CN113866384A - Detachable soil column soil water and solute transport testing device and method - Google Patents
Detachable soil column soil water and solute transport testing device and method Download PDFInfo
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
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Abstract
The invention relates to a detachable soil column soil water and solute transport testing device, wherein components and a base of the device are made of organic glass, wherein grooves and convex rings are respectively arranged at the upper end and the lower end of an organic glass cylinder to form a sealing structure between the components; the locking device is a semicircular steel plate, and the two semicircular steel plates are spliced at the joint of the components, so that the stability and the sealing property of the soil column are ensured; soil salinity, moisture and temperature sensors and a soil solution negative pressure sampler are respectively embedded in the soil layers of the components and connected with corresponding collectors and sampling bottles, and the collectors are connected with a computer terminal in a centralized manner to automatically measure and record data; the top assembly and the base are respectively connected with the Mariotte bottle and used for controlling the soil water inflow and the underground water burial depth of the device. The invention monitors the multi-layer soil water and solute migration and transformation process under different types of soil and different combinations of the soil through the detachable and flexibly assembled soil columns, and can provide a test tool and technical support for researching soil water and solute redistribution and leaching loss under different water depth control.
Description
Technical Field
The invention relates to the field of soil water and solute migration, in particular to a device and a method for testing soil water and solute migration of a detachable soil column.
Background
The earth pillar test device is a very effective tool for researching the migration and transformation rules of water and solute in an underground water-soil-crop-atmosphere system, has wide application in the fields of water conservancy, soil, agriculture, environmental protection and the like, and obtains a large number of research achievements in scientific researches such as soil solute migration simulation, soil hydrology property, heavy metal and pollutant migration and transformation and the like.
However, the traditional vertical soil columns are mostly integrated, once the soil columns are built, only fixed soil types can be researched, and when the properties of different types of soil and the internal solute transfer process need to be researched, a plurality of soil columns need to be built, so that the construction cost is high; the integral soil column has large volume, and has the problems of difficult manufacture, inconvenient experimental operation, large occupied area and the like.
Disclosure of Invention
The invention aims to solve the problems and provides a device and a method for testing the migration of soil water and solutes of a detachable soil column. The device can test the migration and transformation process of water and solute between soils under different water layer depths and underground water burial depth combinations, and invert key parameters.
A detachable soil column soil water and solute migration testing device is sequentially provided with a soil column upper assembly (1), a soil column middle assembly (2), a soil column lower assembly (3) and a base (18) from top to bottom, wherein a locking sealing device (4) and a sealing structure are arranged at the joint of the soil column middle assembly (2) and the soil column upper assembly (1), the joint of the soil column middle assembly (2) and the soil column lower assembly (3) and the joint of the soil column lower assembly (3) and the base (18); the base (18) is connected with the glass bottle and the Martensis bottle through hoses and is used for collecting leachate and controlling the buried depth of underground water;
the upper, middle and lower components (1-3) of the earth pillar are composed of an organic glass cylinder and a soil layer filled in the organic glass cylinder, and nylon mesh covers (5) are arranged at the bottoms of the upper component (1) and the middle component (2) of the earth pillar and used for fixing the soil layer, so that the soil layer between the components can be conveniently moved by moisture and solute; scales are arranged on the outer wall of the organic glass cylinder of the assembly (1-3), so that the earth column can be conveniently backfilled in layers and compacted; and a proper amount of sampling holes (6) are reserved on the side wall, the sampling holes are in a circular hole shape, the aperture is 2-3cm, each sampling hole is provided with a water seepage prevention rubber plug, and the sampling holes are blocked by the rubber plugs when not sampling. The soil column lower part assembly (3) comprises a reverse filtering layer (7) and a nylon cloth layer (8) from top to bottom in sequence under a soil layer; the inverted filter layer (7) is 5-10 cm thick and is composed of fine quartz sand, coarse quartz sand and gravel.
The upper end and the lower end of each component organic glass cylinder are respectively cut into an annular groove and a convex ring, and the annular grooves and the convex rings of the components which are adjacent up and down are embedded during assembly; the base (18) and the lower component (3) are sealed in the same way; and sealing rings are arranged in the organic glass cylinder annular grooves of the organic glass cylinder, the components and the base among the components and used for sealing the joints. The joints of all parts are fixed by a locking device (4) with a bolt structure. During the test, the locking sealing device (4) is closed (supplement figure), and all parts of the soil column can be tightly connected; and in the replacement of the components or in the non-test period, the locking sealing device (4) is opened, and the components can be detached and replaced. The locking device (4) is a semicircular steel plate with the inner diameter being 3cm wide and the thickness being 2mm and the inner diameter being consistent with the organic glass cylinder of the earth column assembly, two ends of the steel plate are respectively punched, the inner wall of the steel plate is provided with a rubber ring, and after the earth column assembly is assembled, the two semicircular steel plates are spliced at the assembly joint and are fixed at the joint by flange bolts, so that the stability and the tightness of the earth column are ensured.
The soil layer of the upper component (1) is below 5cm from the top of the upper component, so that a space is reserved for facilitating water supply of the Mariotte bottle during testing; when the water storage space is not enough, an organic glass cylinder can be additionally embedded in the upper part of the water storage space. The soil sample collection device is characterized in that a soil salinity sensor (9), a soil solution negative pressure sampler (10) and a soil moisture temperature measurement sensor (11) which are positioned on the same horizontal plane are respectively arranged in a soil layer, the soil salinity sensor (9) and the soil moisture temperature measurement sensor (11) are connected with a soil salinity collector (12), a soil temperature collector (14) and a soil moisture collector (15) through glass column preformed holes (17) by using conducting wires, and the soil solution negative pressure sampler (10) is connected with a sampling bottle (13) through the glass column preformed holes (17) by using conducting wires; the soil salinity collector (12), the soil temperature collector (14) and the soil moisture collector (15) are integrated in the soil comprehensive data collection box (16), and the soil comprehensive data collection box (16) is connected with a computer terminal to automatically measure and record data.
A detachable soil column soil water and solute transport test method comprises the following steps:
(1) manufacturing soil columns with different soil layer thicknesses and properties according to test requirements, combining the soil columns according to a test scheme, and measuring physicochemical properties such as volume weight, particle size grading, water constant, total nitrogen, total phosphorus, quick-acting nitrogen and the like, and hydrodynamic properties such as hydraulic conductivity, water characteristic curve and the like of each component soil layer in advance;
(2) respectively connecting the upper assembly and the lower assembly with a Mariotte flask, and respectively controlling the test water inlet and the underground water burial depth by adjusting the position of the Mariotte flask; the specific water inflow and rate and the underground water burial depth are determined according to the test requirements;
(3) after the test is started, measuring the soil moisture content, the soil temperature, the soil salinity and the like by a sensor, and transmitting data to a computer terminal for storage; according to test requirements, soil aqueous solution is extracted at regular time through a negative pressure sampling device and sent to a laboratory to detect the content of solutes such as nitrogen, phosphorus and the like, so that the change process and redistribution of soil moisture, temperature, solute content and salinity content in the test process are obtained, and data are provided for statistical analysis and numerical simulation inversion parameters;
(4) after a group of experiments are finished, the target assembly is installed or disassembled according to the experiment requirements, the earth pillar device is formed again, and then a new experiment is started.
The invention relates to a detachable soil column soil water and solute transport testing device and a testing method, which have the advantages that:
(1) aiming at the current situation of layering and transition layers commonly existing in soil in natural environment, the soil column device matched with multiple layers of soil is adopted, and corresponding instruments and sensors are installed and buried, so that a reliable tool is provided for research on migration of moisture and solute of the multiple layers of soil;
(2) through the locking device designed in the invention, the soil columns are installed and manufactured in a detachable and assembled mode, the soil column assemblies with different soil properties can be flexibly matched according to test requirements, and the soil column device with different soil property combinations can be quickly obtained;
(3) the device and the test process can control the soil water supply and the groundwater burial depth in the test process through the connected Mariotte bottle and the valve, quantitatively obtain the infiltration and the exchange water quantity of the groundwater and the soil water, and explore the accompanying solute migration and transformation process and path under the control of different water depths.
Drawings
FIG. 1 is a cross-sectional view and a perspective view of a soil column;
FIG. 2 is a top view of the earth pillar;
FIG. 3 is a schematic view of a sealing structure;
fig. 4 shows a locking device.
Detailed Description
Example one
The invention is further described below with reference to the accompanying drawings. As shown in figures 1-3, a detachable soil column soil water and solute transport testing device is sequentially provided with a soil column upper assembly 1, a middle assembly 2, a lower assembly 3 and a base 18 from top to bottom, wherein the soil column upper assembly, the middle assembly and the lower assembly (1-3) are respectively composed of an organic glass cylinder and a soil layer filled in the organic glass cylinder; the inner diameter and the outer diameter of the upper pipe body, the middle pipe body and the lower pipe body of the earth pillar are the same. The base 18 is also made of plexiglas but has a larger diameter than the tubular body of the earth pillar to ensure its overall stability. And the locking device 4 and the sealing structure are arranged at the joints of the components and the base 18, so that the connection stability and the connection tightness of the components and the base are ensured. Through the opening and closing of the locking device, the required components can be detached, replaced and installed.
The upper pipe body, the middle pipe body and the lower pipe body of the earth pillar are organic glass cylinders with the inner diameter of 30cm, the thickness of each organic glass cylinder is 10mm, the height of the upper pipe body is 30.5cm, and the height of the middle pipe body is 30.5 cm; the height of the lower pipe body is 30 cm. The bottom of the earth pillar lower component 3 is provided with a porous flange 19 which is fixed with the base by bolts. The base 18 is an organic glass cylinder with the same diameter as the soil column, the height of the organic glass cylinder is 10cm, and the upper part and the lower part of the organic glass cylinder are respectively welded with a porous flange 19 and an organic glass plate, the diameters of which are 40 cm. A water guide hose is connected below the porous flange 19, leachate can be introduced into the glass bottle, and a valve 20 is arranged on the water guide hose and used for controlling leaching and drainage; the middle part of the porous flange 19 is provided with a water guide pipe which is connected with a Ma's bottle 21, and the underground water level of the earth pillar device is controlled by the Ma's bottle.
The bottom of earth pillar upper portion subassembly 1, middle part subassembly 2 is provided with nylon screen panel 5 for fixed soil horizon, the migration of moisture and solute takes place for the soil horizon between the subassembly of being convenient for.
The sealing structure is positioned at the joint of the assembly glass cylinders, the inner side and the outer side of one end of each assembly glass cylinder are respectively cut by 2.5mm within the range of 5mm at the two ends of each assembly glass cylinder, a circumferential protruding part with the height of 5mm and the width of 5mm is formed in the middle of each assembly glass cylinder, a circumferential groove with the height of 5mm and the width of 5mm is cut at the other end of each assembly glass cylinder, and the protruding parts of two vertically adjacent earth pillar glass cylinders are attached to the grooves; the base 18 is also provided with a corresponding circumferential groove with the height of 5mm and the width of 5mm, and the circumferential groove is attached to a circumferential protruding part at the lower end of the earth pillar lower component 3 when the bolt is fixed. Sealing rings are arranged in circumferential grooves between the earth pillar component glass cylinders and between the component glass cylinders and the base 18 and are used for sealing and stopping water at joints.
The locking device 4 is a semicircular steel plate with the inner diameter being 3cm wide and the thickness being 2mm and the inner diameter being consistent with the organic glass cylinder of the earth pillar assembly, two ends of the steel plate are respectively punched, the inner wall of the steel plate is provided with a rubber ring, and after the earth pillar assembly is assembled, the two semicircular steel plates are spliced at the assembly joint and fixed at the joint by a flange bolt, so that the stability and the tightness of the earth pillar are ensured.
On detachable earth pillar soil water and solute migration testing arrangement's organic glass section of thick bamboo lateral wall, set up three soil sampling hole respectively in predetermined height, the sampling hole is located same height and evenly arranges around a glass section of thick bamboo a week, and the aperture size of sampling hole is 2 ~ 3cm, and the central angle that the arc length corresponds between two thief hatches is 120.
Soil layer of upper, middle and lower part subassembly on the earth pillar respectively sets up soil salinity sensor 9, soil solution negative pressure sampling ware 10 and the soil moisture temperature measurement sensor 11 that are located same horizontal plane, soil salinity sensor 9, soil moisture temperature measurement sensor 11 utilize the wire to pass through glass post preformed hole 17 and link to each other with soil salinity collector 12 and soil temperature collector 14, soil moisture collector 15, and soil solution negative pressure sampling ware 10 utilizes the wire to pass through glass post preformed hole 17 and sample bottle 13 and link to each other. The soil salinity collector 12, the soil temperature collector 14 and the soil moisture collector 15 are integrated in the soil comprehensive data collection box 16, the soil comprehensive data collection box 16 is connected with a computer terminal, and after the frequency is set, data are automatically collected. The earth pillar is gone up, middle and lower part subassembly and respectively is equipped with three preformed hole 17 and sample connection 6 and is located same horizontal plane, and the central angle that the arc length corresponds between per two preformed holes is 120 and the preformed hole 17 is unanimous with the arc length between two sample connections that close to, and the central angle that the arc length corresponds is 60.
In the earth pillar upper part assembly 1, a circular opening with the diameter of 2cm is formed in the top end of the earth pillar upper part assembly and used for supplying water, the part of 5cm at the top of the earth pillar upper part assembly 1 is empty and used for storing water, and a soil layer is arranged below the earth pillar upper part assembly. The water supply device is a Mariotte bottle.
The earth pillar lower component (3) sequentially comprises a soil layer, a reverse filtering layer 7 and a nylon cloth layer 8 from top to bottom; the inverted filter layer 7 is 5-10 cm thick and consists of fine quartz sand, coarse quartz sand and gravel, and soil particles are prevented from being washed away by water.
The method comprises the following steps:
(1) measuring the physical and chemical properties of the soil layer of each component, such as volume weight, grain size grading, moisture constant, total nitrogen, total phosphorus, quick-acting nitrogen and the like, and the hydrodynamic properties, such as hydraulic conductivity, moisture characteristic curve and the like in advance;
(2) manufacturing soil columns with different soil layer thicknesses and properties according to test requirements, and combining the soil columns according to a test scheme;
(3) respectively connecting the upper assembly and the lower assembly with a Mariotte flask, and respectively controlling the test water inlet and the underground water burial depth by adjusting the position of the Mariotte flask; the specific water inflow and rate and the underground water burial depth are determined according to the test requirements;
(4) after the test is started, measuring the soil moisture content, the soil temperature, the soil salinity and the like by a sensor, and transmitting data to a computer terminal for storage; according to test requirements, soil aqueous solution is extracted at regular time through a negative pressure sampling device and sent to a laboratory to detect the content of solutes such as nitrogen, phosphorus and the like, so that the change process and redistribution of soil moisture, temperature, solute content and salinity content in the test process are obtained, and data are provided for statistical analysis and numerical simulation inversion parameters;
(5) after a group of experiments are finished, the target assembly is installed or disassembled according to the experiment requirements, the earth pillar device is formed again, and then a new experiment is started.
The method monitors the migration and transformation process accompanied by soil water and solute under the combination of soil columns with different soil properties, explores the soil water and solute leaching rule under various water depth control conditions, and provides theoretical basis and technical support for conservation and management of the soil water and the nutrient thereof.
Example two
The application of the device is further explained by combining the characteristics of the soil in the karst area.
As shown in figure 1, the device is composed of a base 18, a reverse filter layer 7, a soil column lower assembly, a middle assembly and an upper assembly (3-1) from bottom to top, wherein the upper assembly and the lower assembly of the soil column are respectively connected with a March's flask, and the test water inlet and the underground water burial depth are respectively controlled by adjusting the position of the March's flask.
According to karst area soil characteristic, device soil horizon divides into eluviation layer (A), sedimentary deposit (B), mother's stratum (C) from top to bottom in proper order, and each layer soil property can set up according to the experiment requirement, and diameter, height all set up to 30 cm. Soil columns are sequentially filled into the soil column (1-3) assemblies, and the part 5cm away from the top of the soil column upper assembly 1 is used for storing water. The earth pillar lower component 3 sequentially comprises a soil layer, a reverse filtering layer 7 and a nylon cloth layer 8 from top to bottom; the reverse filtering layer 7 is composed of fine quartz sand, coarse quartz sand and gravel laid for 5-10 cm, and provides a smooth air flow infiltration environment for the infiltration process.
Soil salinity sensor 9, soil solution negative pressure sampler 10 and soil moisture temperature measuring sensor 11 that are located the coplanar are provided with respectively in each soil layer, and each sensor, sampler utilize respective wire to be connected to each collector, sampling bottle respectively through glass post preformed hole 17. The soil salinity sensors 9 of all layers are located in the same vertical plane, the soil solution negative pressure sampler 10 is located in the same vertical plane, and the soil moisture temperature measuring sensors 11 are located in the same vertical plane.
A sampling port 6 is arranged on the side wall of the detachable soil column soil water and solute migration testing device, so that layered soil sampling is facilitated, scales are arranged on the outer wall of a soil column pipe, and the soil column is conveniently backfilled in layers and compacted.
The lower assembly 3 of the soil column is fixed with the base by bolts. The base 18 is an organic glass cylinder with the same diameter as the earth column, the upper layer is a porous flange 19, the lower layer is a circular organic glass plate, a water guide hose is connected under the porous flange 19, leachate is introduced into the glass bottle, and a valve 20 is arranged on the water guide hose and used for controlling leaching and drainage; the middle part of the porous flange 19 is provided with a water guide pipe which is connected with a Ma's bottle 21, and the underground water level of the earth pillar device is controlled by the Ma's bottle.
The soil salinity collector 12, the soil temperature collector 14 and the soil moisture collector 15 are integrated in a soil data comprehensive collection box 16, and the soil data comprehensive collection box 16 is connected with a computer terminal. And observing the dynamic detection process of the parameters and reading corresponding dynamic change data.
The method comprises the following steps:
(1) manufacturing an upper assembly 1, a middle assembly 2, a lower assembly 3, a tightening device 4 and a base 18 of the soil column, wherein the soil column assembly (1-3) consists of an organic glass cylinder, and a sampling port 6 and a reserved hole 17 which are shown in figure 1 are distributed on the designated height of the organic glass cylinder. The locking device 4 and the sealing structure are arranged at the joint of the assembly and the base 18, and the required assembly can be detached, replaced and installed by opening and closing the locking device;
(2) according to the soil characteristics of a karst area, soil of a soil column is sequentially divided into an eluviation layer (A), a deposition layer (B) and a mother layer (C) from top to bottom, the basic physicochemical properties of the soil are set according to the concrete needs of an experiment, the eluviation layer (A), the deposition layer (B) and the mother layer (C) which are 30cm in diameter and height are respectively manufactured, a certain amount of stones are distributed in the soil of each layer to simulate the soil and stone combination characteristics of the soil layer of the karst area, and the concrete soil and stone proportion is set according to the concrete requirements of the experiment;
(3) soil salinity sensor 9, soil solution negative pressure sampler 10 and soil moisture temperature measuring sensor 11 that are located the coplanar are provided with respectively in each soil layer, and each sensor, sampler utilize respective wire to be connected to each collector, sampling bottle respectively through glass post preformed hole 17. Measuring soil moisture content, soil temperature, soil salinity and the like by a sensor, and transmitting data to a computer terminal for storage; according to test requirements, soil aqueous solution is extracted at regular time through a negative pressure sampling device and sent to a laboratory to detect the content of solutes such as nitrogen, phosphorus and the like, so that the change process and redistribution of soil moisture, temperature, solute content and salinity content in the test process are obtained, and data are provided for statistical analysis and numerical simulation inversion parameters;
(4) the upper layer of the base 18 is a porous flange 19, the lower layer is a circular organic glass plate, a water guide hose is connected under the porous flange 19, leachate is introduced into a glass bottle, and a valve 20 is arranged on the water guide hose and used for controlling leaching and drainage; the middle part of the porous flange 19 is provided with a water guide pipe which is connected with a Ma's bottle 21, and the underground water level of the earth pillar device is controlled by the Ma's bottle;
(5) before the experiment, the volume weight, the grain size grading, the moisture constant, the total nitrogen, the total phosphorus, the quick-acting nitrogen and other physical and chemical properties of the soil layer of each component, the hydraulic conductivity, the moisture characteristic curve and other hydrodynamic properties are measured, and the initial values of various physical and chemical parameters are determined;
(6) respectively connecting the upper assembly and the lower assembly with a Mariotte flask, and respectively controlling the test water inlet and the underground water burial depth by adjusting the position of the Mariotte flask; the specific water inflow and rate and the underground water burial depth are determined according to the test requirements;
(7) and dynamically monitoring soil water content, soil temperature, soil salt and the like in each layer of soil in the process of transporting soil water and solutes according to the sensors buried in each layer of the soil column, simultaneously respectively taking water samples from each layer by using a soil solution negative pressure sampler according to experimental requirements, and measuring according to the specific experimental requirements. And analyzing by combining the observed soil moisture content, soil temperature, soil salt and the like, researching the distribution of soil water and solutes in the soil in the migration process, and further researching the migration and transformation processes of the soil water and the solutes between the layers.
Claims (10)
1. A detachable soil column soil water and solute transport testing device and method are characterized in that: the detachable soil column device is sequentially provided with a soil column upper assembly (1), a soil column middle assembly (2), a soil column lower assembly (3) and a base (18) from top to bottom, and a locking sealing device (4) and a sealing structure are arranged at the joint of the soil column middle assembly (2) and the soil column upper assembly (1), the joint of the soil column middle assembly (2) and the soil column lower assembly (3) and the joint of the soil column lower assembly (3) and the base (18); the upper, middle and lower components (1-3) of the earth pillar are respectively composed of an organic glass cylinder and a soil layer filled in the organic glass cylinder; the inner diameter and the outer diameter of the organic glass cylinder at the upper part, the middle part and the lower part of the soil column are the same.
2. The test apparatus of claim 1, wherein: the bottom of earth pillar upper portion subassembly (1), middle part subassembly (2) is provided with nylon screen panel (5) for fixed soil horizon, the migration of moisture and solute takes place for the soil horizon between the subassembly of being convenient for.
3. The test apparatus of claim 1, wherein: the locking device (4) adopts a bolt structure; during testing, the locking sealing device (4) is closed, and all parts of the soil column can be tightly connected; in the replacement of the components or the non-test period, the locking sealing device (4) is opened, and the components can be detached and replaced; the locking device (4) is a semicircular steel plate with the inner diameter being 3cm wide and the thickness being 2mm and the inner diameter being consistent with the organic glass cylinder of the earth column assembly, two ends of the steel plate are respectively punched, the inner wall of the steel plate is provided with a rubber ring, and after the earth column assembly is assembled, the two semicircular steel plates are spliced at the assembly joint and are fixed at the joint by flange bolts, so that the stability and the tightness of the earth column are ensured.
4. The test apparatus of claim 1, wherein: the sealing structure is positioned on the contact surface of the components, an annular groove and a convex ring are respectively cut in the annular middle of the upper end and the lower end of each component organic glass cylinder, and the annular grooves of the components which are adjacent up and down are embedded with the convex rings during assembly; the base (18) and the lower component (3) are sealed in the same way; and sealing rings are arranged in the organic glass cylinder annular grooves of the organic glass cylinder, the components and the base among the components and used for sealing the joints.
5. The test apparatus of claim 1, wherein: scales are arranged on the outer wall of the organic glass cylinder of the assembly, so that the earth column can be conveniently backfilled layer by layer and compacted; a proper amount of sampling holes (6) are reserved in the side wall, the sampling holes are in a round hole shape, the hole diameter is 2-3cm, each sampling hole is provided with a water seepage prevention rubber plug, and the sampling holes are plugged by the rubber plugs when not sampling.
6. The test apparatus of claim 1, wherein: the soil layer of the earth pillar upper assembly (1) is below 5cm from the top of the earth pillar upper assembly, so that a space is reserved, and water supply of a Martensis bottle is facilitated during testing; when the water storage space is not enough, an organic glass cylinder can be additionally embedded in the upper part of the water storage space.
7. The test apparatus of claim 1, wherein: the earth pillar lower component (3) sequentially comprises a soil layer, a reverse filtering layer (7) and a nylon cloth layer (8) from top to bottom; the inverted filter layer (7) is 5-10 cm thick and is composed of fine quartz sand, coarse quartz sand and gravel.
8. The test apparatus of claim 1, wherein: soil horizon of upper, middle and lower part subassembly on the earth pillar respectively sets up soil salinity sensor (9), soil solution negative pressure sampler (10) and soil moisture temperature measurement sensor (11) that are located same horizontal plane, soil salinity sensor (9), soil moisture temperature measurement sensor (11) utilize the wire to pass through glass post preformed hole (17) and link to each other with soil salinity collector (12) and soil temperature collector (14), soil moisture collector (15), and soil solution negative pressure sampler (10) utilize the wire to pass through glass post preformed hole (17) and link to each other with sampling bottle (13).
9. The test apparatus as claimed in claims 1 to 8, wherein: the soil salinity collector (12), the soil temperature collector (14) and the soil moisture collector (15) are integrated in the soil comprehensive data collection box (16), and the soil comprehensive data collection box (16) is connected with a computer terminal to automatically measure and record data.
10. The test apparatus as claimed in claims 1 to 9, wherein: a porous flange (19) with the diameter larger than that of the earth column is arranged at the bottom of the earth column lower component (3) and is fixed with the base through bolts; the base (18) is an organic glass cylinder with the same diameter as the earth column, the upper layer is a porous flange (19), the lower layer is a circular organic glass plate, and the diameters of the porous flange (19) and the circular organic glass plate are larger than that of the earth column so as to increase the stability; a water guide hose is connected under the porous flange (19) to introduce the leaching solution into the glass bottle, and a valve (20) is arranged on the water guide hose and used for controlling leaching drainage; the middle part of the porous flange (19) is provided with a water guide pipe which is connected with a Mariotte bottle (21), and the underground water level of the soil column device is controlled by the Mariotte bottle.
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| CN118501409A (en) * | 2024-07-10 | 2024-08-16 | 中国地质调查局水文地质环境地质调查中心 | Layered monitoring well system for farmland leaching underground full section |
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