Underground water refilling simulation system for deep confined water aquifer

Abstract

The invention belongs to the technical field of groundwater migration research, and particularly relates to a deep confined water aquifer groundwater refilling simulation system which comprises a sand tank. The simulated permeable layer is arranged in the sand tank, and simulated seawater is filled between the slope surface of the simulated permeable layer and the inner side wall of the sand tank; the water outlet end of the fresh water supplementing mechanism is arranged in the simulated permeable layer, the fresh water supplementing mechanism is used for filling fresh water into the simulated permeable layer, and the fresh water and the simulated seawater form a salty-fresh water interface on the slope surface of the simulated permeable layer; the first adjustable water tank is communicated with the fresh water supplementing mechanism, and the first adjustable water tank is used for adding a tracer agent into the fresh water; and the second adjustable water tank is communicated with the simulated seawater and is used for adjusting the horizontal plane of the simulated seawater. According to the invention, the mechanism of groundwater refilling can be studied more intuitively.

Description

Technical Field

[0001] The invention belongs to the technical field of groundwater migration research, and in particular relates to a groundwater recharge simulation system for a deep confined water aquifer. Background Art

[0002] In areas where groundwater is overexploited, the continued decline in groundwater levels not only exacerbates the contradiction between supply and demand of freshwater resources, but also triggers many geological disasters such as ground subsidence and ground fissures.

[0003] Groundwater recharge is an effective measure to systematically solve water supply security, restore water source exploitation capacity, and improve the groundwater environment.

[0004] Most existing technologies monitor and evaluate groundwater directly based on actual field recharge. This has a long implementation period, makes it difficult to monitor water levels, solutes and formation deformation, and cannot efficiently analyze the changing process of the groundwater impact range.

[0005] Therefore, it is necessary to design a groundwater recharge simulation system for deep confined aquifers to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide a deep confined water aquifer groundwater recharge simulation system to solve the above problems.

[0007] To achieve the above object, the present invention provides the following scheme: a deep confined water aquifer groundwater recharge simulation system, comprising

[0008] sand trough;

[0009] A simulated permeable layer is arranged in the sand trough, and the space between the slope of the simulated permeable layer and the inner wall of the sand trough is filled with simulated seawater;

[0010] A fresh water replenishment mechanism, the water outlet of which is arranged in the simulated permeable layer, and the fresh water replenishment mechanism is used to fill the simulated permeable layer with fresh water, so that the fresh water forms a salty and fresh water interface with the simulated seawater on the slope of the simulated permeable layer;

[0011] A pressure regulating mechanism is arranged at the inner bottom of the sand trough, the pressure regulating mechanism is located below the simulated water-permeable layer and regulates the pressure inside the simulated water-permeable layer;

[0012] a first adjustable water tank, connected to the fresh water replenishment mechanism, the first adjustable water tank being used to add a tracer to the fresh water;

[0013] The second adjustable water tank is connected to the simulated seawater, and the second adjustable water tank is used to adjust the level of the simulated seawater.

[0014] Preferably, the simulated permeable layer includes a plurality of permeable layer components, and the plurality of permeable layer components are stacked from bottom to top in the sand trough, and a plurality of monitoring probes are arranged in the permeable layer components.

[0015] Preferably, the permeable layer assembly includes a permeable sand layer and a weakly permeable layer, the permeable sand layer is arranged at the bottom of the weakly permeable layer, and a plurality of monitoring probes are arranged in the permeable sand layer.

[0016] Preferably, the monitoring probe includes a pressure monitoring probe and a salinity monitoring probe.

[0017] Preferably, the fresh water replenishment mechanism includes a constant flow pump, the inlet end of the constant flow pump is fixedly connected to a water inlet pipe, the outlet end of the constant flow pump is fixedly connected to a water outlet pipe, the water outlet pipe is fixedly connected to one end of a plurality of delivery pipes, the delivery pipes correspond one-to-one to the permeable sand layer and the other end is located in the permeable sand layer.

[0018] Preferably, the outlet end of the first adjustable water tank is connected to the water outlet pipe.

[0019] Preferably, the second adjustable water tank is connected to one end of a seawater pipeline, the other end of the seawater pipeline is connected to the simulated seawater, and the second adjustable water tank is also connected to a drain pipe.

[0020] Preferably, valves are provided on one end of the water outlet pipe connected to the outlet end of the constant flow pump, one end of the delivery pipe connected to the water outlet pipe, the outlet end of the first adjustable water tank, and the seawater pipe.

[0021] Compared with the prior art, the present invention has the following advantages and technical effects:

[0022] The present invention can continuously replenish fresh water into the simulated permeable layer through the fresh water replenishment mechanism, and the replenished fresh water forms a salt-fresh water interface with the simulated seawater. Then, a tracer is added to the fresh water in the simulated permeable layer through the first adjustable water tank, which can intuitively display the trace of groundwater replenishment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0024] Figure 1 It is a schematic diagram of the present invention;

[0025] Figure 2 This is a schematic diagram of Embodiment 2 of the present invention.

[0026] Among them, 1. constant flow pump; 2. first adjustable water tank; 3. valve; 4. delivery pipe; 5. water inlet pipe; 6. permeable sand layer; 7. simulated seawater; 8. second adjustable water tank; 9. monitoring probe; 10. weak permeable layer; 11. salt-fresh water interface; 12. drainage pipe; 13. outlet pipe; 14. seawater pipe; 15. sand trough; 16. perforated steel plate; 17. bottom plate; 18. motor; 19. threaded rod; 20. smooth tube; 21. threaded sleeve. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Embodiment 1:

[0030] Reference Figure 1 As shown, this embodiment provides a deep confined water aquifer groundwater recharge simulation system, including

[0031] Sand trough 15;

[0032] The simulated permeable layer is arranged in the sand tank 15, and the slope of the simulated permeable layer and the inner wall of the sand tank 15 are filled with simulated seawater 7;

[0033] A fresh water replenishment mechanism, the water outlet of which is arranged in the simulated permeable layer, and the fresh water replenishment mechanism is used to fill the simulated permeable layer with fresh water, and the fresh water forms a salt-fresh water interface 11 with the simulated seawater 7 on the slope of the simulated permeable layer;

[0034] A first adjustable water tank 2, connected to the fresh water replenishment mechanism, the first adjustable water tank 2 is used to add a tracer to the fresh water;

[0035] The second adjustable water tank 8 is in communication with the simulated seawater 7 , and is used for adjusting the level of the simulated seawater 7 .

[0036] According to a further optimization scheme, the simulated permeable layer includes a plurality of permeable layer components, and the plurality of permeable layer components are stacked from bottom to top in the sand trough 15, and a plurality of monitoring probes 9 are arranged in the permeable layer components.

[0037] According to a further optimized solution, the permeable layer assembly includes a permeable sand layer 6 and a weakly permeable layer 10 . The permeable sand layer 6 is arranged at the bottom of the weakly permeable layer 10 , and a plurality of monitoring probes 9 are arranged in the permeable sand layer 6 .

[0038] According to a further optimized solution, the monitoring probe 9 includes a pressure monitoring probe and a salinity monitoring probe.

[0039] A further optimized solution is that the fresh water replenishment mechanism includes a constant flow pump 1, the inlet end of the constant flow pump 1 is fixedly connected to a water inlet pipe 5, the outlet end of the constant flow pump 1 is fixedly connected to a water outlet pipe 13, the water outlet pipe 13 is fixedly connected to one end of a plurality of delivery pipes 4, the delivery pipes 4 correspond one-to-one to the permeable sand layer 6 and the other end is located in the permeable sand layer 6.

[0040] To further optimize the solution, the outlet end of the first adjustable water tank 2 is connected to the water outlet pipe 13.

[0041] To further optimize the solution, the second adjustable water tank 8 is connected to one end of a seawater pipe 14 , the other end of the seawater pipe 14 is connected to the simulated seawater 7 , and the second adjustable water tank 8 is also connected to a drain pipe 12 .

[0042] To further optimize the solution, valves 3 are provided on one end of the water outlet pipe 13 connected to the outlet end of the constant flow pump 1 , one end of the delivery pipe 4 connected to the water outlet pipe 13 , the outlet end of the first adjustable water tank 2 , and the seawater pipe 14 .

[0043] The flow rate of the deep water replenished in the permeable sand layer 6 can be controlled by the constant flow pump 1, the water level of the deep water in each layer of the permeable sand layer 6 can be controlled by the first adjustable water tank 2, and the tracer can be added to the deep water in the permeable sand layer 6 to observe the deep water. The second adjustable water tank 8 can adjust the horizontal plane of the simulated seawater 7. The present invention can observe multiple permeable sand layers 6 and weak permeable layers 10 of different thicknesses, and can also more intuitively analyze the hydraulic influence range (introduction influence range) and solute influence range (direct influence range) according to the pressure monitoring probe and the fluorescent tracer placed. At the same time, the displacement process of deep salt water under the replenishment condition can be analyzed through the salt-fresh water interface 11.

[0044] Embodiment 2:

[0045] Reference Figure 2 As shown, the difference between this embodiment and the first embodiment is that it further includes a pressure regulating mechanism, which is arranged at the inner bottom of the sand tank 15. The pressure regulating mechanism is located below the simulated permeable layer and regulates the pressure inside the simulated permeable layer.

[0046] A further optimized solution is that the pressure regulating mechanism includes a plurality of pressure regulating parts. A bottom plate 17 is provided at the bottom end of the sand trough 15. The bottom plate 17 is provided at the bottom end of the permeable sand layer 6 located at the bottom. The fixed end of the pressure regulating part is provided between the bottom plate 17 and the bottom wall of the sand trough 15. The output end of the pressure regulating part is provided between the permeable sand layer 6 and the weakly permeable layer 10.

[0047] A further optimized solution is that the pressure regulating part includes a motor 18, which is arranged between the bottom plate 17 and the bottom wall of the sand trough 15, and the output end of the motor 18 is fixedly connected to the bottom end of a vertically arranged threaded rod 19, and the top end of the threaded rod 19 is threadedly connected to a threaded sleeve 21, and the threaded sleeve 21 is fixedly connected to a perforated steel plate 16, and the perforated steel plate 16 is arranged between the permeable sand layer 6 and the weakly permeable layer 10 of the same permeable layer assembly.

[0048] This embodiment takes three water-permeable layer components and three pressure regulating parts as examples to illustrate the corresponding relationship between the two. The three water-permeable layer components are respectively No. 1 water-permeable layer component, No. 2 water-permeable layer component, and No. 3 water-permeable layer component from top to bottom. The three pressure regulating parts are respectively No. 1 pressure regulating part, No. 2 pressure regulating part, and No. 3 pressure regulating part from left to right. The No. 1 water-permeable layer component corresponds to the No. 1 pressure regulating part, the No. 2 water-permeable layer component corresponds to the No. 2 pressure regulating part, and the No. 3 water-permeable layer component corresponds to the No. 3 pressure regulating part. Two light cylinders 20 are movably sleeved on the outer side of the threaded rod 19 of the No. 1 pressure regulating part. The upper light cylinder 20 is fixed to the weakly permeable layer 10 of the No. 2 water-permeable layer component and the perforated steel plate 1 of the No. 2 pressure regulating part. 6, the light cylinder 20 located at the bottom is fixed on the weak permeable layer 10 of the No. 3 permeable layer component and the perforated steel plate 16 of the No. 3 pressure regulating unit, so that when the motor 18 of the No. 1 pressure regulating unit drives the threaded rod 19 to rotate and adjust the pressure of the permeable sand layer 6 exerted by the permeable steel plate 16, it will not affect the No. 2 permeable layer component and the No. 3 permeable layer component. The difference between the No. 2 pressure regulating unit and the No. 1 pressure regulating unit is that a light cylinder 20 is movably arranged on the outer side of the threaded rod 19 of the No. 2 pressure regulating unit, and the light cylinder 20 is fixedly connected to the weak permeable layer 10 of the No. 3 permeable layer component and the perforated steel plate 16 of the No. 3 pressure regulating unit, while the light cylinder 20 does not need to be arranged on the outer side of the threaded rod 19 of the No. 3 pressure regulating unit.

[0049] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0050] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope of the present invention.

Claims

1. Deep confined water aquifer groundwater recharge simulation system, characterized by: include Sand trough (15); A simulated permeable layer is arranged in the sand trough (15), and the space between the slope of the simulated permeable layer and the inner wall of the sand trough (15) is filled with simulated seawater (7); A fresh water replenishment mechanism, the water outlet of which is arranged in the simulated permeable layer, the fresh water replenishment mechanism is used to fill the simulated permeable layer with fresh water, and the fresh water forms a salt-fresh water interface (11) with the simulated seawater (7) on the slope of the simulated permeable layer; a first adjustable water tank (2), connected to the fresh water replenishing mechanism, the first adjustable water tank (2) being used to add a tracer to the fresh water; The second adjustable water tank (8) is connected to the simulated seawater (7), and the second adjustable water tank (8) is used to adjust the water level of the simulated seawater (7).

2. The deep confined water aquifer groundwater recharge simulation system according to claim 1 is characterized in that: The simulated permeable layer comprises a plurality of permeable layer components, wherein the plurality of permeable layer components are stacked from bottom to top in the sand trough (15), and a plurality of monitoring probes (9) are arranged in the permeable layer components.

3. The deep confined water aquifer groundwater recharge simulation system according to claim 2 is characterized in that: The permeable layer assembly comprises a permeable sand layer (6) and a weakly permeable layer (10), the permeable sand layer (6) is arranged at the bottom end of the weakly permeable layer (10), and a plurality of monitoring probes (9) are arranged in the permeable sand layer (6).

4. The deep confined water aquifer groundwater recharge simulation system according to claim 2, characterized in that: The monitoring probe (9) comprises a pressure monitoring probe and a salinity monitoring probe.

5. The deep confined water aquifer groundwater recharge simulation system according to claim 3, characterized in that: The fresh water replenishment mechanism comprises a constant flow pump (1), the inlet end of the constant flow pump (1) is fixedly connected to a water inlet pipe (5), the outlet end of the constant flow pump (1) is fixedly connected to a water outlet pipe (13), the water outlet pipe (13) is fixedly connected to one end of a plurality of delivery pipes (4), the delivery pipes (4) correspond one to one with the permeable sand layer (6) and the other end is located in the permeable sand layer (6).

6. The deep confined water aquifer groundwater recharge simulation system according to claim 5, characterized in that: The outlet end of the first adjustable water tank (2) is in communication with the water outlet pipe (13).

7. The deep confined water aquifer groundwater recharge simulation system according to claim 6, characterized in that: The second adjustable water tank (8) is connected to one end of a seawater pipeline (14), the other end of which is connected to the simulated seawater (7), and the second adjustable water tank (8) is also connected to a drainage pipe (12).

8. The deep confined water aquifer groundwater recharge simulation system according to claim 7, characterized in that: Valves (3) are provided on one end of the water outlet pipe (13) connected to the outlet end of the constant flow pump (1), one end of the delivery pipe (4) connected to the water outlet pipe (13), the outlet end of the first adjustable water tank (2), and the seawater pipe (14).

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