CN108592993A - Deep seafloor boundary layer dynamic observation device and method - Google Patents
Deep seafloor boundary layer dynamic observation device and method Download PDFInfo
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- CN108592993A CN108592993A CN201810276805.7A CN201810276805A CN108592993A CN 108592993 A CN108592993 A CN 108592993A CN 201810276805 A CN201810276805 A CN 201810276805A CN 108592993 A CN108592993 A CN 108592993A
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- 238000005259 measurement Methods 0.000 claims abstract description 12
- 239000000523 sample Substances 0.000 claims description 40
- 239000013535 sea water Substances 0.000 claims description 16
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000002689 soil Substances 0.000 claims description 10
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- 238000011065 in-situ storage Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
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- 230000003628 erosive effect Effects 0.000 claims description 3
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- 230000035515 penetration Effects 0.000 claims description 3
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- 238000004062 sedimentation Methods 0.000 claims description 2
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- 230000000737 periodic effect Effects 0.000 abstract 1
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- 230000003287 optical effect Effects 0.000 description 1
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- 238000005070 sampling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a kind of deep seafloor boundary layer dynamic observation device and methods, the observation device includes bottom contact switch and feeler lever, affiliated bottom contact switch includes hook, pilotage weight, triggering cable, armored cable, bottoms out controller, triggering receiver and driving unit, the feeler lever includes overhead bin and the body of rod, and corrosion resistant metal guide vane and hanging ring are formed on the overhead bin；The body of rod top is cylindrical, lower part is in coniform, and junction is provided with high intensity grid catch, several electrode sequences are formed on the body of rod.Its method includes：Interior rectifies an instrument, and using auxiliary ship positionning and lays observation device, is controlled according to design early period and bottom contact switch, a feeler lever part is made to be inserted into sea bed, and periodic measurement simultaneously corrects, and can get marine boundary layer change procedure.The configuration of the present invention is simple, easy to operate, reliable operation, can adapt to deep-sea high-pressure environment, and record is observed to certain depth range above and below seabed interface, and can monitor the variation of sea bed elevation.
Description
Technical Field
The invention belongs to the technical field of marine measurement, and particularly relates to a dynamic observation device and method for a deep sea seabed boundary layer.
Background
The extent of the seafloor boundary layer is the area above and below the seafloor interface where hydrodynamic forces interact with the seafloor, which contains both disturbed currents and disturbed sediment layers below the seafloor. Dynamic processes frequently occur in the seabed boundary layer, and the method is an important way for realizing the exchange of seabed and seawater substances. The dynamic change of the seabed boundary layer has great significance to the process of sediment erosion suspension and deep sea sediment evolution under the action of deep sea power.
The observation means of the seabed boundary layer mainly comprises: the method comprises the steps of on-site conventional water body sampling and suction filtration, an optical backscattering technology, an on-site laser particle size analyzer and an acoustic technology. The prior art can only observe the change information of the sea bed surface or above, the comprehensive observation of the upper and lower sea bed interfaces needs a plurality of instruments and a plurality of measurement methods, the operation is complex, the cost is huge, and the technologies need complex unified correction. At present, an instrument which is applied to the deep sea bottom and can observe the inside of the sea bottom and the change of the sea water is urgently needed. The invention fills the gap and promotes the progress of dynamic observation of the deep sea seabed boundary layer in China.
Disclosure of Invention
The invention aims to provide a dynamic observation device and a dynamic observation method for a deep sea floor boundary layer, which are used for realizing in-situ synchronous observation of the deep sea floor boundary layer, and comprise not only surface sediment of the sea floor, but also potential value change of suspended matters in a near-bottom water body.
The technical solution adopted by the invention is that
The device is characterized by comprising a bottom-touching switch and a probe rod, wherein the bottom-touching switch comprises a hook, a pilot weight, a trigger cable, an armored cable, an intelligent controller, a trigger receiver and a driving unit, the intelligent controller is connected with the trigger receiver through an input circuit, the trigger receiver is connected with the trigger cable, and the intelligent receiver is connected with the driving unit through an output circuit. The probe rod comprises a top cabin and a rod body, the rod body is connected with the top cabin, and a main processor of the top cabin is connected with an intelligent controller of the bottom-touching switch through an armored cable. The top cabin is made of corrosion-resistant metal, corrosion-resistant metal guide vanes and a hanging ring are formed on the top cabin, a built-in power supply, a main processor, a storage, a data acquisition circuit, a sensing circuit, an acceleration sensor and an attitude sensor are formed in the top cabin, the built-in power supply supplies power to the main processor, the data acquisition circuit and the sensing circuit, the main processor is respectively connected with the data acquisition circuit and the sensing circuit, and the sensing circuit is connected with the acceleration sensor and the attitude sensor.
After the piloting heavy hammer is in bottom contact, the trigger receiver obtains a signal through the trigger cable and transmits the signal to the intelligent controller through the input circuit, and the intelligent controller starts the driving unit through the output circuit to release the probe rod and simultaneously transmits the signal to the probe rod main processor.
The electrode array is characterized in that a plurality of electrode sequences are formed on the rod body, the electrode sequences are arranged on the rod body in a mode of being communicated with the outside, the electrode sequences are connected with a data acquisition circuit through leads positioned in the rod body, any four adjacent electrodes form an electrode group, the middle two electrodes are measuring electrodes, and the two ends of the electrodes are power supply electrodes. And after the main processor obtains the signal transmitted by the intelligent controller, the main processor controls the data acquisition circuit to supply power to the power supply electrode and measures the potential difference between the two measuring electrodes.
The rod body comprises an insulating tube and a corrosion-resistant high-strength metal tube formed in the insulating tube, a plurality of grooves are formed in the insulating tube at intervals along the length direction of the insulating tube, and one electrode is formed in each groove. The corrosion-resistant high-strength metal pipe is characterized in that a conical part is formed at one end of the corrosion-resistant high-strength metal pipe, a lead penetrates through the corrosion-resistant high-strength metal pipe, and a lead connecting circuit board is formed at the other end of the corrosion-resistant high-strength metal pipe.
The device and the method for dynamically observing the deep sea seabed boundary layer are characterized by comprising the following steps:
1) performing an indoor correction test by using an observation device, simulating the real seabed condition, and determining the potential difference and the change characteristics in the indoor seabed and the water body;
obtaining a correction coefficient f;
2) the observation device and the bottom-touching switch are detected and set to ensure that all sensors are in a normal working state, and then the sensors are installed in the top cabin for sealing, the probe rod and the bottom-touching switch are connected through a hanging ring, and meanwhile, a main processor in the top cabin of the probe rod is also connected with an intelligent controller of the bottom-touching switch through an armored cable, the armored cable is also connected with a hook, and the armored cable can be communicated and can bear load;
3) according to the substrate data and the dynamic sounding data of the target point location, calculating the cone tip resistance and the side friction resistance of the seabed of the point location and determining the penetration degree, and designing the proper length of the trigger cable and the annular counterweight according to the cone tip resistance and the side friction resistance to ensure that the rod body can be inserted into the seabed;
4) driving the auxiliary ship to a target point position by using a GPS (global positioning system) of the auxiliary ship;
5) hoisting the observation device by using a shipborne hoisting device and a laying cable through an upper hook of the bottoming switch, and lowering the observation device into the sea to the surface of the seabed, wherein the laying cable is in a vertical state in the laying process;
6) after a piloting heavy hammer touches the surface of a seabed, a trigger receiver sends a signal to an intelligent controller, the intelligent controller sends a signal to a driving unit through an output circuit, the signal is transmitted to a probe rod main controller through an armored cable, the driving unit starts and releases a probe rod, the probe rod is inserted into the seabed in a free-falling mode by means of self gravity, through the pre-designed weight of the probe rod and the length of the trigger cable, one part of the probe rod can be ensured to be inserted into the seabed and the other part is positioned in a water body by utilizing the characteristics of different upper and lower diameters of the probe rod and a self-provided high-strength grating baffle plate, and after the probe rod main controller receives the signal of a bottom touch switch, the measurement work is carried out according to a preset period;
7) after the in-situ observation period is finished, the auxiliary ship lifts the observation device through the recovery cable rope, and the bottoming switch drives the probe rod through the armored cable to recover the probe rod and the probe rod together;
8) reading the observation data of the memory, and acquiring the real-time ocean soil resistivity according to the following formula by utilizing the acquired real-time potential differences of the electrodes:
wherein,p is a geometric factor, p is the resistivity of the soil body, delta U is the potential difference of the measuring section, I is the intensity of the power supply current, a is the distance between two adjacent measuring electrodes, and b is the radius of the annular electrode ring;
obtaining a correction coefficient f by using the indoor data, and correcting the result;
and then, correcting elevation change through data recorded by the attitude sensor, performing depth correction through data recorded by the acceleration sensor, and finally obtaining a vertical resistivity change process.
9) The method for determining the seabed boundary layer comprises the following steps: the part with the largest resistivity is the resistivity of the seabed, the midpoint between the first maximum value and the last minimum value is the seabed surface, the upper part is the seawater resistivity, the part with the smallest resistivity is unaffected seawater, and the median part of the resistivity is a water body boundary layer. And comparing the data of different measurement periods to obtain the change process of the seabed boundary layer.
The beneficial technical effects of the invention are as follows:
compared with the prior art, the method is simple to operate and accurate in observation, can be used for simultaneously observing the potential values of the seabed surface sediment and suspended matters in the near-bottom water body in the sea area where the observation device is arranged, and can accurately reflect the property change of the seabed internal sediment, the height change of the seabed surface and the change of the near-bottom seawater. The device can be recycled, has strong reusability, and can greatly save observation cost. The instrument can realize the observation of three elements of the sea bed surface layer, the sea bed surface and the near-bottom seawater, provides support for further and deeply knowing the change of the sea bed boundary layer caused by ocean power, and is the development trend of future ocean observation.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a dynamic observation device for a deep sea seabed boundary layer according to the present invention;
FIG. 2 is a cross-sectional view of a probe of the viewing device of the present invention;
FIG. 3 is a cross-sectional view of a bottoming switch of the observation device of the present invention.
FIG. 4 is a flow chart of the device and method for observing the dynamic state of the deep sea seabed boundary layer.
FIG. 5 is a view showing the arrangement and recovery process of the observation device of the present invention.
FIG. 6 is a schematic representation of the boundary layer resistivity curve of the seafloor measured in accordance with the present invention
In the figure, I-a bottom-touching switch, II-a probe rod, 1-a piloting heavy hammer, 2-a trigger cable, 3-a shell, 4-an armored cable, 5-a guide vane, 6-a top cabin, 7-a lifting ring, 8-a rod body, 9-an annular balancing weight, 10-an insulating pipe, 11-a corrosion-resistant metal pipe, 12-a conducting wire, 13-an electrode sequence, 14-a grid block, 15-a trigger receiver, 16-a bottom-touching controller, 17-a hook and 18-a driving unit.
Detailed Description
As shown in fig. 1-3, a dynamic observation device for a deep sea seabed boundary layer is characterized by comprising a bottom-touching switch I and a probe II, wherein the probe II comprises a top cabin 6 made of corrosion-resistant material and a rod body 8 connected to the bottom of the top cabin 6, a guide vane 5 is arranged on the outer side of the top cabin 6, a hook 7 is arranged at the top, and a built-in power supply, a main processor, a memory, a data acquisition circuit, a sensing circuit, an acceleration sensor and an attitude sensor are arranged in the top cabin 6; the main processor is respectively connected with the data acquisition circuit and the sensing circuit, and the sensing circuit is connected with the acceleration sensor and the attitude sensor; the bottom of the rod body 8 is conical, a cylindrical part is arranged above the conical part of the rod body 8, a grating baffle 14 is arranged at the joint of the cylindrical part and the conical part, and an annular balancing weight 9 is arranged on the outer side surface of the upper part of the rod body 8;
a plurality of annular electrodes 13 are arranged on the outer side surface of the rod body 8 so as to form an electrode sequence, the electrodes 13 are connected with a data acquisition circuit in the top cabin 6 through leads 12 positioned in the rod body 8, any adjacent four electrodes 13 form an electrode group, the middle two electrodes are measuring electrodes, and the two ends are power supply electrodes; the main processor controls a data acquisition circuit to supply power to the power supply electrode and measures the potential difference between the two measuring electrodes;
the bottom-touching switch I comprises a shell 3, a triggering cable 2 and a piloting heavy hammer 1, a triggering receiver 15, a driving unit 18 and a bottom-touching control unit 16 are arranged in the shell 3, the bottom-touching control unit 16 is connected with the triggering cable 2 through the triggering receiver 15, the other end of the triggering cable 2 is connected with the piloting heavy hammer 1, the shell 3 is connected with the top cabin 6 through an armored cable 4, and a hook 17 (or a hanging ring) is further arranged at the top of the shell 3.
The dynamic observation device for the deep sea seabed boundary layer is characterized in that the rod body 8 comprises an insulating pipe 10 and a corrosion-resistant metal pipe 11 inside the insulating pipe 10, a plurality of grooves are formed at intervals in the insulating pipe 10 along the length direction of the insulating pipe, and one electrode 13 is arranged in each groove; the bottom end of the corrosion-resistant metal pipe 13 forms a conical tip part, a lead 12 penetrates through the corrosion-resistant metal pipe 13, and the other end of the corrosion-resistant metal pipe 13 is integrated with a lead patch panel.
The dynamic observation device for the deep sea seabed boundary layer is characterized in that the rod body 8 comprises an insulating pipe 10 and a corrosion-resistant metal pipe 11 inside the insulating pipe 10, a plurality of grooves are formed at intervals in the insulating pipe 10 along the length direction of the insulating pipe, and one electrode 13 is installed in each groove; the bottom end of the corrosion-resistant metal pipe 13 forms a conical tip part, a lead 12 penetrates through the corrosion-resistant metal pipe 13, and the lead 12 is connected with each electrode 13 and a data acquisition circuit in the top cabin 6.
The dynamic observation method of the deep sea seabed boundary layer mainly comprises the following steps:
the observation device is corrected through an indoor correction test, the observation device and the bottoming switch are detected and set, the auxiliary ship is used for loading the observation device and driving to a target point position, the auxiliary ship rear deck hoisting device is used for laying the observation device, the observation device is arranged according to a set period after laying is completed, the observation device is recycled after the in-situ observation period is completed, and the change process of the seabed boundary layer can be obtained through analysis and correction data.
The steps of this embodiment are described below with reference to fig. 4-5:
the method for dynamically observing the deep sea seabed boundary layer by using the observation device is characterized by comprising the following steps of:
1) indoor calibration test:
1.1) firstly inserting the observation device into a large simulation water tank;
1.2) then simulating the erosion and sedimentation process of a real seabed, precisely measuring the height change of the seabed in the whole process by using a laser range finder, and simultaneously measuring by using the observation device provided with a plurality of annular electrodes (13);
1.3) comparing the measurement result of the observation device with the measurement result of the laser range finder, and establishing the relationship between the observation result of the observation device and the real change of the seabed to obtain a correction coefficient f;
and (3) establishing a real-time ocean soil resistivity calculation formula by using the correction coefficient f:
wherein f is a correction coefficient,p is a geometric factor, p is the resistivity of the soil body, delta U is the potential difference of the measuring section, I is the intensity of the power supply current, a is the distance between two adjacent measuring electrodes, and b is the radius of the annular electrode ring;
2) the observation device is detected and set to ensure that all sensors are in a normal working state, then all sensors are installed in a top cabin 6 to be sealed, a probe rod II is connected with a driving unit of a bottom-touching switch I through a hook 7 at the top, a main processor in the top cabin 6 is connected with a bottom-touching control unit in the bottom-touching switch I through an armored cable 4, and the armored cable 4 can be communicated and can bear load;
3) according to the substrate data and the dynamic sounding data of the target point location, calculating the cone tip resistance and the side friction resistance of the seabed of the point location and determining the penetration degree, and designing an annular balance weight according to the cone tip resistance and the side friction resistance to ensure that the rod body can be inserted into the seabed; the length of the trigger cable 2 is set according to the depth of the seawater;
4) driving the auxiliary ship to a target point position by using a GPS (global positioning system) of the auxiliary ship;
5) hoisting the observation device by using a shipborne hoisting device and a laying cable through a hoisting ring at the top of the bottom contact switch I, and placing the observation device into the sea downwards towards the surface direction of the seabed, wherein the laying cable is in a vertical state in the laying process;
6) the piloting heavy hammer 1 of the bottom switch I is lowered along with the whole observation device, after the piloting heavy hammer 1 firstly touches the surface of a seabed, a trigger receiver 15 sends a signal to a bottom touch controller 16 in the bottom touch switch I, the bottom touch controller 16 sends a control signal to a driving unit 18, meanwhile, the bottom touch controller 16 sends a signal to a main controller in a top cabin 6 through an armored cable 4, the driving unit 18 starts and releases a probe rod II, the probe rod II is inserted into the seabed in a free falling mode in seawater by means of self gravity, a cone at the bottom of the probe rod II and a self-provided grating baffle 14 are utilized, one part of the probe rod II is inserted into the seabed, the other part of the probe rod II is positioned in a water body, and after the main controller of the probe rod II receives a bottom touch signal, measurement work is carried out according to a period set in advance;
7) after the in-situ observation period is finished, the auxiliary ship lifts the observation device through the recovery cable, and at the moment, the bottoming switch I drives the probe rod II through the armored cable to recover the probe rod II and the probe rod II together;
8) reading the observation data of the memory, establishing a real-time ocean soil resistivity calculation formula by using the step 1, calculating the ocean soil resistivity change process in the whole observation process, then correcting elevation change through the data recorded by the attitude sensor, and performing depth correction through the data recorded by the acceleration sensor to finally obtain the change process of vertical resistivity;
9) determining a seabed boundary layer: the part with the largest resistivity is the resistivity of the seabed, the midpoint between the first maximum value and the last minimum value is the seabed surface, the upper part is the seawater resistivity, the part with the smallest resistivity is unaffected seawater, and the middle part of the resistivity is a water body boundary layer;
10) repeating the steps 1-9 in different periods, and comparing data in different measurement periods to obtain the dynamic change process of the submarine boundary layer.
FIG. 6 is a schematic diagram of the potential difference curve of the boundary layer of the sea bottom measured by the method of the above embodiment, and with reference to FIG. 6, the method for determining the boundary layer of the sea bottom is as follows: the part with the largest resistivity is the resistivity of the seabed, the midpoint between the first maximum value and the last minimum value is the resistivity of the seabed, the upper part of the seabed is the resistivity of the seawater, the part with the smallest resistivity is the unaffected seawater, and the middle part of the resistivity is the seabed boundary layer.
Claims (3)
1. A dynamic observation device for a deep sea seabed boundary layer is characterized by comprising a bottom-touching switch (I) and a probe rod (II), wherein the probe rod (II) comprises a top cabin (6) made of corrosion-resistant materials and a rod body (8) connected to the bottom of the top cabin (6), a guide vane (5) is arranged on the outer side of the top cabin (6), a hook (7) is arranged at the top of the top cabin, and a built-in power supply, a main processor, a memory, a data acquisition circuit, a sensing circuit, an acceleration sensor and an attitude sensor are arranged in the top cabin (6); the main processor is respectively connected with the data acquisition circuit and the sensing circuit, and the sensing circuit is connected with the acceleration sensor and the attitude sensor; the bottom of the rod body (8) is conical, a cylindrical part is arranged above the conical part of the rod body (8), a grating baffle plate (14) is arranged at the joint of the cylindrical part and the conical part, and an annular balancing weight (9) is arranged on the outer side surface of the upper part of the rod body (8);
a plurality of annular electrodes (13) are arranged on the outer side surface of the rod body (8) so as to form an electrode sequence, the electrodes (13) are connected with a data acquisition circuit in the top cabin (6) through leads (12) positioned in the rod body (8), any four adjacent electrodes (13) form an electrode group, the middle two electrodes are measuring electrodes, and the two ends are power supply electrodes; the main processor controls a data acquisition circuit to supply power to the power supply electrode and measures the potential difference between the two measuring electrodes;
touch end switch (I) and include shell (3), trigger cable (2) and piloting weight (1), be equipped with in shell (3) and trigger receiver (15), drive unit (18) and touch end controller (16), touch end controller (16) and link to each other with triggering cable (2) through trigger receiver (15), trigger cable (2) other end and piloting weight (1) and link to each other, shell (3) through armoured cable (4) with top cabin (6) link to each other, shell (3) top still is equipped with couple (17).
2. The deep sea boundary layer dynamic observation device according to claim 1, characterized in that said rod body (8) comprises an insulating tube (10) and a corrosion-resistant metal tube (11) inside said insulating tube (10), said insulating tube (10) is formed with a plurality of grooves at intervals along the length direction thereof, and each of said grooves is provided with one of said electrodes (13); the bottom end of the corrosion-resistant metal pipe (13) forms a conical tip part, a lead (12) penetrates through the corrosion-resistant metal pipe (13), and the lead (12) penetrates through the metal pipe and is connected with each electrode (13) and a data acquisition circuit in the top cabin (6).
3. Method for dynamic observation of deep sea seafloor boundary layer using the observation device of claim 1, comprising the steps of:
1) indoor calibration test:
1.1) firstly inserting the observation device into a large simulation water tank;
1.2) then simulating the erosion and sedimentation process of a real seabed, precisely measuring the height change of the seabed in the whole process by using a laser range finder, and simultaneously measuring by using the observation device provided with a plurality of annular electrodes (13);
1.3) comparing the measurement result of the observation device with the measurement result of the laser range finder, and establishing the relationship between the observation result of the observation device and the real change of the seabed to obtain a correction coefficient f;
and (3) establishing a real-time ocean soil resistivity calculation formula by using the correction coefficient f:
wherein f is a correction coefficient,p is a geometric factor, p is the resistivity of the soil body, delta U is the potential difference of the measuring section, I is the intensity of the power supply current, a is the distance between two adjacent measuring electrodes, and b is the radius of the annular electrode ring;
2) the observation device is detected and set to ensure that all sensors are in a normal working state, then all sensors are installed in a top cabin (6) to be sealed, a probe rod (II) is connected with a driving unit of a bottom-touching switch (I) through a hook (7) at the top, a main processor in the top cabin (6) is connected with a bottom-touching control unit in the bottom-touching switch (I) through an armored cable (4), and the armored cable (4) can be communicated and can bear load;
3) according to the substrate data and the dynamic sounding data of the target point location, calculating the cone tip resistance and the side friction resistance of the seabed of the point location and determining the penetration degree, and designing an annular balance weight according to the cone tip resistance and the side friction resistance to ensure that the rod body can be inserted into the seabed; the length of the trigger cable (2) is set according to the depth of the seawater;
4) driving the auxiliary ship to a target point position by using a GPS (global positioning system) of the auxiliary ship;
5) hoisting the observation device by using a shipborne hoisting device and a laying cable through a top hoisting ring of a bottom contact switch (I), and placing the observation device into the sea in the direction of the surface of the seabed, wherein the laying cable is in a vertical state in the laying process;
6) the piloting heavy hammer (1) of the bottom contact switch (I) is lowered along with the whole observation device, after the piloting heavy hammer (1) firstly touches the seabed surface, the trigger receiver (15) sends a signal to a bottom contact controller (16) in the bottom contact switch (I), the bottom contact controller (16) sends a control signal to a driving unit (18), meanwhile, a bottom controller (16) sends a signal to a main controller in a top cabin (6) through an armored cable (4), a driving unit (18) starts and releases a probe rod (II), the probe rod (II) is inserted into the seabed in a free falling mode in seawater by means of self gravity, one part of the probe rod (II) is inserted into the seabed, and the other part of the probe rod (II) is positioned in a water body by utilizing a cone at the bottom of the probe rod (II) and a self-provided grid baffle plate (14), after receiving the bottoming signal, the main controller of the probe rod (II) performs measurement according to a preset period;
7) after the in-situ observation period is finished, the auxiliary ship lifts the observation device through the recovery cable, and at the moment, the bottom-touching switch (I) drives the probe rod (II) through the armored cable to recover the two together;
8) reading the observation data of the memory, establishing a real-time ocean soil resistivity calculation formula by using the step 1, calculating the ocean soil resistivity change process in the whole observation process, then correcting elevation change through the data recorded by the attitude sensor, and performing depth correction through the data recorded by the acceleration sensor to finally obtain the change process of vertical resistivity;
9) determining a seabed boundary layer: the part with the largest resistivity is the resistivity of the seabed, the midpoint between the first maximum value and the last minimum value is the resistivity of the seabed, the upper part of the seabed is the resistivity of the seawater, the part with the smallest resistivity is the unaffected seawater, and the middle part of the resistivity is a seabed boundary layer;
10) repeating the steps 1-9 in different periods, and comparing data in different measurement periods to obtain the dynamic change process of the submarine boundary layer.
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| CN110065600A (en) * | 2019-04-09 | 2019-07-30 | 中国海洋大学 | One kind is with the fixed high underwater navigation equipment of stream |
| CN110117951A (en) * | 2019-05-15 | 2019-08-13 | 中国海洋大学 | A kind of seabed static(al) perforation device and injection method based on oceanographic observation feeler lever |
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| CN110850479A (en) * | 2019-11-26 | 2020-02-28 | 自然资源部第一海洋研究所 | Three-dimensional resistivity in-situ monitoring probe |
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