CN114808834A - Device and method for simulating low-oxygen water body reoxygenation process of tidal reciprocating flow river channel - Google Patents
Device and method for simulating low-oxygen water body reoxygenation process of tidal reciprocating flow river channel Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 487
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 87
- 239000001301 oxygen Substances 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 47
- 230000008569 process Effects 0.000 title claims abstract description 31
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 54
- 238000004088 simulation Methods 0.000 claims abstract description 47
- 238000002360 preparation method Methods 0.000 claims abstract description 27
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 44
- 206010021143 Hypoxia Diseases 0.000 claims description 19
- 230000000630 rising effect Effects 0.000 claims description 16
- 150000003839 salts Chemical class 0.000 claims description 13
- 230000008859 change Effects 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 7
- 230000004888 barrier function Effects 0.000 claims description 5
- 230000001146 hypoxic effect Effects 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 4
- 239000012153 distilled water Substances 0.000 claims description 4
- 238000011160 research Methods 0.000 claims description 4
- 239000012267 brine Substances 0.000 claims description 3
- 208000018875 hypoxemia Diseases 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000007954 hypoxia Effects 0.000 description 10
- 238000001514 detection method Methods 0.000 description 3
- 238000013517 stratification Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000036461 convulsion Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 206010002660 Anoxia Diseases 0.000 description 1
- 241000976983 Anoxia Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000007953 anoxia Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004173 biogeochemical cycle Methods 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- E02B1/00—Equipment or apparatus for, or methods of, general hydraulic engineering, e.g. protection of constructions against ice-strains
- E02B1/02—Hydraulic models
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Abstract
The invention discloses a device and a method for simulating a low-oxygen water body reoxygenation process of a tidal reciprocating flow river channel, and the device comprises an upstream flow control device, a middle water tank device and a downstream tidal flow water level control device, wherein the upstream flow control device comprises a low-oxygen water preparation water tank, an upstream water level control water tank and a rectangular thin-wall weir, the water preparation water tank is connected with the upstream water level control water tank through a connecting pipe, a water-proof baffle is arranged in the upstream water level control water tank, the middle water tank device comprises a water tank body, a flow velocity measuring device is arranged in the water tank body, a wave-breaking grid is arranged on the left side of the flow velocity measuring device, and the downstream tidal flow water level control device comprises a downstream tidal water level control water tank, a return water tank, a variable frequency water pump, a compensation water tank and a tidal return simulation water tank; the method is simple to operate, the actual measurement data or the hydrodynamic simulation result is used as the boundary condition, so that the simulation result is more accurate, the manual labor intensity is low, and the water resource is saved.
Description
Technical Field
The invention relates to the technical field of tidal reciprocating flow river channel simulation devices, in particular to a device and a method for simulating a low-oxygen water body reoxygenation process of a tidal reciprocating flow river channel.
Background
The dissolved oxygen has great influence on the ecological systems of the ocean and the estuary and the biogeochemical cycle, and has important significance for maintaining healthy aquatic ecological systems. Under the influence of factors such as water stratification caused by sea and land natural conditions, water stability, salinity gradient and temperature gradient, hypoxia and anoxia phenomena exist all the time in the whole geological period, such as petroleum reserves and petroleum-rich areas formed in the geological change process, but with the enhancement of human interference activities, the dissolved oxygen in many estuaries and near-shore areas is reduced to the lowest historical value and presents a deterioration trend. When the rivers and the oceans are in hypoxia and anoxic for a long time, phytoplankton in the water ecological system can be fatally damaged, and settled organic matters are subjected to anaerobic decomposition, so that the water quality is deteriorated and the water ecological system is lost. The research on the on-way reaeration mechanism of the low-oxygen water body in the tidal reciprocating flow estuary area has important significance for exploring the low-oxygen generation mechanism and improving the low-oxygen problem.
The key point of the simulation of the process of the on-way reoxygenation of the hypoxic water body in the tidal reciprocating current estuary area lies in that the model can invert the hydrodynamic force condition of the natural river, the form of the natural river is made into a scale model, and the tidal reciprocating current phenomenon of the natural river is recurred through the scale reduction of the water level, the flow velocity and the time, namely the tidal reciprocating current simulation. Most of current water environment models lack refined boundary conditions, and the reoxygenation coefficient or empirical formula adopted in modeling has a large error on estuary water area affected by tidal reciprocating flow, so that the model is not suitable for on-way reoxygenation process research of the hypoxic water body in the water area. If the method of field actual measurement is adopted, time and labor are wasted. The on-way reoxygenation process of the hypoxic water body under the conditions of different flow rates and water depths of a tidal reciprocating flow riverway is simulated by using a more intuitive physical model and combining long-sequence field synchronous monitoring data or hydrodynamic model simulation results as boundary conditions, and is not reported yet.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a device and a method for simulating the process of reoxygenation of a low-oxygen water body of a tidal reciprocating flow river channel.
In order to achieve the purpose, the invention provides the following technical scheme: a device and a method for simulating a low-oxygen water body reoxygenation process of a tidal reciprocating flow river channel comprise an upstream flow control device, a middle water tank device and a downstream tidal flow water level control device, wherein the upstream flow control device comprises a low-oxygen water preparation water tank, an upstream water level control water tank and a rectangular thin-wall weir, the water preparation water tank is connected with the upstream water level control water tank through a connecting pipe, a water-proof baffle is arranged in the upstream water level control water tank, the middle water tank device comprises a water tank body, a flow velocity measuring device is arranged in the water tank body, a wave-eliminating grid is arranged on the left side of the flow velocity measuring device, the downstream tidal flow water level control device comprises a downstream tidal water level control water tank, a return water tank, a variable frequency water pump, a compensating water tank and a tidal return simulation water tank, the downstream tidal return water level control water tank is connected with the tidal return simulation water tank through a connecting pipe, the tide backflow simulation water tank is connected with the compensation water tank through a connecting pipe, the backflow water tank is connected with the compensation water tank through a variable frequency water pump and is connected with the downstream tide water level control water tank through a connecting pipe, the upper end of the water tank body is connected with the upstream water level control water tank through a rectangular thin-wall weir, a water flow baffle is arranged on the rectangular thin-wall weir at the joint, the lower end of the water tank body is connected with the downstream tide water level control water tank, and a dissolved oxygen measuring device II is arranged in the water tank body.
Furthermore, the low-oxygen water preparation water tank, the upstream water level control water tank, the downstream tide water level control water tank, the return water tank, the compensation water tank and the tide return simulation water tank are all provided with water level scale marks, overflow pipes are arranged at the bottoms of the upstream water level control water tank and the return water tank, and valves are arranged on the overflow pipes.
Furthermore, the downstream tide water level control water tank is provided with a tide lowest water level line and a tide highest water level line, and the inner wall of the downstream tide water level control water tank is provided with a wave dissipation inclined plate.
Furthermore, a salinity measuring device and a dissolved oxygen measuring device III are connected to the compensation water tank.
Further, all be provided with air barrier film on the surface of water of oxygen water preparation water tank and upper reaches water level control water tank, prevent that hypoxia water surface produces reoxygenation through air barrier film in the water tank and influence the analog result with the air contact, be connected with dissolved oxygen survey device I on the oxygen water preparation water tank, be provided with the inlet tube on the oxygen water preparation water tank.
Furthermore, dissolved oxygen survey device II sets up to 4, and the position diverse that dissolved oxygen survey device II set up, can survey tidal current river course hypoxemia water body dissolved reoxygenation situation of change through dissolved oxygen survey device II, upstream flow control device is to the control of the flow of leaking down through the inflow of hypoxemia water preparation water tank and the upper and lower twitch regulation of water proof baffle in the upstream water level control water tank and realize, the water of leaking down flows into the basin cell body through rectangle thin wall weir, and then calculates the flow of leaking down.
Compared with the prior art, the invention has the beneficial effects that:
the water level height of the upstream water level control water tank is changed, and the on-way reoxygenation process condition of the low-oxygen water body of the river under different upstream discharge flows can be simulated.
The water yield of the compensation water tank is changed, and the on-way reoxygenation change rule of the low-oxygen water body of the river under the conditions of different tide water levels of the lower boundary can be simulated.
The salinity adding amount of the compensation water tank is changed, and the on-way reoxygenation change rule of the low-oxygen water body of the river under the condition that salts with different concentrations on the lower boundary are traced upwards can be simulated.
The method is simple to operate, the actual measurement data or the hydrodynamic simulation result is used as the boundary condition, so that the simulation result is more accurate, the labor intensity is low, the salt water of the downstream water tank is recycled, the water resource is saved, and the use cost of the device is reduced.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
In the figure: 1 water inlet pipe, 3 low-oxygen water preparation water tanks, 5 air barrier membranes, 6 dissolved oxygen determination devices I, 7 gates II, 9 upstream water level control water tanks, 10 water-stop baffles, 11 overflow pipes, 12 valves II, 15 rectangular thin-wall weirs, 16 water flow baffles, 17 water tank bodies, 18 wave-eliminating grids, 19 flow rate determination devices, 20 dissolved oxygen determination devices II, 21 downstream tide water level control water tanks, 22 wave-eliminating inclined plates, 24 tide minimum water level lines, 25 tide maximum water level lines, 27 gates I, 28 valves I, 30 tide backflow simulation water tanks, 32 valves III, 34 salinity determination devices, 35 dissolved oxygen determination devices III, 37 compensation water tanks, 40 variable-frequency water pumps and 42 backflow water tanks.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, the present invention provides a technical solution: a device and a method for simulating a tidal reciprocating flow river channel hypoxia water body reoxygenation process comprise an upstream flow control device, a middle water tank device and a downstream tidal flow water level control device, wherein the upstream flow control device comprises a hypoxia water preparation water tank 3, an upstream water level control water tank 9 and a rectangular thin-wall weir 15, the water preparation water tank 3 is connected with the upstream water level control water tank 9 through a connecting pipe, air barrier films 5 are arranged on the water surfaces of the hypoxia water preparation water tank 3 and the upstream water level control water tank 9, a dissolved oxygen measuring device I6 is connected onto the hypoxia water preparation water tank 3, a water inlet pipe 1 is arranged on the hypoxia water preparation water tank 3, a water-proof baffle plate 10 is arranged in the upstream water level control water tank 9, the middle water tank device comprises a water tank body 17, a flow rate measuring device 19 is arranged in the water tank body 17, a wave eliminating grid 18 is arranged on the left side of the flow rate measuring device 19, and the downstream tidal water level flow water level control device comprises a downstream tidal control water level control water tank 21, The device comprises a return water tank 42, a variable frequency water pump 40, a compensation water tank 37 and a tide return simulation water tank 30, wherein a downstream tide water level control water tank 21 is connected with the tide return simulation water tank 30 through a connecting pipe, the downstream tide water level control water tank 21 is provided with a lowest tide water level line 24 and a highest tide water level line 25, the inner wall of the downstream tide water level control water tank 21 is provided with a wave-dissipating inclined plate 22, the tide return simulation water tank 30 is connected with the compensation water tank 37 through a connecting pipe, the compensation water tank 37 is connected with a salinity measuring device 34 and a dissolved oxygen measuring device III 35, the salinity measuring device 34 monitors the effluent concentration in real time, if the effluent concentration does not meet the requirement, a valve is immediately closed to ensure that the boundary condition of a model is real and accurate, the return water tank 42 is connected with the compensation water tank 37 through the variable frequency water pump 40, and the return water tank 42 is connected with the downstream tide water level control water tank 21 through a connecting pipe, the upper end of the water tank body 17 is connected with the upstream water level control water tank 9 through a rectangular thin-wall weir 15, a water flow baffle 16 is arranged on the rectangular thin-wall weir 15 at the joint, the lower end of the water tank body 17 is connected with a downstream tide water level control water tank 21, a dissolved oxygen determination device II 20 is arranged in the water tank body 17, the number of the dissolved oxygen determination devices II 20 is 4, and the positions of the dissolved oxygen determination devices II 20 are different.
The low-oxygen water preparation water tank 3, the upstream water level control water tank 9, the downstream tide water level control water tank 21, the return water tank 42, the compensation water tank 37 and the tide return simulation water tank 30 are all provided with water level scale marks, the bottoms of the upstream water level control water tank 9 and the return water tank 42 are both provided with an overflow pipe 11, and the overflow pipe 11 is provided with a valve.
The wave-breaking grid 18 and the wave-breaking sloping plate 22 can effectively counteract the influence of non-natural hydraulic impact formed by the water flow impacting the wall of the tank.
And (3) tidal current simulation calibration: the rising and falling tidal water quantity and period are controlled by adjusting the height of the water level of the tidal backflow simulation water tank 30 and the water level of the downstream tidal backflow simulation water tank to control the water outlet valve 27 of the water tank; the flow rate of the return water is controlled by adjusting the variable frequency water pump 40 and the compensating water tank valve 39; the height of a water stop plate 10 in the upstream water level control water tank and the lower water discharge amount of a water outlet pipe valve 7 of the low-oxygen water preparation water tank are adjusted. The flow velocity measuring device 19 and the dissolved oxygen measuring device 20 in the water tank body are used for measuring the reoxygenation change conditions of the low-oxygen water body at different positions of the water tank, and the reoxygenation change conditions are compared with actual detection data for verification.
A method for simulating a low-oxygen water body reoxygenation process of a tidal reciprocating flow river channel is realized by the following steps:
selecting boundary condition parameters: obtaining upstream and downstream discharge flow, fluctuation tide cycle water level height, downstream boundary salinity, river channel and upstream and downstream boundary water body dissolved oxygen content as design hydrological conditions by combining field synchronous monitoring data or hydrodynamic model simulation results with the formula, and converting parameters according to a design scale;
preparation before simulation: adding sufficient distilled water into a low-oxygen water preparation water tank 3 through a water inlet pipe 1, preparing the low-oxygen water according to the method, detecting the dissolved oxygen content by a dissolved oxygen detection device I6 to meet a specified value, adding quantitative distilled water into a compensation water tank 37, adding salt according to a formula to prepare brine, and monitoring the salinity value by a salinity detection device 34 to meet the specified value;
simulating the unidirectional flow of the river channel: the gate II 7 on the water outlet pipe of the low-oxygen water preparation water tank 3 is opened, the water-stop baffle 16 is pulled open at the same time, low-oxygen water enters the downstream tide water level control water tank 21 after passing through the upstream water level control water tank 9 and the water tank body 17 in sequence, the water-stop baffle 16 is pulled down when the water level of the water tank water body reaches the normal water level, the water-stop baffle 16 is pulled open when the water level of the upstream water level control water tank 9 reaches the specified value, the valve I28 on the water outlet pipe of the downstream tide water level control water tank 21 is opened at the same time, the reoxygenation change condition of the low-oxygen water body in the unidirectional flow of the river channel is measured, and reference is provided for the research on the reoxygenation process of the low-oxygen water body in the reciprocating flow of the tide.
Tidal current simulation: closing the valve I28 and opening the water outlet gate I27 of the tidal backflow simulation water tank 30, reducing the water outlet flow rate due to the reduction of the water level of the tidal backflow simulation water tank 30, when the water outlet flow rate is zero, the water level of the downstream tidal water level control water tank 21 reaches the highest tidal level line 25, closing the gate I27, at this time, the tidal fluctuation is caused to occur, after the tidal fluctuation is caused to occur, opening the valve I28 on the water outlet pipe of the downstream tidal water level control water tank 21, allowing the falling tidal water to flow into the backflow water tank 42, when the water level of the downstream tidal water level control water tank 21 is reduced from the highest tidal level line to the lowest tidal level line 24, closing the valve I28, at this time, the tidal fluctuation is caused to occur, during the tidal fluctuation is caused to occur, adjusting the variable frequency water pump 40 according to the lower fluctuating tidal volume during the tidal fluctuation, allowing the backflow water tank 42 to flow into the compensation water tank 37, then closing the variable frequency water pump 40, and calibrating the salinity and the dissolved oxygen concentration in the water body by the method, after the salinity measuring device 34 and the dissolved oxygen measuring device III 35 measure that the water level meets the specified value, the valve III 32 is opened, the compensated brine flows into the tide backflow simulation water tank 30, the downstream tide water level flow control device is adjusted in a circulating mode, the tide backflow process can be simulated, and when the water levels of the upstream water level control water tank 9 and the backflow water tank 42 are too high, the valve II 12 on the overflow pipe 11 can be opened and drained.
And (3) measuring the content of dissolved oxygen: in the process of simulating the tidal reciprocating flow of the river channel, corresponding data of the flow velocity measuring device 19 and the dissolved oxygen measuring device 20 in the water tank body 17 are recorded, and the change rule of the reoxygenation process of the hypoxic water body under the conditions of different flow velocities, different water depths and different salinity upward of the tidal reciprocating flow river channel is analyzed.
The upstream flow control device controls the downward discharge flow by the inflow of the low-oxygen water preparation water tank and the up-and-down twitch adjustment of the water-proof baffle in the upstream water level control water tank, and the downward discharge water flows into the water tank body through the rectangular thin-wall weir, so that the downward discharge flow is calculated.
The hypoxia underwater discharge simulation and the rising and falling tide simulation are the key points of the hypoxia water body reoxygenation process under the condition of tidal reciprocating flow. The fluctuating tide flow of the tidal cycle of the designed hydrological condition can be obtained through field synchronous monitoring or hydrodynamic model simulation, and the calculation method of the fluctuating tide of the tidal cycle comprises the following steps:
the falling tide volume of the upstream and downstream sections in one tide cycle is as follows:
in the formula: the total water falling amount of the section is m 3; the average flow rate of the section falling tide is m 3/s; the section damping time s.
The tidal volume of the upstream and downstream sections of one tidal cycle is as follows:
in the formula: the total water volume of the cross section flood tide is m 3; the average flow rate of the cross section flood tide is m 3/s; the cross-section flood tide time s.
The net total water volume discharged by the upstream low-oxygen water body in one tide cycle is as follows:
in the formula: the net let-down total water quantity is m3 at the upstream of a tide cycle; the average upstream bleed-down flow of a tide cycle is m 3/s; is a tidal cycle s in which
。
The further technical scheme of the invention is as follows: the tidal water level flow control device firstly utilizes field synchronous monitoring or hydrodynamic force model simulation results to obtain the tidal flow and the tidal fall by combining the formula, and adjusts a downstream tidal water level control water tank water outlet valve and a tidal backflow simulation water tank water outlet valve to control the tidal flow and the tidal fall water level flow and period.
Tidal rising: and when the water outlet flow is zero, closing the water outlet gate of the tide backflow simulation water tank, controlling the water level of the water tank to reach the highest water level line of the tide, namely the rising and stopping of the high tide at the moment, namely the rising and stopping period of the high tide.
Tide falling: and opening a water outlet valve at the lower end of the downstream tide water level control water tank to enable the water level of the downstream tide water level control water tank and the highest tide water level line to fall to the lowest tide water level line, and at the moment, stopping falling of the big tide and the period of falling of the tide.
The further technical scheme of the invention is as follows: the salinity condition of the lower boundary rising tide is provided by actual measurement data or simulation of a constructed hydrodynamic force and salinity model, the salinity is traced upwards during rising tide, so that a salt jump layer is formed in a tidal estuary water area and an offshore water area, the vertical stratification phenomenon of a water body is caused, and the influence of rising tide and falling tide on the hydrodynamic force and the stratification can have an important influence on the process of oxygen reoxygenation of the low-oxygen water body along the journey. The device needs to add salt quantity to maintain the salinity value of the tidal backflow simulation water tank after a fluctuating tide period, the added salt quantity is quantitatively added into the tidal backflow simulation water tank through a water outlet pipe after being uniformly mixed in a compensation water tank, and the added salt quantity calculation method comprises the following steps:
rising tide salt content:
adding salt:
in the formula: the amount of salt added is mg; the rising tide salt amount is kg; the salinity of the rising tide of the tidal estuary is mg/L; the salinity of the falling tide is mg/L.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a device of simulation morning and evening tides alternating current river course hypoxemia water reoxygenation process, includes upstream flow control device, middle basin device, low reaches morning and evening tides flow water level control device, its characterized in that: the upstream flow control device comprises a low-oxygen water preparation water tank (3), an upstream water level control water tank (9) and a rectangular thin-wall weir (15), the water preparation water tank (3) is connected with the upstream water level control water tank (9) through a connecting pipe, a water-stop baffle (10) is arranged in the upstream water level control water tank (9), the intermediate water tank device comprises a water tank body (17), a flow velocity measuring device (19) is arranged in the water tank body (17), a wave-breaking grid (18) is arranged on the left side of the flow velocity measuring device (19), the downstream tide flow water level control device comprises a downstream tide water level control water tank (21), a backflow water tank (42), a variable-frequency water pump (40), a compensation water tank (37) and a tide backflow simulation water tank (30), and the downstream tide water level control water tank (21) is connected with the tide backflow simulation water tank (30) through a connecting pipe, the tide backflow simulation water tank (30) is connected with the compensation water tank (37) through a connecting pipe, the backflow water tank (42) is connected with the compensation water tank (37) through a variable frequency water pump (40), the backflow water tank (42) is connected with the downstream tide water level control water tank (21) through a connecting pipe, the upper end of the water tank body (17) is connected with the upstream water level control water tank (9) through a rectangular thin-wall weir (15), a water flow baffle plate (16) is arranged on the rectangular thin-wall weir (15) at the joint, the lower end of the water tank body (17) is connected with the downstream tide water level control water tank (21), and a dissolved oxygen measuring device II (20) is arranged in the water tank body (17).
2. The device for simulating the reoxygenation process of the low-oxygen water body in the tidal reciprocating flow riverway according to claim 1, is characterized in that: the low-oxygen water preparation water tank (3), the upstream water level control water tank (9), the downstream tide water level control water tank (21), the return water tank (42), the compensation water tank (37) and the tide backflow simulation water tank (30) are all provided with water level scale marks, the bottoms of the upstream water level control water tank (9) and the return water tank (42) are all provided with an overflow pipe (11), and a valve is arranged on the overflow pipe (11).
3. The device for simulating the reoxygenation process of the low-oxygen water body in the tidal reciprocating flow riverway according to claim 1, is characterized in that: the lowest tide water level line (24) and the highest tide water level line (25) are arranged on the downstream tide water level control water tank (21), and the wave-dissipating inclined plate (22) is arranged on the inner wall of the downstream tide water level control water tank (21).
4. The device for simulating the reoxygenation process of the low-oxygen water body in the tidal reciprocating flow riverway according to claim 1, is characterized in that: the compensation water tank (37) is connected with a salinity measuring device (34) and a dissolved oxygen measuring device III (35).
5. The device for simulating the reoxygenation process of the low-oxygen water body in the tidal reciprocating flow riverway according to claim 1, is characterized in that: the oxygen water preparing water tank (3) and the upstream water level control water tank (9) are respectively provided with an air barrier film (5) on the water surface, the oxygen water preparing water tank (3) is connected with a dissolved oxygen measuring device I (6), and the oxygen water preparing water tank (3) is provided with a water inlet pipe (1).
6. The device for simulating the reoxygenation process of the low-oxygen water body in the tidal reciprocating flow riverway according to claim 1, is characterized in that: the number of the dissolved oxygen measuring devices II (20) is 4, and the positions of the dissolved oxygen measuring devices II (20) are different.
7. A method for simulating the low-oxygen water body reoxygenation process of a tidal reciprocating flow river channel according to any one of claims 1 to 5 is characterized by being realized as follows:
selecting boundary condition parameters: obtaining upstream and downstream discharge flow, fluctuation tide cycle water level height, downstream boundary salinity, river channel and upstream and downstream boundary water body dissolved oxygen content as design hydrological conditions by combining field synchronous monitoring data or hydrodynamic model simulation results with the formula, and converting parameters according to a design scale;
preparation before simulation: adding sufficient distilled water into a low-oxygen water preparation water tank (3) through a water inlet pipe (1), preparing the low-oxygen water according to the method, detecting that the content of dissolved oxygen meets a specified value through a dissolved oxygen measuring device I (6), adding quantitative distilled water into a compensation water tank (37), adding salt according to a formula to prepare salt water, and monitoring that the salinity meets the specified value through a salinity measuring device (34);
simulating the unidirectional flow of the river channel: opening a gate II (7) on a water outlet pipe of a low-oxygen water preparation water tank (3), simultaneously pulling a water-stop baffle (16) open, enabling low-oxygen water to enter a downstream tidal water level control water tank (21) after passing through an upstream water level control water tank (9) and a water tank body (17) in sequence, pulling down the water-stop baffle (16) when the water level of the water tank reaches a normal water level, pulling the water-stop baffle (16) open after the water level of the upstream water level control water tank (9) reaches a specified value, simultaneously opening a valve I (28) on the water outlet pipe of the downstream tidal water level control water tank (21), determining the reoxygenation change condition of the low-oxygen water body in the river course, and providing reference for the research on process of the reoxygenation process of the tidal reciprocating flow low-oxygen water body;
tidal current simulation: closing the valve I (28), simultaneously opening a water outlet gate I (27) of the tide backflow simulation water tank (30), reducing the water outlet flow rate due to the reduction of the water level of the tide backflow simulation water tank (30), when the water outlet flow rate is zero, enabling the water level of the downstream tide water level control water tank (21) to reach the highest tide water level line (25), closing the gate I (27), at the moment, stopping the tide due to the rising and rising of the tide, opening the valve I (28) on the water outlet pipe of the downstream tide water level control water tank (21) after the rising and stopping of the tide, enabling the falling tide to flow into the backflow water tank (42), when the water level of the downstream tide water level control water tank (21) is reduced from the highest tide water level line to the lowest tide water level line (24), closing the valve I (28), at the moment, stopping the tide due to the falling and rising and stopping of the tide, and adjusting the variable frequency water pump (40) according to the rising and falling amount of the next cycle, enabling the backflow water tank (42) to flow into the compensation water tank (37), then closing the variable frequency water pump (40), calibrating salinity and dissolved oxygen concentration in the water body by the method, opening a valve III (32) after the salinity and dissolved oxygen concentration are determined to be in accordance with specified values by a salinity determination device (34) and a dissolved oxygen determination device III (35), enabling the compensated brine to flow into the tide backflow simulation water tank (30), circularly adjusting a downstream tide water level flow control device in such a way, simulating a tide reciprocating flow process, and opening a valve II (12) on the overflow pipe (11) to discharge when the water levels of the upstream water level control water tank (9) and the backflow water tank (42) are too high;
and (3) measuring the content of dissolved oxygen: in the process of simulating the tidal reciprocating flow of the river channel, corresponding data of a flow velocity measuring device (19) and a dissolved oxygen measuring device (20) in a water tank body (17) are recorded, and the change rule of the reoxygenation process of the hypoxic water body under the conditions of different flow velocities, different water depths and different salinity upward backtracking of the tidal reciprocating flow river channel is analyzed.
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