Simulation device and method for effect of water level and water quality variation during plum rain period on submerged plant

Abstract

The application discloses a simulation device and method for the influence of water level and water quality variation in plum rain period on submerged plants, and the simulation device comprises an outer dark box body and two inner box bodies, a planting box body is arranged in the inner box body, river and lake bottom mud is laid in the planting box body, a water temperature regulator, a stirrer, a water pump and an underwater camera shared by the two inner box bodies are arranged in the outer dark box body; a light-tight cover is arranged on the top opening of the outer dark box body, a light regulation generator is arranged on the top surface of the light-tight cover, and a dimming plate is arranged below each light splitter on the light-tight cover; the light regulation generator is used for regulating and emitting simulated incident light intensity to the corresponding inner box body through the corresponding light splitter, and the dimming plate is used for adjusting the corresponding simulated incident light intensity emitted according to the underwater light intensity attenuation characteristics of the test water body, and the equivalent incident light intensity of the underwater light intensity after the water level of the corresponding inner box body is simulated to be lifted. The application can accurately simulate the influence of water level and water quality variation in plum rain period on the growth of submerged plants.

Description

Technical Field

[0001] This invention belongs to the field of aquatic ecology technology, specifically relating to a device and method for simulating the impact of water level and water quality changes during the plum rain season on submerged plants. Background Technology

[0002] The plum rain season, occurring in June and July in the middle and lower reaches of the Yangtze River, is characterized by high humidity, heavy rainfall, and short daily hours of sunshine due to moisture. This climate negatively impacts plant growth, particularly the photosynthesis of submerged plants like aquatic plants in metastable aquatic bodies. Symptoms include yellowing roots, fewer white roots, poor plant vigor, brittle stems, and even sinking, root rot, and decay. Furthermore, the increasing frequency of extreme weather events due to global climate change exacerbates the risks associated with this period. Simulating the impact of water level and quality fluctuations on submerged plants during the plum rain season, considering factors such as water level, water quality, bottom sediment, air temperature, water temperature, and humidity, presents a significant technological challenge.

[0003] Given that most common plant cultivation boxes and all-weather growth boxes are used for plant germination and the growth medium is agar and culture medium, which are not natural sediment or natural water bodies, they cannot accurately simulate and monitor the visible characteristics and physicochemical indicators of plant survival, growth, spread, wilting and death under environmental changes such as excessive rainfall, extremely high temperature, extremely high air humidity and reduced light. Furthermore, when simulating the effects of temperature changes and water level fluctuations on plants, existing devices often ignore the interaction between water quality, water level, sediment, air temperature, air humidity and water temperature, which may lead to a large deviation between the simulation results and the actual situation. Summary of the Invention

[0004] In view of the above-mentioned deficiencies of the prior art, the present invention provides a device and method for simulating the impact of water level and water quality changes during the plum rain season on submerged plants, which can accurately simulate the impact of water level and water quality changes during the plum rain season on the growth of submerged plants.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A device for simulating the impact of water level and quality fluctuations during the plum rain season on submerged plants includes an outer dark box. Inside the outer dark box are two inner boxes, each with an open top. Planting boxes are placed inside the inner boxes, and these planting boxes are lined with river or lake bottom sediment for planting submerged plants. The outer dark box contains a water temperature regulator, a stirrer, a water pump, and an underwater camera, all shared by the two inner boxes. A light-sealing cover is installed at the top opening of the outer dark box, and a beam splitter is located on the inner top surface of the light-sealing cover. The light control generator has a dimming plate installed above each inner chamber on the light-sealed cover. The light control generator is used to control and emit simulated incident light intensity to the corresponding inner chamber through the beam splitter based on the incident light intensity and incident duration of the historical plum rain season during the test site, which are statistically analyzed and calculated. The dimming plate is used to adjust the emitted simulated incident light intensity according to the underwater light intensity attenuation characteristics of the test water body, and simulate the equivalent incident light intensity of the underwater light intensity after the water level rises in the corresponding inner chamber.

[0007] Furthermore, the outer dark box is a heat-insulating outer dark box, and the inner box is a heat-insulating inner dark box. The two inner boxes have the same structure and size and are symmetrically arranged on the left and right sides of the outer dark box. The top height of the inner box is lower than the top height of the outer dark box, and there is a gap between the two inner boxes, which is called the middle gap.

[0008] Furthermore, the light-sealing cover includes an outer heat-insulating cover and an inner heat-insulating cover with identical structures. The outer heat-insulating cover is arched, and the inner heat-insulating cover is fixed to the lower side of the outer heat-insulating cover. The gap between the outer heat-insulating cover and the inner heat-insulating cover forms a cover cavity. The light-regulating generator is fixed to the center of the inner top surface of the inner heat-insulating cover. The dimming plate on the left is horizontal and located directly above the left inner box, and the dimming plate on the right is horizontal and located directly above the right inner box.

[0009] Furthermore, a main upright is fixed at the central gap, and an outer secondary upright is fixed on the main upright at the central gap. A temperature regulator and a humidity regulator are fixed on the outer secondary upright. A main rotating crossbar that can rotate around the main upright and is located above the inner box is also provided on the upper part of the main upright. An inner secondary rotating bar that is perpendicular to the main rotating crossbar and can rotate around the main rotating crossbar and is located in the left or right inner box is provided on the main rotating crossbar. The water temperature regulator, agitator, water pump and underwater camera are respectively fixed on the inner secondary rotating bar.

[0010] Furthermore, a main rotating sleeve is fixed to one end of the main rotating crossbar. The main rotating sleeve is sleeved on the main upright and rotatably connected to the main upright via a main bearing. A semi-cylindrical main anti-rotation device is wrapped around the outside of the main rotating sleeve. Multiple main anti-rotation blocks are provided on the inner side of the main anti-rotation device, and each main anti-rotation block is pressed against the main upright. A secondary rotating sleeve is fixed to one end of the inner secondary rotating rod. The secondary rotating sleeve is sleeved on the main rotating crossbar and rotatably connected to the main rotating crossbar via a secondary bearing. A semi-cylindrical secondary anti-rotation device is wrapped around the outside of the secondary rotating sleeve. Multiple secondary anti-rotation blocks are provided on the inner side of the secondary anti-rotation device, and each secondary anti-rotation block is pressed against the main rotating crossbar.

[0011] Furthermore, the outer secondary upright is fixed to the main upright by an outer crossbar, and an inner crossbar is fixed to the inner secondary rotating rod at the end away from the main rotating crossbar. The water temperature regulator, stirrer, water pump and underwater camera are respectively fixed to the inner crossbar, and a water quality detector is also fixed to the inner crossbar.

[0012] Furthermore, the illumination control generator includes a light source and an illumination controller. The light source includes multiple LEDs with different luminous intensities. The illumination controller is used to adjust the brightness and color temperature of each LED so that the simulated incident light intensity emitted by the light source through the beam splitter matches the incident light intensity during the day and night of the historical plum rain season at the test site. An underwater illumination sensor is also fixed on the inner secondary rotating rod to monitor the actual underwater light intensity inside the inner box on the left or right side. The dimming plate is used to adjust the corresponding simulated incident light intensity emitted according to the underwater light intensity attenuation characteristics of the test water body and in combination with the monitored actual underwater light intensity, so as to simulate the equivalent incident light intensity of the underwater light intensity after the water level of the corresponding inner box is raised.

[0013] Furthermore, both the planting box and the inner box are rectangular parallelepipeds, and the size of the planting box is adapted to the size of the bottom of the corresponding inner box. The top of the planting box is provided with multiple lifting holes.

[0014] A method for simulating the impact of water level and water quality changes during the plum rain season on submerged plants, using the aforementioned simulation device for the impact of water level and water quality changes during the plum rain season on submerged plants, includes the following steps:

[0015] S1. Place the planting box in the corresponding inner box, lay river and lake bottom mud in each planting box, and plant submerged plants on the river and lake bottom mud.

[0016] S2. The light control generator, based on statistical analysis and calculation of the historical daytime and nighttime light intensity and duration of the rainy season in the test site, controls and emits simulated incident light intensity to the corresponding inner chamber through the beam splitter. The dimming plate on the left adjusts the emitted simulated incident light intensity according to the underwater light intensity attenuation characteristics of the test water body, and simulates the equivalent incident light intensity of the underwater light intensity after the water level rises in the inner chamber on the left. The light sealing cover does not have a dimming plate corresponding to the inner chamber on the right. The simulated incident light intensity emitted to the inner chamber on the right is directly output to the inner chamber on the right without adjustment by the dimming plate, as a control test.

[0017] S3. The test water is added to the left and right inner tanks in sequence by the water pump and the water level is raised to the predetermined height. Nutrients or humic acid are added to the left inner tank and the test water in the left inner tank is stirred evenly by the stirrer to simulate the water quality fluctuation caused by the discharge of pollutants from the area where rainwater runoff collects into rivers and lakes during the plum rain season in the test area.

[0018] S4. The water temperature in the left and right inner chambers is adjusted sequentially by the water temperature regulator to simulate the water temperature conditions during the plum rain season at the test site.

[0019] S5. Close the light-sealed cover and monitor the growth of submerged plants in the two inner boxes on the left and right sides using the underwater camera to determine the impact of water level and water quality changes during the plum rain season on the growth of submerged plants.

[0020] Furthermore,

[0021] In step S1: the river and lake bottom mud laid in the left and right planting boxes is of the same quality and thickness, and the submerged plants planted on the river and lake bottom mud in the left and right planting boxes are the same.

[0022] In step S2: the duration of simulated incident light intensity is matched with the duration of incident light intensity during the day and night of the historical plum rain season in the test site, and the adjustment duration of the dimming plate on the left is equal to the duration of the water level rise.

[0023] In step S3: the water level of the test water in the two inner tanks on the left and right sides is the same;

[0024] In step S4: the water temperature of the test water in the two inner chambers on the left and right sides is the same.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] In this invention, when simulating the impact of water level and quality fluctuations during the plum rain season on the growth of submerged plants, planting boxes are placed inside corresponding inner boxes. River and lake sediment is laid in each planting box, and submerged plants are planted on the sediment. A light control generator, based on statistical analysis and calculation of the historical daytime and nighttime light intensity and duration during the plum rain season at the experimental site, controls and emits simulated incident light intensity to the corresponding inner box via a beam splitter. A left-side dimming plate adjusts the emitted simulated incident light intensity according to the underwater light intensity attenuation characteristics of the experimental water body, simulating the equivalent incident light intensity of underwater light intensity after the water level rises in the left inner box. No dimming plate corresponding to the right inner box is installed on the light-sealed cover, and the simulated incident light emitted to the right inner box... The incident light intensity was directly output to the right inner chamber without adjustment by a dimming panel, serving as a control experiment. Test water was added to both inner chambers sequentially using a water pump, raising the water level to a predetermined height. Nutrients or humic acid were added to the left inner chamber, and the water was stirred evenly using a stirrer to simulate water quality fluctuations caused by pollutants from rainwater runoff flowing into rivers and lakes during the rainy season. The water temperature in both inner chambers was adjusted sequentially using a temperature regulator to simulate the water temperature conditions during the rainy season. The light-sealing cover was closed, and an underwater camera monitored the growth of submerged plants in both inner chambers to assess the impact of water level and quality changes during the rainy season on plant growth. By configuring the light generator, beam splitter, and dimming plate, this invention can simulate the equivalent incident light intensity of underwater light after the water level rises. Using this equivalent incident light intensity to replace the actual water level rise, the simulation device for the impact of water level and quality fluctuations during the plum rain season on submerged plants can accurately simulate the effects of these fluctuations on plant growth, as well as the duration of the water level rise. It can comprehensively consider the influence of water level, water quality, and water temperature on submerged plant growth. This invention provides more accurate simulation results for environmental simulation technology, helping to improve the accuracy and reliability of environmental simulations. It also provides a deeper theoretical basis for submerged plant ecology research, helping researchers to better understand the growth and development patterns of submerged plants under fluctuating water levels and quality. Furthermore, it provides a scientific basis for aquatic ecological environment protection, contributing to the protection and restoration of the aquatic ecological environment.

[0027] In this invention, the top height of the inner box is lower than the top height of the outer box. There is a gap between the two inner boxes, called the middle gap. A main upright is fixed at the middle gap. An outer secondary upright is fixed on the main upright at the middle gap. A temperature regulator and a humidity regulator are fixed on the outer secondary upright. A main rotating crossbar that can rotate around the main upright and is located above the inner box is also provided on the main upright. An inner secondary rotating bar that is perpendicular to the main rotating crossbar and can rotate around the main rotating crossbar and is located in the left or right inner box is provided on the main rotating crossbar. A water temperature regulator, a stirrer, a water pump and an underwater camera are respectively fixed on the inner secondary rotating bar. This central gap facilitates the installation of temperature and humidity regulators, allowing for simultaneous adjustment of the temperature and humidity within both inner chambers using a single temperature regulator. Since the top of the inner chamber is lower than the top of the outer chamber, a main rotating crossbar can be positioned above the inner chamber and below the outer chamber on the main upright. When moving the inner secondary rotating rod from the right inner chamber to the left, it is first rotated around the main rotating crossbar to rotate the inner secondary rotating rod, along with the temperature regulator, agitator, water pump, and underwater camera, to the top of the right inner chamber. Then, the main rotating crossbar is rotated around the main upright to rotate the inner secondary rotating rod, along with the temperature regulator, agitator, water pump, and underwater camera, to the left inner chamber. Above the innermost chamber, an inner secondary rotating rod rotates around the main rotating crossbar at a certain angle to rotate the inner secondary rotating rod, along with the water temperature regulator, agitator, water pump, and underwater camera, into the left innermost chamber. Therefore, the main rotating crossbar and the inner secondary rotating rod facilitate the sharing of the water temperature regulator, agitator, water pump, and underwater camera between the left and right inner chambers. Furthermore, when the water temperature regulator, agitator, water pump, and underwater camera complete their respective tasks, the inner secondary rotating rod, along with these components, is positioned within one of the inner chambers. The main rotating crossbar rotates around the main upright at a certain angle to rotate the inner secondary rotating rod to one side of the corresponding inner chamber, preventing the water temperature regulator, agitator, water pump, and underwater camera on the inner secondary rotating rod from blocking the equivalent or simulated incident light intensity output to the corresponding inner chamber. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the device and method for simulating the impact of water level and water quality changes during the plum rain season on submerged plants in this invention.

[0029] Figure 2 A schematic diagram of the structure of the light-sealed cover;

[0030] Figure 3 This is a structural diagram of the planting box;

[0031] Figure 4 A schematic diagram showing the installation of a water temperature regulator, agitator, water pump, air temperature regulator, and humidity regulator.

[0032] The diagram shows the following labels: 101, outer dark box; 102, inner box; 201, planting box; 20101, hoisting hole; 202, river / lake bottom mud; 203, submerged plant; 301, water temperature regulator; 302, stirrer; 303, water pump; 304, air temperature regulator; 305, humidity regulator; 4, light-sealing cover; 401, heat-insulating outer dark cover; 402, heat-insulating inner cover; 403, cover cavity; 501, light control generator; 502, light splitter; 6, light-dimming plate; 701, main upright; 702, outer secondary upright; 703, main rotating crossbar; 704, inner secondary rotating bar; 705, main rotating sleeve; 706, main anti-rotation device; 707, secondary rotating sleeve; 708, outer crossbar; 709, inner crossbar. Detailed Implementation

[0033] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0034] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0037] like Figures 1-4As shown, a simulation device for the impact of water level and quality fluctuations during the plum rain season on submerged plants includes an outer dark box 101, inside which are placed two inner boxes 102 with openings at the top on the left and right sides. Inside the inner boxes 102 are planting boxes 201, which are lined with river and lake bottom mud 202 for planting submerged plants 203. The outer dark box 101 contains a water temperature regulator 301, a stirrer 302, a water pump 303, and an underwater camera, all shared by the two inner boxes 102. A light-sealing cover 4 is placed over the top opening of the outer dark box 101, and the inner top surface of the light-sealing cover 4... The upper part is equipped with a light control generator 501 connected to the beam splitter 502. The light sealing cover 4 is equipped with a dimming plate 6 above each inner box 102. The light control generator 501 is used to control and emit simulated incident light intensity to the corresponding inner box 102 through the beam splitter 502 based on the incident light intensity and incident duration of the historical plum rain season in the test site, which are statistically analyzed and calculated. The dimming plate 6 is used to adjust the emitted simulated incident light intensity according to the underwater light intensity attenuation characteristics of the test water body, and simulate the equivalent incident light intensity of the underwater light intensity after the water level rises in the corresponding inner box 102.

[0038] By configuring the light control generator 501, the beam splitter 502, and the dimming plate 6, the equivalent incident light intensity of underwater light intensity after the output water level rises can be simulated. Using the equivalent incident light intensity to replace the actual water level rise, this invention's simulation device for the impact of water level and quality changes during the plum rain season on submerged plants can accurately simulate the effects of these changes on the growth of submerged plant 203, and accurately simulate the impact of the duration of water level rise on the growth of submerged plant 203. It can also comprehensively consider the effects of water level, water quality, and water temperature on the growth of submerged plant 203. This invention provides more accurate simulation results for environmental simulation technology, helps improve the accuracy and reliability of environmental simulation, provides a deeper theoretical basis for the ecological research of submerged plant 203, helps researchers better understand the growth and development patterns of submerged plant 203 under fluctuating water level and quality conditions, provides a scientific basis for aquatic ecological environment protection, and contributes to the protection and restoration of the aquatic ecological environment. The simulation device of this invention can not only be used to study the effect of underwater light intensity on the growth of submerged plant 203, but can also be widely applied to other experiments that require simulation of underwater light intensity, and has broad application prospects.

[0039] Among them, such as Figure 1As shown, the outer enclosure 101 is a heat-insulating outer enclosure, and the inner enclosure 102 is a heat-insulating inner enclosure. The two inner enclosures 102 have the same structure and dimensions and are symmetrically arranged on the left and right sides inside the outer enclosure 101. The top height of the inner enclosure 102 is lower than the top height of the outer enclosure 101. A gap is left between the two inner enclosures 102, which is called the central gap. Both the inner enclosure 102 and the outer enclosure 101 are rectangular. The outer enclosure 101 is 140cm high, 40cm wide, and 150cm long. The inner enclosure 102 is 120cm high, 40cm wide, and 60cm long. The width of the central gap is 30cm. The planting box 201 has multiple hoisting holes 20101 at its top. The planting box 201 is 20cm high, 40cm wide, and 60cm long. The thickness of the river and lake bottom mud 202 laid inside the planting box 201 is controlled at 10-18cm to prevent the thickness of the river and lake bottom mud 202 from exceeding the height of the planting box 201, so as to facilitate the cleaning of the planting box 201.

[0040] In this way, the inner heat-insulating box can provide heat insulation for the submerged plants 203 planted on the river and lake bottom mud 202 in the corresponding planting box 201. The outer heat-insulating box can further provide heat insulation for the submerged plants 203. The combination of the inner heat-insulating box and the outer heat-insulating box can improve the heat insulation effect on the submerged plants 203. Moreover, the outer heat-insulating box is opaque, which can prevent the influence of external light on the underwater light intensity.

[0041] Among them, such as Figure 1 and Figure 2 As shown, the light-sealed cover 4 includes an outer heat-insulating cover 401 and an inner heat-insulating cover 402 with the same structure. The outer heat-insulating cover 401 is arched, and the inner heat-insulating cover 402 is fixed to the lower side of the outer heat-insulating cover 401. The gap between the outer heat-insulating cover 401 and the inner heat-insulating cover 402 forms a cover cavity 403. The light-controlling generator 501 is fixed to the middle of the inner top surface of the inner heat-insulating cover 402. The left dimming plate 6 is horizontal and located directly above the left inner box 102, and the right dimming plate 6 is horizontal and located directly above the right inner box 102.

[0042] The inner heat-insulating cover 402 provides insulation for the submerged plants 203 planted on the riverbed mud 202 in the two planting boxes 201. The outer heat-insulating cover 401 further insulates the submerged plants 203. The cavity 403 reduces the heat transfer from the inner heat-insulating cover 402 to the outer heat-insulating cover 401. The inner heat-insulating cover 402, the outer heat-insulating cover 401, and the cavity 403 work together to improve the heat insulation of the light-sealing cover 4. The light-sealing cover 4 is also opaque, preventing external light from affecting the underwater light intensity.

[0043] Among them, such as Figure 1 and Figure 4 As shown, a main upright 701 is fixed at the middle gap, and an outer secondary upright 702 located at the middle gap is fixed on the main upright 701. A temperature regulator 304 and a humidity regulator 305 are fixed on the outer secondary upright 702. A main rotating crossbar 703 that can rotate around the main upright 701 and is located above the inner box 102 is also provided on the upper part of the main upright 701. An inner secondary rotating bar 704 that is perpendicular to the main rotating crossbar 703, can rotate around the main rotating crossbar 703, and is located in the left or right inner box 102 is provided on the main rotating crossbar 703. The water temperature regulator 301, the stirrer 302, the water pump 303, and the underwater camera are respectively fixed on the inner secondary rotating bar 704. The water pump 303 is a small flow submersible pump 303.

[0044] This central gap facilitates the installation of a temperature regulator 304 and a humidity regulator 305, allowing simultaneous adjustment of the temperature inside both inner chambers 102 via a single temperature regulator 304 and humidity via a single humidity regulator 305. Since the top of the inner chamber 102 is lower than the top of the outer dark chamber 101, a main rotating crossbar 703 can be installed on the upper part of the main upright 701, positioned above the inner chamber 102 and below the outer dark chamber 101. This allows for easy adjustment of the right-side rotation when necessary. When the inner secondary rotating rod 704 inside the inner chamber 102 is moved to the left inner chamber 102, it first rotates around the main rotating crossbar 703 by a certain angle to rotate the inner secondary rotating rod 704, along with the water temperature regulator 301, stirrer 302, water pump 303, and underwater camera, to the top of the right inner chamber 102. Then, it rotates around the main upright rod 701 by the main rotating crossbar 703 by a certain angle to rotate the inner secondary rotating rod 704, along with the water temperature regulator 301, stirrer 302, water pump 303, and underwater camera, to the left inner chamber 102. Above body 102, the inner secondary rotating rod 704 rotates around the main rotating crossbar 703 by a certain angle, so that the inner secondary rotating rod 704, together with the water temperature regulator 301, stirrer 302, water pump 303 and underwater camera, are rotated into the left inner tank 102. Therefore, the setting of the main rotating crossbar 703 and the inner secondary rotating rod 704 makes it convenient for the left and right inner tanks 102 to share the water temperature regulator 301, stirrer 302, water pump 303 and underwater camera; in addition, when the water temperature regulator 301, stirrer 302, water pump 303 and underwater camera are fully operational... When the corresponding operation is completed, the inner secondary rotating rod 704, together with the water temperature regulator 301, the stirrer 302, the water pump 303 and the underwater camera, is located in one of the inner chambers 102. The main rotating crossbar 703 rotates around the main upright 701 by a certain angle, so as to drive the inner secondary rotating rod 704 to rotate to one side of the corresponding inner chamber 102, so as to prevent the water temperature regulator 301, the stirrer 302, the water pump 303 and the underwater camera on the inner secondary rotating rod 704 from blocking the equivalent incident light intensity or simulated incident light intensity output to the corresponding inner chamber 102.

[0045] Among them, such as Figure 1 and Figure 4As shown, a main rotating crossbar 703 has a main rotating sleeve 705 fixed at one end. The main rotating sleeve 705 is sleeved on the main upright 701 and rotatably connected to the main upright 701 through a main bearing. The outer side of the main rotating sleeve 705 is covered with a semi-cylindrical main anti-rotation device 706. The inner side of the main anti-rotation device 706 is provided with multiple main anti-rotation blocks, and each main anti-rotation block is pressed onto the main upright 701. A secondary rotating bar 704 has a secondary rotating sleeve 707 fixed at one end. The secondary rotating sleeve 707 is sleeved on the main rotating crossbar 703 and rotatably connected to the main rotating crossbar 703 through a secondary bearing. The outer side of the secondary rotating sleeve 707 is covered with a semi-cylindrical secondary anti-rotation device. The inner side of the secondary anti-rotation device is provided with multiple secondary anti-rotation blocks, and each secondary anti-rotation block is pressed onto the main rotating crossbar 703.

[0046] When the inner secondary rotating rod 704 rotates around the main rotating crossbar 703 by a certain angle, the secondary anti-rotation device is wrapped around the outer side of the secondary rotating sleeve 707, and the action of multiple secondary anti-rotation blocks prevents the inner secondary rotating rod 704 from continuing to rotate around the main rotating crossbar 703. When the main rotating crossbar 703 rotates around the main upright 701 by a certain angle, the main anti-rotation device 706 is wrapped around the outer side of the main rotating sleeve 705, and the action of multiple main anti-rotation blocks prevents the main rotating crossbar 703 from continuing to rotate around the main upright 701.

[0047] Among them, such as Figure 1 and Figure 4 As shown, the outer secondary upright 702 is fixed to the main upright 701 via the outer crossbar 708. An inner crossbar 709 is fixed to the inner secondary rotating rod 704 at the end furthest from the main rotating crossbar 703. The water temperature regulator 301, stirrer 302, water pump 303, and underwater camera are respectively fixed to the inner crossbar 709. A water quality detector is also fixed to the inner crossbar 709. This water quality detector can sequentially detect water quality indicators within the left and right inner tanks 102.

[0048] The light control generator 501 includes a light source and a light controller. The light source includes multiple LEDs with different luminous intensities. The light controller is used to adjust the brightness and color temperature of each LED so that the simulated incident light intensity emitted by the light source through the beam splitter 502 matches the incident light intensity during the day and night of the historical plum rain season in the test site. An underwater light sensor is also fixed on the inner secondary rotating rod 704 to monitor the actual underwater light intensity in the left or right inner box 102. The dimming plate 6 is used to adjust the corresponding simulated incident light intensity emitted according to the underwater light intensity attenuation characteristics of the test water body and in combination with the monitored actual underwater light intensity, so as to simulate the equivalent incident light intensity of the underwater light intensity after the water level of the corresponding inner box 102 is raised.

[0049] By configuring the light control generator 501, the dimming plate 6, the beam splitter 502, and the underwater light sensor, the reduction in underwater light intensity caused by the rise in water level after sunlight enters a natural water body can be accurately simulated. This allows for a more accurate understanding of the relationship between the reduction in underwater light intensity and the growth of submerged plants 203. Furthermore, this invention can precisely control the equivalent incident light intensity. Combined with the two inner chambers 102 of this invention, the effects of different reductions in underwater light intensity caused by varying water level changes on the growth of submerged plants 203 can be studied simultaneously. This allows for a deeper understanding of the mechanism by which the reduction in underwater light intensity caused by the rise in water level during a specific period affects the growth of submerged plants 203.

[0050] A method for simulating the impact of water level and water quality changes during the plum rain season on submerged plants, using the aforementioned simulation device for the impact of water level and water quality changes during the plum rain season on submerged plants, includes the following steps:

[0051] S1. Place the planting box 201 in the corresponding inner box 102, and lay river and lake bottom mud 202 in each planting box 201. The river and lake bottom mud 202 laid in the left and right planting boxes 201 are of the same quality and thickness. Plant submerged plants 203 on the river and lake bottom mud 202. The submerged plants 203 planted on the river and lake bottom mud 202 in the left and right planting boxes 201 are the same.

[0052] S2. The light control generator 501, based on statistical analysis and calculation of the incident light intensity and duration during the day and night of the historical plum rain season in the test site, controls and emits simulated incident light intensity to the corresponding inner box 102 through the beam splitter 502. The incident duration of the simulated incident light intensity matches the incident duration of the incident light intensity during the day and night of the historical plum rain season in the test site. The left dimming plate 6 adjusts the emitted simulated incident light intensity according to the underwater light intensity attenuation characteristics of the test water body, and simulates the equivalent incident light intensity of the underwater light intensity after the water level rises in the left inner box 102. The adjustment time of the left dimming plate 6 is equal to the duration of the water level rise. The light sealing cover 4 does not have a dimming plate 6 corresponding to the right inner box 102. The simulated incident light intensity emitted to the right inner box 102 is directly output to the right inner box 102 without being adjusted by the dimming plate 6, as a control test.

[0053] S3. The test water is added to the left and right inner tanks 102 in sequence by the water pump 303 and the water level is raised to the predetermined height. The water level of the test water in the left and right inner tanks 102 is the same. Nutrients or humic acid are added to the left inner tank 102 and the test water in the left inner tank 102 is stirred evenly by the stirrer 302 to simulate the water quality fluctuation caused by the discharge of pollutants from the area where rainwater runoff collects into rivers and lakes during the plum rain season in the test area.

[0054] S4. The water temperature in the left and right inner chambers 102 is adjusted sequentially by the water temperature regulator 301, wherein the water temperature of the test water in the left and right inner chambers 102 is the same. The air temperature in the left and right inner chambers 102 is adjusted simultaneously by the air temperature regulator 304. The air humidity in the left and right inner chambers 102 is adjusted simultaneously by the humidity regulator 305, wherein the air temperature and air humidity in the left and right inner chambers 102 are the same, so as to simulate the water temperature, air temperature and air humidity conditions of the test site during the plum rain season.

[0055] S5. Close the light-sealing cover 4 and monitor the growth of the submerged plants 203 in the two inner boxes 102 on the left and right sides through the underwater camera to determine the impact of water level and water quality changes during the plum rain season on the growth of the submerged plants 203. The underwater camera is used to monitor the leaf area of ​​the submerged plants 203.

[0056] In one embodiment, a method for accurately simulating water level fluctuations by adjusting the simulated incident light intensity in the experimental scheme is as follows: Based on the annual Taihu Lake hydrological report from 2006 to 2021, statistical analysis was conducted on rainfall during the Meiyu season and the resulting water level fluctuations. The results showed that the average water level rise in Taihu Lake during the Meiyu season was 0.52 m, with the measured average underwater light intensity attenuation coefficient in the area with moderate aquatic plant growth in East Taihu Lake during the Meiyu season being 2.48 m. -1 According to the shading simulation calculation formula K = -z -1 ×ln(Ez / E0), where K represents the underwater light intensity attenuation coefficient, z represents the water level fluctuation range, Ez represents the underwater light intensity at water depth z, and E0 represents the water surface light intensity. Based on the above statistical results, adjusting the coverage of the dimming plate to 27% can effectively simulate the change in underwater light intensity caused by water level changes during the summer flood season.

[0057] In one embodiment, the method for dynamically simulating the actual distribution of incident light intensity during the day and night in the test site during the plum rain season is as follows: The plum rain season in Shanghai in 2023 began on June 17th and ended on July 11th. During this period, sunrise was 4:58-4:50, midday was 11:54-11:59, and sunset was 19:00-19:01. The diurnal variation values ​​and ranges of light intensity are: approximately 300 lux at sunrise and sunset, 0.003-0.3 lux at night, 50-500 lux on cloudy days, and 3000-300000 lux on sunny days. Based on the solar incidence and test location, an organic combination of LED lights with luminous intensities of 1 x 500 μCd, 1 x 100 mCd, 1 x 500 mCd, and 1 x 1000 mCd can meet the test conditions, simulating the smooth variation of light intensity from 50 lux to 3000 lux during the day from 4:50 AM to 11:59 AM, from 3000 lux to 50 lux during the day from 11:59 PM to 7:00 PM, and from 7:00 PM to 4:58 AM between 0.003 and 300 lux.

[0058] In one embodiment, the actual method for dynamically simulating river and lake bottom sediment 202, plant planting, and water temperature is as follows: A 15cm thick layer of river and lake bottom sediment 202 is laid inside the planting box 201, and surrounding river water is added to ensure that the water level is 3-5cm higher than the top surface of the river and lake bottom sediment 202. Then, propagules of five kinds of submerged plants 203, namely, goldfish algae, Vallisneria natans, whorled hydrangea, Elodea nuttallii, and Potamogeton crispus, are scattered on the surface of the river and lake bottom sediment 202. 50 propagules of each submerged plant 203 are planted at a spacing of 10×10cm. According to the water temperature monitoring data of the Taihu Lake Basin hydrological station, the average water temperature during the plum rain season from mid-June to mid-July is 28.97℃, and the simulated water temperature is 29℃.

[0059] In one embodiment, a combined simulation of multiple operating conditions was conducted: the impact of continuous shading for 1 or 3 days was considered mild, the impact of continuous shading for 7 days was considered moderate, and the impact of continuous shading for 15 or 21 days was considered severe. The growth, survival, and leaf area of ​​the submerged plant 203 were monitored. The experimental results showed that under a shading condition of 27%, the decrease in underwater light intensity caused by rising water levels had a relatively small impact on *Ceratophyllum demersum* and *Vallisneria natans*. Compared with normal light treatment, the survival rates of *Ceratophyllum demersum* and *Vallisneria natans* did not decrease significantly after 21 days of continuous shading. The survival rates of *Elodea nuttallii* and *Hydrilla verticillata* decreased slightly compared with normal light, but the trend was not significant. The survival rate of *Potamogeton crispus* began to decrease significantly compared with the normal light group after 1 day and 5 days of shading treatment, respectively. All *Potamogeton crispus* died after 14 days of shading treatment.

[0060] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A device for simulating the impact of water level and water quality changes during the plum rain season on submerged plants, characterized in that: The application relates to a kind of river and lake bottom mud planting device, including outer layer dark box body (101), the inner layer box body (102) of left and right two top end openings is placed in the outer layer dark box body (101), the planting box body (201) is placed in the inner layer box body (102), river and lake bottom mud (202) for planting submerged plant (203) is laid in the planting box body (201), water temperature regulator (301) shared by two inner layer box bodies (102), agitator (302), water pump (303) and underwater camera are equipped in the outer layer dark box body (101);Light-tight cover (4) is covered at the top end opening of the outer layer dark box body (101), light-tight cover (4) is equipped with light control generator (501) connected with light splitter (502) on the top surface, light control generator (501) is used for according to the test site historical plum rain period daytime and night illumination intensity and illumination time calculated by statistical analysis, controls and emits simulated illumination intensity to corresponding inner layer box body (102) by light splitter (502), light-tight cover (4) is equipped with light adjustment plate (6) above each inner layer box body (102), light adjustment plate (6) is used for adjusting the corresponding simulated illumination intensity emitted according to the test water body underwater light attenuation characteristics, the equivalent illumination intensity of underwater light intensity simulated output after water level lifting of corresponding inner layer box body (102); The outer layer dark box body (101) is heat-insulated outer layer dark box body, the inner layer box body (102) is heat-insulated inner layer dark box body, the structure and size of left and right two inner layer box bodies (102) are the same and symmetrically arranged on the left and right sides in the outer layer dark box body (101), the top end height of the inner layer box body (102) is lower than the top end height of the outer layer dark box body (101), and a gap is left between the left and right two inner layer box bodies (102) and is called middle gap; Main vertical rod (701) is fixed in the middle gap, outer side secondary vertical rod (702) is fixed on the main vertical rod (701) and is located in the middle gap, air temperature regulator (304) and humidity regulator (305) are fixed on the outer side secondary vertical rod (702), main rotating cross bar (703) capable of rotating around main vertical rod (701) and located above inner layer box body (102) is further provided on the main vertical rod (701), inner side secondary rotating rod (704) perpendicular to main rotating cross bar (703) and capable of rotating around main rotating cross bar (703) and located in left or right inner layer box body (102) is provided on main rotating cross bar (703), water temperature regulator (301), agitator (302), water pump (303) and underwater camera are respectively fixed on inner side secondary rotating rod (704); The light illumination closed cover (4) comprises a heat insulation outer layer cover (401) and a heat insulation inner layer cover (402) which are identical in structure, the heat insulation outer layer cover (401) is arched, the heat insulation inner layer cover (402) is fixed to the lower side of the heat insulation outer layer cover (401), the gap between the heat insulation outer layer cover (401) and the heat insulation inner layer cover (402) forms a cover cavity (403), the light illumination control generator (501) is fixed to the middle part of the inner top surface of the heat insulation inner layer cover (402), the left light modulation plate (6) is horizontally arranged above the left inner layer box (102), and the right light modulation plate (6) is horizontally arranged above the right inner layer box (102).

2. The device according to claim 1, wherein the device is characterized by: The outer side secondary vertical rod (702) is fixed to the main vertical rod (701) through an outer side horizontal rod (708), the inner side secondary rotating rod (704) is fixed to the inner side horizontal rod (709) at an end away from the main rotating horizontal rod (703), the water temperature regulator (301), the stirrer (302), the water pump (303) and the underwater camera are respectively fixed to the inner side horizontal rod (709), and the water quality detector is also fixed to the inner side horizontal rod (709).

3. The device according to claim 1, wherein the device is characterized by: The light illumination control generator (501) comprises a light source and a light illumination controller, the light source comprises a plurality of LED lamps with different luminous intensities, the light illumination controller is used for adjusting the brightness and color temperature of the LED lamps, so that the simulated illumination intensity emitted by the light source through the beam splitter (502) matches the illumination intensity of the test field in the historical plum rain period of the day and night; the underwater light illumination sensor is also fixed to the inner side secondary rotating rod (704) and is used for monitoring the actual underwater light intensity in the left or right inner layer box (102), the light modulation plate (6) is used for adjusting the corresponding simulated illumination intensity emitted according to the underwater light intensity attenuation characteristics of the test water body and in combination with the monitored actual underwater light intensity, and the equivalent illumination intensity of the underwater light intensity after the simulated output water level of the corresponding inner layer box (102) is lifted.

4. The device according to claim 1, wherein the device is characterized by: ​ 5. The device according to claim 1, wherein the device is characterized by: The planting box (201) and the inner layer box (102) are both cuboids, the size of the planting box (201) is matched with the size of the inner bottom of the corresponding inner layer box (102), and the top end of the planting box (201) is provided with a plurality of lifting holes (20101).

6. A method for simulating the effect of water level and water quality variation during the rainy season on submerged plants, using the simulation device for simulating the effect of water level and water quality variation during the rainy season on submerged plants according to any one of claims 1 to 5, characterized in that, The method comprises the following steps: S1, placing the planting box (201) in the corresponding inner layer box (102), laying river and lake sediment (202) in each planting box (201), and planting submerged plants (203) on the river and lake sediment (202); S2, the light control generator (501) controls and emits simulated incident light intensity to the corresponding inner layer box (102) through the light splitter (502) according to the statistical analysis and calculated incident light intensity and incident duration of the historical Meiyu period of the test site, the left light adjusting plate (6) adjusts the emitted corresponding simulated incident light intensity according to the underwater light intensity attenuation characteristics of the test water body, and the equivalent incident light intensity of the simulated underwater light intensity after the water level is lifted in the left inner layer box (102), the light-tight cover (4) is not provided with a light adjusting plate (6) corresponding to the left inner layer box (102), and the simulated incident light intensity emitted to the right inner layer box (102) is not adjusted by the light adjusting plate (6) and is directly output to the right inner layer box (102) as a control test; S3, adding test water bodies to the left and right inner layer boxes (102) in sequence through the water pump (303), and lifting the water level to a predetermined height, adding nutrients or humic acid to the left inner layer box (102), and stirring the test water body in the left inner layer box (102) uniformly through the stirrer (302) to simulate the water quality fluctuation caused by the regional pollutants discharged to the river and lake due to rainwater runoff accumulation in the Meiyu period of the test site; S4, adjusting the water temperature in the left and right inner layer boxes (102) in sequence through the water temperature regulator (301) to simulate the water temperature conditions in the Meiyu period of the test site; S5, closing the light-tight cover (4), monitoring the growth of the submerged plants (203) in the left and right inner layer boxes (102) through the underwater camera, and determining the influence of the water level and water quality variation in the Meiyu period on the growth of the submerged plants (203).

7. The method according to claim 6, wherein in step S1, the river and lake sediment (202) laid in the left and right planting boxes (201) is of the same quality and thickness, and the submerged plants (203) planted on the river and lake sediment (202) in the left and right planting boxes (201) are the same; In step S2, the incident duration of the simulated incident light intensity matches the incident duration of the incident light intensity in the historical Meiyu period of the test site, and the adjustment duration of the left light adjusting plate (6) is equal to the duration of the water level lifting; In step S3, the water level height of the test water bodies in the left and right inner layer boxes (102) is the same; In step S4, the water temperature of the test water bodies in the left and right inner layer boxes (102) is the same. ​

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