A device and method for determining the two-dimensional movement law of soil moisture in arsenic-rich sandstone areas

Abstract

This invention relates to a device and method for measuring the two-dimensional movement of soil moisture in sandstone areas. The device includes a housing, a partition, and a moisture sensor. The housing has several detection holes on its side walls, through which the moisture sensor detects the moisture content of corresponding soil layers within the housing. The housing includes a horizontal observation area and a vertical observation area arranged side-by-side. Several pairs of opposing vertical slots and several pairs of opposing horizontal slots are formed on two opposite inner side walls of the housing. The vertical slots are located in the vertical observation area, and the horizontal slots are located in the horizontal observation area. The partition is detachably fitted into a pair of opposing vertical or horizontal slots. This invention's measuring device is not limited by topographical or other environmental factors, facilitates repeated experiments, and offers high detection accuracy, enabling the observation of soil moisture movement patterns in both vertical and horizontal directions.

Description

Technical Field

[0001] This invention relates to the technical fields of two-dimensional movement law of soil moisture and hydraulic erosion monitoring, and in particular to a device and method for measuring the two-dimensional movement law of soil moisture in sandstone areas. Background Technology

[0002] The infiltration of water into soil is a crucial link in the natural water cycle and a primary process by which water is transformed into a form that can be absorbed and utilized by plants and animals in the soil system. Soil infiltration capacity is one of the fundamental properties of soil, and soil water movement occurs in both one-dimensional and two-dimensional directions. Currently, domestic devices and methods for measuring two-dimensional soil water movement are mostly applied to loess, purple soil, and sandy areas, with relatively few studies on sandstone areas, particularly regarding the unclear mechanisms by which soil factors influence soil water movement. The infiltration process differs depending on the soil texture, which is closely related to the infiltration channels formed between soil particles. For example, macropore flow is common in silt and clay soils, finger flow and unsaturated gravity flow are common in sandy or fine-grained water-driving soils, and funnel flow often occurs in sandy soils. The exposed bedrock of arsenic sandstone, due to the swelling and disintegration of montmorillonite in its minerals upon contact with water, undergoes changes in particle pore structure, and the water infiltration process differs from that of ordinary soil. Therefore, designing corresponding experiments to observe its infiltration channels and water change process, and studying the two-dimensional movement law of soil moisture in arsenic sandstone areas and its influencing mechanism, can provide data support for the simulation of hydrological processes and prediction of soil erosion in arsenic sandstone areas, which is of great significance for promoting the development of ecological restoration work in this area in an ideal direction.

[0003] Currently, there are no unified domestic or international standards for measuring the two-dimensional movement of soil moisture in sandstone areas. Existing methods include double-ring or single-ring infiltration methods, which are easily limited by terrain, making repeated experiments difficult, and have low measurement accuracy. Another method is the indoor constant head method, which, although the variables are controllable, cannot observe the movement of soil moisture in the vertical and horizontal directions. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a device and method for measuring the two-dimensional movement law of soil moisture in arsenic sandstone areas, which addresses the shortcomings of the prior art.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A device for measuring the two-dimensional movement law of soil moisture in arsenic sandstone areas includes a box, a partition and a moisture sensor. The side wall of the box is provided with a plurality of detection holes, and the moisture sensor detects the moisture content of the corresponding soil layer in the box through the detection holes. The box includes a horizontal observation area and a vertical observation area arranged side by side. A plurality of pairs of oppositely arranged vertical slots and a plurality of pairs of oppositely arranged horizontal slots are provided on the two opposite inner side walls of the box. The vertical slots are located in the vertical observation area and the horizontal slots are located in the horizontal observation area. The partition is pluggably provided with a pair of oppositely arranged vertical slots or horizontal slots.

[0006] The beneficial effects of the present invention are: the measuring device of the present invention is not limited by environmental factors such as terrain, which is conducive to carrying out repeated experiments, and has high detection accuracy, and can observe the movement pattern of soil moisture in the vertical and horizontal directions.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the detection holes are arranged in one or more columns.

[0009] The beneficial effect of adopting the above-mentioned further scheme is that it allows for the detection of soil moisture content at different altitudes.

[0010] Furthermore, the bottom of the box is provided with a drainage hole and an exhaust hole.

[0011] Furthermore, it also includes a Marshall bottle, the bottom of which is connected to the top of the housing.

[0012] The advantage of adopting the above-mentioned further scheme is that using a Marshall bottle for infiltration of brilliant blue solution makes it convenient to record the infiltration rate and the amount of solution used.

[0013] Furthermore, the enclosure is made of transparent plexiglass.

[0014] The advantage of adopting the above-mentioned further scheme is that it facilitates the observation of the infiltration process.

[0015] Furthermore, one side wall of the box located in the horizontal observation area can be detachably connected to the box; or, both one side wall of the box located in the horizontal observation area and one side wall located in the vertical observation area can be detachably connected to the box.

[0016] The beneficial effect of adopting the above-mentioned further solution is that it facilitates the removal of one or both side walls of the box and the insertion of the partition from one end of the box in a horizontal direction.

[0017] Furthermore, the bottom plate of the box is detachably connected to the box body. When the box body is used for field testing, the bottom of the box body can be removed and inserted into the soil without affecting the original soil structure.

[0018] Furthermore, the box body is a cuboid structure, the horizontal observation area and the vertical observation area are arranged side by side along the length of the box body, and the detection hole is located on at least one end face of the cuboid structure along the length.

[0019] The advantages of adopting the above-mentioned further solution are: it facilitates the insertion of the partition into the box and allows for observation of the water movement patterns in two different directions.

[0020] Furthermore, the two end faces of the cuboid structure along its length are squares, and the horizontal observation area and the vertical observation area are cube structures.

[0021] Furthermore, the housing is also provided with sampling holes. These sampling holes may share the same set of through holes as the detection holes, or they may be separately provided. The sampling holes facilitate sampling and observation.

[0022] A method for determining the two-dimensional movement law of soil moisture in arsenic-rich sandstone areas includes the following steps:

[0023] S1. Apply Vaseline to the inner and outer walls of the box.

[0024] S2, the soil collected from the field is filled in layers according to the natural layer structure, moisture content and bulk density of the soil, and the layers are roughened.

[0025] S3, using point source infiltration of brilliant blue solution or area source infiltration of brilliant blue solution;

[0026] S4, after a preset time, insert the first partition into the corresponding horizontal slot in the horizontal observation area according to the horizontal direction, and insert the second partition into the corresponding vertical slot in the vertical observation area according to the vertical direction.

[0027] S5, remove the first partition to obtain several layers of horizontal soil profile; remove the second partition to obtain several layers of vertical soil profile.

[0028] S6 was used to photograph different soil profiles, and water movement parameters were calculated.

[0029] The beneficial effects of the present invention are: the measurement method of the present invention is not limited by environmental factors such as terrain, which is conducive to carrying out repeated experiments, and the detection accuracy is high, which can observe the movement pattern of soil moisture in the vertical and horizontal directions. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structural diagram of the housing of the present invention;

[0031] Figure 2 This is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the infiltration process of the present invention.

[0033] The attached diagram lists the components represented by each number as follows:

[0034] 1. Box body; 11. Inspection hole; 12. Horizontal slot; 13. Vertical slot; 14. Horizontal observation area; 15. Vertical observation area; 16. Drainage hole;

[0035] 2. Partition; 3. Mascherano bottle; 4. Soil; 5. Dyed area. Detailed Implementation

[0036] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0037] Example 1

[0038] like Figures 1-3 As shown in this embodiment, a device for measuring the two-dimensional movement law of soil moisture in an arsenic-rich sandstone area includes a housing 1, a partition 2, and a moisture sensor. The housing 1 has several detection holes 11 on its sidewalls, through which the moisture sensor detects the moisture content of the corresponding soil layer within the housing 1. The housing 1 includes horizontal observation areas 14 arranged side-by-side with vertical observation areas 15. Several pairs of opposing vertical slots 13 and several pairs of opposing horizontal slots 12 are provided on the two opposite inner sidewalls of the housing 1. The vertical slots 13 are located in the vertical observation areas 15, and the horizontal slots 12 are located in the horizontal observation areas 14. The partition 2 is detachably disposed within a pair of opposing vertical slots 13 or horizontal slots 12. The partition 2 can be made of metal or glass; the metal plate can be iron. The number of partitions 2 in the vertical slots 13 can be one, two, or more. Inserting the partitions 2 into the vertical slots 13 separates the soil layers, creating several vertical soil layers of a certain thickness. The horizontal slot 12 can contain one, two, or more partitions 2. Inserting the partitions 2 into the horizontal slot 12 separates the soil layers, creating several horizontal soil layers of a certain thickness. At least one detection hole 11 and / or sampling hole can be installed at the location corresponding to each horizontal soil layer. The sampling hole and detection hole 11 can share a set of through holes. During the experiment, a moisture sensor is inserted into the detection hole 11, and the detection hole is sealed with an impermeable material. The moisture sensor is connected to a data acquisition device to observe and record changes in moisture content over time. When not in use, the detection hole or sampling hole can be plugged.

[0039] In this embodiment, one side wall of the housing 1 located in the horizontal observation area 14 is detachably connected to the housing 1; or, both one side wall of the housing 1 located in the horizontal observation area and one side wall located in the vertical observation area are detachably connected to the housing. This facilitates the removal of one or both side walls of the housing, allowing a partition to be inserted horizontally from one end of the housing.

[0040] In this embodiment, the bottom plate of the box 1 is detachably connected to the box 1. When the box is used for field testing, the bottom of the box can be removed and inserted into the soil without affecting the original soil structure.

[0041] The measuring device in this embodiment is not limited by environmental factors such as terrain, which is conducive to carrying out repeated experiments. It also has high detection accuracy and can observe the movement pattern of soil moisture in the vertical and horizontal directions.

[0042] Example 2

[0043] like Figures 1-3 As shown in the figure, a device for measuring the two-dimensional movement law of soil moisture in an arsenic sandstone area according to this embodiment includes a box 1, a partition 2, and a moisture sensor. The side wall of the box 1 is provided with a plurality of detection holes 11, and the moisture sensor detects the moisture content of the corresponding soil layer in the box 1 through the detection holes 11. The box 1 includes a horizontal observation area 14 and a vertical observation area 15 arranged side by side. The two opposite inner side walls of the box 1 are provided with a plurality of pairs of oppositely arranged vertical slots 13 and a plurality of pairs of oppositely arranged horizontal slots 12. The vertical slots 13 are located in the vertical observation area 15, and the horizontal slots 12 are located in the horizontal observation area 14. The partition 2 is pluggably disposed in a pair of oppositely arranged vertical slots 13 or horizontal slots 12.

[0044] The detection holes 11 are arranged in one or more rows, allowing for the detection of soil moisture content at different heights. The partitions 2 can be metal or glass plates; iron plates are a suitable metal plate. The vertical slots 13 can contain one, two, or more partitions 2. Inserting partitions 2 into the vertical slots 13 separates the soil layers, creating several vertical soil layers of a certain thickness. Similarly, the horizontal slots 12 can contain one, two, or more partitions 2. Inserting partitions 2 into the horizontal slots 12 separates the soil layers, creating several horizontal soil layers of a certain thickness. At least one detection hole 11 and / or sampling hole can be provided at the location corresponding to each horizontal soil layer. The sampling hole and detection hole 11 can share a set of through holes. During testing, a moisture sensor is inserted into the detection hole 11, and the detection hole is sealed with a waterproof material. The moisture sensor is connected to a data acquisition device to observe and record changes in moisture content over time. When not in use, the detection hole or sampling hole can be plugged.

[0045] The partition 2 in this embodiment can also have a grid, so that the shape of the wet tip can be drawn with a pen when there is no camera.

[0046] like Figure 2 As shown, the bottom of the box 1 in this embodiment is provided with a drain hole 16 and an exhaust hole.

[0047] like Figure 2 As shown, the measuring device in this embodiment also includes a Marshall bottle 3, the bottom of which is connected to the top of the housing 1. Using a Marshall bottle for the infiltration of brilliant blue solution facilitates the recording of the infiltration rate and the amount of solution used.

[0048] The box 1 in this embodiment is made of transparent plexiglass, which facilitates observation of the infiltration process.

[0049] In this embodiment, one side wall of the housing 1 located in the horizontal observation area 14 is detachably connected to the housing 1; or, both one side wall of the housing 1 located in the horizontal observation area and one side wall located in the vertical observation area are detachably connected to the housing. This facilitates the removal of one or both side walls of the housing, allowing a partition to be inserted horizontally from one end of the housing.

[0050] In this embodiment, the bottom plate of the box 1 is detachably connected to the box 1. When the box is used for field testing, the bottom of the box can be removed and inserted into the soil without affecting the original soil structure.

[0051] like Figures 1-3 As shown, the box 1 in this embodiment has a cuboid structure. The horizontal observation area 14 and the vertical observation area 15 are arranged side by side along the length of the box 1. The detection hole 11 is located on at least one end face of the cuboid structure along the length. This facilitates the insertion of the partition into the box and the observation of the water movement patterns in two different directions.

[0052] like Figure 1 and Figure 2 As shown, the two end faces of the cuboid structure along its length are squares, and the horizontal observation area 14 and the vertical observation area 15 are cube structures.

[0053] In this embodiment, the housing 1 is also provided with a sampling hole. The sampling hole shares the same set of through holes as the detection hole, or it can be provided separately. The sampling hole facilitates sampling and observation.

[0054] A method for determining the two-dimensional movement law of soil moisture in arsenic-rich sandstone areas includes the following steps:

[0055] S1. Apply Vaseline to the inner and outer walls of box 1 to prevent dye from seeping down along the gaps in the inner wall of the glass plate of box 1.

[0056] S2, the soil collected from the field 4 is filled in layers according to the natural layer structure, moisture content and bulk density of the soil, and the layers are roughened.

[0057] S3, using Maslow's flask 3, point-source osmosis of brilliant blue solution is employed to stain area 5 as shown in... Figure 3 As shown; the concentration of the brilliant blue solution was 4 g / L; during the experiment, water was supplied using a Marshall bottle to maintain the soil column infiltration at a constant water head of about 2 cm, and the Marshall bottle readings were recorded at different times.

[0058] S4. After a preset time (e.g., 12-24 hours later), insert the first partition into the corresponding horizontal slot 12 in the horizontal observation area 14 according to the horizontal direction, and insert the second partition into the corresponding vertical slot 13 in the vertical observation area 15 according to the vertical direction.

[0059] S5, remove the first partition to obtain several layers of horizontal soil profile; remove the second partition to obtain several layers of vertical soil profile.

[0060] S6 was used to photograph different soil profiles, and water movement parameters were calculated.

[0061] Specifically, the camera was used in macro mode (P) with a fixed focal length of 21mm and a fixed distance of 30cm between the camera lens and the soil profile. After setting the scale and GPS points, different profiles were photographed. ArcGIS was used to correct the image coordinates, followed by Photoshop CS for color processing and area calculation. Matlab numerical analysis software was used to process the bitmap. Simultaneously, data from a moisture sensor was used to obtain information on the distance, direction, and speed of water movement.

[0062] The measuring device and method of this embodiment are not limited by environmental factors such as terrain, which is conducive to carrying out repeated experiments. Moreover, the detection accuracy is high, and it is possible to observe the movement pattern of soil moisture in the vertical and horizontal directions.

[0063] Example 3

[0064] like Figures 1-3As shown in the figure, a device for measuring the two-dimensional movement law of soil moisture in an arsenic sandstone area according to this embodiment includes a box 1, a partition 2, and a moisture sensor. The side wall of the box 1 is provided with a plurality of detection holes 11, and the moisture sensor detects the moisture content of the corresponding soil layer in the box 1 through the detection holes 11. The box 1 includes a horizontal observation area 14 and a vertical observation area 15 arranged side by side. The two opposite inner side walls of the box 1 are provided with a plurality of pairs of oppositely arranged vertical slots 13 and a plurality of pairs of oppositely arranged horizontal slots 12. The vertical slots 13 are located in the vertical observation area 15, and the horizontal slots 12 are located in the horizontal observation area 14. The partition 2 is pluggably disposed in a pair of oppositely arranged vertical slots 13 or horizontal slots 12.

[0065] The detection holes 11 are arranged in one or more rows, allowing for the detection of soil moisture content at different heights. The partitions 2 can be metal or glass plates; iron plates are a suitable metal plate. The vertical slots 13 can contain one, two, or more partitions 2. Inserting partitions 2 into the vertical slots 13 separates the soil layers, creating several vertical soil layers of a certain thickness. Similarly, the horizontal slots 12 can contain one, two, or more partitions 2. Inserting partitions 2 into the horizontal slots 12 separates the soil layers, creating several horizontal soil layers of a certain thickness. At least one detection hole 11 and / or sampling hole can be provided at the location corresponding to each horizontal soil layer. The sampling hole and detection hole 11 can share a set of through holes. During testing, a moisture sensor is inserted into the detection hole 11, and the detection hole is sealed with a waterproof material. The moisture sensor is connected to a data acquisition device to observe and record changes in moisture content over time. When not in use, the detection hole or sampling hole can be plugged.

[0066] The partition 2 in this embodiment can also have a grid, so that the shape of the wet tip can be drawn with a pen when there is no camera.

[0067] like Figure 2 As shown, the bottom of the box 1 in this embodiment is provided with a drain hole 16 and an exhaust hole.

[0068] The box 1 in this embodiment is made of transparent plexiglass, which facilitates observation of the infiltration process.

[0069] In this embodiment, one side wall of the housing 1 located in the horizontal observation area 14 is detachably connected to the housing 1; or, both one side wall of the housing 1 located in the horizontal observation area and one side wall located in the vertical observation area are detachably connected to the housing. This facilitates the removal of one or both side walls of the housing, allowing a partition to be inserted horizontally from one end of the housing.

[0070] In this embodiment, the bottom plate of the box 1 is detachably connected to the box 1. When the box is used for field testing, the bottom of the box can be removed and inserted into the soil without affecting the original soil structure.

[0071] like Figures 1-3 As shown, the box 1 in this embodiment has a cuboid structure. The horizontal observation area 14 and the vertical observation area 15 are arranged side by side along the length of the box 1. The detection hole 11 is located on at least one end face of the cuboid structure along the length. This facilitates the insertion of the partition into the box and the observation of the water movement patterns in two different directions.

[0072] like Figure 1 and Figure 2 As shown, the two end faces of the cuboid structure along its length are squares, and the horizontal observation area 14 and the vertical observation area 15 are cube structures.

[0073] In this embodiment, the housing 1 is also provided with a sampling hole. The sampling hole shares the same set of through holes as the detection hole, or it can be provided separately. The sampling hole facilitates sampling and observation.

[0074] A method for determining the two-dimensional movement law of soil moisture in arsenic-rich sandstone areas includes the following steps:

[0075] S1. Apply Vaseline to the inner and outer walls of box 1 to prevent dye from seeping down along the gaps in the inner wall of the glass plate of box 1.

[0076] S2, the soil collected from the field 4 is filled in layers according to the natural layer structure, moisture content and bulk density of the soil, and the layers are roughened.

[0077] S3, using surface-source infiltration of brilliant blue solution, the brilliant blue solution can be poured into box 1, and the staining area 5 is as follows. Figure 3 As shown;

[0078] S4. After a preset time (e.g., 12-24 hours later), insert the first partition into the corresponding horizontal slot 12 in the horizontal observation area 14 according to the horizontal direction, and insert the second partition into the corresponding vertical slot 13 in the vertical observation area 15 according to the vertical direction.

[0079] S5, remove the first partition to obtain several layers of horizontal soil profile; remove the second partition to obtain several layers of vertical soil profile.

[0080] S6 was used to photograph different soil profiles, and water movement parameters were calculated.

[0081] Specifically, the camera was used in macro mode (P) with a fixed focal length of 21mm and a fixed distance of 30cm between the camera lens and the soil profile. After setting the scale and GPS points, different profiles were photographed. ArcGIS was used to correct the image coordinates, followed by Photoshop CS for color processing and area calculation. Matlab numerical analysis software was used to process the bitmap. Simultaneously, data from a moisture sensor was used to obtain information on the distance, direction, and speed of water movement.

[0082] The measuring device and method of this embodiment are not limited by environmental factors such as terrain, which is conducive to carrying out repeated experiments. Moreover, the detection accuracy is high, and it is possible to observe the movement pattern of soil moisture in the vertical and horizontal directions.

[0083] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0084] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0085] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0086] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0087] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for determining the two-dimensional movement law of soil moisture in arsenic-rich sandstone areas, characterized in that, A two-dimensional soil moisture movement measurement device is used in arsenic-rich sandstone areas. The device includes a housing, a partition, and a moisture sensor. Several detection holes are provided on the side wall of the housing, and the moisture sensor detects the moisture content of the corresponding soil layer within the housing through these detection holes. The housing includes a horizontal observation area and a vertical observation area arranged parallel to the horizontal observation area. Several pairs of opposing vertical slots and several pairs of opposing horizontal slots are provided on the two opposite inner side walls of the housing. The vertical slots are located in the vertical observation area, and the horizontal slots are located in the horizontal observation area. The partition is detachably installed in one or more of the opposing vertical or horizontal slots. The determination method includes the following steps: S1. Apply Vaseline to the inner and outer walls of the box. S2, the soil collected from the field is filled in layers according to the natural layer structure, moisture content and bulk density of the soil, and the layers are roughened. S3, using point source infiltration of brilliant blue solution or area source infiltration of brilliant blue solution; S4, after a preset time, insert the first partition into the corresponding horizontal slot in the horizontal observation area according to the horizontal direction, and insert the second partition into the corresponding vertical slot in the vertical observation area according to the vertical direction. S5, remove the first partition to obtain several layers of horizontal soil profile; remove the second partition to obtain several layers of vertical soil profile. S6 was used to photograph different soil profiles, and water movement parameters were calculated.

2. The method for determining the two-dimensional movement law of soil moisture in arsenic-rich sandstone areas according to claim 1, characterized in that, The detection holes are arranged in one or more columns.

3. The method for determining the two-dimensional movement law of soil moisture in arsenic-rich sandstone areas according to claim 1, characterized in that, It also includes a Marshall bottle, the bottom of which is connected to the top of the housing.

4. The method for determining the two-dimensional movement law of soil moisture in arsenic-rich sandstone areas according to claim 1, characterized in that, The enclosure is made of transparent plexiglass.

5. The method for determining the two-dimensional movement law of soil moisture in arsenic-rich sandstone areas according to claim 1, characterized in that, The side wall of the box located in the horizontal observation area is detachably connected to the box.

6. The method for determining the two-dimensional movement law of soil moisture in arsenic-rich sandstone areas according to claim 1, characterized in that, Both the side wall of the box located in the horizontal observation area and the side wall located in the vertical observation area can be detachably connected to the box.

7. The method for determining the two-dimensional movement law of soil moisture in arsenic-rich sandstone areas according to claim 1, characterized in that, The bottom plate of the box is detachably connected to the box body.

8. The method for determining the two-dimensional movement law of soil moisture in arsenic-rich sandstone areas according to claim 1, characterized in that, The box is a cuboid structure, and the horizontal observation area and the vertical observation area are arranged side by side along the length of the box. The detection hole is located on at least one end face of the cuboid structure along the length.

9. The method for determining the two-dimensional movement law of soil moisture in arsenic-rich sandstone areas according to claim 8, characterized in that, The cuboid structure has two square ends along its length, and the horizontal and vertical observation areas are both cube structures.

10. The method for determining the two-dimensional movement law of soil moisture in arsenic-rich sandstone areas according to claim 1, characterized in that, The box body is also provided with a sampling hole, and the bottom of the box body is provided with a drainage hole and an exhaust hole.

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