Experimental device for measuring karst carbon sink process under controllable environmental conditions

Abstract

The utility model discloses an experimental device for measuring a karst carbon sink process under controllable environmental conditions. The device comprises three parts, namely an environmental condition control device, a karst system simulation device and a monitoring device. Wherein the environmental condition control device mainly comprises a liquid storage tank, a peristaltic pump, a valve, a rainfall sprayer and a biochemical incubator. The karst system simulation device mainly comprises permeable hoses with different diameters, karst caves with different sizes and permeable geotextile. The monitoring device mainly comprises an integrated detection probe, a data recorder and a computer. The device disclosed by the utility model can simulate various temperature, humidity, illumination and rainfall conditions indoors, the simulated karst system is close to the natural environment, the dynamic change of CO2 in the karst system can be continuously observed for a long time, and a reliable observation and research idea is provided for the fundamental research of carbon metabolism and carbon circulation.

Description

Technical Field

[0001] The utility model relates to the technical field of karst carbon sink simulation, in particular to an experimental device for measuring the karst carbon sink process with controllable environmental conditions. Background Technique

[0002] At present, the research methods for carbon sink amount in karst areas mainly include geological survey, geochemical analysis, model method, etc. Geological survey studies the geological characteristics, rock types, soil components, etc. of karst areas through field investigation and sampling analysis, and then evaluates their carbon adsorption and storage capabilities. However, it requires a large amount of human cost, and is limited by the representativeness of sampling points and analysis accuracy, making it difficult to comprehensively reflect the carbon sink status of karst areas; Although geochemical analysis can control the carbon in the carbonate rock dissolution process in a specific basin, this method ignores the carbon sink amount contributed by exogenous water dissolution. It only analyzes the karst area as a closed system, without fully considering the influence of hydrogeological interaction inside and outside the basin on the carbon cycle. The model method can be used to study the karst carbon sink amount in a larger area, but when using the model to estimate the carbon sink flux, there may be uncertainties in aspects such as model parameterization and assumption conditions, affecting the accuracy of the evaluation results. These methods do not comprehensively consider environmental factors such as temperature, humidity, light, and rainfall conditions, and lack the monitoring and evaluation of parameters such as the karst system, especially temperature, pH, conductivity, and HCO 3 - concentration, and at the same time, the description of the karst system is not precise enough. Content of the Utility Model

[0003] The utility model provides an experimental device for measuring the karst carbon sink process with controllable environmental conditions, which can accurately simulate a complex karst system and monitor the karst carbon sink process by controlling different environmental conditions.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0005] An experimental device for measuring the karst carbon sink process with controllable environmental conditions, comprising: an environmental condition control device, a karst system simulation device, and a monitoring device;

[0006] The environmental condition control device includes a rainfall storage tank, a peristaltic pump, a valve, a rainfall sprinkler, and a biochemical incubator;

[0007] The rainfall storage tank is arranged at one end of a water pipe, and the peristaltic pump, the valve, and the rainfall sprinkler are sequentially arranged at the other end of the water pipe, and the rainfall sprinkler is placed inside the biochemical incubator;

[0008] The cylinder body is placed inside a biochemical incubator. A rainfall sprinkler is arranged above the cylinder body. Inside the cylinder body, there are a karst system simulation device and a rock stratum simulation device. A water pipe is externally connected to the bottom of the cylinder body and is connected to a seepage liquid storage tank;

[0009] The monitoring device is used to monitor the temperature, pH, conductivity, and HCO 3 - concentration at different positions inside the cylinder body.

[0010] Preferably, the monitoring device includes a number of integrated monitoring probes, a data recorder, and a computer. The integrated monitoring probes are respectively arranged at different heights inside the cylinder body; the integrated monitoring probes are connected to the data recorder and the computer.

[0011] Preferably, the integrated monitoring probe includes a temperature monitoring probe, a pH monitoring probe, a conductivity monitoring probe, and an HCO 3 - monitoring probe.

[0012] Preferably, the karst system simulation device includes a number of first permeable hoses, a number of second permeable hoses, and a number of transparent engineering plastic karst caves; the sizes of the karst caves are randomly set.

[0013] Preferably, the second permeable hoses are connected to each other to form a karst cave group for each of the transparent engineering plastic karst caves.

[0014] Preferably, the rock stratum simulation device includes a soil layer, a carbonate rock stratum, and a permeable geotextile from top to bottom.

[0015] Preferably, the karst cave group is placed in the carbonate rock stratum, and the first permeable hoses are randomly arranged in the carbonate rock stratum above the karst cave group and close to the soil layer to simulate a karst fracture zone.

[0016] Preferably, vegetation is laid above the soil layer, and the gravel particle size of the carbonate rock stratum is larger than the steel bar arrangement spacing;

[0017] The permeable geotextile is laid on steel bars arranged in a cross-grid structure at equal intervals, and PVC pipes are sleeved on the outer surfaces of the steel bars.

[0018] Preferably, the cylinder body is made of opaque glass material; the height-diameter ratio of the cylinder body is 1:1 to 4:1.

[0019] Preferably, the diameter of the first permeable hose is smaller than the diameter of the second permeable hose.

[0020] A method for using an experimental device for measuring the karst carbon sink process with controllable environmental conditions as described above includes the following steps:

[0021] 1) Collect soil and carbonate rock samples by stratification from the research area;

[0022] 2) Fill the bottom of the cylinder with a gravel layer to simulate the saturated aquifer, and lay a permeable geotextile on the top of the gravel layer; fill the soil and carbonate rock samples in the study area in sequence according to the stratigraphic order above the permeable geotextile to construct a soil layer and a carbonate rock layer. When laying the carbonate rock layer, put a karst cave group and several first permeable hoses from bottom to top to simulate the karst structure, and lay vegetation above the soil layer;

[0023] 3) Place the cylinder laid in step 2) in a biochemical incubator, and adjust the set values of the temperature, humidity and light intensity of the incubator to enable the vegetation above the soil layer to gradually adapt to the artificially created conditions;

[0024] 4) Connect the valve, peristaltic pump, and seepage storage tank to the cylinder in the biochemical incubator through a water pipe, connect the valve, peristaltic pump, and rainfall storage tank to the rainfall nozzle in the biochemical incubator, and place the rainfall nozzle at a height of 15 cm to 30 cm above the cylinder;

[0025] 5) Design the rainfall intensity and rainfall time according to the common rainfall patterns in the experiment, and evenly leach the simulated rainfall solution in the rainfall storage tank into the soil layer filled in the cylinder through the rainfall nozzle; adjust the flow rate of the peristaltic pump to control the rising or falling rate of the water level in the cylinder to be consistent with the field observation results, and transfer the water seeping to the bottom of the cylinder to the seepage storage tank;

[0026] 6) During the simulation process, use an integrated monitoring probe to monitor the temperature, pH, conductivity and HCO 3 - concentration at different depths in real time.

[0027] Compared with the prior art, the beneficial effects achieved by the present utility model are as follows: The present invention considers the role played by the karst fracture zone and the karst cave group in the whole karst carbon sink, simulates the karst fracture zone and the karst cave group through a simulated karst system, which is more in line with the complex karst structure in the actual situation, can simulate various temperature, humidity, light and rainfall conditions indoors, the simulated karst system is close to the natural environment, and can continuously observe the dynamic changes of CO 2 in the karst system for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0029] Figure 1 is a schematic structural diagram of an experimental device for measuring the karst carbon sink process with controllable environmental conditions of the present utility model;

[0030] In the figure: 1. Rainfall storage tank; 2. Peristaltic pump; 3. Valve; 4. Integrated monitoring probe; 5. Fine permeable hose; 6. Coarse permeable hose; 7. Karst cave; 8. Permeable geotextile; 9. Cylinder; 10. Biochemical incubator; 11. Rainfall sprinkler; 12. Soil layer; 13. Data recorder; 14. Computer; 15. Seepage storage tank. Specific implementation mode

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] Embodiment 1

[0033] The present invention provides a technical solution: An experimental device for measuring the karst carbon sequestration process with controllable environmental conditions, including: an environmental condition control device, a karst system simulation device, and a monitoring device;

[0034] The environmental condition control device includes a rainfall storage tank 1, a peristaltic pump 2, a valve 3, a rainfall sprinkler 11, and a biochemical incubator 10;

[0035] The monitoring device includes a number of integrated monitoring probes 4, a data recorder 3, and a computer 14. The integrated monitoring probe 4 includes a temperature monitoring probe, a pH monitoring probe, a conductivity monitoring probe, and an HCO 3 - Monitoring probe;

[0036] The karst system simulation device includes a number of first permeable hoses 5, a number of second permeable hoses 6, and a number of transparent engineering plastic karst caves 7. The second permeable hoses 6 are connected to each transparent engineering plastic karst cave 7 to form a karst cave group;

[0037] The rock layer simulation device includes a soil layer 12, a carbonate rock layer, and a permeable geotextile 8 from top to bottom;

[0038] The rainfall storage tank 1 is arranged at one end of the water pipe. The other end of the water pipe is successively provided with the peristaltic pump 2, the valve 3, and the rainfall sprinkler 11. The rainfall sprinkler 11 is placed inside the biochemical incubator 10. The rainfall sprinkler 11 is arranged above the cylinder 9. The karst system simulation device and the rock layer simulation device are arranged inside the cylinder 9. The bottom of the cylinder 9 is externally connected to a water pipe and is connected to the seepage storage tank 15. The integrated monitoring probes 4 are respectively arranged at different heights in the cylinder 9; The integrated monitoring probe 4 is connected to the data recorder 13 and the computer 14.

[0039] Among them, the karst cave group is placed in the carbonate rock layer. The first permeable hose 5 is randomly arranged in the carbonate rock layer above the karst cave group and close to the soil layer 12 to simulate the karst fracture zone. Vegetation is laid above the soil layer 12. The gravel particle size of the carbonate rock layer is larger than the steel bar arrangement spacing; the permeable geotextile 8 is laid on the steel bars arranged in a cross-grid structure at equal intervals, and the outer surface of the steel bar is sleeved with a PVC pipe.

[0040] The cylinder 9 is made of opaque glass material; the height-diameter ratio of the cylinder 9 is 1:1 to 4:1, and the diameter of the first permeable hose 5 is smaller than the diameter of the second permeable hose 6.

[0041] Embodiment 2

[0042] A method for using an experimental device for measuring the karst carbon sequestration process with controllable environmental conditions according to the present utility model includes the following steps:

[0043] 1) Collect soil and carbonate rock samples by stratification from the research area;

[0044] 2) Fill the bottom of the cylinder with a gravel layer to simulate the saturated layer, and lay a permeable geotextile on the top of the gravel layer; sequentially fill the soil and carbonate rock samples in the research area above the permeable geotextile according to the stratigraphic sequence of the research area. When laying the carbonate rock layer, put the karst cave group and several fine permeable hoses from bottom to top in sequence to simulate the karst structure, and lay vegetation above the soil layer;

[0045] 3) Place the laid cylinder in a biochemical incubator, and adjust the set values of the temperature, humidity and light intensity of the incubator to make the vegetation above the soil layer gradually adapt to the artificially created conditions;

[0046] 4) Connect the valve, peristaltic pump, and seepage storage tank to the cylinder in the biochemical incubator through a water pipe, connect the valve, peristaltic pump, and rainfall storage tank to the rainfall nozzle in the biochemical incubator, and place the rainfall nozzle at a height of 15 cm to 30 cm above the cylinder;

[0047] 5) Design the rainfall intensity and rainfall time according to the common rainfall patterns in the test, and evenly leach the simulated rainfall solution in the rainfall storage tank into the soil layer filled in the cylinder through the rainfall nozzle; and adjust the flow rate of the peristaltic pump to control the rising or falling rate of the water level in the cylinder to be consistent with the field observation results, and transfer the water seeping to the bottom of the cylinder to the seepage storage tank;

[0048] 6) During the simulation process, use the integrated monitoring probe to monitor the temperature, pH, conductivity and HCO 3 - concentration at different depths in real time.

[0049] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0050] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An experimental device for measuring karst carbon sink process with controllable environmental conditions, characterized in that , including: environmental condition control device, karst system simulation device, monitoring device; The environmental condition control device comprises a rainfall liquid storage tank (1), a peristaltic pump (2), a valve (3), a rainfall nozzle (11) and a biochemical incubator (10); The rainfall liquid storage tank (1) is arranged at one end of a water pipe, and the other end of the water pipe is provided with the peristaltic pump (2), the valve (3) and the rainfall nozzle (11) in sequence, and the rainfall nozzle (11) is placed in a biochemical incubator (10); The cylinder (9) is placed in a biochemical culture box (10), a rainfall nozzle (11) is arranged above the cylinder (9), a karst system simulation device and a rock formation simulation device are arranged inside the cylinder (9), and an external water pipe is connected to a seepage liquid storage tank (15) at the bottom of the cylinder (9); The monitoring device is used to monitor the temperature, pH, conductivity and HCO3 at different positions in the cylinder (9). - concentration.

2. The experimental device for measuring karst carbon sink process with controllable environmental conditions according to claim 1, characterized in that The monitoring device comprises a plurality of integrated monitoring probes (4), a data recorder (13) and a computer (14), wherein the integrated monitoring probes (4) are respectively arranged at different heights in the cylinder (9); the integrated monitoring probes (4) are connected to the data recorder (13) and the computer (14).

3. The experimental device for measuring karst carbon sink process with controllable environmental conditions according to claim 2, characterized in that The integrated monitoring probe (4) includes a temperature monitoring probe, a pH monitoring probe, a conductivity monitoring probe and an HCO3 - Monitoring probe.

4. The experimental device for measuring karst carbon sink process with controllable environmental conditions according to claim 1, characterized in that The karst system simulation device comprises a plurality of first water-permeable hoses (5), a plurality of second water-permeable hoses (6), and a plurality of transparent engineering plastic karst caves (7).

5. The experimental device for measuring karst carbon sink process with controllable environmental conditions according to claim 4, characterized in that The second water-permeable hose (6) connects each transparent engineering plastic cave (7) to form a cave group.

6. The experimental device for measuring karst carbon sink process with controllable environmental conditions according to claim 5, characterized in that The rock formation simulation device comprises, from top to bottom, a soil layer (12), a carbonate rock layer and a permeable geotextile (8).

7. The experimental device for measuring karst carbon sink process with controllable environmental conditions according to claim 6, characterized in that The cave group is placed in the carbonate rock layer, and the first permeable hose (5) is randomly arranged in the carbonate rock layer above the cave group and close to the soil layer (12) to simulate the karst fracture zone.

8. The experimental device for measuring karst carbon sink process with controllable environmental conditions according to claim 6, characterized in that , vegetation is laid on top of the soil layer (12), and the gravel particle size of the carbonate rock layer is larger than the spacing between the steel bars; The permeable geotextile (8) is laid on steel bars arranged at equal intervals in a cross grid structure, and the outer surface of the steel bars is covered with PVC pipes.

9. The experimental device for measuring karst carbon sink process with controllable environmental conditions according to claim 1, characterized in that The cylinder (9) is made of opaque glass material; the height-to-diameter ratio of the cylinder (9) is 1:1 to 4:

1.

10. The experimental device for measuring karst carbon sink process with controllable environmental conditions according to claim 4, characterized in that , the diameter of the first water-permeable hose (5) is smaller than the diameter of the second water-permeable hose (6).

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