An underwater structure fluid loss intensity evaluation method based on multi-dimensional acoustic scanning

Abstract

The application discloses a kind of underwater structure fluid loss intensity evaluation methods based on multi-dimension acoustic scanning, belong to underwater engineering detection technical field.The method is by ROV carrying shallow stratigraphic profiler to the underwater structure is bidirectional scanning in transverse and longitudinal direction, obtains acoustic profile data;From data, identify the silt reflection phenomenon caused by structure gap;Based on the phenomenon identified, extract impact height, impact mouth section to water surface length and structure gap width and other parameters;According to the extracted parameters, calculate impact height coefficient, impact section coefficient and impact compression coefficient, realize multi-dimension quantitative evaluation of fluid loss intensity through the coupling calculation of three coefficients.The application can accurately identify siltation and structure deformation in turbidity water area, realize efficient data acquisition while reducing manual risk, improve the reliability and accuracy of evaluation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underwater engineering detection, and particularly relates to a method for evaluating fluid loss intensity of underwater structure based on multi-dimensional acoustic scanning. BACKGROUND

[0002] In the field of underwater structure state monitoring, fluid loss intensity evaluation is crucial for ensuring structure safety. Current main evaluation techniques include non-destructive testing, numerical simulation and specification evaluation system. However, these traditional methods have obvious limitations: non-destructive testing techniques are easily disturbed by environmental factors such as water turbidity and flow rate, and the detection effect significantly decreases under complex structure conditions; numerical simulation methods are costly and heavily dependent on idealized assumptions, making it difficult to accurately reflect actual working conditions; specification evaluation system focuses on static indicators, making it difficult to effectively respond to dynamic scouring or extreme events. In particular, in actual engineering, complex working conditions such as high salt corrosion and multi-factor coupling further reduce the accuracy of existing evaluation methods. Although the two-way scanning cooperation of ROV robots and shallow stratigraphic profilers can collect data in turbidity water, there is still a lack of effective quantitative evaluation means at the data analysis level. The sand reflection phenomenon identified in the imaging results has not been fully utilized, and a complete technical chain from phenomenon identification to intensity evaluation cannot be established. Therefore, there is an urgent need for a new method that can accurately quantify the fluid loss intensity of underwater structures to overcome the shortcomings of existing technologies. SUMMARY

[0003] The purpose of the present application is to provide a method for evaluating the fluid loss intensity of underwater structures based on multi-dimensional acoustic scanning to solve the problems raised in the background art.

[0004] The present application is achieved by the following technical solutions:

[0005] A method for evaluating the fluid loss intensity of underwater structures based on multi-dimensional acoustic scanning, the method comprising the following steps:

[0006] S1. Scanning the underwater structure in both horizontal and vertical directions by mounting a shallow stratigraphic profiler on an ROV to obtain acoustic profile data;

[0007] S2. Based on the horizontal scanning results, calculating the number of lines of points A and B, and taking their average as the basis for the number of lines of vertical scanning;

[0008] S3. Identifying the sand reflection phenomenon at the structure gap from the vertical scanning acoustic profile results;

[0009] S4. Extracting the impact height of sand reflection And the length of the impact port to the water surface ;

[0010] S5, based on , and has a reflective width The impact height coefficient, impact section coefficient, and impact compressibility coefficient are calculated to achieve a multi-dimensional quantitative assessment of fluid loss intensity.

[0011] Furthermore, in step S2, calculating the number of traces at measurement points A and B specifically includes: pre-setting the scanning accuracy width unit according to the on-site working conditions. Each is obtained through the following formulas:

[0012]

[0013]

[0014] Calculate the number of traces and ,in , and , These are the structural edge points identified through acoustic profile results.

[0015] Furthermore, the aforementioned The value is determined by the inherent accuracy and resolution of the sonar scanning equipment used, as well as the current environmental conditions such as turbidity and flow velocity of the water.

[0016] Furthermore, the impact height mentioned in step S4 The determination specifically includes: measuring the depth of the pit formed by the topographic damage caused by sediment reflection in the longitudinal acoustic profile imaging results, and calculating it in combination with the length of the sediment impact trajectory extending to the water surface.

[0017] Furthermore, the length of the impact port to the water surface mentioned in step S4 In a nearshore environment, this is equivalent to the water depth at the location of the impact point.

[0018] Furthermore, the formula for calculating the impact height coefficient in step S5 is as follows:

[0019]

[0020] Where N is the sum of the number of traces between measuring points A and B. This represents the number of traces.

[0021] Furthermore, the formula for calculating the impact section modulus in step S5 is as follows:

[0022]

[0023] Where N is the sum of the number of traces at measuring points A and B.

[0024] Further, the formula for calculating the impact compression coefficient in step S5 is:

[0025]

[0026] Where N is the sum of the number of lines of A and B points.

[0027] Further, the transverse scanning in step S1 includes scanning A points along a first direction and scanning B points along a second direction The longitudinal scanning is a high-precision scanning cut along the direction of the A and B point connection line.

[0028] Further, the three coefficients in step S5 constitute a multi-coefficient coupling calculation model, which evaluates the fluid loss intensity by quantifying the terrain damage and the impact effect of sediment water flow.

[0029] Compared with the prior art, the present application has the following beneficial effects:

[0030] 1. Through the bidirectional scanning and cutting cooperative operation mode and the multi-coefficient coupling calculation method, the environmental disturbances such as water turbidity can be effectively overcome, the accurate identification and quantitative analysis of the sediment reflection phenomenon can be realized, and the reliability and accuracy of the evaluation results are greatly improved.

[0031] 2. The real-time data driven evaluation mode is adopted, the idealization assumption problem in numerical simulation is avoided, the complex actual working conditions such as high salt corrosion and multi-factor coupling can be adapted, and a general solution for state evaluation of different types of underwater structures is provided.

[0032] 3. Through the systematic scanning path planning and parameter extraction process, the data quality is ensured while the field operation time and manual intervention are significantly reduced, the detection cost is reduced, and the economic benefit of engineering monitoring is improved.

[0033] 4. The ROV remote operation replaces the traditional manual diving detection, effectively avoids the safety risk of divers working in complex underwater environment, and provides reliable technical support for structure detection under dangerous working conditions.

[0034] 5. The established multi-dimensional evaluation system can provide quantitative basis for maintenance decision of underwater structures, help to find potential risks in time and take targeted measures, prolong the service life of structures, and ensure the operation safety. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only the preferred embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0036] Figure 1 The overall flow structure schematic diagram of the underwater structure fluid loss strength evaluation method based on multi-dimensional acoustic scanning provided by the present application.

[0037] Figure 2 The lateral scanning schematic diagram of the underwater structure fluid loss strength evaluation method based on multi-dimensional acoustic scanning provided by the present application.

[0038] Figure 3 The underwater structure fluid loss strength evaluation method based on multi-dimensional acoustic scanning provided by the present application The structure simplified schematic diagram of the strike scanning A point.

[0039] Figure 4 The acoustic profile result obtained by the first scanning of the underwater structure fluid loss strength evaluation method based on multi-dimensional acoustic scanning provided by the present application.

[0040] Figure 5 The underwater structure fluid loss strength evaluation method based on multi-dimensional acoustic scanning provided by the present application The structure simplified schematic diagram of the strike scanning B point.

[0041] Figure 6 The longitudinal scanning schematic diagram of the underwater structure fluid loss strength evaluation method based on multi-dimensional acoustic scanning provided by the present application.

[0042] Figure 7 The acoustic profile result obtained by the second scanning of the underwater structure fluid loss strength evaluation method based on multi-dimensional acoustic scanning provided by the present application.

[0043] Figure 8 The sediment reflection schematic diagram of the underwater structure fluid loss strength evaluation method based on multi-dimensional acoustic scanning provided by the present application.

[0044] Figure 9 The impact height position schematic diagram of the underwater structure fluid loss strength evaluation method based on multi-dimensional acoustic scanning provided by the present application.

[0045] Figure 10 The impact port length position schematic diagram of the underwater structure fluid loss strength evaluation method based on multi-dimensional acoustic scanning provided by the present application.

[0046] Figure 11 A sediment reflection part width schematic diagram of a method for evaluating fluid loss intensity of underwater structure based on multi-dimension acoustic scanning provided by the present application. DETAILED DESCRIPTION

[0047] In order to make the objectives, technical solutions and advantages of the present application more obvious, the following will describe the example embodiments according to the present application in detail with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the example embodiments described herein. Based on the embodiments of the present application described in the present application, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present application.

[0048] In the following description, a large number of specific details are given in order to provide a more thorough understanding of the present application. However, it should be apparent to those skilled in the art that the present application can be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the present application.

[0049] It should be understood that the present application can be implemented in different forms and should not be interpreted as being limited to the embodiments presented herein. On the contrary, these embodiments are provided so that the disclosure will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0050] The terms used herein are only for the purpose of describing specific embodiments and not as limitations of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0051] In order to thoroughly understand the present application, detailed structures will be presented in the following description in order to explain the technical solutions proposed by the present application. The alternative embodiments of the present application are described in detail as follows, however, in addition to these detailed descriptions, the present application can also have other implementation manners.

[0052] Referring to Figures 1-11 A method for evaluating fluid loss intensity of underwater structure based on multi-dimension acoustic scanning, the method comprising the following steps:

[0053] S1, by ROV carrying shallow stratigraphic profiler on underwater structure for transverse and longitudinal two-way sweep scanning, to obtain acoustic profile data;

[0054] S2, based on the transverse scanning results, the number of A, B two measuring points are calculated, and the average value is taken as the number of longitudinal scanning;

[0055] S3, from the longitudinal scanning acoustic profile results, the sediment reflection phenomenon at the gap between the structures is identified;

[0056] S4, extract the impact height of the sediment reflection And the length of the impact port to the water surface ;

[0057] S5, based on , And the width of the reflection part , the impact height coefficient, the impact cross section coefficient and the impact compression coefficient are calculated, and the multi-dimensional quantitative evaluation of fluid loss strength is realized.

[0058] In step S2, the calculation of the number of A and B two measuring points specifically includes: according to the field working condition, the scanning accuracy width unit Is preset, respectively through the formula:

[0059]

[0060]

[0061] Calculate the number of lines And , wherein , And , Is the structure edge point identified by acoustic profile results.

[0062] The value of Is determined by the inherent accuracy resolution index of the used sonar scanning equipment and the turbidity, flow rate environmental conditions of the current water area.

[0063] The determination of the impact height In step S4 specifically includes: in the longitudinal acoustic profile imaging results, the pit depth formed by the topographic damage caused by sediment reflection is measured, and the length of the sediment impact trajectory extending to the water surface is combined to calculate.

[0064] The length of the impact port to the water surface In step S4 is equal to the water depth at the impact port position in offshore environment.

[0065] The formula for calculating the impact height coefficient in step S5 is:

[0066]

[0067] Where N is the sum of the number of traces between measuring points A and B. This represents the number of traces.

[0068] The formula for calculating the impact section coefficient in step S5 is as follows:

[0069]

[0070] Where N is the sum of the number of traces at measuring points A and B.

[0071] The formula for calculating the impact compression coefficient in step S5 is as follows:

[0072]

[0073] Where N is the sum of the number of traces at measuring points A and B.

[0074] The lateral scanning in step S1 includes scanning along the first direction. Scan point A and along the second direction Scanning measurement point B, the longitudinal scan is a high-precision scan along the line connecting measurement points A and B.

[0075] The three coefficients in step S5 constitute a multi-coefficient coupled calculation model, which assesses the intensity of fluid loss by quantifying the effects of terrain destruction and sediment flow impact.

[0076] For example, the first step is to locate the target: a shallow seismic profiler is used to perform a first-stage lateral scan of the water body. , Two directions), to obtain two measuring points A and B (e.g. Figure 2 (as shown) and the complete acoustic profile results, as follows Figure 4 As shown.

[0077] Because each measuring point has its own width characteristics, along The structural features of point A in a horizontal scan can be simplified as follows: Figure 3 As shown; the high-resolution acoustic profile obtained after the point scan is completed is shown in the figure below. Figure 4 As shown.

[0078] Next, select the latitude and longitude coordinates PA0 = (EA0, NA0) at the middle position of the left structure, with the left edge as... The right edge is Since sonar scanning equipment has specific accuracy and resolution specifications, the scanning accuracy width unit Delta W and the number of scan lines at point A can be set according to the on-site conditions to calculate... Number of directional lines As in equation (1):

[0079] (1)

[0080] Similarly, along The structural features of point B in a horizontal scan can be simplified as follows: Figure 5 As shown, the latitude and longitude coordinates PB0 = (EB0, NB0) are selected when the left side of the structure is at its middle position, and the left edge is... The right edge is Here, the scanning accuracy, width unit (Delta), W, and number of scan lines at point B can be set according to the on-site working conditions to calculate... Number of directional routing lines N B As in equation (2):

[0081] (2)

[0082] In summary, we first counted the number of traces at measurement points A and B respectively, and then took the average of the number of traces at the two measurement points as the basis for the number of longitudinal scanning lines in the second stage.

[0083] After determining the number of longitudinal traces, a second scan is performed, along the direction of measuring points A and B, using high-precision longitudinal scanning (e.g. Figure 6 As shown), obtain complete shallow profile imaging, such as... Figure 7 As shown.

[0084] Gaps exist at the joints of the structures. Observation of the acoustic profile results reveals an upward reflection of sediment between adjacent structures (e.g., Figure 8 (As shown).

[0085] Calculate the impact height

[0086] The impact height can be determined by using water depth and topographic change data from the acoustic profile results. (like Figure 9 (As shown). For example, Figure 8 The image shows a location at a water depth of approximately 3.6 meters. At the structural connection point, the terrain is disrupted, resulting in sediment reflection towards the water surface and forming a pit approximately 1.3 meters deep. Considering the pit depth formed by the sediment reflection and the length of the impact to the water surface, the height of the sediment impact can be determined. It is approximately 4.9 meters.

[0087] Estimate the length of the impact point to the water surface

[0088] The deep crater formed by the reflection of sediment on the seabed is called the impact crater, and the height of the seabed surface from the water surface (i.e., the water depth) is the length of the impact crater to the water surface. like Figure 10 (As shown).

[0089] Impingement height coefficient

[0090] Impingement height coefficient is the average of the product of the width of the sediment reflection portion and the impingement height with the impingement port to the water surface length

[0091] (4)

[0092] wherein is the number of the width of the reflection portion.

[0093] When it is offshore, as shown in Figure 10 , the impingement height coefficient is 100%; it is defined as visible impingement.

[0094] Impingement section coefficient of sediment reflection

[0095] First, the width of the portion with sediment reflection is found , because the sediment is ejected from the gap between the structures, so the width of the portion with sediment reflection is the gap width between the two structures (as shown in Figure 11 ).

[0096] By knowing the width of the portion with reflection and the impingement height , the impingement section coefficient and the impingement compression coefficient can be found.

[0097] The impingement section coefficient is the average of the product of the width of the portion with reflection and the impingement height , as shown in equation (5):

[0098] (5)

[0099] The value of the impingement section coefficient directly depends on the interaction of the width of the portion with reflection and the impingement height . Generally, the gap width between the structures remains unchanged, i.e. the width of the portion with reflection remains unchanged, the higher the impingement height , the greater the impingement section coefficient; the impingement height is known to be related to the change in topographic structure, the greater the intensity of the destruction of the topographic structure, the higher the impingement height , and the greater the impingement section coefficient.

[0100] Similarly, the greater the impingement section coefficient, the greater the amount of seabed material transport, the width of the reflection portion remains unchanged, the higher the impingement height , the greater the impingement energy, and the greater the intensity of the destruction of the bottom topographic structure.

[0101] The impact compression coefficient is the impact height The ratio of the sum of the widths of the reflection portion and the impact portion The average of the sum of the ratios, as shown in equation (6):

[0102] (6)

[0103] As shown in equation (5) and equation (6), the higher the impact height , the greater the impact cross-section coefficient; the width of the reflection portion is constant, the higher the impact height , the greater the compression coefficient; similarly, the greater the compression coefficient, the greater the impact height , the greater the impact cross-section coefficient, the greater the unit pressure at the impact section, and the greater the energy delivered by the medium at the impact section.

[0104] The above merely provides a preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A method for evaluating the fluid loss strength of an underwater structure based on multi-dimensional acoustic scanning, characterized by, The method comprises the following steps: S1, by ROV carrying shallow stratigraphic profiler to scan the underwater structure in transverse and longitudinal two-way scanning, to obtain acoustic profile data; S2, based on the transverse scanning results, the number of A and B two measuring points is calculated, and the average value is taken as the basis for the number of longitudinal scanning; S3, from the acoustic profile results of longitudinal scanning, the sediment reflection phenomenon at the gap between the structures is identified; S4, extracting the impact height of the sediment reflection and the length of the impact opening to the water surface ; S5、based on 、 and having a reflection part width , calculate the impact height coefficient, impact cross section coefficient and impact compression coefficient, realize multi-dimensional quantitative evaluation of fluid loss intensity, the formula of the impact height coefficient is: Wherein, N is the sum of the number of A and B points, is the number of traces; The calculation formula of the impact cross section coefficient is: Wherein, N is the sum of the number of A and B measuring points; The calculation formula of the impact compression coefficient is: Wherein, N is the sum of the number of A and B measuring points.

2. The method of claim 1, wherein, In step S2, the calculation of the number of traces of the two measuring points A and B specifically includes: according to the on-site working condition, presetting the scanning accuracy width unit , respectively through the formula: Counting the number of traces and where , and , are structure edge points identified by acoustic profile results.

3. The method of claim 2, wherein, The The value of the parameter is determined by the precision resolution inherent to the sonar scanning device used and the turbidity, flow rate environmental conditions of the current water area.

4. The method of claim 1, wherein, The impact height in step S4 The determination specifically includes: in the longitudinal acoustic profile imaging result, the pit depth formed by the topographic damage caused by the sediment reflection is measured, and the length of the sediment impact trajectory extending to the water surface is comprehensively calculated.

5. The method of claim 1, wherein, Length of the impact port cut into the water surface in step S4 Water depth at the impact port location in an offshore environment.

6. The method of claim 1, wherein, The transverse scanning in step S1 comprises scanning along a first direction the A measurement points and along a second direction the B measurement points, the longitudinal scanning being a high-precision scanning cut along the direction of the A, B measurement point connecting line.

7. The method of claim 1, wherein, The three coefficients in step S5 constitute a multi-coefficient coupling calculation model, which quantifies the topographic damage and the impact effect of sediment flow to evaluate the intensity of fluid loss.

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