Device for measuring reoxygenation rate of surface layer of reservoir and use method of device

Abstract

The invention discloses a device for measuring the reoxygenation rate of the surface layer of a reservoir and a using method thereof.The device for measuring the reoxygenation rate of the surface layer of the reservoir is characterized in that the device comprises an experimental device, the experimental device comprises a cylinder, at least two buoys and a DO measuring probe, the edge of a top opening of the cylinder is fixed by a top steel coil, the edge of a bottom opening of the cylinder is fixed by a bottom steel coil, the side surface and the bottom of the cylinder are sealed by white polyethylene plastic cloth, and the cylinder is used for collecting surface water of a reservoir. According to the device for measuring the reoxygenation rate of the surface layer of the reservoir and the using method of the device, the device can fully reflect natural actual conditions and simulate the natural wind speed and water speed reoxygenation process, meanwhile, manufacturing is easy, operation is easy, stability and reliability are achieved, experimental data are accurate and reliable, the device is flexible and convenient to carry, flexible combination and adjustment can be achieved according to experimental requirements, and the application range is wide. Wide application prospects are realized.

Description

Technical Field

[0001] The invention relates to the technical field of dissolved oxygen (DO) measurement in water bodies, and in particular to a device for measuring the reoxygenation rate of a reservoir surface layer and a use method thereof. Background Art

[0002] Dissolved oxygen (DO) in water is one of the important indicators for assessing water quality. The sources and sinks of DO in water bodies mainly include surface reoxygenation, phytoplankton photosynthesis, phytoplankton respiration, ammonia nitrogen nitrification, heterotrophic respiration of dissolved organic carbon and oxygen consumption of bottom sediments. Through field in-situ experiments, the parameters of each source and sink process (surface reoxygenation rate, oxygen production rate of net primary productivity, nitrification oxygen consumption rate, organic carbon oxygen consumption rate, respiration oxygen consumption rate, sediment oxygen consumption rate, etc.) can be calculated according to first-order reaction kinetics.

[0003] Existing methods for determining reoxygenation rates mostly use laboratory simulation experiments, which are difficult to truly reflect the reoxygenation process under natural conditions. Therefore, a device and method that can truly simulate the reoxygenation process of the reservoir surface under natural conditions is needed. Summary of the invention

[0004] In response to the problems mentioned in the background technology, the purpose of the present invention is to provide a device for measuring the reoxygenation rate of the surface layer of a reservoir and a method for using it, which can truly simulate the reoxygenation process under natural conditions and accurately measure the reoxygenation rate of the surface layer of the reservoir, so as to solve the problem that the existing reoxygenation rate measurement methods mostly use laboratory simulation experiments, which are difficult to truly reflect the reoxygenation process under natural conditions.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] A device for measuring the reoxygenation rate of the surface layer of a reservoir, comprising an experimental device, wherein the experimental device comprises a cylindrical tube, at least two buoys and a DO measuring probe, wherein:

[0007] The top and bottom of the cylinder are both provided with openings, the top opening edge of the cylinder is fixed by a top steel coil, and the bottom opening edge of the cylinder is fixed by a bottom steel coil, the sides and bottom of the cylinder are sealed by white polyethylene plastic cloth, and the cylinder is used to collect surface water of the reservoir;

[0008] The buoys are fixed on the outer ring of the top steel coil, and the buoys are symmetrically arranged to provide buoyancy for the entire experimental device;

[0009] A cross-shaped iron wire is fixedly installed in the inner circle of the bottom steel coil, the cross-shaped iron wire is located below the white polyethylene plastic cloth at the bottom of the cylindrical tube, and a plumb bob is fixedly installed at the bottom center of the cross-shaped iron wire through a plumb line;

[0010] The DO measuring probe is externally connected to a dissolved oxygen meter, and the DO measuring probe is used to be inserted into the top opening of the cylindrical barrel to monitor the dissolved oxygen changes in the surface water of the reservoir collected in the cylindrical barrel.

[0011] The above-mentioned device for measuring the reoxygenation rate of the surface layer of a reservoir, wherein: the diameter of the cylindrical tube is 1m and the height is 0.5m, which is used to accommodate a sufficient volume of water for experiments.

[0012] The above-mentioned device for measuring the reoxygenation rate of the surface layer of a reservoir, wherein: the diameters of the top steel coil and the bottom steel coil are both 1m.

[0013] The above-mentioned device for measuring the reoxygenation rate of the surface layer of a reservoir, wherein: the experimental device is provided with a control group, in which the top opening of the cylindrical tube in one part of the experimental devices is not covered to simulate the natural reoxygenation process, and the top opening of the cylindrical tube in another part of the experimental devices is sealed with white polyethylene plastic cloth to simulate the non-reoxygenation process.

[0014] The above-mentioned device for measuring the reoxygenation rate of the surface layer of a reservoir, wherein: for the cylindrical tube with a sealed top opening, a small hole is opened on the white polyethylene plastic cloth with a sealed top opening to allow the DO measuring probe to be inserted for monitoring while maintaining the sealing of the inside of the cylindrical tube.

[0015] The above method of using the device for measuring the reoxygenation rate of the surface layer of a reservoir includes the steps of setting up an experimental device, designing experimental controls, recording experimental data, and analyzing the experimental data.

[0016] The above method of using the device for determining the reoxygenation rate of the surface layer of a reservoir, wherein: the step of setting up the experimental device includes fixing the experimental device at a predetermined position in the reservoir to ensure that the experimental device is stable and can be affected by the flow field of the reservoir;

[0017] The step of designing the experimental control comprises setting the top opening of the cylindrical tube in one part of the experimental devices without a cover plate to simulate the natural reoxygenation process, and the top opening of the cylindrical tube in another part of the experimental devices is sealed with a white polyethylene plastic sheet to simulate the non-reoxygenation process;

[0018] For the cylindrical tube with a sealed top opening, a small opening is opened on the white polyethylene plastic sheet with a sealed top opening so as to insert a DO measuring probe for monitoring while maintaining the sealing of the inside of the cylindrical tube.

[0019] The above-mentioned method of using the device for measuring the reoxygenation rate of the surface layer of a reservoir, wherein: the step of recording experimental data includes using a DO measuring probe to record the DO changes of the experimental water body once every hour for 24 hours (day and night).

[0020] The above-mentioned method of using the device for measuring the surface reoxygenation rate of a reservoir, wherein: the step of analyzing the experimental data includes calculating the surface reoxygenation amount and reoxygenation rate based on the changes in water DO during the experiment, combined with the research results on the reoxygenation coefficient of the reservoir water under the combined effects of wind speed and flow field during the study.

[0021] The above method of using the device for measuring the reoxygenation rate of the surface layer of the reservoir, wherein: in the step of analyzing the experimental data, the following calculation formula is used to calculate the reoxygenation amount of the surface layer of the reservoir and the reoxygenation rate of the atmosphere:

[0022]

[0023] D t =DO s -[DO 无盖板 ] t (2)

[0024] D0=DO S -[DO 无盖板 ]0 (3)

[0025]

[0026] Where: K R is the atmospheric reoxygenation rate (d -1 );DO S is the saturated DO concentration (mg / L); is the average oxygen deficit of the water body at the start and end times (mg / L); ΔD is the change in oxygen deficit of the water body at the start and end times (mg / L); Δt is the time difference between the start and end times (d); K1 is the comprehensive oxygen consumption rate of the water body (d -1 ); It is the average concentration of oxygen-consuming substances corresponding to the oxygen consumption rate at the start and end times (mg / L), simplified by converting the BOD5 concentration.

[0027] In summary, the present invention mainly has the following beneficial effects:

[0028] The present invention provides a device for measuring the reoxygenation rate of the surface layer of a reservoir and a method for using the device. The device can fully reflect the actual natural situation and simulate the reoxygenation process of natural wind speed and water speed. At the same time, it is easy to make, simple to operate, stable and reliable, and the experimental data is accurate and reliable. The device is flexible and convenient to carry and can be flexibly combined and adjusted according to experimental needs, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the device for measuring the reoxygenation rate of the surface layer of a reservoir according to the present invention.

[0030] Reference numerals:

[0031] 1. DO measuring probe; 2. Float; 3. Cylindrical tube; 4. Cross wire; 5. Plumb bob; 6. Top steel coil; 7. Bottom steel coil. DETAILED DESCRIPTION

[0032] 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.

[0033] Example 1

[0034] refer to Figure 1 This embodiment provides a device for measuring the reoxygenation rate of the surface layer of a reservoir, including an experimental device, the experimental device including a cylindrical tube 3, at least two buoys 2 and a DO measuring probe 1.

[0035] Among them, the cylindrical tube 3 is used to collect the surface water of the reservoir. The diameter of the cylindrical tube 3 is 1m and the height is 0.5m. It is used to accommodate a sufficient volume of water for the experiment. The top and bottom of the cylindrical tube 3 are both provided with openings. In order to ensure the structural stability of the cylindrical tube 3, the top opening edge of the cylindrical tube 3 is fixed by a top steel coil 6, and the bottom opening edge of the cylindrical tube 3 is fixed by a bottom steel coil 7. The diameters of the top steel coil 6 and the bottom steel coil 7 are both 1m, which can better match the size of the cylindrical tube 3. In order to isolate the influence of the external environment on the experimental water, the sides and bottom of the cylindrical tube 3 are sealed with white polyethylene plastic cloth; the white polyethylene plastic cloth on the sides and bottom of the cylindrical tube 3 is flexible, so that the experimental water body is affected by the reservoir flow field, making the in-situ experiment close to reality.

[0036] The buoy 2 is fixed on the outer ring of the top steel coil 6, and the buoy 2 is symmetrically arranged to provide buoyancy for the entire experimental device;

[0037] Among them, a cross-shaped iron wire 4 is fixedly installed in the inner circle of the bottom steel coil 7, and the cross-shaped iron wire 4 is located below the white polyethylene plastic cloth at the bottom of the cylindrical tube 3, and a plumb bob 5 is fixedly installed at the bottom center of the cross-shaped iron wire 4 through a plumb line. The plumb bob 5 is used to fix the position of the experimental device in the reservoir, and at the same time ensure that the experimental device can swing gently with the water flow and natural wind to simulate the flow field influence under natural conditions;

[0038] The DO measuring probe 1 is externally connected to a dissolved oxygen meter, and the DO measuring probe 1 is used to be inserted into the top opening of the cylindrical tube 3 to monitor the dissolved oxygen changes in the surface water of the reservoir collected in the cylindrical tube 3 .

[0039] Specifically, in this embodiment, the experimental device is provided with 6 control groups, in which the top opening of the cylindrical tube 3 in 3 groups of experimental devices is not covered to simulate the natural reoxygenation process, and the top opening of the cylindrical tube 3 in the other 3 groups of experimental devices is sealed with white polyethylene plastic sheet to simulate the non-reoxygenation process.

[0040] Among them, for the cylindrical tube 3 with a sealed top opening, a small hole is opened on the white polyethylene plastic cloth with a sealed top opening to allow the DO measuring probe 1 to be inserted for monitoring, while maintaining the sealing inside the cylindrical tube 3, that is, pay attention to sealing during operation.

[0041] The dissolved oxygen meter may specifically be a YSI 5500 dissolved oxygen meter, which has the characteristics of high precision, stability and easy operation, and can accurately monitor the changes in dissolved oxygen in water.

[0042] Specifically, the functions of the plumb bob 5 include the following aspects:

[0043] 1. Fixed experimental device location:

[0044] The plumb bob 5 is connected to the bottom of the cylindrical tube 3 in the experimental device through a cross-shaped iron wire 4 to ensure that the experimental device will not drift or move with the water flow and remain in the set experimental position.

[0045] Since lead 5 has a large weight, it can effectively resist the impact of water flow and wind and waves, making the experimental device stable.

[0046] 2. Keep it vertical:

[0047] The gravity of the plumb bob 5 can help the experimental device maintain a vertical state and avoid measurement errors caused by tilt.

[0048] The vertical state helps to maximize the contact area between the water in the experimental device and the external environment, thereby better simulating the reoxygenation process under natural conditions.

[0049] 3. Improve experimental accuracy:

[0050] Fixing the position and keeping it vertical can reduce the interference of external factors on the experimental results and improve the accuracy and reliability of the experimental data.

[0051] The stable experimental device can ensure that the DO measuring probe 1 of the dissolved oxygen meter is always in the correct position during the measurement process, avoiding data deviation caused by position change.

[0052] 4. Adapt to different water depths:

[0053] The length of the plumb bob can be adjusted according to different water depths to ensure that the experimental device can remain stable whether in shallow or deep water areas.

[0054] By adjusting the length of the plumb line, the experimental device can be fixed at different water depths to meet different experimental needs.

[0055] In summary, the role of the plumb bob 5 in this experimental device is to ensure the stability and verticality of the experimental device, thereby improving the accuracy and reliability of the experimental data. Through the gravity of the plumb bob 5, the experimental device can maintain a fixed position in the reservoir, avoid movement caused by water flow and wind and waves, and ensure the authenticity and consistency of the experimental conditions.

[0056] The device for measuring the reoxygenation rate of the reservoir surface layer using the above scheme has the following advantages:

[0057] 1. Fully reflect the natural reality: The experimental device can well simulate the influence of natural wind speed and water speed on the reoxygenation process, making the measurement results closer to the actual situation.

[0058] 2. Easy to make and operate: The experimental device has been precisely designed and debugged. It is easy to make and operate. A control group is set up to improve the accuracy of the test results.

[0059] 3. Stable and reliable: The experimental device has been carefully designed and manufactured, and is stable and reliable, which can ensure the accuracy and reliability of the experimental data.

[0060] 4. Flexible and convenient to carry: The experimental device can be flexibly combined and adjusted according to experimental requirements, and is easy to carry and transport to different experimental locations for use.

[0061] Embodiment 2,

[0062] This embodiment provides a method for using the device for measuring the reoxygenation rate of the surface layer of a reservoir in Embodiment 1, which includes the steps of setting up an experimental device, designing experimental controls, recording experimental data, and analyzing the experimental data.

[0063] Among them, the step of setting up the experimental device includes fixing the experimental device at a predetermined position in the reservoir, ensuring that the experimental device is stable and can be affected by the reservoir flow field and natural wind, and at the same time collecting the surface water of the reservoir to fill the entire device. A submersible pump can be installed inside the cylindrical tube 3, and a hose can be connected to the water inlet of the submersible pump, and the end of the hose away from the submersible pump can be fixed on the outside of the cylindrical tube 3 at a position where it can contact the surface water of the reservoir.

[0064] The steps of designing the experimental control include setting the top opening of the cylindrical tube 3 in the three groups of experimental devices without a cover plate, and the water surface is affected by the atmosphere and wind and waves (with reoxygenation effect) to simulate the natural reoxygenation process, and setting the top opening of the cylindrical tube 3 in the three groups of experimental devices to be sealed with white polyethylene plastic cloth to simulate the non-reoxygenation process;

[0065] For the cylindrical tube 3 with a sealed top opening, a small opening is opened on the white polyethylene plastic cloth with a sealed top opening to allow the DO measuring probe 1 to be inserted for monitoring, while maintaining the sealing inside the cylindrical tube 3, that is, paying attention to sealing during operation.

[0066] The step of recording the experimental data includes using the DO measuring probe 1 to record the DO change of the experimental water body once every hour for 24 hours (day and night).

[0067] Among them, the steps of analyzing experimental data include calculating the surface reoxygenation amount and reoxygenation rate based on the changes in water DO during the experiment and combining the research results on the reoxygenation coefficient of reservoir water under the combined effects of wind speed and flow field during the study.

[0068] The above method of using the device for measuring the reoxygenation rate of the surface layer of the reservoir, wherein: in the step of analyzing the experimental data, the following calculation formula is used to calculate the reoxygenation amount of the surface layer of the reservoir and the reoxygenation rate of the atmosphere:

[0069]

[0070] D t =DO s -[DO 无盖板 ] t (2)

[0071] D0=DO S -[DO 无盖板 ]0 (3)

[0072]

[0073] Where: K R is the atmospheric reoxygenation rate (d -1 );DO S is the saturated DO concentration (mg / L); is the average oxygen deficit of the water body at the start and end times (mg / L); ΔD is the change in oxygen deficit of the water body at the start and end times (mg / L); Δt is the time difference between the start and end times (d); K1 is the comprehensive oxygen consumption rate of the water body (d -1 ); It is the average concentration of oxygen-consuming substances corresponding to the oxygen consumption rate at the start and end times (mg / L), simplified by converting the BOD5 concentration.

[0074] The formula takes into account the atmospheric reoxygenation rate, saturation concentration, average oxygen deficit of the water body at the start and end times, change in oxygen deficit of the water body at the start and end times, start and end time difference, and comprehensive oxygen consumption rate of the water body.

[0075] In summary, the device for measuring the reoxygenation rate of the reservoir surface layer and the method for using the device in this embodiment have the following advantages:

[0076] 1. Fully reflect the natural reality and can well simulate the natural wind speed and water speed reoxygenation. The device with reoxygenation function can completely simulate the natural reoxygenation, and the device without reoxygenation function is in a completely sealed state to avoid the influence of atmospheric reoxygenation;

[0077] 2. Easy to make and operate, stable and reliable. The experimental device has been precisely designed and debugged, and has a control group. It is stable and reliable, and can ensure the accuracy and reliability of the experimental data;

[0078] 3. The device is flexible and convenient to carry. The experimental device has the advantage of being able to be flexibly combined and adjusted according to experimental needs. The device is safe and environmentally friendly.

[0079] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for measuring the reoxygenation rate of the surface layer of a reservoir, characterized in that: include An experimental device, comprising a cylindrical drum (3), at least two floats (2) and a DO measuring probe (1), wherein: The top and bottom of the cylindrical barrel (3) are both provided with openings, the top opening edge of the cylindrical barrel (3) is fixed by a top steel coil (6), and the bottom opening edge of the cylindrical barrel (3) is fixed by a bottom steel coil (7), the side and bottom of the cylindrical barrel (3) are sealed by white polyethylene plastic cloth, and the cylindrical barrel (3) is used to collect surface water of a reservoir; The buoy (2) is fixed on the outer ring of the top steel coil (6), and the buoy (2) is symmetrically arranged to provide buoyancy for the entire experimental device; A cross-shaped iron wire (4) is fixedly installed in the inner circle of the bottom steel coil (7), the cross-shaped iron wire (4) is located below the white polyethylene plastic cloth at the bottom of the cylindrical tube (3), and a plumb bob (5) is fixedly installed at the bottom center of the cross-shaped iron wire (4) via a plumb line; The DO measuring probe (1) is externally connected to a dissolved oxygen meter, and the DO measuring probe (1) is used to be inserted into the top opening of the cylindrical barrel (3) to monitor the change of dissolved oxygen in the surface water of the reservoir collected in the cylindrical barrel (3).

2. A device for measuring the reoxygenation rate of the surface layer of a reservoir according to claim 1, characterized in that: The cylindrical tube (3) has a diameter of 1 m and a height of 0.5 m and is used to contain a sufficient volume of water for conducting experiments.

3. A device for measuring the reoxygenation rate of the surface layer of a reservoir according to claim 2, characterized in that: The diameters of the top steel coil (6) and the bottom steel coil (7) are both 1 m.

4. A device for measuring the reoxygenation rate of the surface layer of a reservoir according to claim 3, characterized in that: The experimental device is provided with a control group, wherein the top opening of the cylindrical tube (3) in one part of the experimental devices is not covered with a cover plate to simulate a natural reoxygenation process, and the top opening of the cylindrical tube (3) in another part of the experimental devices is sealed with a white polyethylene plastic sheet to simulate a non-reoxygenation process.

5. A device for measuring the reoxygenation rate of the surface layer of a reservoir according to claim 4, characterized in that: For the cylindrical tube (3) with a sealed top opening, a small opening is opened on the white polyethylene plastic cloth with a sealed top opening so that the DO measuring probe (1) can be inserted for monitoring while maintaining the sealing of the inside of the cylindrical tube (3).

6. A method for using the device for measuring the reoxygenation rate of the reservoir surface layer according to claim 5, characterized in that: It includes the steps of setting up the experimental apparatus, designing experimental controls, recording experimental data, and analyzing experimental data.

7. The method of using the device for measuring the reoxygenation rate of the surface layer of a reservoir according to claim 6, characterized in that: The step of setting up the experimental device includes fixing the experimental device at a predetermined position in the reservoir to ensure that the experimental device is stable and can be affected by the reservoir flow field; The step of designing the experimental control comprises setting the top opening of the cylindrical tube (3) in one part of the experimental devices without a cover plate to simulate the natural reoxygenation process, and the top opening of the cylindrical tube (3) in another part of the experimental devices is sealed with a white polyethylene plastic sheet to simulate the non-reoxygenation process; For the cylindrical tube (3) with a sealed top opening, a small opening is opened on the white polyethylene plastic cloth with a sealed top opening so that the DO measuring probe (1) can be inserted for monitoring while maintaining the sealing of the inside of the cylindrical tube (3).

8. The method of using the device for measuring the reoxygenation rate of the surface layer of a reservoir according to claim 7, characterized in that: The step of recording experimental data includes using a DO measuring probe (1) to record the DO changes in the experimental water body once an hour for 24 hours.

9. The method of using the device for measuring the reoxygenation rate of the surface layer of a reservoir according to claim 8, characterized in that: The step of analyzing the experimental data includes calculating the surface reoxygenation amount and reoxygenation rate according to the change of water DO during the experiment and the research results on the reoxygenation coefficient of reservoir water under the combined effect of wind speed and flow field during the study.

10. The method of using the device for measuring the reoxygenation rate of the surface layer of a reservoir according to claim 9, characterized in that: In the step of analyzing the experimental data, the following calculation formula is used to calculate the surface oxygenation amount of the reservoir and the atmospheric oxygenation rate: （1） （2） （3） （4） Where: is the atmospheric reoxygenation rate (d -1 ); Saturation Concentration (mg / L); , is the average oxygen deficit of the water body at the start and end times (mg / L); is the change in water oxygen deficit at the start and end times (mg / L); is the start and end time difference (d); is the comprehensive oxygen consumption rate of water body (d -1 ); It is the average concentration of oxygen-consuming substances corresponding to the oxygen consumption rate at the start and end times (mg / L), simplified by converting the BOD5 concentration.

Images