Saline-alkali soil saline water migration simulation device

Abstract

The utility model discloses a saline-alkali soil saline water migration simulation device which comprises a soil storage tank, a first soil layer, a second soil layer and a third soil layer which are laid from the bottom to the top of the soil storage tank, a first leaching layer is laid between the bottom wall of the soil storage tank and the first soil layer, and a second leaching layer is laid between the first soil layer and the second soil layer. A third leaching layer is laid between the second soil layer and the third soil layer, soil monitors are arranged in the first leaching layer, the second leaching layer and the third leaching layer, a water inlet system is arranged on one side of the soil storage tank, and a water outlet system is arranged on the other side of the soil storage tank. According to the utility model, by arranging the multi-layer leaching layer and the soil layer, the salt migration condition of soil at different depths in the water leaching process can be accurately simulated, and by arranging the soil monitor, the change condition of various indexes of the soil in the water leaching process can be dynamically simulated; in addition, an evaporation simulation system is arranged to simulate wind and heat conditions of an actual field, and the accuracy of a saline water migration simulation result in the water leaching process is further improved.

Description

Technical Field

[0001] This utility model belongs to the field of saline-alkali land improvement technology, specifically relating to a saline-alkali land brine transport simulation device. Background Technology

[0002] The formation of saline-alkali land is a complex process in which water migration and management play a crucial role. In saline-alkali land, salt often accumulates with the migration of water, resulting in excessive soil salinity and affecting the normal growth of crops. Therefore, how to effectively control the accumulation of salt with water migration has become the core issue in improving saline-alkali land.

[0003] Traditional methods for improving saline-alkali land often rely on experience and practice, lacking intuitive and effective simulation methods to predict and evaluate the effects of different improvement measures. In particular, when simulating the changes in salinity in the field as water migrates, it is necessary to fully consider the impact of natural factors such as rainfall, light and heat on the leaching and evaporation of water in the field. This makes it impossible for traditional experimental and simulation methods to realistically simulate the movement of saline-alkali land brine. Therefore, there is an urgent need in this field for a saline-alkali land brine movement simulation device. Utility Model Content

[0004] To address some or all of the technical problems existing in the prior art, this utility model provides a saline-alkali land brine transport simulation device, including a soil storage tank. The storage tank is filled with multiple soil layers to simulate saline-alkali land soil layers at different depths. These multiple soil layers include a first soil layer, a second soil layer, and a third soil layer laid from the bottom to the top of the storage tank. A first leaching layer is laid between the bottom wall of the storage tank and the first soil layer; a second leaching layer is laid between the first and second soil layers; and a third leaching layer is laid between the second and third soil layers. Soil monitors are installed in each of the first, second, and third leaching layers. The soil monitors are connected to an analysis terminal via signal data lines.

[0005] A water inlet system is provided on one side of the soil storage tank. The water inlet system includes a water pump and a water inlet pipe. The water pump is connected to a water source and a power source. One end of the water inlet pipe is connected to the water pump, and the other end is connected to a universal spray head located at the tank opening above the soil storage tank.

[0006] A water outlet system is provided on the other side of the soil storage tank opposite to the water inlet system. The water outlet system includes: a first water outlet valve, a second water outlet valve, and a third water outlet valve. A first drain outlet is provided at the end of the soil storage tank on the side where the water outlet system is provided, a second drain outlet is provided at the end of the soil storage tank on the side where the water outlet system is provided, and a third drain outlet is provided at the end of the soil storage tank on the side where the water outlet system is provided. One end of the first water outlet valve is connected to the first drain outlet and the other end is connected to a first water outlet pipe. One end of the second water outlet valve is connected to the second drain outlet and the other end is connected to a second water outlet pipe. One end of the third water outlet valve is connected to the third drain outlet and the other end is connected to a third water outlet pipe.

[0007] A water outlet switch is provided between the first water outlet valve and the first water outlet pipe, between the second water outlet valve and the second water outlet pipe, and between the third water outlet valve and the third water outlet pipe. The water outlet switch controls the opening and closing of the first water outlet valve, the second water outlet valve, and the third water outlet valve, respectively.

[0008] Furthermore, the aforementioned saline-alkali land brine transport simulation device may also include an evaporation simulation system, which includes a warm air source installed above the tank opening of the soil storage tank to simulate wind and heat conditions in the field and provide conditions for water evaporation in the field.

[0009] Preferably, in the above-mentioned saline-alkali land brine transport simulation device, the warm air source is a controllable temperature hot air blower.

[0010] Furthermore, the above-mentioned saline-alkali land brine transport simulation device also includes a water sample collection container, which is located below the first water outlet pipe, the second water outlet pipe, and the third water outlet pipe, and is used to collect the drainage from the first water outlet pipe, the second water outlet pipe, and the third water outlet pipe.

[0011] Furthermore, in the above-mentioned saline-alkali land brine transport simulation device, the thickness of the first soil layer is 20-30 cm, the thickness of the second soil layer is 25-35 cm, and the thickness of the third soil layer is 15-25 cm.

[0012] Preferably, in the above-mentioned saline-alkali land brine transport simulation device, the thickness of the first soil layer is 25cm, the thickness of the second soil layer is 30cm, and the thickness of the third soil layer is 20cm.

[0013] Furthermore, in the above-mentioned saline-alkali land brine transport simulation device, the first leaching layer, the second leaching layer, and the third leaching layer are all quartz sand leaching layers. The thickness of the quartz sand leaching layer is 5 cm, the particle size of the quartz sand in the quartz sand leaching layer is 1-2 mm, and the top and bottom of the quartz sand leaching layer are provided with edge-sealing wire mesh, the pore size of the edge-sealing wire mesh being smaller than the particle size of the quartz sand.

[0014] Furthermore, in the above-mentioned saline-alkali land brine transport simulation device, filter screens are provided in the first leaching layer, the second leaching layer, and the third leaching layer. The filter screens are respectively connected to the first drain outlet, the second drain outlet, and the third drain outlet, and the pore size of the filter screens is smaller than the particle size of the quartz sand.

[0015] Furthermore, in the above-mentioned saline-alkali land brine transport simulation device, the water inlet system also includes a level pipe, a low level controller, and a high level controller. The low level controller is installed on the level pipe and corresponds to the height of the third drainage outlet in the third leaching layer. The high level controller is installed on the level pipe and corresponds to a height of 5-10 cm above the third soil layer. The low level controller and the high level controller are connected to the water pump via a power line and a relay. When the drainage in the soil storage tank reaches the water level line corresponding to the low level controller, the low level controller controls the water pump to start, and the universal spray head evenly sprays the water into the soil surface in the soil storage tank. When the sprayed water reaches the water level line corresponding to the high level controller, the high level controller controls the water pump to stop.

[0016] This utility model's saline-alkali land brine transport simulation device has the following advantages and beneficial effects: By setting up multi-layered leaching and soil layers, this device can accurately simulate the salt transport in soil at different depths during water leaching, providing a scientific experimental method for saline-alkali land improvement and possessing good applicability and practicality. Furthermore, by incorporating a soil monitor, this device can monitor soil salinity, temperature, humidity, pH, EC, N / P / K, and other indicators in real time, thereby dynamically simulating the changes in various soil indicators during water leaching. In addition, by setting up an evaporation simulation system and adjusting wind speed and temperature to simulate actual field wind and heat conditions, this device further improves the accuracy of the brine transport simulation results during water leaching. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for further understanding of the embodiments of this utility model and constitute a part of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the saline-alkali land brine transport simulation device of this utility model.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1-Soil storage tank, 11-First leaching layer, 12-Second leaching layer, 13-Third leaching layer, 14-First soil layer, 15-Second soil layer, 16-Third soil layer, 2-Soil monitor, 21-Signal data cable, 31-Water pump, 32-Inlet pipe, 33-Level pipe, 34-Low level controller, 35-High level controller, 36-Universal sprinkler head, 37-Power cord, 41-First outlet valve, 42-Second outlet valve, 43-Third outlet valve, 44-First drain outlet, 45-Second drain outlet, 46-Third drain outlet, 47-First outlet pipe, 48-Second outlet pipe, 49-Third outlet pipe, 51-Outlet switch, 52-Filter screen, 6-Water sample collection container. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0022] like Figure 1 As shown, the saline-alkali land brine transport simulation device of this utility model includes a soil storage tank 1. The soil storage tank 1 is filled with multiple soil layers for simulating saline-alkali land soil layers of different depths. The multiple soil layers include a first soil layer 14, a second soil layer 15, and a third soil layer 16 laid from the bottom to the top of the soil storage tank 1. A first leaching layer 11 is laid between the bottom wall of the soil storage tank 1 and the first soil layer 14, a second leaching layer 12 is laid between the first soil layer 14 and the second soil layer 15, and a third leaching layer 13 is laid between the second soil layer 15 and the third soil layer 16.

[0023] Soil monitors 2 are installed in the first leaching layer 11, the second leaching layer 12, and the third leaching layer 13 to monitor soil salinity, temperature, humidity, pH, EC, N / P / K and other indicators in real time. The soil monitors 2 are connected to an analysis terminal such as a computer via a signal data line 21.

[0024] One side of storage tank 1 (e.g.) Figure 1 A water inlet system is provided on the right side shown in the figure. The water inlet system includes a water pump 31, a water inlet pipe 32, a liquid level pipe 33, a low liquid level controller 34, and a high liquid level controller 35. The water pump 31 is connected to a water source and a power source. One end of the water inlet pipe 32 is connected to the water pump 31, and the other end is connected to a universal spray head 36 located at the top of the soil storage tank 1. Thus, the water from the water pump 31 and the water inlet pipe 32 is evenly sprayed onto the soil surface in the soil storage tank 1 through the universal spray head 36. The low liquid level controller 34 and the high liquid level controller 35 are connected to the water pump 31 via a power line 37 and a relay (not shown).

[0025] The other side of the soil storage tank 1 opposite to the water inlet system (e.g. Figure 1 The left side shown is equipped with a water outlet system, which includes: a first water outlet valve 41, a second water outlet valve 42, and a third water outlet valve 43. The first leaching layer 11 is located at the end of the soil storage tank 1 on the side equipped with the water outlet system and is provided with a first drain outlet 44. The second leaching layer 12 is located at the end of the soil storage tank 1 on the side equipped with the water outlet system and is provided with a second drain outlet 45. The third leaching layer 13 is located at the end of the soil storage tank 1 on the side equipped with the water outlet system and is provided with a third drain outlet 46. One end of the first water outlet valve 41 is connected to the first drain outlet 44 and the other end is connected to a first water outlet pipe 47. One end of the second water outlet valve 42 is connected to the second drain outlet 45 and the other end is connected to a second water outlet pipe 48. One end of the third water outlet valve 43 is connected to the third drain outlet 46 and the other end is connected to a third water outlet pipe 49.

[0026] A water outlet switch 51 is installed between the first water outlet valve 41 and the first water outlet pipe 47, between the second water outlet valve 42 and the second water outlet pipe 48, and between the third water outlet valve 43 and the third water outlet pipe 49. These switches control the opening and closing of the first water outlet valve 41, the second water outlet valve 42, and the third water outlet valve 43, as well as the opening duration and frequency. For example, the water outlet switch 51 controls the first water outlet valve 41, the second water outlet valve 42, and the third water outlet valve 43 to automatically open once every three days, draining water for 10 minutes each time before automatically closing, to more realistically simulate the scenario of frequent soil flooding and drainage.

[0027] In addition, filter screens 52 are provided in the first leaching layer 11, the second leaching layer 12, and the third leaching layer 13, respectively, and the filter screens 52 are respectively connected to the first drain outlet 44, the second drain outlet 45, and the third drain outlet 46.

[0028] The low-level controller 34 in the water inlet system is installed on the level pipe 33 and corresponds to the height of the third drain outlet 46 in the third leaching layer 13. The high-level controller 35 in the water inlet system is installed on the level pipe 33 and corresponds to a height of 5-10 cm above the third soil layer 16 to simulate the height of water submerging the soil layer under flooded conditions. When the drainage in the soil storage tank 1 reaches the water level line corresponding to the low-level controller 34, the low-level controller 34 controls the water pump 31 to start, and the universal spray head 36 evenly sprays the water into the soil surface layer in the soil storage tank 1. When the sprayed water reaches the water level line corresponding to the high-level controller 35, the high-level controller 35 controls the water pump 31 to stop, thereby ensuring sufficient water intake during the water leaching simulation process to simulate the actual flooded soil layer scenario.

[0029] Furthermore, the saline-alkali land brine transport simulation device of this utility model also includes a water sample collection container 6, which is located below the first water outlet pipe 47, the second water outlet pipe 48, and the third water outlet pipe 49. It is used to collect the drainage from the first water outlet pipe 47, the second water outlet pipe 48, and the third water outlet pipe 49 for water-soluble salt detection and analysis, thereby realizing the simulation of saline-alkali land brine transport.

[0030] Furthermore, the saline-alkali land brine transport simulation device of this utility model may also include an evaporation simulation system. The evaporation simulation system includes a warm air source (not shown) installed above the tank opening of the soil storage tank 1, such as a temperature-controlled hot air blower, to simulate the wind and heat conditions in the field, thereby providing field water evaporation conditions and improving the accuracy of brine transport simulation.

[0031] In one specific embodiment, in the saline-alkali land brine transport simulation device of this utility model, the thicknesses of the first soil layer 14, the second soil layer 15, and the third soil layer 16 can be set according to the required soil layer thickness in actual use. For example, the thickness of the first soil layer 14 is 20-30 cm, the thickness of the second soil layer 15 is 25-35 cm, and the thickness of the third soil layer 16 is 15-25 cm. Preferably, the thickness of the first soil layer 14 is 25 cm, the thickness of the second soil layer 15 is 30 cm, and the thickness of the third soil layer 16 is 20 cm.

[0032] In one specific embodiment, in the saline-alkali land brine transport simulation device of this utility model, the first leaching layer 11, the second leaching layer 12, and the third leaching layer 13 are all quartz sand leaching layers. The thickness of the quartz sand leaching layer is 5cm, and the particle size of the quartz sand is 1-2mm. The top and bottom of the quartz sand leaching layer are provided with edge-sealing wire mesh. The pore size of the edge-sealing wire mesh is smaller than the particle size of the quartz sand, for example, 0.8mm, to prevent the quartz sand in the quartz sand leaching layer from escaping into the soil layer through the edge-sealing wire mesh, thus affecting the accuracy of the soil brine transport simulation.

[0033] In one specific embodiment, in the saline-alkali land brine transport simulation device of this utility model, the pore size of the filter screen 52 set in the first leaching layer 11, the second leaching layer 12, and the third leaching layer 13 is smaller than the particle size of the quartz sand, for example, 0.8 mm, to prevent the quartz sand in the quartz sand leaching layer from entering the first outlet valve 41, the second outlet valve 42, and the third outlet valve 43 with the drainage through the filter screen 52, or even flowing into the water sample collection container 6 through the first outlet pipe 47, the second outlet pipe 48, and the third outlet pipe 49, which would cause the outlet valves to be blocked and affect the accuracy of the soil brine transport simulation.

[0034] The working principle and process of this utility model's saline-alkali land brine transport simulation device are as follows:

[0035] As a specific application scenario, for example, if the thickness of the saline-alkali soil layer to be simulated is less than 20cm, the first water outlet valve 41 and the second water outlet valve 42 are closed by the water outlet switch 51, and the opening duration and frequency of the third water outlet valve 43 are controlled. Water is evenly sprayed onto the soil surface in the soil storage tank 1 through the water pump 31, the water inlet pipe 32, and the universal spray head 36. Under the action of gravity, the water penetrates downward through the third soil 16 and enters the third leaching layer 13. It flows into the water sample collection container 6 through the third drain outlet 46, the third water outlet valve 43, and the third water outlet pipe 49 in the third leaching layer 13. Thus, the water-soluble salt content of the drainage collected in the water sample collection container 6 can be detected and analyzed, thereby obtaining the simulation results of salt water migration in a soil layer with a thickness of less than 20cm during water leaching. Meanwhile, during the simulated water leaching process and brine transport, soil monitors 2 installed in the third leaching layer 13 monitor soil salinity, temperature, humidity, pH, EC, N / P / K, and other indicators in real time. This allows for the dynamic simulation of changes in various soil indicators during water leaching. Furthermore, a controllable-temperature hot air blower located at the opening above the storage tank 1 can be activated. By setting different wind speeds and temperatures, the actual wind and heat conditions in the field can be simulated, further improving the accuracy of the brine transport simulation results during water leaching.

[0036] As another specific application scenario, for example, if the thickness of the saline-alkali soil layer to be simulated is greater than 20cm and less than 50cm, the first water outlet valve 41 is closed by the water outlet switch 51, and the opening duration and frequency of the second water outlet valve 42 and the third water outlet valve 43 are controlled. Through the water pump 31, the water inlet pipe 32, and the universal spray head 36, the incoming water is evenly sprayed onto the surface layer of the soil in the soil storage tank 1. Under the action of gravity, the incoming water permeates downwards, passing through the third soil 16, the third leaching layer 13, and the second soil layer 16 in sequence. Soil 15 enters the second leaching layer 12 and flows into the water sample collection container 6 via the third drainage outlet 46, third outlet valve 43, and third outlet pipe 49 in the third leaching layer 13, and the second drainage outlet 45, second outlet valve 42, and second outlet pipe 48 in the second leaching layer 12. This allows for the analysis of water-soluble salt content in the collected water sample collection container 6, providing simulation results of brine transport in soil layers thicker than 20cm and less than 50cm during water leaching. Simultaneously, during the simulated brine transport process, soil monitors 2 installed in the third and second leaching layers 13 and 12 monitor soil salinity, temperature, humidity, pH, EC, N / P / K, and other indicators in real time, dynamically simulating changes in various soil indicators during water leaching. Furthermore, a controllable temperature hot air blower located above the storage tank 1 can be activated. By setting different wind speeds and temperatures, the actual wind and heat conditions in the field can be simulated, further improving the accuracy of the brine transport simulation results during water leaching.

[0037] As another specific application scenario, for example, if the thickness of the saline-alkali soil layer to be simulated is greater than 50cm, the opening duration and frequency of the first water outlet valve 41, the second water outlet valve 42, and the third water outlet valve 43 are controlled by the water outlet switch 51. Through the water pump 31, the water inlet pipe 32, and the universal spray head 36, the incoming water is evenly sprayed onto the surface layer of the soil in the soil storage tank 1. Under the action of gravity, the incoming water permeates downwards, passing through the third soil 16, the third leaching layer 13, the second soil 15, the second leaching layer 12, the first soil layer 14, and then into the first leaching layer. Layer 11, via the third drain outlet 46, third outlet valve 43, and third outlet pipe 49 in the third leaching layer 13, the second drain outlet 45, second outlet valve 42, and second outlet pipe 48 in the second leaching layer 12, and the first drain outlet 44, first outlet valve 41, and first outlet pipe 47 in the first leaching layer 11, flows into the water sample collection container 6. This allows for the analysis of water-soluble salt content in the collected water sample collection container 6, thus providing simulated results of saltwater transport in soil layers thicker than 50 cm during water leaching. Simultaneously, during the simulated saltwater transport process, soil monitors 2 installed in the third leaching layer 13, second leaching layer 12, and first leaching layer 11 monitor soil salinity, temperature, humidity, pH, EC, N / P / K, and other indicators in real time, thereby dynamically simulating the changes in various soil indicators during water leaching. In addition, a controllable temperature hot air blower installed above the tank opening of soil storage tank 1 can be activated. By setting different wind speeds and temperatures, the wind and heat conditions in the actual field can be simulated, further improving the accuracy of the simulation results of brine transport during water leaching.

[0038] In summary, compared with the prior art, the saline-alkali land brine transport simulation device of this utility model has the following advantages and beneficial effects:

[0039] This device, by setting up multi-layered leaching and soil layers, can accurately simulate salt transport during water leaching in soil at different depths, providing a scientific experimental method for saline-alkali land improvement and demonstrating good applicability and practicality. Furthermore, by incorporating soil monitors, the device can monitor soil salinity, temperature, humidity, pH, EC, N / P / K ratios in real time, thereby dynamically simulating changes in various soil parameters during water leaching. In addition, by setting an evaporation simulation system and adjusting wind speeds and temperatures to simulate actual field wind and heat conditions, the device further improves the accuracy of the saltwater transport simulation results during water leaching.

[0040] Furthermore, this device, through the setting of low-level and high-level controllers, activates the water pump when the water level in the storage tank reaches the level corresponding to the low-level controller, and the universal spray head evenly sprays the incoming water onto the soil surface in the storage tank. Once the sprayed water reaches the level corresponding to the high-level controller, the water pump shuts off, thus ensuring sufficient water intake during the water leaching simulation process. Moreover, by controlling the opening and closing of the first, second, and third outlet valves, as well as their opening duration and frequency, through water outlet switches, it can more realistically simulate the scenario of multiple waterlogging and drainage of the soil layer, thereby further improving the accuracy of the brine transport simulation results during the water leaching process.

[0041] It should be noted that, unless otherwise expressly specified and limited, the term "connection" or its synonyms should be interpreted broadly in this document. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. At the same time, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In addition, "front," "rear," "left," "right," "upper," and "lower" in this document refer to the placement state shown in the accompanying drawings.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A device for simulating saline-alkali land saline water transport, characterized in that, The saline-alkali land brine transport simulation device includes a soil storage tank filled with multiple soil layers to simulate saline-alkali soil layers at different depths. These soil layers include a first soil layer, a second soil layer, and a third soil layer laid from the bottom to the top of the storage tank. A first leaching layer is laid between the bottom wall of the storage tank and the first soil layer; a second leaching layer is laid between the first and second soil layers; and a third leaching layer is laid between the second and third soil layers. Soil monitors are installed within each of the first, second, and third leaching layers, and these monitors are connected to an analysis terminal via signal data lines. A water inlet system is provided on one side of the soil storage tank. The water inlet system includes a water pump and a water inlet pipe. The water pump is connected to a water source and a power source. One end of the water inlet pipe is connected to the water pump, and the other end is connected to a universal spray head located at the tank opening above the soil storage tank. A water outlet system is provided on the other side of the soil storage tank opposite to the water inlet system. The water outlet system includes: a first water outlet valve, a second water outlet valve, and a third water outlet valve. A first drain outlet is provided at the end of the soil storage tank on the side where the water outlet system is provided, a second drain outlet is provided at the end of the soil storage tank on the side where the water outlet system is provided, and a third drain outlet is provided at the end of the soil storage tank on the side where the water outlet system is provided. One end of the first water outlet valve is connected to the first drain outlet and the other end is connected to a first water outlet pipe. One end of the second water outlet valve is connected to the second drain outlet and the other end is connected to a second water outlet pipe. One end of the third water outlet valve is connected to the third drain outlet and the other end is connected to a third water outlet pipe. A water outlet switch is provided between the first water outlet valve and the first water outlet pipe, between the second water outlet valve and the second water outlet pipe, and between the third water outlet valve and the third water outlet pipe. The water outlet switch controls the opening and closing of the first water outlet valve, the second water outlet valve, and the third water outlet valve, as well as the opening duration and opening frequency.

2. The saline-alkali land brine transport simulation device according to claim 1, characterized in that, The saline-alkali land brine transport simulation device also includes an evaporation simulation system, which includes a warm air source installed above the tank opening of the soil storage tank to simulate the wind and heat conditions in the field and provide conditions for water evaporation in the field.

3. The saline-alkali land brine transport simulation device according to claim 2, characterized in that, The warm air source is a temperature-controlled hot air blower.

4. The saline-alkali land brine transport simulation device according to claim 1, characterized in that, The saline-alkali land saline water transport simulation device also includes a water sample collection container, which is located below the first water outlet pipe, the second water outlet pipe, and the third water outlet pipe, and is used to collect the drainage from the first water outlet pipe, the second water outlet pipe, and the third water outlet pipe.

5. The saline-alkali land brine transport simulation device according to claim 1, characterized in that, The thickness of the first soil layer is 20-30 cm, the thickness of the second soil layer is 25-35 cm, and the thickness of the third soil layer is 15-25 cm.

6. The saline-alkali land brine transport simulation device according to claim 1, characterized in that, The thickness of the first soil layer is 25cm, the thickness of the second soil layer is 30cm, and the thickness of the third soil layer is 20cm.

7. The saline-alkali land brine transport simulation device according to claim 1, characterized in that, The first leaching layer, the second leaching layer, and the third leaching layer are all quartz sand leaching layers. The thickness of the quartz sand leaching layer is 5 cm, and the particle size of the quartz sand in the quartz sand leaching layer is 1-2 mm. The top and bottom of the quartz sand leaching layer are provided with edge-sealing wire mesh, and the pore size of the edge-sealing wire mesh is smaller than the particle size of the quartz sand.

8. The saline-alkali land brine transport simulation device according to claim 7, characterized in that, A filter screen is provided in the first leaching layer, the second leaching layer, and the third leaching layer. The filter screen is respectively connected to the first drain outlet, the second drain outlet, and the third drain outlet, and the pore size of the filter screen is smaller than the particle size of the quartz sand.

9. The saline-alkali land brine transport simulation device according to claim 1, characterized in that, The water inlet system also includes a level pipe, a low level controller, and a high level controller. The low level controller is installed on the level pipe and corresponds to the height of the third drain outlet in the third leaching layer. The high level controller is installed on the level pipe and corresponds to a height of 5-10 cm above the third soil layer. The low level controller and the high level controller are connected to the water pump via a power line and a relay. When the water level in the soil storage tank reaches the water level line corresponding to the low level controller, the low level controller controls the water pump to start, and the universal spray head evenly sprays the water onto the soil surface in the soil storage tank. When the sprayed water reaches the water level line corresponding to the high level controller, the high level controller controls the water pump to stop.

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