Weighing lysimeter

Abstract

The utility model discloses a weighing lysimeter which comprises a weighing lysimeter main body, a lysimeter data acquisition control device and a drainage device, and the weighing lysimeter main body and the drainage device are respectively connected with the lysimeter data acquisition control device; the drainage device comprises a box body, a water collecting groove is formed in the bottom of the box body, a water suction pump is arranged on one side of the water collecting groove, an inlet of the water suction pump is communicated with the water collecting groove, an outlet of the water suction pump is connected with a liquid conveying pipe, and the liquid conveying pipe extends out from the upper end of the box body. Water permeating out of the weighing lysimeter body is received through the liquid collecting box, and a one-way valve is arranged at the upper end of the liquid collecting box. According to the utility model, the seepage water in the soil is monitored, so that the water seepage data of the soil can be measured, and the measurement of the evapotranspiration of the soil is improved; and when the collected water in the drainage device reaches a certain value or is manually involved, the accumulated water can be automatically pumped out, and the change of the underground water level is accurately controlled.

Description

Technical Field

[0001] The utility model belongs to the technical field of soil lysimeters, and in particular relates to a weighing lysimeter. Background Art

[0002] Lysimeters are essential tools for studying water balance in agriculture, forestry, and other environmental sciences. They are characterized by their ability to quantitatively measure actual evapotranspiration from both bare and vegetated land. Furthermore, lysimeters can collect seepage water from their soil columns, which can be used to estimate water loss within the soil profile and its recharge to groundwater. Seepage water can be analyzed for solute composition in the laboratory, allowing lysimeters to monitor the transport of different solutes in the soil.

[0003] Gravimetric lysimeters, on the other hand, continuously monitor the weight of a soil column, providing detailed information on changes in water content over any period of time. Combined with rainfall and seepage data, water losses can be determined as evapotranspiration. Therefore, lysimeters can be used to simulate the natural relationship between soil, atmosphere, and plants, enabling the integration of laboratory studies with field experiments.

[0004] At present, traditional evaporation meters generally include an outer tube and an inner tube. During monitoring, water seeps through the bottom of the inner tube to the bottom of the outer tube, and then is discharged into the collection well through the seepage pipe. This method cannot achieve precise control of changes in groundwater levels, resulting in errors in the measurement data. Utility Model Content

[0005] In order to solve the problems existing in the prior art, the utility model aims to provide a weighing lysimeter, which replaces the traditional bucket bottom leakage drainage with groundwater level extraction and accurately controls the changes in groundwater level.

[0006] In order to achieve the above technical objectives and effects, the present invention is implemented through the following technical solutions:

[0007] A weighing lysimeter, comprising a weighing lysimeter body, a lysimeter data acquisition and control device, and a drainage device, wherein the weighing lysimeter body and the drainage device are respectively connected to the lysimeter data acquisition and control device;

[0008] The drainage device includes a box body, a water collecting trough is formed at the bottom of the box body, a water pump is provided on one side of the water collecting trough, the inlet of the water pump is connected to the water collecting trough, the outlet of the water pump is connected to the infusion pipe, the infusion pipe extends from the upper end of the box body, a liquid collecting box is provided on the side wall of the water collecting trough and is connected to it, the water permeating from the weighing lysimeter body is received through the liquid collecting box, and a one-way valve is provided on the upper end of the liquid collecting box.

[0009] Furthermore, the weighing lysimeter body includes an outer cylinder and an inner cylinder arranged inside the outer cylinder, a soil sensor and a weighing mechanism; the weighing mechanism is horizontally arranged on the inner bottom surface of the outer cylinder, the inner cylinder is arranged on the top of the weighing mechanism, and the soil sensor is arranged on the inner cylinder, and the soil state in the inner cylinder can be monitored by the soil sensor; a seepage pipe is provided at the lower end of the inner cylinder, and a transition pipe is provided on the outer cylinder.

[0010] Furthermore, a liquid flow sensor is provided in the transition pipe.

[0011] Furthermore, the soil sensor includes a soil three-parameter sensor and a soil tensiometer.

[0012] Furthermore, the weighing mechanism includes a weighing platform and a weighing sensor arranged on the weighing platform.

[0013] Furthermore, the lysimeter data acquisition and control device includes a support rod and a lysimeter data acquisition and control box arranged on the support rod.

[0014] Furthermore, the lysimeter data acquisition and control device also includes a solar panel, which is fixed to the upper end of the support rod.

[0015] Furthermore, a water level sensor is provided in the liquid collecting box.

[0016] Furthermore, the outer cylinder and the inner cylinder are circular or square.

[0017] Furthermore, the upper edge of the inner tube is provided with a protective edge integrally formed therewith.

[0018] The beneficial effects of the present invention are as follows: the present invention realizes the monitoring of seepage water in the soil by setting a liquid flow sensor, thereby measuring the soil seepage data and improving the measurement of soil evaporation; and by setting a drainage device, the seepage water is collected, and when the water in the drainage device reaches a certain level or is considered to be intervened, the accumulated water can be automatically pumped out, and the changes in the groundwater level can be accurately controlled.

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the description, the following is a detailed description of the preferred embodiments of the present invention with the accompanying drawings. The specific implementation methods of the present invention are given in detail in the following embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the overall structure of the lysimeter of the utility model;

[0022] Figure 2 This is a schematic diagram of the pre-buried main body and drainage device of the weighing lysimeter of the utility model;

[0023] Figure 3 This is a structural diagram of the data acquisition and control device of the utility model lysimeter.

[0024] Explanation of the numbers in the figure: 1. Weighing lysimeter body; 2. Lysimeter data acquisition and control device; 3. Drainage device; 11. Outer cylinder; 12. Inner cylinder; 14. Weighing mechanism; 15. Seepage pipe; 16. Transition pipe; 18. Soil three-parameter sensor; 19. Soil tensiometer; 21. Support rod; 22. Lysimeter data acquisition and control box; 23. Solar panel; 31. Box; 32. Water pump; 33. Liquid collecting box; 34. Liquid infusion pipe; 35. One-way valve; 311. Water collecting tank. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0026] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, upper end, lower end, top, bottom...) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] See also Figure 1 As shown in the figure (label A in the figure represents a soil layer; label B in the figure represents a concrete layer; label C in the figure represents a rammed soil layer), a weighing lysimeter includes a weighing lysimeter body 1, a lysimeter data acquisition and control device 2, and a drainage device 3, wherein the weighing lysimeter body 1 and the drainage device 3 are respectively connected to the lysimeter data acquisition and control device 2;

[0028] See also Figure 2As shown, in this embodiment, the weighing lysimeter body 1 includes an outer cylinder 11 and an inner cylinder 12 arranged in the outer cylinder 11, a soil sensor and a weighing mechanism 14; the weighing mechanism 14 is horizontally arranged on the inner bottom surface of the outer cylinder 11, the inner cylinder 12 is arranged on the top of the weighing mechanism 14, and the soil sensor is arranged on the inner cylinder 12. The soil state in the inner cylinder 12 can be monitored by the soil sensor. The soil sensor includes a soil three-parameter sensor 18 and a soil tensiometer 19. During monitoring, the soil three-parameter sensor The sensor 18 collects soil moisture, electrical conductivity and temperature data, and the soil water tension, soil matrix suction, soil water suction and soil water potential are measured through the soil tensiometer 19; a seepage pipe 15 is provided at the lower end of the inner cylinder 12, and a transition pipe 16 is provided on the outer cylinder 11. A liquid flow sensor (not shown in the figure) is provided in the transition pipe 16; during monitoring, water seeping through the seepage pipe 15 is discharged through the transition pipe 16, and the liquid flow sensor is used to monitor the flow through the transition pipe 16.

[0029] In this embodiment, the outer cylinder 11 and the inner cylinder 12 are round or square, but are limited to the above two shapes, and other shapes can also be used; and a guard edge integrally formed therewith is provided on the upper edge of the inner cylinder 12; the weighing mechanism 14 includes a weighing platform 141 and a weighing sensor 142 provided on the weighing platform 141.

[0030] Continue to see Figure 2 As shown, in this embodiment, the drainage device 3 includes a box body 31, which is connected to the outer cylinder 11, and a water collecting tank 311 is formed at the bottom of the box body 31. A water pump 32 is provided on one side of the water collecting tank 311. The inlet of the water pump 32 is connected to the water collecting tank 311, and the outlet of the water pump 32 is connected to the infusion pipe 34. The infusion pipe 34 extends from the upper end of the box body 31. A liquid collecting box 33 connected to it is provided on the side wall of the water collecting tank 311. The water permeated from the weighing lysimeter body 1 is received through the liquid collecting box 33. A one-way valve 35 is provided at the upper end of the liquid collecting box 33; wherein, the water flowing out through the transition pipe 16 is discharged into the liquid collecting box 33; two groups of water level sensors 35 are provided in the liquid collecting box 33, which are arranged at the upper and lower ends of the liquid collecting box 33, and the water level sensors 35 are respectively connected to the lysimeter data acquisition and control device 2.

[0031] See also Figure 3As shown, in this embodiment, the lysimeter data acquisition and control device 2 includes a support rod 21 and a lysimeter data acquisition and control box 22 arranged on the support rod 21; the weighing mechanism 14, the soil three-parameter sensor 18, the soil tensiometer 19, the liquid flow sensor, the water pump 32 and the water depth measurement sensor are all connected to the lysimeter data acquisition and control box 22; during monitoring, the lysimeter data acquisition and control box 22 receives and processes the data information sent by the weighing mechanism 14, the soil moisture sensor 18, the conductivity sensor 19 and the soil temperature sensor 20, the liquid flow sensor and the water depth measurement sensor, and controls the start and stop of the water pump 32 according to the information sent by the water depth measurement sensor; the lysimeter data acquisition and control device 2 also includes a solar panel 23, which is fixed to the upper end of the support rod 21 and provides power through the solar panel 23. Of course, it is not limited to using the solar panel 23 for power supply, and direct power supply can also be used, or both can be used at the same time.

[0032] The installation method and working principle of this utility model are as follows:

[0033] During installation, the installation point is selected, and the foundation pits for the weighing lysimeter body 1 and the drainage device 3 are excavated respectively. The weighing lysimeter body 1 and the drainage device 3 are placed in the corresponding pits and leveled. At this time, the transition pipe 16 is deep into the box body 31 and can drain water into the box body 31; then the soil is filled into the inner tube 12. In this embodiment, the soil size is: diameter 50.5 cm (area 2000 cm 2 ), depth 80cm; then, after the lysimeter data acquisition control device 2 is fixed by its supporting rod 21, the weighing mechanism 14, the soil moisture sensor 18, the conductivity sensor 19 and the soil temperature sensor 20, the liquid flow sensor, the water pump 32 and the water depth measurement sensor are respectively connected to the lysimeter data acquisition control box 22.

[0034] During monitoring, water contained in the soil within the inner tube 12 seeps out through the seepage pipe 15 and is discharged into the liquid collection box 33 through the transition pipe 16. The liquid flow sensor monitors the flow of water flowing through the transition pipe 16, thereby obtaining soil water seepage data. The weighing mechanism 14 continuously monitors the weight of the soil within the inner tube 12, thereby obtaining detailed data information on changes in soil water content over any time period. Combined with rainfall and seepage data, the amount of water loss in the soil can be determined as evapotranspiration. The soil three-parameter sensor 18 can measure the moisture content, electrical conductivity, and temperature in the soil. By measuring the dielectric constant of the soil, it can directly reflect the actual moisture content of the soil, thereby observing the impact of rainfall on the overall soil.

[0035] Among them, when the water level sensor 35 in the liquid collecting box 33 monitors that the water level reaches the set height, the water pump 32 starts to discharge the water in the liquid collecting box 33, and when it is lower than the set height, the water pump 32 is turned off; or the water pump 32 is directly controlled to start and stop through the lysimeter data acquisition control box 22 to discharge the accumulated water in the water collection tank 311.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A weighing lysimeter, characterized in that: The device comprises a weighing lysimeter body (1), a lysimeter data acquisition and control device (2), and a drainage device (3), wherein the weighing lysimeter body (1) and the drainage device (3) are respectively connected to the lysimeter data acquisition and control device (2); The drainage device (3) includes a box (31), a water collecting trough (311) is formed at the bottom of the box (31), a water pump (32) is provided on one side of the water collecting trough (311), the inlet of the water pump (32) is connected to the water collecting trough (311), and the outlet of the water pump (32) is connected to the infusion pipe (34), and the infusion pipe (34) extends from the upper end of the box (31). A liquid collecting box (33) is provided on the side wall of the water collecting trough (311) and is connected thereto. Water permeating from the weighing lysimeter body (1) is received through the liquid collecting box (33), and a one-way valve (35) is provided on the upper end of the liquid collecting box (33).

2. The gravimetric lysimeter according to claim 1, wherein: The weighing lysimeter body (1) comprises an outer cylinder (11), an inner cylinder (12) arranged in the outer cylinder (11), a soil sensor and a weighing mechanism (14); the weighing mechanism (14) is horizontally arranged on the inner bottom surface of the outer cylinder (11), the inner cylinder (12) is arranged on the top of the weighing mechanism (14), and the soil sensor is arranged on the inner cylinder (12), and the soil state in the inner cylinder (12) can be monitored by the soil sensor; a seepage pipe (15) is arranged at the lower end of the inner cylinder (12), and a transition pipe (16) is arranged on the outer cylinder (11).

3. The gravimetric lysimeter according to claim 2, wherein: A liquid flow sensor is arranged in the transition pipe (16).

4. The gravimetric lysimeter according to claim 2, wherein: The soil sensor comprises a soil three-parameter sensor (18) and a soil tensiometer (19).

5. The gravimetric lysimeter according to claim 1, wherein: The weighing mechanism (14) comprises a weighing platform (141) and a weighing sensor (142) arranged on the weighing platform (141).

6. The gravimetric lysimeter according to claim 1, wherein: The lysimeter data acquisition control device (2) comprises a support rod (21) and a lysimeter data acquisition control box (22) arranged on the support rod (21).

7. The gravimetric lysimeter according to claim 4, wherein: The lysimeter data acquisition and control device (2) further comprises a solar panel (23), and the solar panel (23) is fixed to the upper end of the support rod (21).

8. The gravimetric lysimeter according to claim 1, wherein: A water level sensor (35) is provided in the liquid collecting box (33).

9. The gravimetric lysimeter according to claim 1, wherein: The outer cylinder (11) and the inner cylinder (12) are circular or square.

10. The gravimetric lysimeter according to claim 1 or 5, wherein: The upper edge of the inner cylinder (12) is provided with a protective edge integrally formed therewith.

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