CN110749725A - Testing device and testing method for monitoring transportation process of landslide quality on seabed - Google Patents
Testing device and testing method for monitoring transportation process of landslide quality on seabed Download PDFInfo
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Abstract
A testing device and a testing method for monitoring a landslide quality transportation process on the sea bottom belong to the technical field of ocean engineering. Based on the critical shear stress starting condition, an equivalent simulation method is adopted, a testing device for monitoring the transportation of the submarine landslide body to the water environment is provided, and a test method for effectively testing and analyzing the characteristic parameters of the submarine landslide mass transportation process is provided according to the establishment and parameter conversion of an equivalent simulation relation and a test calibration relation. The testing device provided by the invention can monitor the change condition of the submarine landslide mass transportation process in real time, the parameters are convenient to obtain, and the data volume is rich; the test method is full in theory, convenient to popularize and beneficial to landslide hazard evaluation and engineering facility design work in ocean engineering; in addition, the method can be applied to the research of the mass transport characteristics in the process of the submarine landslide motion and the research of the marine geological problems such as submarine sand waves, submarine sediment resuspension and the like.
Description
Technical Field
The invention belongs to the technical field of ocean engineering, and relates to a device and a method for monitoring and analyzing characteristics of a landslide in a laboratory, in particular to a testing device and a testing method for monitoring the transportation process of the landslide quality in the laboratory.
Background
The seabed landslide is a marine soil disaster which frequently occurs, has wide affected area and is difficult to predict, is represented by local or large-scale sliding of seabed soil, and is one of important geological processes of seabed sediment migration. After the sea landslide slides under the triggering of factors such as earthquake, hydrate decomposition and wave, the sea landslide often shows a staged evolution characteristic under the complex action of a water environment, and the characteristic comprises the following steps: slope instability, block slippage, debris flow slippage, turbidity flow and the like, and the formed landslide body generally has the characteristics of large volume, high speed, long slip distance, strong impact force and the like, and has strong destructive effects on ocean engineering facilities such as ocean platform foundations, submarine energy pipelines, cables, optical cables and the like, for example: in 3 months 1977, a submarine oil pipeline of Texaco corporation in the United states is damaged due to submarine landslide impact, resulting in large amount of crude oil leakage; in 2006, landslides caused the breaking of the lusong strait submarine cables, interrupting communications between china and southeast asia countries for up to 12 hours. Therefore, the analysis of the motion evolution characteristics of the submarine landslide is of great significance to landslide hazard evaluation and engineering facility design.
At present, the phenomena of turbidity current generation in the process of submarine landslide motion and the reason of evolution from solid slide block to turbidity current motion are mainly due to the difference between the densities of submarine landslide body and water environment, mass transfer will occur at the contact interface of the landslide body and the water environment, and the process is generally called mass transport. However, the device is not suitable for use in a kitchenHow to quantitatively analyze the mass transportation process in the process of the submarine landslide movement and give a key characteristic parameter (namely mass transportation flux which represents the mass transportation volume per unit time and unit area, kg/m) in the process2S), there is no reliable testing device and testing method, which is not favorable for the evaluation of the landslide hazard in the ocean engineering and the development of engineering facility design in the region where the landslide is likely to occur.
Disclosure of Invention
Aiming at the current situation that a device and a method for effectively analyzing the transportation process of the landslide mass at the bottom of the sea are lacked at present, the invention provides a device and a method for monitoring and analyzing the landslide characteristic in a laboratory, and firstly, a testing device for monitoring the transportation of the landslide mass at the bottom of the sea to the water environment is provided based on the critical shear stress starting condition and by adopting an equivalent simulation method; then, determining an equivalent simulation relation, and calibrating test parameters; and finally, the testing device is used for carrying out a test, and a testing method for effectively testing and analyzing the characteristic parameters of the landslide quality transportation process is provided according to the establishment of the equivalence simulation relation and the test calibration relation and the parameter conversion. The method is particularly suitable for monitoring and analyzing the transportation process of the landslide mass on the seabed.
In order to achieve the purpose, the invention adopts the technical scheme that:
a testing device for monitoring the transportation process of landslide quality on the sea bottom comprises a power water supply part, a water environment part, a testing part and other auxiliary parts.
The power water supply part is used for realizing a water flow constant-current speed regulation function and comprises a water storage tank 1, a variable-frequency water pump 2, a pipeline 4 and a nozzle 5, wherein the variable-frequency water pump 2 is arranged inside the water storage tank 1, one end of the pipeline 4 penetrates through the side surface of the water storage tank 1 to be connected with the variable-frequency water pump 2, the other end of the pipeline is connected with the nozzle 5, and a water inlet valve port 3 is arranged on the pipeline 4.
The water environment part comprises an environment water tank 7 and a U-shaped groove 8. The environment water tank 7 is integrally arranged at the upper part of the water collecting tank 15, and the water collecting tank 15 is used for collecting turbid fluid flowing out of the water outlet valve 14. The bottom of the environmental water tank 7 is provided with a water outlet valve 14; a bracket 13 is arranged inside the environmental water tank 7. The U-shaped groove 8 is integrally arranged on a bracket 13 in the environmental water tank 7, a layer of simulated sea bed surface 11 is paved at the bottom of the U-shaped groove 8, and the sea bed surface 11 is made of rough materials; a test soil sample 10 and a nozzle 5 are placed in the U-shaped groove 8.
The testing part comprises a flowmeter 6, a soil body resistivity measuring device 9 and a camera 12, the core component of the testing part is the soil body resistivity measuring device 9, and the testing part has the power supply and current monitoring functions and is used for monitoring the quality change condition of a testing soil sample in the testing process in real time. The flowmeter 6 is arranged on the variable frequency water pump 2 and the pipeline 4 of the nozzle 5, and the soil body resistivity measuring device 9 is inserted into the test soil sample 10 from the side surface; the camera 12 is arranged at the positions of the nozzle 5 and the test soil sample 10.
The other auxiliary parts comprise a water collecting tank 15, a computer, a bracket 13 and a simulated seabed surface 11.
Further, the power of the variable frequency water pump 2 is 18-180W, ten-stage variable frequency control is performed, the maximum flow is 15000L/h, and the maximum lift is 7 m; under the control of the variable frequency water pump 2, the power water supply part corresponds to the water velocity range: 1.16-2.05 m/s.
Furthermore, the flowmeter 6 adopts an ultrasonic flowmeter and is applicable to a flow velocity measurement range of +/-0.01 m/s- +/-25 m/s.
Furthermore, the image resolution of the camera is 1920 multiplied by 1080, the imaging rate is 30 frames/second, and waterproof treatment is carried out.
Furthermore, the resistivity measuring device 9 establishes a connection with the change of the mass of the soil body through the change of the resistance difference presented by the soil body in the applied electric field; the two-phase electrode method is adopted for double-probe penetration test, the size of the probe type penetration test probe is 0.02m (length) multiplied by 0.00125m (diameter), the electrode spacing is 0.0185m, a digital source meter is adopted for the current test part of the device, the minimum current test precision is about 1pA, and the device also provides a power supply function.
A test method for monitoring the transportation process of the quality of the landslide on the seabed based on the test device is realized, the test method is based on the critical shear stress starting condition, an equivalent simulation method is adopted, the test device is relied on, and effective test and analysis of the characteristic parameters of the transportation process of the quality of the landslide on the seabed can be realized according to the establishment of an equivalent simulation relation and a test calibration relation and parameter conversion, and the test method comprises the following steps: the method comprises the steps of determining an equivalent simulation relation and a test calibration relation before a test, preparing and laying a test soil sample in the test, preparing and starting a testing device, monitoring and recording a quality transportation process, sorting monitoring data after the test, obtaining a quality transportation flux parameter, and applying the parameters to related research and engineering design, wherein the method specifically comprises the following steps:
(1) before the test, an equivalence simulation relation and a test calibration relation need to be determined, wherein the equivalence simulation relation refers to the relation between target analysis parameters before and after an equivalence simulation method is used, for the submarine landslide mass transportation process aimed by the invention, the target analysis parameters are mass transportation flux at a soil-water contact interface of a submarine landslide body, so that the determined equivalence simulation relation is the relation between the mass transportation flux parameters before and after the equivalence simulation, the determination process adopts a numerical method to give speed field and shear stress field results at the soil-water contact interface before and after the equivalence simulation, and then the quantification relation before and after the equivalence simulation can be determined according to the critical shear stress starting condition generated in the mass transportation process; the test calibration relation is the relation between the soil body resistivity test result and the mass transport flux parameter in the test, and the conversion relation between the soil body resistivity test result and the mass transport flux parameter is calibrated by adopting the soil body resistivity measuring device 9.
(2) After the test is started, firstly, preparing and laying a test soil sample, wherein the main requirement of preparing the test soil sample 10 is to prepare a uniform and repeatable soil sample which accords with the characteristics of typical ocean soil and lay the soil sample in a U-shaped groove 8; then, carrying out test device preparation and starting; finally, the quality transportation process is monitored and recorded through the testing part. Wherein, the preparation and starting process of the test device is as follows:
firstly, closing a water inlet valve port 3 tightly, and filling water into a water storage tank 1; laying a test soil sample 10 in a U-shaped groove 8; the soil body resistivity measuring device 9 is inserted into the side face of the test soil sample 10, a probe type soil penetration test probe and an accurate current recording component are adopted in the device, and the soil body resistivity measuring device 9 is started to enter a power supply and current monitoring working state.
Secondly, the water outlet valve 14 is closed tightly, and water is filled into the environmental water tank 7, so that the test soil sample 10 is completely in the water environment; then, starting the variable frequency water pump 2 to a target flow speed gear, wherein under the condition of each gear, the working frequency of the variable frequency water pump 2 is stable, water in the water storage tank 1 flows through the pipeline 4 at a certain constant flow speed, is sprayed out from the nozzle 5 and acts on the test soil sample 10, wherein the flow speed of the water flow is monitored in real time by the flowmeter 6, and the water outlet valve 14 is opened; along with the continuous shearing action of water flow, the mass transportation process at the contact interface of the test soil sample 10 and the water gradually starts to form particle suspension turbidity current, and the process can be subjected to image monitoring by a camera 12, wherein the camera has a waterproof function; and stopping the test until the soil sample in the electric field range formed by the soil body resistivity measuring device 9 is completely lost (namely the current is not changed any more).
And finally, sorting various results recorded by the flowmeter 6, the soil body resistivity measuring device 9 and the camera 12, after the water sample in the water collecting tank 15 is completely precipitated, injecting the water sample into the water storage tank 1 again, recycling water resources and carrying out the next group of tests.
(3) After the test is finished, monitoring data are collated, the soil body resistivity test result after the equivalent simulation obtained through monitoring is converted into a prototype result according to the equivalent simulation relation and the test calibration relation determined before the test, and the mass transport flux parameter is obtained and can be applied to relevant research and engineering design.
The equivalent simulation method is to equivalently simulate the motion process of the dynamic seabed landslide body in the static water environment in a real state into the change process of the static landslide body under the action of dynamic water flow. Based on the critical shear stress starting condition generated in the mass transportation process (namely once the water flow shear stress at the contact interface of the seabed landslide body and the water environment is greater than the critical shear stress of the marine soil body material, soil particles at the soil-water contact interface of the seabed landslide body enter water to form suspended turbidity current), the mass transportation characteristics at the soil-water contact interface are equivalent.
The equivalent simulation relation is determined by adopting a computational fluid dynamics numerical method, the method is suitable for multiphase flow simulation analysis, and the computational software can be current commercial computational fluid dynamics numerical software (such as ANSYS-CFX software). The method gives the results of the velocity field and the shear stress field at the soil-water contact interface before and after the equivalent simulation, and then can determine the quantitative relation before and after the equivalent simulation according to the critical shear stress starting condition generated in the mass transportation process.
The method is used for determining the calibration relation of the test, and aims to convert the soil resistivity test result and the mass transport flux parameter in the test. Before the test starts, a soil body resistivity measuring device is needed to calibrate the conversion relation between the soil body resistivity measuring device and the soil body resistivity measuring device, and similar calibration tests are commonly used in laboratory test research.
The invention has the beneficial effects that: the testing device can monitor the change condition of the submarine landslide mass transportation process with different flow speed conditions and different properties in real time, the parameters are convenient to obtain, and the data volume is rich; the testing method is full in theory and convenient to popularize, on the basis of the theory of the critical shear stress starting condition, an equivalent simulation method is adopted, the testing device is relied on, and effective testing and analysis of characteristic parameters of the submarine landslide quality transportation process are successfully realized according to establishment and parameter conversion of an equivalent simulation relation and a test calibration relation, so that landslide disaster evaluation and engineering facility design work in ocean engineering are facilitated; in addition, the method can be applied to the research of the mass transport characteristics in the process of the submarine landslide motion and the research of the marine geological problems such as submarine sand waves, submarine sediment resuspension and the like.
Drawings
FIG. 1 is a diagram of a testing apparatus of the present invention;
FIG. 2 is a flow chart of an experimental method of the present invention;
in the figure: 1, a water storage tank; 2, a variable frequency water pump; 3, a water inlet valve port; 4, a pipeline; 5, spraying nozzles; 6, a flow meter; 7 an environmental water tank; 8U-shaped grooves; 9 soil body resistivity measuring device; 10 testing a soil sample; 11 simulating a sea bed surface; 12 a camera; 13 a support; 14 water outlet valve port; 15 water collection tank.
Detailed Description
The following detailed description of the invention refers to the accompanying drawings.
A testing device for monitoring the landslide quality transportation process on the sea bottom is shown in figure 1 and comprises a power water supply part, a water environment part, a testing part and other auxiliary parts, wherein the power water supply part is higher than the water environment part in altitude. The power water supply part is used for realizing a water flow constant-current speed regulation function and comprises a water storage tank 1, a variable-frequency water pump 2, a pipeline 4 and a nozzle 5, wherein the variable-frequency water pump 2 is arranged inside the water storage tank 1, one end of the pipeline 4 penetrates through the side surface of the water storage tank 1 to be connected with the variable-frequency water pump 2, the other end of the pipeline is connected with the nozzle 5, and a water inlet valve port 3 is arranged on the pipeline 4. The water environment part comprises an environment water tank 7 and a U-shaped groove 8. The environment water tank 7 is integrally arranged at the upper part of the water collecting tank 15, and the water collecting tank 15 is used for collecting turbid fluid flowing out of the water outlet valve 14. The bottom of the environmental water tank 7 is provided with a water outlet valve 14; a bracket 13 is arranged inside the environmental water tank 7. The U-shaped groove 8 is integrally arranged on a bracket 13 in the environmental water tank 7, a layer of simulated sea bed surface 11 is paved at the bottom of the U-shaped groove 8, and the sea bed surface 11 is made of rough materials; a test soil sample 10 and a nozzle 5 are placed in the U-shaped groove 8. The testing part comprises a flowmeter 6, a soil body resistivity measuring device 9 and a camera 12, the core component of the testing part is the soil body resistivity measuring device 9, and the testing part has the power supply and current monitoring functions and is used for monitoring the quality change condition of a testing soil sample in the testing process in real time. The flowmeter 6 is arranged on the variable frequency water pump 2 and the pipeline 4 of the nozzle 5, and the soil body resistivity measuring device 9 is inserted into the test soil sample 10 from the side surface; the camera 12 is arranged at the positions of the nozzle 5 and the test soil sample 10. The other auxiliary parts comprise a water collecting tank 15, a computer, a bracket 13 and a simulated seabed surface 11.
The preparation and starting process of the test device comprises the following steps: firstly, closing a water inlet valve port 3 tightly, and filling water into a water storage tank 1; laying a test soil sample 10 in a U-shaped groove 8, wherein the U-shaped groove 8 is integrally arranged on a bracket 1 in an environmental water tank 7, a layer of simulated sea bed surface 11 is laid at the bottom of the U-shaped groove, and the sea bed surface 11 is made of rough materials; the soil body resistivity measuring device 9 is inserted into the side face of the test soil sample 10, and the device adopts a probe type soil penetration test probe and an accurate current recording component to start the soil body resistivity measuring device 9 to enter a power supply and current monitoring working state. Closing the water outlet valve port 13 tightly, and filling water into the environmental water tank 7 to ensure that the test soil sample 10 is completely in the water environment; then, starting the variable frequency water pump 2 to a target flow speed gear, wherein under the condition of each gear, the working frequency of the variable frequency water pump 2 is stable, water in the water storage tank 1 flows through the pipeline 4 at a constant flow speed, is sprayed out from the nozzle 5 and acts on the test soil sample 10, wherein the flow speed of the water flow is monitored in real time by the flowmeter 6, and the water outlet valve 14 is opened; along with the continuous shearing action of water flow, the mass transportation process at the contact interface of the test soil sample 10 and water gradually starts to form particle suspension turbidity current, and the process can be subjected to image monitoring by a camera 12, wherein the camera has a waterproof function; stopping the test until the soil sample in the electric field range formed by the soil resistivity measuring device 9 is completely lost (namely the current is not changed any more); and finally, sorting various results recorded by the flowmeter 6, the soil body resistivity measuring device 9 and the camera 12, after the water sample in the water collecting tank 15 is completely precipitated, injecting the water sample into the water storage tank 1 again, recycling water resources and carrying out the next group of tests.
Furthermore, the size of the water storage tank is 1.4m multiplied by 0.8m, the size of the U-shaped groove is 1.0m multiplied by 0.3m multiplied by 0.2m, and the size of the water environment tank is 1.4m multiplied by 0.7m multiplied by 0.6 m. The resistivity measuring device 9 establishes a connection with the change of the mass of the soil body through the change of the resistance difference presented by the soil body in the applied electric field; the two-phase electrode method is adopted for double-probe penetration test, the size of the probe type penetration test probe is 0.02m (length) multiplied by 0.00125m (diameter), and the electrode spacing is 0.0185 m.
A test method for monitoring the transportation process of the landslide mass on the basis of the test device is shown in figure 2:
(1) before the test, an equivalence simulation relation and a test calibration relation need to be determined, wherein the equivalence simulation relation refers to the relation between target analysis parameters before and after an equivalence simulation method is used, for the submarine landslide mass transportation process aimed by the invention, the target analysis parameters are mass transportation flux at a soil-water contact interface of a submarine landslide body, so that the determined equivalence simulation relation is the relation between the mass transportation flux parameters before and after the equivalence simulation, the determination process adopts a numerical method to give speed field and shear stress field results at the soil-water contact interface before and after the equivalence simulation, and then the quantification relation before and after the equivalence simulation can be determined according to the critical shear stress starting condition generated in the mass transportation process; the test calibration relation is the relation between the soil body resistivity test result and the mass transport flux parameter in the test, and the conversion relation between the soil body resistivity test result and the mass transport flux parameter is calibrated by adopting the soil body resistivity measuring device 9.
(2) After the test is started, firstly, preparing and laying a test soil sample, wherein the main requirement of preparing the test soil sample 10 is to prepare a uniform and repeatable soil sample which accords with the characteristics of typical ocean soil and lay the soil sample in a U-shaped groove 8; then, the test device is prepared and started, and the specific implementation process refers to the description of the test device in fig. 1; and finally, monitoring and recording the mass transport process, wherein the monitoring and recording device comprises a flowmeter 6, a soil body resistivity measuring device 9 and a camera 12.
(3) After the test is finished, monitoring data are collated, the soil body resistivity test result after the equivalent simulation obtained through monitoring is converted into a prototype result according to the equivalent simulation relation and the test calibration relation determined before the test, and the mass transport flux parameter is obtained and can be applied to relevant research and engineering design.
The embodiments described above further detail the basic principles, main features and advantageous effects of the present invention. It should be understood that the specific dimensions and configurations of the components of the testing apparatus of fig. 1, the process of determining equivalent simulation parameters and the test calibration relationship in the flow of the testing method of fig. 2, and the like, are all included in the scope of the present invention without departing from the spirit and principles of the present invention.
Claims (5)
1. A testing device for monitoring the transportation process of landslide quality on the sea bottom is characterized by comprising a power water supply part, a water environment part, a testing part and other auxiliary parts;
the power water supply part is used for realizing a water flow constant-current speed regulation function and comprises a water storage tank (1), a variable-frequency water pump (2), a pipeline (4) and a nozzle (5), wherein the variable-frequency water pump (2) is arranged inside the water storage tank (1), one end of the pipeline (4) penetrates through the side surface of the water storage tank (1) and is connected with the variable-frequency water pump (2), the other end of the pipeline (4) is connected with the nozzle (5), and a water inlet valve port (3) is arranged on the pipeline (4;
the water environment part comprises an environment water tank (7) and a U-shaped groove 8; the environment water tank (7) is integrally arranged at the upper part of the water collecting tank (15), and the water collecting tank (15) is used for collecting turbid fluid flowing out of the water outlet valve (14); the bottom of the environmental water tank (7) is provided with a water outlet valve (14); a bracket (13) is arranged inside the environmental water tank (7); the U-shaped groove 8 is integrally arranged on a bracket (13) in the environmental water tank (7), and a layer of simulated seabed surface (11) is paved at the bottom of the U-shaped groove 8; a test soil sample (10) and a nozzle (5) are placed in the U-shaped groove (8);
the testing part comprises a flowmeter (6), a soil body resistivity measuring device (9) and a camera (12), the core component of the testing part is the soil body resistivity measuring device (9), and the testing part has the power supply and current monitoring functions and is used for monitoring the quality change condition of a testing soil sample in the testing process in real time; the flowmeter (6) is arranged on the pipeline (4) of the variable frequency water pump (2) and the nozzle (5), and the soil body resistivity measuring device (9) is inserted into the test soil sample (10) from the side surface; the camera (12) is arranged at the position of the nozzle (5) and the position of the test soil sample (10), and the camera (12) has a waterproof function;
the other auxiliary parts comprise a water collecting tank (15), a computer, a bracket (13) and a simulated seabed surface (11).
2. The testing device for monitoring the sea-bottom landslide mass transportation process according to claim 1, wherein the power of the variable frequency water pump (2) is 18-180W, ten-stage variable frequency control is performed, the maximum flow is 15000L/h, and the maximum lift is 7 m; under the control of the variable frequency water pump (2), the power water supply part corresponds to the water flow speed range: 1.16-2.05 m/s.
3. The testing device for monitoring the sea bed landslide mass transportation process according to claim 1, wherein the flow meter (6) is an ultrasonic flow meter, and is applicable to a flow rate measurement range of ± 0.01m/s to ± 25 m/s.
4. The device for monitoring the sea bed landslide mass transportation process according to claim 1, wherein the resistivity measuring device 9 adopts a two-phase electrode method double-probe penetration test, a probe type penetration test probe is used, the size of the probe type penetration test probe is 0.02m in length, 0.00125m in diameter, the electrode spacing is 0.0185m, a digital source meter is adopted in a current test part of the device, the minimum current test precision is 1pA, and the device also provides a power supply function.
5. A test method for monitoring the submarine landslide mass transportation process based on the test device of any one of claims 1-4, which is characterized in that the test method is based on the critical shear stress starting condition, an equivalent simulation method is adopted, effective test and analysis of characteristic parameters of the submarine landslide mass transportation process can be realized based on the test device and according to establishment and parameter conversion of an equivalent simulation relation and a test calibration relation, and the specific steps are as follows:
(1) before testing, determining an equivalence simulation relation and a test calibration relation;
determining an equivalence simulation relationship, namely the relationship between the mass transport flux parameters before and after equivalence simulation, adopting a numerical method in the determination process, giving speed field and shear stress field results at soil-water contact interfaces before and after equivalence simulation, and determining a quantitative relationship before and after equivalence simulation according to the critical shear stress starting condition generated in the mass transport process; the test calibration relation is the relation between the soil body resistivity test result and the mass transport flux parameter in the test, and the conversion relation between the soil body resistivity test result and the mass transport flux parameter is calibrated by adopting a soil body resistivity measuring device (9);
(2) after the test is started, the test device is prepared and started, and the quality transportation process is monitored and recorded through the test part; the preparation and starting process of the testing device comprises the following steps:
firstly, preparing a closed water inlet valve port (3), and filling water into a water storage tank (1); laying a test soil sample (10) in a U-shaped groove 8; inserting a soil body resistivity measuring device (9) into the side surface of the test soil sample (10), and starting the soil body resistivity measuring device (9) to enter a power supply and current monitoring working state;
secondly, closing a water outlet valve (14), and filling water into the environmental water tank (7) to ensure that the test soil sample (10) is completely in the water environment; then opening a water outlet valve (14), starting the variable frequency water pump (2) to a target flow speed gear, wherein under the condition of each gear, the working frequency of the variable frequency water pump (2) is stable, so that the water in the water storage tank (1) flows through the pipeline (4) at a constant flow speed, is sprayed out from the nozzle (5) and acts on the test soil sample (10), and the flow speed of the water flow is monitored by the flowmeter (6) in real time; along with the continuous shearing action of water flow, the mass transportation process at the contact interface of the test soil sample (10) and the water gradually starts to form particle suspension turbidity current, and the process is subjected to image monitoring by a camera (12); stopping the test until the soil sample in the electric field range formed by the soil body resistivity measuring device (9) is completely lost, namely the current is not changed any more;
finally, various results recorded by the flowmeter (6), the soil body resistivity measuring device (9) and the camera (12) are sorted, after a water sample in the water collecting tank (15) is completely precipitated, the water sample is injected into the water storage tank (1) again, water resources are recycled, and a next group of tests are carried out;
(3) after the test is finished, monitoring data are collated, and the soil body resistivity test result obtained after the equivalent simulation after the monitoring is converted into a prototype result according to the equivalent simulation relation and the test calibration relation determined before the test, so that the quality transport flux parameter is obtained.
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| CN112464580A (en) * | 2020-09-27 | 2021-03-09 | 山东大学 | Sediment transport flux dynamic analysis method based on three-dimensional time sequence in-situ observation device |
| CN113702619A (en) * | 2021-07-26 | 2021-11-26 | 中国电建集团华东勘测设计研究院有限公司 | Three-dimensional wave current harbor basin test-based seabed landslide evaluation method |
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