connecting a power line to a mobile power supply 19, connecting the other end of the power line to an electric law instrument 5 and a GPS (global positioning system) positioning system 2 respectively, and wrapping the electric law instrument 5 by using glass fiber cloth 17 (EWR 200-100) to play a waterproof role; the connecting line of the cable 7 is sequentially connected to the measuring electrode interface 12 of the electrical method instrument, and the power supply electrode interface 11 of the electrical method instrument is connected with the mobile power supply 19; the electrical method instrument and computer connection interface 14 on the back 15 of the electrical method instrument is connected with a computer, so that the electrical method instrument 5 is connected with the computer.
Ground penetrating radar antenna 18 installation portable power source 19 uses, is connected ground penetrating radar antenna through ground penetrating radar and computer interface 16 and computer link, and the radar wraps up with glass fiber cloth 17 with the region of water contact, when playing waterproof abrasionproof and decrease the effect, and the at utmost reduces the interference to radar signal. In the measuring process, the water ground penetrating radar device and the water high-density electrical method device are simultaneously detected, so that the measuring time can be shortened, and the working efficiency is improved.
The mobile power supply bin 21 is arranged at the bottom of the equipment carrying platform 1 and is separated from the equipment carrying device 1 through a deck, the mobile power supply bin 21 comprises a mobile power supply 19 used for supplying power to an instrument, and the mobile power supply 19 is connected with the instrument in the bin through a power supply interface 20.
The cable 7 realizes the purpose of floating on the surface of water through outside parcel gasbag 8, gasbag 8 uses light slim plastics as the host material, the gassing after the use, be convenient for store, gasbag 8 is provided with the snap-fastener all around, make the gasbag can make up the use, so that adjust the internal diameter and the length of gasbag, a demand for realizing different electrode spacing, gasbag 8's inflation volume is adjustable, change the relative position of cable 7 in aqueous, realize that the cable floats on the surface of water, the suspension is in aqueous, and sink into the submarine different electrode installation pattern that detect the scanning freely change.
Each device in the device is provided with a waterproof protection measure. The waterproof cable is used, so that damage to the electrode is avoided, the radar and the electrical method instrument are protected from water and abrasion, the radar and the electrical method instrument are wrapped by the glass fiber cloth, and interference to the electric signal transmitted by the equipment is reduced to the greatest extent on the premise that the equipment is protected from being damaged for a long time.
The device is matched with a GPS, an echo sounding system, a temperature sensor and a conductivity sensor, can synchronously acquire position, water depth, temperature and conductivity data, can better interpret data of an underwater high-density electrical method and an underwater ground penetrating radar, and improves the working efficiency.
The device is detachable structure, and the installation is convenient, and it is convenient to remove, is applicable to the damaged detection scanning of water main canal lining under the different conditions (including plain area and mountain area, plateau etc.), and in the device working process, adopt the two kinds of different geophysical prospecting devices of aquatic high density electrical method and ground penetrating radar simultaneously, carry out the scanning detection of signal of telecommunication and electromagnetic signal respectively, improved the measurement of aquatic geophysical prospecting efficiency and accuracy.
Example two:
the embodiment provides a method for realizing above-water combined geophysical prospecting detection scanning aiming at damaged lining of a water delivery channel by using the device based on the first embodiment, which comprises the following steps:
the overwater high-density electrical method instrument and the overwater ground penetrating radar work synchronously to ensure that the detection routes in the long-distance channel are consistent in height;
the method comprises the steps that an overwater ground penetrating radar transmits electromagnetic signals to a channel to obtain structural information of the whole lining of the channel, and the damaged position of the lining is detected;
the overwater high-density electrical method instrument emits electrical signals underwater to acquire underwater resistivity data information for analyzing the resistivity change situation of a leakage position, and is assisted with better analysis of the whole situation of a main channel by water depth information, resistivity information, temperature information and position information measured by a sonar, a sensor and a GP S.
Channel lining structure data that ground penetrating radar surveyed on water matches the seepage position resistivity data information that the high density electrical method surveyed on water, when ruling the damaged position of channel this position resistivity change condition of analysis, not only can improve work efficiency, can also carry out the analysis to the secondary hazard that the channel damage caused to carry out later maintenance work.
Specifically, the method comprises the following steps:
the method comprises the following steps that the water ground penetrating radar transmits high-frequency electromagnetic waves to the underground in a directional pulse mode through a transmitting antenna, and visible channel images are generated by utilizing the reflected electromagnetic waves to obtain channel damage information conditions;
the overwater high-density electrical method instrument applies an electric field to the underwater, detects and contrasts the resistivity difference and the characteristics of the medium in the stratum according to the space change and the characteristic response of the artificial electric field influenced by the underground medium, obtains a resistivity distribution image of a detection area, and further deduces the underground medium.
Because the detection routes are consistent, when data interpretation is carried out, the water depth information detected by the ground penetrating radar can be used for data inversion of the high-density electrical method instrument on water, the data interpretation results obtained by the two geophysical prospecting methods are overlapped, the same positions and the different positions of the abnormal data results detected by the two geophysical prospecting methods are compared, and the matching condition of the damaged position and the leakage position of the channel bottom can be visually obtained.
The high-density resistivity method can detect resistivity information of different depths of the bottom of the channel, and the ground penetrating radar can detect structural damage information of different depths of the channel. Each layer is taken as a research object, and the resistivity information and the structure information on the two-dimensional surface are combined to obtain the formation condition of a certain depth of the bottom of the channel. By researching the channel bottom composition of a plurality of two-dimensional sections, the leakage passage and the leakage amount of the channel are deduced, and a three-dimensional leakage model is constructed.
During data processing, channel bottom information such as water depth, terrain, structure and the like detected by the ground penetrating radar is applied to data interpretation of the high-density electrical method as prior information and is reflected in a visualization result of the high-density electrical method. When the ground penetrating radar is used for detection, two different channel bottom media can not be accurately distinguished due to the fact that the dielectric constants of the two different channel bottom media are close to each other, and at the moment, the resistivity data detected by a high-density electrical method is needed to help to interpret and distinguish different geological information, so that more accurate channel structure distribution is obtained. Two-dimensional sections with different depths are selected according to topographic conditions, the structure and resistivity distribution of the two-dimensional sections are analyzed, more comprehensive section information is obtained, channel bottom composition of a plurality of two-dimensional sections is researched, further, leakage channels and leakage amount of channels are calculated, and finally, a three-dimensional channel leakage model is constructed.
On one hand, the degree of channel damage is judged according to the leakage condition, and on the other hand, the reason that the local results of the two detection methods are inconsistent is analyzed through superposition comparison (for example, the ground penetrating radar result shows that damage exists, but under the same position, the high-density electrical method does not detect resistivity abnormality, which indicates that damage may occur but no influence is caused). In addition, the accuracy of the two methods can be judged through superposition comparison of data results, and when the result difference is large, multiple detection interpretation is needed, so that manual errors are reduced. Through the cooperation of the two geophysical prospecting methods, the safety evaluation can be performed on the operation condition of the channel more comprehensively.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The damaged aquatic combined geophysical prospecting of water delivery channel lining detects scanning device, its characterized in that: the method comprises the following steps: the electric method instrument is connected to the top of the carrying platform, the electric method instrument is connected with one end of the cable, an electrode of the cable is connected with the air bag and can float on the water surface, and the other end of the cable is connected to the floating platform through a rope; the top of the floating platform is connected with a ground penetrating radar; the electrical method instrument and the ground penetrating radar are respectively connected with the computer.
2. The water delivery canal lining damage above-water united geophysical prospecting detection scanning device of claim 1, characterized in that: the carrying platform and the floating platform are both provided with positioning modules, and the positioning modules are both connected with a computer.
3. The water delivery canal lining damage above-water united geophysical prospecting detection scanning device of claim 1, characterized in that: the lateral part of the carrying platform is respectively provided with a temperature sensor, an echo depth sounding device and a conductivity sensor which are connected with a computer, and the echo depth sounding device is connected with a positioning module.
4. The water delivery canal lining damage above-water united geophysical prospecting detection scanning device of claim 1, characterized in that: the electrical method instrument and the ground penetrating radar are both wrapped on the carrying platform and the floating platform through glass fiber cloth.
5. The water delivery canal lining damage above-water united geophysical prospecting detection scanning device of claim 1, characterized in that: the electrical method instrument is provided with a power supply interface, a measuring electrode interface and a power supply electrode power supply interface, and the back of the electrical method instrument is provided with an interface connected with a computer.
6. The water delivery canal lining damage above-water united geophysical prospecting detection scanning device of claim 1, characterized in that: the ground penetrating radar is provided with an antenna and an interface connected with a computer.
7. The above-water united geophysical prospecting detection and scanning installation for water transport canal lining failure of claim 1, wherein: the bottom of carrying platform is equipped with the portable power source storehouse, separates mutually through the deck with carrying platform, and the portable power source storehouse has portable power source, is connected through power source interface and electric law appearance and ground penetrating radar that cable and portable power source have and realizes the power supply.
8. The above-water united geophysical prospecting detection and scanning installation for water transport canal lining failure of claim 1, wherein: the air bag is connected to the peripheral side face of the cable and is provided with a plurality of groups of strip-shaped air bag bodies which are arranged in parallel, the plurality of groups of strip-shaped air bag bodies surround the peripheral side face of the cable and are connected through matched snap fasteners to form a complete air bag.
9. An above-water united geophysical prospecting detection scanning method for realizing the breakage of a lining of a water delivery channel based on the device of any one of claims 1 to 8 comprises the following steps:
the method comprises the following steps that a water ground penetrating radar emits high-frequency electromagnetic waves to a water body, and a channel image is formed by the reflected electromagnetic waves;
the water high-density electrical method instrument applies an electric field to underwater, and the electric field is influenced by underground media to generate spatial change and characteristic response so as to obtain a resistivity distribution image in the same detection area with the water ground penetrating radar;
and according to the channel image and the resistivity distribution image obtained in the same retrieval area, obtaining channel damage information and resistivity difference and characteristics of media in the stratum, and performing superposition processing to obtain the matching condition of the channel bottom damage position and the leakage position.
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