Real-time inversion method for three-dimensional shape of scour hole of bridge pier under reciprocating tidal current action

Abstract

This invention relates to a real-time inversion method for the three-dimensional morphology of bridge pier scour pits under reciprocating tidal currents. The method includes: setting up an ultrasonic real-time monitoring system for bridge pier scour depth at the location of the pier to be monitored; calculating the scour bottom elevation of the pier based on the monitoring data obtained from the ultrasonic real-time monitoring system and transmitting it to a server in real time; calculating the scour depth at a distance x from the maximum scour depth point on the cross-section and longitudinal sections of the scour pit using empirical formulas; calculating the two-dimensional elevation data of the scour pit using the elevations of each point on the cross-section and longitudinal sections; inverting the three-dimensional morphology of the scour pit using three-dimensional drawing software; and obtaining the real-time three-dimensional morphology of the bridge pier scour pit through the real-time monitoring system. This method combines the ultrasonic real-time monitoring system for bridge pier scour depth with empirical formulas for scour pit cross-section morphology, achieving real-time inversion of the three-dimensional morphology of scour pits on cross-sea bridge piers based on measured data, providing technical support for bridge safety assurance and stability assessment of surrounding marine structures.

Description

Technical Field

[0001] This invention relates to the field of calculation technology for bridge pier scour pits under tidal currents, and in particular to a method for real-time inversion of the three-dimensional morphology of bridge pier scour pits under reciprocating tidal currents. Background Technology

[0002] The construction of cross-sea bridges narrows water flow, leading to increased water velocity in certain areas upstream and downstream of the bridge and causing scour of the bridge piers. Real-time inversion of the three-dimensional morphology of scour pits on bridge piers helps to reasonably assess the safety and stability of cross-sea bridges and the impact of upstream and downstream topographic evolution on surrounding engineering structures.

[0003] Currently, there are three methods for predicting the morphology of bridge pier scour pits: (1) On-site topographic observation: The topography under the bridge pier is scanned using single-beam or multi-beam equipment to obtain the morphology of the scour pit. This method is costly and cannot achieve real-time inversion of the scour pit morphology. (2) Physical model test prediction: Based on the scale, a physical model of the engineering area is constructed using model sand and a bridge pier model. The morphology of the bridge pier scour pit is measured and then enlarged according to the scale. Since the model sand mainly considers the similarity of the starting point, it has high accuracy in simulating the depth of the scour pit; the suspension and settling characteristics of the model sand do not have a corresponding similarity with the prototype sand, resulting in a large error in simulating the morphology of the scour pit. Moreover, the physical model test cannot achieve real-time inversion of the scour pit morphology. (3) Numerical calculation model simulation: The hydrodynamic model is coupled with the empirical model of sediment transport to calculate the three-dimensional morphology of the bridge pier scour pit. The simulation results have high prediction accuracy for specific bridge piers and hydrodynamic environments, but lack universality. Numerical simulation relies on measured data for correction, but indoor test results are limited by laboratory power equipment, and the simulation results deviate significantly from actual engineering conditions. Engineering observation costs are high, and data is limited.

[0004] Traditional on-site topographic observation methods are costly; physical model testing focuses on the maximum depth of the scour pit, resulting in low accuracy in predicting the overall morphology of the scour pit, and the test results are mostly based on unidirectional flow conditions; numerical simulation methods rely on experimental or measured data for calibration and verification, and the simulation results lack universality. Moreover, none of the aforementioned methods can accurately invert the morphology of bridge pier scour pits in real time.

[0005] The foregoing background information is intended to help those skilled in the art understand prior art that is similar to the present invention, and to facilitate the understanding of the inventive concept and technical solution of this application. It should be clearly stated that, in the absence of clear evidence that the above content was disclosed before the filing date of this patent application, the foregoing background information should not be used to evaluate the novelty of the technical solution of this application. Summary of the Invention

[0006] To address the above problems, this invention proposes a real-time inversion method for the three-dimensional morphology of scour pits on quincunx-shaped bridge piers under reciprocating tidal currents. This method combines an ultrasonic real-time monitoring system for scour depth of bridge piers with empirical formulas for scour pit morphology. Based on measured data, it realizes the real-time inversion of the three-dimensional morphology of scour pits on cross-sea bridge piers, providing technical support for bridge safety assurance and stability assessment of surrounding marine structures.

[0007] To achieve real-time inversion of the three-dimensional morphology of bridge pier scour pits, this invention provides a method for real-time inversion of the three-dimensional morphology of bridge pier scour pits on viscous substrates under reciprocating tidal currents. Compared with physical model experiments and numerical simulation methods, this method has higher accuracy and greater practicality, and can obtain real-time updated scour pit morphology. This provides a basis for assessing the safety of bridge piers and the stability of surrounding marine structures during extreme weather events such as typhoons and storm surges. The specific technical solutions adopted are as follows.

[0008] A method for real-time inversion of the three-dimensional morphology of bridge pier scour pits under reciprocating tidal currents, including:

[0009] Step 1: Install an ultrasonic pier drilling depth real-time monitoring system at the location of the pier to be monitored;

[0010] Step 2: Calculate the scour elevation h of the pier to be monitored based on the monitoring data obtained from the ultrasonic pier scour depth real-time monitoring system. b ', and transmit it to the server in real time;

[0011] Step 3: Calculate the scour depth h at the distance x from the maximum scour depth point on the cross and longitudinal sections of the scour pit using the empirical formula (1) obtained from the fitting. s ;

[0012] (1)

[0013] In equation (1), h s Indicates the scouring depth; h b 'Indicates the elevation of the scour bottom surface; h b Indicates the maximum drawing depth; α represents the adjustment factor;

[0014] Step 4: Check the elevation h of each point on the cross-section and longitudinal section. s The planar two-dimensional elevation data of the scour pit were calculated, and the three-dimensional shape of the scour pit was inverted using three-dimensional drawing software.

[0015] Step 5: The elevation of the scour bottom surface of the pier, which is continuously transmitted from the ultrasonic pier scour depth real-time monitoring system to the indoor monitoring system, is used to perform three-dimensional morphology inversion of the scour pit to obtain the real-time three-dimensional morphology of the pier scour pit.

[0016] As a preferred embodiment of the technical solution of the present invention, in step one, the ultrasonic pier drilling depth real-time monitoring system includes an advanced ultrasonic sensor, a data acquisition instrument, and a wireless network transmission module.

[0017] As a preferred embodiment of the technical solution of the present invention, in step two, the elevation h of the scour bottom surface of the pier to be monitored is calculated based on the monitoring data obtained by the ultrasonic pier scour depth real-time monitoring system. b The specific steps are as follows: An ultrasonic wave is emitted to the riverbed surface. After a certain period of time, the reflected wave signal is received by the receiving probe. Using the ultrasonic wave velocity, the calculated round-trip time, and the elevation data from the real-time monitoring system, the elevation h of the riverbed scour surface is calculated. b '.

[0018] As a preferred embodiment of the technical solution of the present invention, in step three, the adjustment coefficient α is set to 0.01-0.2.

[0019] As a preferred embodiment of the technical solution of the present invention, in step three, the scour depth h at the distance x from the point of maximum scour depth on the longitudinal section of the scour pit is calculated according to formula (1a). s

[0020] (1a)

[0021] Among them, h bx ' represents the depth of each of 30 points taken at equal intervals within the cross-sectional width range -x' to x'.

[0022] A real-time inversion system for the three-dimensional morphology of bridge pier scour pits under reciprocating tidal currents, including:

[0023] The monitoring station is set up at the location of the bridge pier to be monitored and is configured to monitor terrain data in real time and transmit the data to the data center.

[0024] The data center is configured to perform real-time inversion of the three-dimensional morphology of the pier scour pit based on the detection data transmitted by the monitoring station, and executes the aforementioned real-time inversion method of the three-dimensional morphology of the pier scour pit under the action of reciprocating tidal current.

[0025] As a preferred embodiment of the technical solution of this invention, the monitoring station includes: an advanced ultrasonic sensor, a data acquisition instrument, and a wireless network transmission module. After receiving a data acquisition command, the sensor initiates measurement, and the measurement data is transmitted to the wireless transmission module. The wireless transmission module then transmits the data to an Internet server in the data center, where it is analyzed, verified, and stored in a database. The monitoring station can monitor the location of the bridge pier in real time by emitting ultrasonic waves to the riverbed surface at the pier location. After a certain period of time, the receiving probe receives the reflected wave signal. By setting the ultrasonic velocity, calculating the ultrasonic round-trip time, and using real-time elevation data from the monitoring system, the depth of bottom scour is calculated. Acquiring monitoring data using ultrasonic means is not affected by external factors such as environment, weather, and hydrology. It has high monitoring accuracy and is more universal than physical models or numerical calculation models. It does not have simulation errors and can accurately acquire bottom-level data, which is beneficial for the real-time inversion of the three-dimensional morphology of scour pits.

[0026] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the various processes of the above-mentioned method for real-time inversion of the three-dimensional morphology of bridge pier scour pits under reciprocating tidal current.

[0027] The beneficial effects of this application are as follows:

[0028] This invention uses measured scour depth of bridge piers and empirical formulas to invert the morphology of scour pits. Compared with physical model experiments and numerical simulation methods, it is more accurate and more practical.

[0029] This invention can obtain the morphological characteristics of scour pits within a plane range by inverting the scour elevation of bridge piers through a real-time monitoring platform, so that the scour pit morphology can be updated in real time, providing a basis for assessing the safety of bridge piers and the stability of water-related structures in the surrounding sea area during extreme weather such as typhoons and storm surges. Attached Figure Description

[0030] To make the above and / or other objects, features, advantages and examples of the present invention more apparent and understandable, the accompanying drawings used in the specific embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a flowchart illustrating the process of reconstructing scour pits.

[0032] Figure 2 A schematic diagram of an ultrasonic bridge pier drilling depth real-time monitoring system;

[0033] Figure 3 A schematic diagram showing the raw terrain data and wavelet-filtered terrain data;

[0034] Figure 4 A two-dimensional elevation diagram of the scour pit on the bridge pier.

[0035] Figure 5 A schematic diagram showing the three-dimensional shape of the scour pit on the bridge pier. Detailed Implementation

[0036] Those skilled in the art can refer to the content of this document and appropriately replace and / or modify the process parameters to achieve the desired results. However, it should be particularly noted that all similar replacements and / or modifications are obvious to those skilled in the art and are considered to be included in this invention. The products and preparation methods described in this invention have been described through preferred examples, and those skilled in the art can obviously modify or appropriately change and combine the products and preparation methods described herein without departing from the content, spirit, and scope of this invention to realize and apply the technology of this invention.

[0037] Unless otherwise defined, the technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which this invention pertains. This invention uses the methods and materials described herein; however, other suitable methods and materials known in the art may also be used. The materials, methods, and examples described herein are illustrative only and are not intended to be limiting. All publications, patent applications, patent cases, provisional applications, database entries, and other references mentioned herein are incorporated herein by reference in their entirety. In case of conflict, the definitions included in this specification shall prevail.

[0038] Unless otherwise specified, the materials, methods, and examples described herein are exemplary and not limiting. While similar or equivalent methods and materials can be used to implement or test the invention, suitable methods and materials are described herein.

[0039] like Figure 1 The flowchart shown illustrates a method for real-time inversion of the three-dimensional morphology of bridge pier scour pits under reciprocating tidal currents. First, the observed bridge pier is identified, and a single-beam echo sounder and a 3G / 4G / 5G wireless transmission device are installed. An ultrasonic remote real-time monitoring system is also installed. The system receives and processes water depth and distance data, and after noise filtering, determines the maximum real-time depth of the bridge pier scour pit. Further, based on empirical formulas for cross-sectional and longitudinal elevations, cross-sectional and longitudinal cross-sectional calculations are performed to obtain the planar elevation scour map of the pier scour pit. Based on the two-dimensional planar elevation of the pier scour pit, the three-dimensional morphology of the scour pit is inverted. By continuously updating the scour bottom elevation returned by the ultrasonic bridge pier scour depth monitoring system, the real-time inversion of the three-dimensional morphology of the bridge pier scour pit is achieved.

[0040] The present invention will now be described in detail with reference to specific implementation steps.

[0041] 1. Research area:

[0042] This invention focuses on the Zhoushan Island Link Project in the southern part of Hangzhou Bay, specifically the Jintang Bridge connecting Jintang Island and Ningbo. The southwestern part of the bridge's sea area relies on the coastlines of Zhenhai District and Beilun District on both sides of the Yongjiang River estuary, receiving water from the Yongjiang River. The eastern part is blocked by islands such as Jintang Island, connecting to the outer sea area via the Jintang Waterway, forming a tidal channel from the Jintang Waterway into Hangzhou Bay. The hydrodynamics of the project's sea area exhibit typical strong reciprocating tidal currents.

[0043] 2. Ultrasonic pier drilling depth real-time monitoring system

[0044] The ultrasonic pier scour depth real-time monitoring system consists of a data center and monitoring stations. The monitoring stations utilize advanced sensors and data acquisition technology to monitor parameters such as terrain. Upon receiving a data acquisition command, the sensors initiate measurements. The measurement data is transmitted via RS485 to a wireless transmission module, which then uses a 4G mobile network to transmit the data to an Internet server. After analysis and verification, the data is stored in a database. Computers and other terminal devices access the database via a browser using a B / S architecture to retrieve the corresponding terrain data. The system structure is as follows: Figure 2 As shown, the system adopts an integrated design of measurement, reporting, and control, and consists of sensors, telemetry terminals, communication modules, solar panels, battery packs, servers, etc.

[0045] An ultrasonic pier scour depth real-time monitoring system emits ultrasonic waves to the riverbed surface, and the reflected wave signal is received by a receiving probe after a certain period of time. By setting the ultrasonic velocity, calculating the round-trip time, and using real-time elevation data from the monitoring system, the scour depth of the riverbed is calculated. Wavelet filtering is used to remove data noise, such as... Figure 3 As shown.

[0046] 3. Real-time inversion of the three-dimensional morphology of bridge pier scour pits

[0047] The real-time scour bottom elevation h returned by the ultrasonic pier scour depth real-time monitoring system b First, the scour pit morphology of the cross section is calculated using equation (2). Within the cross section width range of -x' to x', 30 points are taken at equal intervals, and the depth h of each point is calculated accordingly. bx The longitudinal profile of the scour pit is calculated using formula (3).

[0048] (2)

[0049] (3)

[0050] By cross-sectional calculations, a two-dimensional elevation scour diagram of the pier scour pit was obtained, as shown below. Figure 4As shown, the 3D morphology of the scour pit is inverted using 3D drawing software. The elevation of the scour bottom surface of the pier, continuously transmitted from the ultrasonic pier scour depth real-time monitoring system to the indoor monitoring system, is used to invert the 3D morphology of the scour pit, achieving the goal of real-time display of the 3D morphology of the pier scour pit. Figure 5 As shown.

[0051] This invention proposes a real-time inversion method for the three-dimensional morphology of scour pits on bridge piers under reciprocating tidal currents. This method combines a real-time ultrasonic monitoring system for pier scour depth with empirical formulas for scour pit morphology to invert the scour pit shape. Compared with physical model experiments and numerical simulation methods, this method is more accurate and practical. Based on measured data, the real-time inversion of the three-dimensional morphology of scour pits on cross-sea bridge piers provides technical support for bridge safety assurance, especially for pier safety under extreme weather conditions such as typhoons and storm surges, and for the stability assessment of surrounding marine structures.

[0052] The present invention also provides a computer-readable storage medium storing a computer program thereon. When the computer program is executed by a processor, it implements each process of the above-mentioned real-time inversion method for the three-dimensional morphology of bridge pier scour pits under reciprocating tidal current, and can achieve the same technical effect. To avoid repetition, it will not be described in detail here.

[0053] Computer-readable media include both permanent and non-permanent, removable and non-removable media, which can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0054] The conventional techniques described in the above embodiments are existing technologies known to those skilled in the art, and therefore will not be described in detail here.

[0055] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0056] Although the present invention has been described in detail and specific embodiments have been cited, it will be apparent to those skilled in the art that various changes or modifications can be made without departing from the spirit and scope of the invention.

[0057] While the foregoing detailed descriptions have shown, described, and pointed out novel features applicable to various embodiments, it should be understood that various omissions, substitutions, and changes may be made to the form and details of the described apparatus or methods without departing from the spirit of this disclosure. Furthermore, the various features and methods described above may be used independently of each other or may be combined in various ways. All possible combinations and sub-combinations are intended to fall within the scope of this disclosure. Many of the foregoing embodiments include similar components, and therefore, these similar components are interchangeable in different embodiments. Although the invention has been disclosed in the context of certain embodiments and examples, those skilled in the art will understand that the invention extends beyond the specifically disclosed embodiments to other alternative embodiments and / or applications, as well as their obvious modifications and equivalents. Therefore, the invention is not intended to be limited to the specific disclosure of the preferred embodiments herein.

[0058] All matters not covered in this invention are common knowledge.

Claims

1. A method for real-time inversion of the three-dimensional morphology of bridge pier scour pits under reciprocating tidal currents, characterized in that... include: Step 1: Install an ultrasonic pier drilling depth real-time monitoring system at the location of the pier to be monitored; Step 2: Calculate the scour elevation h of the pier to be monitored based on the monitoring data obtained from the ultrasonic pier scour depth real-time monitoring system. b ', and transmit it to the server in real time; Step 3: Calculate the scour depth h at the distance x from the maximum scour depth point on the cross section of the scour pit using the empirical formula shown in equation (2). s ; (2) In equation (2), h s Indicates the scouring depth; h b 'Indicates the elevation of the scour bottom surface; h b Indicates the maximum drawing depth; Within the cross-sectional width range from -x' to x', 30 points are taken at equal intervals, and the depth h of each point is determined. bx The longitudinal profile of the scour pit is calculated using equation (3). (3)； Step 4: Calculate the two-dimensional elevation data of the scour pit by measuring the scour depth at each point on the cross and longitudinal sections, and then use three-dimensional drawing software to invert the three-dimensional shape of the scour pit. Step 5: The elevation of the scour bottom surface of the pier, which is continuously transmitted from the ultrasonic pier scour depth real-time monitoring system to the indoor monitoring system, is used to perform three-dimensional morphology inversion of the scour pit to obtain the real-time three-dimensional morphology of the pier scour pit.

2. The method for real-time inversion of the three-dimensional morphology of bridge pier scour pits under reciprocating tidal currents as described in claim 1, characterized in that: In step one, the ultrasonic pier drilling depth real-time monitoring system includes an advanced ultrasonic sensor, a data acquisition instrument, and a wireless network transmission module.

3. The method for real-time inversion of the three-dimensional morphology of bridge pier scour pits under reciprocating tidal currents as described in claim 1, characterized in that: In step two, the elevation h of the scour bottom surface of the pier to be monitored is calculated based on the monitoring data obtained from the ultrasonic pier scour depth real-time monitoring system. b The specific steps are as follows: An ultrasonic wave is emitted to the riverbed surface. After a certain period of time, the reflected wave signal is received by the receiving probe. Using the ultrasonic wave velocity, the calculated round-trip time, and the elevation data from the real-time monitoring system, the elevation h of the riverbed scour surface is calculated. b '.

4. A real-time inversion system for the three-dimensional morphology of bridge pier scour pits under reciprocating tidal currents, characterized in that... include: The monitoring station is set up at the location of the bridge pier to be monitored and is configured to monitor terrain data in real time and transmit the data to the data center. The data center is configured to perform real-time inversion of the three-dimensional morphology of the pier scour pit based on the detection data transmitted by the monitoring station, and in the process executes the real-time inversion method of the three-dimensional morphology of the pier scour pit under the action of reciprocating tidal current as described in any one of claims 1-3.

5. The method for real-time inversion of the three-dimensional morphology of bridge pier scour pits under reciprocating tidal currents as described in claim 4, characterized in that: The monitoring station includes: an advanced ultrasonic sensor, a data acquisition instrument, and a wireless network transmission module. After receiving the acquisition command, the sensor starts the measurement and transmits the measurement data to the wireless transmission module. The wireless transmission module transmits the data to the Internet server in the data center, where it is analyzed, verified, and stored in the database.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, it implements each process of the real-time inversion method for the three-dimensional morphology of bridge pier scour pits under reciprocating tidal currents as described in any one of claims 1-3.

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