CN219162374U - Mud line position tester integrated on seabed in-situ equipment - Google Patents
Mud line position tester integrated on seabed in-situ equipment Download PDFInfo
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- CN219162374U CN219162374U CN202223377215.4U CN202223377215U CN219162374U CN 219162374 U CN219162374 U CN 219162374U CN 202223377215 U CN202223377215 U CN 202223377215U CN 219162374 U CN219162374 U CN 219162374U
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Abstract
The utility model provides a mud line position tester integrated on submarine in-situ equipment, which comprises an acoustic transducer and a pressure sensor, wherein the identification method comprises water depth data inversion of water pressure data, acoustic inversion of suspended sediment concentration, accurate identification of mud line position and equipment settlement amount calculation. The method solves the problem that the spatial position relationship between the seabed in-situ equipment and the mud line cannot be determined under the influence of seabed surface sediment and equipment settlement coupling of the seabed in-situ equipment. Based on an acoustic inversion principle and a hydrostatic pressure calculation method, undisturbed observation is performed, and disturbance of the conventional contact type test method interface monitoring method to sediment on the surface layer of the seabed is avoided. The echo signal data and the pressure data are converted into sediment concentration data and water depth data, and the specific position of the submarine in-situ equipment can be accurately judged by combining the mud line spatial position tester.
Description
Technical Field
The utility model relates to the technical field of submarine in-situ exploration and monitoring, in particular to a mud line position tester integrated in submarine in-situ equipment.
Background
With the deep research of ocean science, resource and energy development and environmental protection, more and more engineering structures, in-situ equipment and the like are required to be paved on the sediment of the seabed surface layer and operated for a long time, such as a deep sea observation network, a pipe cable system, a mining car and the like. The design, construction and long-term operation of these structures are closely related to the physical and mechanical properties of the subsea surface deposit. Therefore, the physical and mechanical properties of the seabed surface sediment attract wide attention, the continuous development of the seabed surface sediment in-situ test technology is promoted, and the aim of detecting the seabed surface sediment physical parameters at full sea depth is fulfilled by the national key research and development project equipment 'Mei Ji No.' of the guy of the China university of ocean at present. However, the complex interaction process of the seabed surface sediment, the environmental water and the in-situ detection equipment in different sea areas leads to the difficulty in determining the position relationship between the sitting seabed in-situ equipment and mud lines, and the difficulty in analyzing the data acquired based on the in-situ equipment.
For example, in situ testing of the strength of a subsea surface sediment, a mud line is typically used as the upper interface of the seabed surface sediment, above which is an environmental body of water, which is a newtonian fluid. Below the mud line is a mixture of water and sediment (McKee et al 2004), defined as subsea surface sediment, with mechanical behavior of non-newtonian fluids (Nian et al 2019; zhang et al 2021). In the conventional in-situ test of the seabed, since the sediment intensity of the seabed surface layer below the mud line is very low, the in-situ equipment of the seabed is very likely to sink into deeper sediment, so that the spatial positions of the testing device and the mud line are difficult to determine (even the phenomenon that the initial position of the testing probe is below the mud line is likely to occur), and further, in-situ test data cannot accurately reflect the sediment intensity parameter of the seabed surface layer and the corresponding position thereof. Even with high precision probes (static penetration, full flow penetration) that collect data in real time, the low strength characteristics of the subsea surface deposit during penetration of the probe into the subsea surface deposit make it difficult to determine when the probe is in contact with the mud line from in situ test data.
Furthermore, in practical engineering applications, most subsea in-situ equipment needs to be located on the seabed. When the in-situ equipment on the seabed falls to the seabed, supporting feet of the in-situ equipment on the seabed are inevitably embedded into a certain depth of sediment on the surface layer of the seabed in many cases according to ocean engineering geological investigation experience, but under the current condition, the sinking depth is difficult to obtain and difficult to evaluate. It is therefore difficult to determine if an observation (or detection) instrument carrying subsea in situ equipment is above the mud line when contact with the mud line is initiated. More importantly, the sediment on the seabed surface layer close to the mud line is the most interesting part of ocean observation and engineering construction.
The current identification method is mostly based on a sensor penetrating into sediment to identify mud lines, such as a device and a method for in-situ measurement of the position and mechanical properties of a sea water-sediment interface, which are disclosed in patent (application number: 201810114193.1), and a pore pressure observation device and a working method for identifying a seabed interface based on a natural potential method, which are disclosed in patent (application number: 202110814070.0), respectively use a mechanical property test probe rod and an electrical property test probe rod to distinguish the interfaces in a penetrating manner. These are all contact test methods, which not only require one or more additional probes to be inserted, resulting in a significant increase in cost, but also the multiple inserted probes can disturb surrounding sediment and affect the testing of the penetration device. More importantly, during the process of penetrating the probe rod, the equipment carrying the probe rod is likely to displace, so that the synchronous working of the penetrating device and the spatial position testing device is required to be ensured.
Disclosure of Invention
In order to make up for the defects of the prior art, the utility model provides a mud line position tester integrated on in-situ equipment on the seabed, wherein the tester comprises an acoustic transducer and a pressure sensor, and the method comprises water pressure data depth data inversion, suspended sediment concentration acoustic inversion, accurate identification of the position of the mud line and calculation of equipment settlement amount, so that accurate judgment of the spatial position of the mud line in the settlement state of most in-situ equipment on the seabed can be realized.
The utility model is realized by the following technical scheme: the mud line position tester integrated on the submarine in-situ equipment comprises a pressure-resistant shell with a fixing device, a connecting channel arranged in the pressure-resistant shell, an acquisition and storage control unit, a battery, a connecting pipe, a pressure sensor and an acoustic transducer positioned at the lower end of the pressure-resistant shell, wherein the fixing device is fixedly arranged at the upper part of the pressure-resistant shell, one end of the fixing device is connected with the tester, the other end of the fixing device is connected with the submarine in-situ equipment, the acquisition and storage control unit is connected with the pressure sensor through a data line, and the data line extends to the acoustic transducer through the connecting channel; the pressure sensor collects the water pressure of the pressure at the top of the tester in real time through the connecting pipe; the acoustic transducer is positioned at the lower part of the tester, and the acquisition and storage control unit is used for setting the tester to transmit acoustic signals with specific thickness and layer to a section within the depth range below the installation position; the battery is positioned between the pressure sensor and the acoustic transducer, and supplies power to the pressure sensor, the acoustic transducer and the acquisition and storage control unit through wires.
The utility model adopts the technical proposal, and compared with the prior art, the utility model has the following beneficial effects:
(1) The utility model provides a mud line space position tester integrated on submarine in-situ equipment. The method solves the problem that the spatial position relationship between the seabed in-situ equipment and the mud line cannot be determined under the influence of seabed surface sediment and equipment settlement coupling of the seabed in-situ equipment.
(2) The mud line space position tester provided by the utility model has the advantages of small volume, easiness in installation, low power consumption, strong identification capability and the like, and can be used on most of submarine in-situ equipment through a fixing device to realize synchronous observation with the submarine in-situ equipment.
(3) The utility model is based on the acoustic principle, carries out undisturbed observation, avoids disturbance of the traditional contact type test method interface monitoring method to the sediment on the surface layer of the seabed, and ensures the accuracy of in-situ test data.
(4) The utility model converts echo signal data and pressure data into sediment concentration data and water depth data based on an acoustic inversion principle and a hydrostatic pressure calculation method, and can accurately judge the spatial position relation between the submarine in-situ equipment and the mudline by combining with the specific position of the mudline spatial position tester arranged on the submarine in-situ equipment, and accurately analyze the sedimentation depth of the submarine in-situ equipment.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, or may be learned by practice of the utility model.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of an apparatus;
FIG. 2 is a schematic view of an instrument mounting location and scope;
FIG. 3 is a schematic diagram of mud line position identification;
wherein, the correspondence between the reference numerals and the components in fig. 1 to 3 is:
1 fixing device, 2 collection and storage control unit, 3 connecting channels, 4 acoustic transducers, 5 connecting pipes, 6 pressure sensors, 7 batteries and 8 pressure-proof shells.
Detailed Description
In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced otherwise than as described herein, and therefore the scope of the present utility model is not limited to the specific embodiments disclosed below.
A mud line position tester and an identification method integrated in a subsea in-situ equipment according to an embodiment of the present utility model will be described in detail with reference to fig. 1 to 3.
As shown in fig. 1, the utility model provides a mud line position tester integrated on submarine in-situ equipment, which comprises a pressure-resistant shell 8 with a fixing device 1, a connecting channel 3, an acquisition and storage control unit 2, a battery 7, a connecting pipe 5, a pressure sensor 6 and an acoustic transducer 4 positioned at the lower end of the pressure-resistant shell 8, wherein the fixing device 1 comprises four screws, a fixing buckle and a fixing rod, the four screws are evenly distributed on the upper part of the pressure-resistant shell 8, the fixing rod is provided with a mounting hole, the screws penetrate through the mounting hole to fix the tester on the fixing buckle, one end of the fixing buckle is connected with the tester, and the other end of the fixing buckle is connected with the submarine in-situ equipment, so that the tester is fixed. The acquisition and storage control unit 2 is connected with the pressure sensor 6 through a data line, and the data line extends to the acoustic transducer 4 through the connecting channel 3, so that the acquisition and storage control unit 2 can set, adjust and store the sensor test parameters; the pressure sensor 6 collects the water pressure of the pressure at the top of the tester in real time through the connecting pipe 5; the acoustic transducer 4 is positioned at the lower part of the tester, and the acquisition and storage control unit 2 is used for setting the tester to emit acoustic signals with specific thickness and horizon to a section within the depth range below the installation position, each sampling depth interval can be set, and receiving signals reflected by silt or other suspended particles in the depth section; the battery 7 is positioned between the pressure sensor 6 and the acoustic transducer 4, and supplies power to the pressure sensor 6, the acoustic transducer 4 and the acquisition and storage control unit 2 through wires;
the identification method of the mud line position tester integrated on the submarine in-situ equipment specifically comprises the following steps:
step 1: determining the substrate condition of the instrument laying position according to the survey of the regional sea state and geological information;
step 2: the pressure sensor is calibrated according to the national standard (GB/T12763.10-2007), and the device observation time, the acquisition frequency and the acoustic layering thickness are sethDetermining cable, deployment vessel and deployment date and station longitude and latitude
；
Step 3: the tester is fixed on the framework of the sitting-bottom type submarine in-situ equipment by using the fixing device 1, no shielding object exists below the tester, the transmission of acoustic signals cannot be shielded, and the normal use of other carried observation instruments is not influenced; recording the height of the mounting position from the support legH，HNamely, the observation range of the acoustic signal of the tester; the instrument-related positions are shown in fig. 2.
Step 4: the water is put down to a designated place to carry out a test, and after all the observations are completed, the water is recovered; the device is disassembled, maintained and saved on land, the data in the acquisition and storage control unit 2 are read, the real-time water depth is obtained, and the correction of echo signals is completed; the method specifically comprises the following steps:
step 4.1: processing in-situ acquired water pressure data, and averaging the water pressure data observed in real time by the pressure sensor 6 with a segmentation period of ten minutes to obtain average water pressure
Removing water pressure change caused by high-frequency factors; formula (1) will be based on hydrostatic pressure calculation method>
Is converted into water depth data of the observation equipment,
wherein, the liquid crystal display device comprises a liquid crystal display device,
the water depth, m, of the installation position of the instrument; />
Is of sea water density of kg.m -3 ；/>
Gravitational acceleration, m.s -2 ；/>
Is the average water pressure, pa;
step 4.2: longitude and latitude combined with instrument layout position
Instrument mounting depth +.>
Obtaining the spatial position of the marine bottom in situ test device>
。
Step 4.3: the echo signal obtained by the acoustic transducer 4 is distorted due to noise influence, signal propagation attenuation and other factors, and cannot be directly used, and the original echo signal is obtained by using the formula (2)
Back scattering intensity corrected to reflect water body suspended sand concentration>
；
Wherein, the liquid crystal display device comprises a liquid crystal display device,
is the back scattering intensity, dB; />
=0.4 is the received signal unit conversion factor, dB count -1 ；/>
The echo intensity received by the instrument is count; />
Is system noise, dB; />
Is the distance from the acoustic transducer 4 to the observation position, calculated from the layering thickness, m; />
Is the absorption coefficient, obtained by the deposit properties of step 1, dB.m -1 ；CIs a constant related to the transducer, and comprises errors caused by factors such as a transmission pulse, a transmission power performance parameter and the like, and dB is calculated through the performance index of the transducer.
Step 5: and (3) performing an indoor instrument calibration experiment, so that actual in-situ test data correspond to each other, and giving out a space corresponding position of a mud line and a device sedimentation distance to guide engineering design and scientific research. The method specifically comprises the following steps:
step 5.1: the method comprises the steps of performing a calibration test indoors by using a substrate identical to an observation position, fixing a mud line identification device above a calibration barrel, starting an instrument, and performing suction filtration experiments on water samples at different positions to obtain suspended sediment concentration
；
Step 5.2: collecting water sample suction filtration test data
And the backscattering intensities after the corresponding position correction are fitted according to the formula (3), and the fitting coefficient is determined>
；
Wherein, the liquid crystal display device comprises a liquid crystal display device,
to suspend the sediment concentration, kg.m -3 ；/>
Is the back scattering intensity, dB; />
Is->
Fitting the obtained parameters;
step 5.3: the fitting coefficient is brought into a formula (3) to obtain the concentration of suspended sediment
Backscatter intensity->
And further obtain the following observation section of the testerHSuspended sediment concentration in the range;
step 5.4: for the suspended sediment concentration to be of layered heighthPerforming concentration gradient calculation by taking independent variables and layering concentration as dependent variables; gradient ofThe calculation of (a) may be based on a gradient function of Matlab;
step 5.5: based on the difference of the suspended sediment concentration in the environmental water body and under the mud line, searching the height position of the gradient maximum value from top to bottom to obtain the mud line positionH 1 As in fig. 3;
step 5.6: according to the installation position of the tester on the bottom equipment, the sedimentation depth can be determinedH 2 =H–H 1 。
In the description of the present utility model, the term "plurality" means two or more, unless explicitly defined otherwise, the orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present utility model; the terms "coupled," "mounted," "secured," and the like are to be construed broadly, and may be fixedly coupled, detachably coupled, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (1)
1. The mud line position tester integrated on the seabed in-situ equipment comprises a pressure-resistant shell (8) with a fixing device (1), a connecting channel (3) arranged inside the pressure-resistant shell (8), a collection and storage control unit (2), a battery (7), a connecting pipe (5), a pressure sensor (6) and an acoustic transducer (4) positioned at the lower end of the pressure-resistant shell (8), and is characterized in that the fixing device (1) is fixedly arranged at the upper part of the pressure-resistant shell (8), one end of the fixing device is connected with the tester, the other end of the fixing device is connected with the seabed in-situ equipment, the collection and storage control unit (2) is connected with the pressure sensor (6) through a data line, and the data line extends to the acoustic transducer (4) through the connecting channel (3); the pressure sensor (6) is used for collecting the water pressure of the pressure at the top of the tester in real time through the connecting pipe (5); the acoustic transducer (4) is positioned at the lower part of the tester, and the acquisition and storage control unit (2) is used for setting the acoustic signals of thickness and horizon of the tester to be emitted to the section within the depth range below the installation position; the battery (7) is positioned between the pressure sensor (6) and the acoustic transducer (4), and is used for supplying power to the pressure sensor (6), the acoustic transducer (4) and the acquisition and storage control unit (2) through wires.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223377215.4U CN219162374U (en) | 2022-12-16 | 2022-12-16 | Mud line position tester integrated on seabed in-situ equipment |
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| CN202223377215.4U CN219162374U (en) | 2022-12-16 | 2022-12-16 | Mud line position tester integrated on seabed in-situ equipment |
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