CN113804503A - Seabed sediment and water body timing sampling system and method - Google Patents
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Abstract
The invention discloses a seabed sediment and water body timing sampling system and a method, wherein the system is based on a modular design idea and specifically comprises a release and recovery module, a sediment collection module, a system control module and a mechanical frame platform module; the method comprises the steps of system parameter configuration, system arrangement, sample collection, system recovery, sample sampling and the like. Compared with the traditional method for sampling the bottom materials of the seabed sediments, the method disclosed by the invention can complete the processes of autonomous sampling, automatic load-throwing floating and the like of the seabed sediments according to the preset parameter configuration, does not depend on the fixed-point operation of a mother ship or the remote control operation of a complex underwater vehicle, and can synchronously obtain the samples of the seabed sediments and the water body samples under the condition of greatly reducing the occupation of an offshore operation ship. The sampling system has low cost, simple distribution and recovery, high operating efficiency and strong expandability, and can realize high-efficiency sampling investigation of a large-scale submarine sediment target area by a plurality of sets of system array distribution modes.
Description
Technical Field
The invention relates to the technical field of marine investigation, in particular to a seabed sediment and water body timing sampling system and method.
Background
The marine sediment is a general term of the submarine sediment formed by various marine sedimentation effects, and the sampling and research of the deep sea sediment and the samples of the surrounding water bodies have extremely important significance on marine geology, marine biology, ancient climatology and the like. At present, tools commonly used for sampling seabed sediment deposits comprise geological trawls, television grab buckets, columnar samplers, seabed drilling rigs and the like; the seawater body sampling tool is mainly equipment which is carried by various types of ships or needs to be carried on a submersible vehicle for operation. The substrate and water body sampling equipment basically has the characteristics of large volume, heavy weight, high cost and high deployment requirement, a steel cable needs to be connected in the whole process during offshore sampling operation, and deployment and recovery operations are carried out by means of an A-shaped frame and a winch system on an investigation ship. In the oceanic survey task currently carried out in China, sampling operation areas are generally located in remote sea areas such as the southwest Indian ocean, the Atlantic ocean, the Pacific ocean and the like far away from the continental region, and the sampling of sediment deposits on the seabed of the deep ocean is a very expensive research and investigation activity. Furthermore, when a multi-site sampling task is performed in a large-scale submarine sediment target area, a parallel operation mode of distribution and recovery between sites cannot be realized by using a single survey vessel, and thus a large amount of expensive vessel time is required to complete the entire sampling task.
Disclosure of Invention
The invention provides a system and a method for sampling seabed sediment and a water body at regular time, aiming at the problems of high sampling cost, large distribution difficulty, more ship occupation and the like of the seabed sediment.
In order to achieve the above objects, in one aspect, the present invention provides a seabed sediment and water body timing sampling system, which is based on a modular design concept and specifically comprises a release and recovery module, a sediment collection module, a system control module and a mechanical frame platform module; the releasing and recovering module comprises a buoyancy unit, a timing releaser, a weight carrier and a satellite positioning beacon; the buoyancy unit and the satellite positioning beacon are installed at the top of the mechanical frame platform module, the timing releaser is installed at the bottom of the mechanical frame platform module, and the load-carrying block is connected to the timing releaser; the utility model discloses a system for the recovery of water surface, including mechanical frame platform module, sediment collection module, sampling pipe, sediment collection module, sample suction gear pump, system control module, time setting piece disconnection, under the effect of buoyancy unit, the system come-up to the sea, surface of water position information when retrieving is obtained through satellite positioning beacon.
Further, the buoyancy unit is used for providing positive buoyancy of the system; the weight loading block is detachably connected with the releaser through a Kevlar rope and is used for providing the gravity of the system sinking.
Further, the substrate collecting module comprises a metal sampling pipe, a plastic hose, a solid deposit collecting box, a piston quantitative sampling cavity and a sample sucking gear pump; the tail end of the metal sampling pipe is arc-shaped, is used for supporting the balance of a system and can be inserted into a submarine sediment covering layer; the solid sediment collecting box is used for storing sediment samples which are sucked by the sampling system and meet the requirement of particle size; the piston quantitative sampling cavity is used for storing a water body sample sucked by the system; the sample suction gear pump is used for sucking a mixture of solid sediments and a water body sample, the sucked mixture firstly passes through the solid sediment collecting box, sediment samples with certain grain sizes are left after filtration, and the left water body sample is conveyed into the piston quantitative sampling cavity; the plastic hose is used for interconnecting the sample suction gear pump with the metal sampling pipe, the solid deposit collection box and the piston quantitative sampling cavity and transmitting samples.
Furthermore, the system control module comprises a pump valve oil filling cavity, a control circuit board and a lithium battery; the control circuit board, the lithium battery and the sample sucking gear pump are all arranged in the pump valve oil filling cavity; the pump valve oil filling cavity is connected with a control computer through an external watertight connector and is used for acquiring or setting system parameters configured by a user; the control circuit board is used for controlling the operation of the sample suction gear pump motor; the lithium battery is used for providing energy for the system control module and the sample to absorb the operation of the gear pump motor.
Further, the machine frame platform module comprises an aluminum alloy main body frame and a top hanging ring; the aluminum alloy main body frame is used for fixing all parts of other modules in the integrated sampling system and reserving space for further carrying other external sensors so as to improve the expansibility of the sampling system; the top hanging ring is used for providing hanging point support when the sampling system is arranged and recovered.
Furthermore, in the actual use process, the releasing and recovering module is additionally provided with a signal flag and a deepwater pressure-resistant cursor and is matched with a satellite positioning beacon for use, so that the all-weather recovery success rate of the sampling system is further improved.
Furthermore, a filter screen cover is arranged at the orifice of the metal sampling pipe of the substrate collecting module; and double circles of qualitative filter paper are placed in the solid sediment collecting box of the substrate collecting module and are used for obtaining sediment samples meeting the particle size requirement.
On the other hand, the invention also provides a method for sampling the seabed sediment and the water body at regular time, which comprises the following steps:
(1) and (3) system parameter configuration: calculating and setting the starting time T of the sample suction gear pump according to the total mass of the sampling system and the buoyancy parameter of the buoyancy unitsAnd an operating time TwReleasing delay time T of timing releaserrAnd the weight of the load weight required;
(2) system laying: after the parameter configuration of the sampling system is checked to be correct, starting a satellite positioning beacon, connecting a shipboard crane with a lifting ring at the top of the system, lifting the shipboard crane away from a deck, and putting the shipboard crane in contact with the sea surface at the bottom of the sampling system to ensure that the shipboard crane enters water at a normal posture;
(3) collecting samples: the sampling system absorbs seabed solid sediment and an overlying seawater sample according to the configuration parameters, stores the sediment sample meeting the particle size requirement in a solid sediment collection box, and stores the overlying seawater sample in a piston quantitative sampling cavity;
(4) and (3) system recovery: timed release upon reaching a set releaseDelay time TrWhen the sampling system is in use, the sampling system is automatically disconnected with the load-bearing block, and the load-bearing block is released, so that the sampling system automatically floats upwards under the action of the buoyancy unit by positive buoyancy; when the sampling system floats out of the water surface, the carried satellite positioning beacon sends the position information of the sampling system to the ship-based handheld receiving unit; searching and recovering a sampling system according to the position information;
(5) sampling a sample: closing the timed releaser; opening the solid deposit collection box and taking a deposit sample from the filter paper; opening a piston quantitative sampling cavity and taking out a water body sample; and cleaning the solid sediment collection box, the piston quantitative sampling cavity, the metal sampling pipe and the plastic hose with fresh water.
Further, the step (1) specifically comprises the following steps:
(1-1) if the gravity of the sampling system without the weight block in water is G, the buoyancy unit of the sampling system adopts a floating ball, the buoyancy of the floating ball is F, the total underwater gravity of the sampling system is equal to the net buoyancy of the sampling system, and the number N of the weight blocks corresponding to the sampling system is calculated according to the following formulazk：
Wherein G iszkRepresenting the corresponding gravity of the single weight carrier;
(1-2) setting the depth of water in the working sea area to be D, and the total gravity to be G when the sampling system comprises a weight block′Estimating and obtaining the time T required by the sampling system to sink from the sea surface to the sea bottom according to the following formula1：
Wherein rho represents the seawater density value of the working sea area, and S represents the surface area of the floating ball; estimating and obtaining the time T required by the sampling system to float from the seabed to the sea surface according to the following formula2：
Wherein, F′Representing the net buoyancy of the sampling system;
(1-3) to ensure that the sample sucking gear pump starts to operate after the sampling system is completely inserted into the seabed sediment covering layer, the start time T of the sample sucking gear pumpsThe values of (A) are set as follows:
Ts＝T1+T3+τ，
wherein T is3Representing the estimated time of the sampling system from the deck to the actual water distribution; tau represents the time allowance and takes the value of 10-30 minutes;
(1-4) selecting sample suction gear pump running time T according to actual seabed sediment sample suction requirementwThe value is 30-60 minutes, and the starting time T of the gear pump is set respectivelysAnd an operating time Tw。
(1-5) in order to ensure that the sampling system starts to release the weight loading block and float after the sample suction gear pump finishes working, the timing releaser delays the time TrThe values of (A) are set as follows:
Tr＝Ts+Tw+τ
(1-6) detecting the working voltage state of the releaser and setting the delay time T of the timed releaserr。
The invention has the beneficial effects that:
(1) by adopting the modularized design idea, the sampling system has small integral volume, light weight, low cost, simple arrangement and recovery mode and high operation efficiency, and can be further integrated with a self-contained sensor to carry out synchronous water body observation;
(2) the configurable time parameters are adopted to freely control the working time of the system for absorbing the sample and the load throwing and floating time, so that the flexibility of the system in the operation process is improved;
(3) the weight of the weight bearing block can be adjusted in advance according to the bottom material condition of the seabed sediment in the working area, so that the adaptability of the system to different seabed bottom materials is improved;
(4) the sampling operation on the seabed sediments and the overlying seawater is supported, so that the diversity and the integrity of the sucked samples are improved;
(5) the high-efficiency sampling investigation of a large-scale submarine sediment target area can be realized by a plurality of sets of system array arrangement modes.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the system of the present invention.
FIG. 2 is a flow chart of the method of the present invention.
In fig. 1: the device comprises a top lifting ring 1, an aluminum alloy main body frame 2, a plastic hose 3, a piston quantitative sampling cavity 4, a sampling pipe 5, a weight loading block 6, a timing releaser 7, a sample sucking gear pump 8, a pump valve oil filling cavity 9, a solid deposit collecting box 10, a buoyancy unit 11 and a satellite positioning beacon 12.
Detailed Description
In order to more specifically describe the present invention, the following detailed description is provided for the technical solution of the present invention with reference to the accompanying drawings and the specific embodiments.
The embodiment of the invention provides a system and a method for sampling seabed sediment and a water body at fixed time.
In a first aspect of the invention, a seafloor sediment and water body timing sampling system is provided.
As shown in fig. 1, the system is based on a modular design concept, including a release recovery module, a substrate collection module, a system control module, and a mechanical frame platform module;
the releasing and recovering module comprises a buoyancy unit 11, a timing releaser 7, a load-carrying block 6 and a satellite positioning beacon 12; the buoyancy unit 11 is used for providing positive buoyancy of the system; the buoyancy unit 11 and the satellite positioning beacon 12 are installed at the top of the mechanical frame platform module, the timing releaser 7 is installed at the bottom of the mechanical frame platform module, and the load-bearing block 6 is detachably connected with the timing releaser 7 through a Kevlar rope and used for providing the gravity for sinking the system; the timing releaser 7 is disconnected with the load-bearing block after the set time is reached, so that the system meets the upper condition; the satellite positioning beacon 12 is started when the system is deployed and is used for providing water surface position information when the system is recovered; and a signal flag and a deepwater pressure-resistant cursor are additionally arranged and are matched with the satellite positioning beacon 12 for use, so that the all-weather recovery success rate of the sampling system is further improved.
The bottom material collecting module is arranged on the mechanical frame platform module and comprises a metal sampling pipe 5, a plastic hose 3, a solid sediment collecting box 10, a piston quantitative sampling cavity 4 and a sample sucking gear pump 8; the number of the metal sampling pipes 5 is four to eight, the tail ends of the metal sampling pipes are in an arc shape, and the metal sampling pipes are used for supporting the balance of a system and can be inserted into a submarine sediment covering layer; the solid sediment collecting box 10 is used for storing sediment samples which are sucked by the sampling system and meet the requirement of particle size; the piston quantitative sampling cavity 4 is used for storing a water body sample sucked by the system; the sample suction gear pump 8 is used for sucking a mixture of solid sediments and a water body sample, the sucked mixture firstly passes through the solid sediment collecting box 10, sediment samples with certain grain sizes are left after filtration, and the left water body sample is conveyed into the piston quantitative sampling cavity 4; the plastic hose 3 is used for interconnecting the sample suction gear pump 8 with the metal sampling pipe 5, the solid deposit collection box 10 and the piston quantitative sampling cavity 4 and transmitting the sample.
The system control module is arranged on the mechanical frame platform module and comprises a pump valve oil filling cavity 9, and a suction gear pump 8, a related control circuit board, a lithium battery and other components are arranged in the pump valve oil filling cavity; the control circuit board, the lithium battery and the sample sucking gear pump are all arranged in the pump valve oil filling cavity; the pump valve oil filling cavity 9 is connected with a control computer through an external watertight connector and is used for acquiring or setting system parameters configured by a user. The control circuit board is used for controlling the operation of the motor of the sample suction gear pump 8; the lithium battery is used for providing energy for the system control module and the sample to absorb the operation of the motor of the gear pump 8.
The mechanical frame platform module comprises an aluminum alloy main body frame 2 and a top hanging ring 1; the aluminum alloy main body frame 2 is used for fixedly integrating all parts of other modules in the sampling system and reserving space for further carrying other external sensors so as to improve the expansibility of the sampling system; the top hoisting ring 1 is used for providing hoisting point support when the sampling system is arranged and recovered.
A filter screen cover with a proper aperture is selected at the orifice of the metal sampling pipe 5 in the substrate collection module to prevent hard objects such as broken stones and the like from being sucked into the metal sampling pipe when the suction gear pump works; the solid sediment collection box 10 is filled with double-circle qualitative filter paper for obtaining sediment solid particle samples with the particle size being more than or equal to 50 um.
In a second aspect of the present invention, a method for sampling seabed sediment and water body at regular time is provided, as shown in fig. 2, which specifically includes the following steps:
step 1: system parameter configuration
(1-1) the weight of the sampling system without the weight loading blocks in water is 20kg, the buoyancy unit of the sampling system adopts a floating ball, the buoyancy of the floating ball is 25kg, the corresponding weight of a single weight loading block is 2kg, and the number of the load loading blocks corresponding to the sampling system can be calculated to be 5 according to the following formula.
Wherein G iszkRepresenting the corresponding gravity of the single weight carrier; when the hardness of the submarine sediment in the working sea area is high and the viscosity is low, the number of the load blocks configured by the sampling system needs to be increased properly on the basis number, otherwise, the number of the load blocks of the basis is still kept unchanged; g is the gravity of the sampling system without the weight loading block in water, and F is the buoyancy of the buoyancy unit of the sampling system; n is a radical ofzkThe number of the loading blocks.
(1-2) the depth value of the working sea area is 2000 m, the total gravity is 30kg when the sampling system comprises a weight block, the diameter of a floating ball is 530mm, and the time required for the sampling system to sink from the sea surface to the seabed is estimated to be 75 minutes according to the following formula;
wherein rho represents the seawater density value of the working sea area, and S represents the surface area of the floating ball; d is the depth of water in the working sea area, G′Estimating the total gravity when the sampling system contains the weight loading block according to the following formula to obtain the time T required by the sampling system to float from the seabed to the sea surface2Also 75 minutes:
wherein F' represents the net buoyancy of the sampling system;
(1-3) the estimated time of the sampling system from the deck to the actual water distribution is 20 minutes, and in order to ensure that the suction gear pump starts to work after the sampling system is completely inserted into the seabed sediment covering layer, the starting time T of the suction gear pump is calculated according to the following formulasMay be set to 110 minutes.
Ts＝T1+T3+τ，
Wherein T is3Representing the estimated time of the sampling system from the deck to the actual water distribution; tau represents the time allowance and takes the value of 10-30 minutes;
(1-4) selecting the operating time of the gear pump for absorption for 30 minutes, connecting the control computer with the control cabin through a data line from a USB to an RS485 serial port, and respectively setting the starting time and the operating time of the gear pump.
(1-5) in order to ensure that the sampling system starts to release the weight loading block and float after the sample sucking gear pump finishes working, the delay time of the timing releaser is set to be 120 minutes according to the following formula.
Tr＝Ts+Tw+τ
Wherein, TsFor gear pump start-up time, TwGear pump run time.
(1-6) rotating a switch of the timing releaser to an ON state, connecting a control computer with the timing releaser through a USB-to-RS 485 serial port data line, detecting the working voltage state of the timing releaser by using releaser special software, and setting the delay time of the timing releaser.
Step 2: system laying:
and after the parameter configuration of the sampling system is checked to be correct, starting a satellite positioning beacon, connecting a shipboard crane with a lifting ring at the top of the system, lifting the shipboard crane away from a deck, and putting the shipboard crane in contact with the sea surface at the bottom of the sampling system to ensure that the shipboard crane enters water in a normal posture.
And step 3: collecting samples:
the sample suction gear pump is started when the set starting time is up, the sampling system starts to suck the seabed sediment and the overlying seawater sample, wherein the sediment sample meeting the particle size requirement is stored in the solid sediment collecting box, and the overlying seawater sample is stored in the piston quantitative sampling cavity; the sample suction gear pump is closed after the operation time, and the sampling system stops sucking the seabed sediment and the overlying seawater sample.
And 4, step 4: and (3) system recovery:
when the set release delay time is reached, the timing releaser automatically rotates to a release state and then abandons the weight loading block, so that the sampling system automatically floats upwards by positive buoyancy; when the sampling system floats out of the water surface, the carried satellite positioning beacon sends the position information of the sampling system to the ship-based handheld receiving unit; and searching and recovering the sampling system according to the position information.
And 5: sampling a sample:
turning OFF the timed releaser switch to an OFF state; opening the solid deposit collection box and taking a deposit sample from the filter paper; opening a piston quantitative sampling cavity and taking out a water body sample; and cleaning the solid sediment collection box, the piston quantitative sampling cavity, the metal sampling pipe and the plastic hose with fresh water.
The above-mentioned embodiments are intended to illustrate the technical solutions and advantages of the present invention, and it should be understood that the above-mentioned embodiments are only the most preferred embodiments of the present invention, and are not intended to limit the present invention, and any modifications, additions, equivalents and improvements made within the scope of the principles of the present invention should be included in the scope of the present invention.
Claims (9)
1. A seabed sediment and water body timing sampling system is characterized in that the system is based on a modular design idea and specifically comprises a release and recovery module, a sediment collection module, a system control module and a mechanical frame platform module; the releasing and recovering module comprises a buoyancy unit, a timing releaser, a weight carrier and a satellite positioning beacon; the buoyancy unit and the satellite positioning beacon are installed at the top of the mechanical frame platform module, the timing releaser is installed at the bottom of the mechanical frame platform module, and the load-carrying block is connected to the timing releaser; the utility model discloses a system for the recovery of water surface, including mechanical frame platform module, sediment collection module, sampling pipe, sediment collection module, sample suction gear pump, system control module, time setting piece disconnection, under the effect of buoyancy unit, the system come-up to the sea, surface of water position information when retrieving is obtained through satellite positioning beacon.
2. The seafloor sediment and water body timed sampling system of claim 1, wherein the buoyancy unit is used to provide positive buoyancy to the system; the weight loading block is detachably connected with the releaser through a Kevlar rope and is used for providing the gravity of the system sinking.
3. The timed seafloor sediment and water sampling system of claim 1, wherein the sediment collection module comprises a metal sampling tube, a plastic hose, a solid sediment collection box, a piston quantitative sampling cavity, and a sample suction gear pump; the tail end of the metal sampling pipe is arc-shaped, is used for supporting the balance of a system and can be inserted into a submarine sediment covering layer; the solid sediment collecting box is used for storing sediment samples which are sucked by the sampling system and meet the requirement of particle size; the piston quantitative sampling cavity is used for storing a water body sample sucked by the system; the sample suction gear pump is used for sucking a mixture of solid sediments and a water body sample, the sucked mixture firstly passes through the solid sediment collecting box, sediment samples with certain grain sizes are left after filtration, and the left water body sample is conveyed into the piston quantitative sampling cavity; the plastic hose is used for interconnecting the sample suction gear pump with the metal sampling pipe, the solid deposit collection box and the piston quantitative sampling cavity and transmitting samples.
4. The timed seabed sediment and water body sampling system as claimed in claim 1, wherein the system control module comprises a pump valve oil filling cavity, a control circuit board and a lithium battery; the control circuit board, the lithium battery and the sample sucking gear pump are all arranged in the pump valve oil filling cavity; the pump valve oil filling cavity is connected with a control computer through an external watertight connector and is used for acquiring or setting system parameters configured by a user; the control circuit board is used for controlling the operation of the sample suction gear pump motor; the lithium battery is used for providing energy for the system control module and the sample to absorb the operation of the gear pump motor.
5. The seafloor sediment and water body timed sampling system of claim 1, wherein the mechanical frame platform module comprises an aluminum alloy main body frame and a top sling; the aluminum alloy main body frame is used for fixing all parts of other modules in the integrated sampling system and reserving space for further carrying other external sensors so as to improve the expansibility of the sampling system; the top hanging ring is used for providing hanging point support when the sampling system is arranged and recovered.
6. The timed seabed sediment and water body sampling system as claimed in claim 1, wherein the releasing and recovering module is additionally provided with a signal flag and a deepwater pressure-resistant cursor in the actual use process, and is used together with a satellite positioning beacon to further improve the all-weather recovering success rate of the sampling system.
7. The timed seabed sediment and water body sampling system as claimed in claim 1, wherein the orifice of the metal sampling pipe of the sediment collection module is provided with a filter screen cover; and double circles of qualitative filter paper are placed in the solid sediment collecting box of the substrate collecting module and are used for obtaining sediment samples meeting the particle size requirement.
8. A method for the timed sampling of seabed sediment and water based on the system of any one of claims 1 to 7, comprising the following steps:
(1) and (3) system parameter configuration: calculating and setting the starting time T of the sample suction gear pump according to the total mass of the sampling system and the buoyancy parameter of the buoyancy unitsAnd an operating time TwReleasing delay time T of timing releaserrAnd the weight of the load weight required;
(2) system laying: after the parameter configuration of the sampling system is checked to be correct, starting a satellite positioning beacon, connecting a shipboard crane with a lifting ring at the top of the system, lifting the shipboard crane away from a deck, and putting the shipboard crane in contact with the sea surface at the bottom of the sampling system to ensure that the shipboard crane enters water at a normal posture;
(3) collecting samples: the sampling system absorbs seabed solid sediment and an overlying seawater sample according to the configuration parameters, stores the sediment sample meeting the particle size requirement in a solid sediment collection box, and stores the overlying seawater sample in a piston quantitative sampling cavity;
(4) and (3) system recovery: the timing releaser reaches the set release delay time TrWhen the sampling system is in use, the sampling system is automatically disconnected with the load-bearing block, and the load-bearing block is released, so that the sampling system automatically floats upwards under the action of the buoyancy unit by positive buoyancy; when the sampling system floats out of the water surface, the carried satellite positioning beacon sends the position information of the sampling system to the ship-based handheld receiving unit; searching and recovering a sampling system according to the position information;
(5) sampling a sample: closing the timed releaser; opening the solid deposit collection box and taking a deposit sample from the filter paper; opening a piston quantitative sampling cavity and taking out a water body sample; and cleaning the solid sediment collection box, the piston quantitative sampling cavity, the metal sampling pipe and the plastic hose with fresh water.
9. The method for timed sampling of seabed sediment and water body according to claim 8, wherein the step (1) comprises the following steps:
(1-1) if the gravity of the sampling system without the weight block in water is G, the buoyancy unit of the sampling system adopts a floating ball, the buoyancy of the floating ball is F, the total underwater gravity of the sampling system is equal to the net buoyancy of the sampling system, and the number N of the weight blocks corresponding to the sampling system is calculated according to the following formulazk：
Wherein G iszkRepresenting the corresponding gravity of the single weight carrier;
(1-2) setting the depth of the working sea area as D and the total gravity of the sampling system containing the weight block as G', and estimating the time T required for the sampling system to sink from the sea surface to the seabed according to the following formula1：
Wherein rho represents the seawater density value of the working sea area, and S represents the surface area of the floating ball; estimating and obtaining the time T required by the sampling system to float from the seabed to the sea surface according to the following formula2：
Wherein F' represents the net buoyancy of the sampling system;
(1-3) to ensure that the sample sucking gear pump starts to operate after the sampling system is completely inserted into the seabed sediment covering layer, the start time T of the sample sucking gear pumpsThe values of (A) are set as follows:
Ts＝T1+T3+τ，
wherein T is3Representing the estimated time of the sampling system from the deck to the actual water distribution; tau represents the time allowance and takes the value of 10-30 minutes;
(1-4) selecting a sample according to the absorption requirement of the actual sediment sample on the seabedSuction gear pump running time TwThe value is 30-60 minutes, and the starting time T of the gear pump is set respectivelysAnd an operating time Tw。
(1-5) in order to ensure that the sampling system starts to release the weight loading block and float after the sample suction gear pump finishes working, the timing releaser delays the time TrThe values of (A) are set as follows:
Tr＝Ts+Tw+τ
(1-6) detecting the working voltage state of the releaser and setting the delay time T of the timed releaserr。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN114910299A (en) * | 2022-02-23 | 2022-08-16 | 南方海洋科学与工程广东省实验室(广州) | Deep sea normal position long-term experiment platform with deposit sample function |
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