CN114772737B - Underwater light field-water quality regulation and control device and method for aquatic plant recovery - Google Patents

Underwater light field-water quality regulation and control device and method for aquatic plant recovery Download PDF

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CN114772737B
CN114772737B CN202210393756.1A CN202210393756A CN114772737B CN 114772737 B CN114772737 B CN 114772737B CN 202210393756 A CN202210393756 A CN 202210393756A CN 114772737 B CN114772737 B CN 114772737B
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underwater
filter
light
connecting rope
aquatic
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CN114772737A (en
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胡洋
高光
许亮
仇健
姜星宇
邵克强
汤祥明
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Nanjing Institute of Geography and Limnology of CAS
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/32Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S11/00Non-electric lighting devices or systems using daylight
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S11/00Non-electric lighting devices or systems using daylight
    • F21S11/007Non-electric lighting devices or systems using daylight characterised by the means for transmitting light into the interior of a building
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00Use of specific compounds during water treatment
    • C02F2305/10Photocatalysts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V2200/00Use of light guides, e.g. fibre optic devices, in lighting devices or systems
    • F21V2200/10Use of light guides, e.g. fibre optic devices, in lighting devices or systems of light guides of the optical fibres type
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P60/00Technologies relating to agriculture, livestock or agroalimentary industries
    • Y02P60/20Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
    • Y02P60/21Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Sustainable Development (AREA)
  • Water Supply & Treatment (AREA)
  • Physics & Mathematics (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
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Abstract

The invention discloses an underwater light field-water quality regulation and control device for aquatic plant recovery, which comprises a floating platform, wherein an illumination collection device is arranged on the floating platform, the illumination collection device is connected with a light conduction device positioned on the floating platform, an ultraviolet light and visible light filter is arranged on the light conduction device, the filter is connected with a filter replacement device, a plurality of optical fibers are connected to the tail part of the light conduction device, and a graphene nano photocatalytic material is sprayed on the outer surface of the light conduction device; the optical fiber is connected with a diffuse light emitter on an underwater bracket, and the bracket is connected with the floating platform through a first spring; the support is also provided with an underwater monitoring system which is connected with a controller, and the controller is connected with the optical filter replacing device. The underwater support is provided with a storage hole in which aquatic plant growth promoting particles are placed. The regulation and control device and the regulation and control method constructed by the invention can improve the underwater light field and water quality required by the growth and propagation of aquatic plants, and provide a new technology and method for repairing the degraded lake ecosystem.

Description

Underwater light field-water quality regulation and control device and method for aquatic plant recovery
Technical Field
The invention relates to an underwater light field-water quality regulation device for aquatic plant recovery, and belongs to the field of environments.
Background
At the beginning of the 50 s of the 20 th century, most of the lakes and waterweeds in China grew luxuriantly and in various types, and the lakes belong to the typical grass-type lakes. However, after 60 s, as the basin population increases and industry develops, a large amount of domestic sewage and industrial wastewater is discharged into lakes, resulting in a dramatic decrease in the number and variety of aquatic plants in many lakes, while floating algae proliferate in large quantities, forming typical "algae" lakes. Along with the conversion of 'grass-algae' lakes, the water quality of the lakes is rapidly deteriorated, the biodiversity is reduced, the bio-geochemical circulation is blocked, and the health and safety of the ecological systems of the lakes are seriously damaged.
Aquatic plants are key to improving water environment, repairing damaged lake ecosystem and realizing sustainable development of water resources: on the one hand, the aquatic plants inhibit the growth of planktonic algae through the secretory substances, and promote the transformation of the lake from an algae-type lake to a grass-type lake. On the other hand, aquatic plants also convert CO by photosynthesis 2 Is fixed and becomes an important carbon reservoir of the lake ecosystem. For this reason, researchers at home and abroad have developed a series of techniques and methods including lowering water level to reduce light attenuation, sprinkling flocculant and increasing filter feeding shellfish to improve transparency of water, constructing membrane separation purification system even on land, etc. While these techniques have achieved tremendous success in aquatic plant restoration, they also have shortcomings. Firstly, the realization of the technical measures has certain limitation, such as that most lakes and reservoirs cannot freely regulate the water level, and the flocculation precipitation by a chemical method and the biological method of putting mussels on a large scale are easy to produce regeneration pollution; secondly, the survival rate of seedlings is low, and the seedlings can not survive even in a water body with serious pollution; thirdly, the established aquatic vegetation lacks durability, and the aquatic vegetation collapses immediately after the manual repair measures are removed. The reasons for this are mainly two: (1) The underwater light field is not suitable for the growth of aquatic plants, and the water transparency is low due to a large amount of floating algae, suspended particles and especially soluble colored organic matters, so that the intensity of photosynthetic effective radiation is reduced. (2) The excessively high nitrogen and phosphorus nutrient salts have an inhibitory effect on the activities of superoxide dismutase and peroxidase in cells, thereby stressing the germination and growth of aquatic plant seeds.
Disclosure of Invention
The invention aims to: in order to overcome the defects in the prior art, the invention provides an underwater light field-water quality regulating device for aquatic plant recovery, which focuses sunlight through an optical lens, filters sunlight components by utilizing an optical filter, selects specific wave bands required by aquatic plant seed germination and growth stages, transmits effective illumination to the water by using an optical fiber based on a total reflection principle, and constructs an underwater sunlight optical fiber leading-in system, so that the underwater light field of a degenerated lake ecological system can be improved, and the light intensity and light quality required by aquatic plant growth and propagation are met. Meanwhile, the photocatalytic reaction of the graphene nano photocatalytic material under ultraviolet irradiation is utilized, so that organic pollutants in the deteriorated water body are reduced, and the stress pressure of the organic pollutants on the germination and growth of the aquatic plant seeds is reduced.
The technical scheme is as follows: in order to solve the technical problems, the underwater light field-water quality regulation device for aquatic plant recovery comprises a floating platform, wherein an illumination collection device is arranged on the floating platform and is connected with a light conduction device positioned on the floating platform, an ultraviolet light and visible light filter is arranged on the light conduction device and is connected with a filter replacement device, a plurality of optical fibers are connected to the tail of the light conduction device, the optical fibers are connected with a diffuse light emitter on an underwater bracket, and the bracket is connected with the floating platform through a first spring; the support is also provided with an underwater monitoring system, the monitoring system is connected with a controller, and the controller is connected with the optical filter replacing device.
Preferably, the filter replacing device comprises a first shell and a second shell which are communicated with the light conduction device, wherein the first shell and the second shell are positioned at the same horizontal position, and the ultraviolet light filter and the visible light filter are positioned at the same horizontal position. Therefore, the optical filter in the light path is only required to be arranged at one position, guide rails are arranged in the first shell and the second shell, the ultraviolet light filter and the visible light filter in the first shell and the second shell are respectively connected with the first connecting rope and the second connecting rope, a second spring is further arranged between the ultraviolet light filter and the visible light filter and the shell, a motor is arranged on the floating platform, a first motor shaft and a second motor shaft are arranged at two ends of the motor, the first connecting rope and the second connecting rope are respectively connected with the first motor shaft and the second motor shaft, and winding directions of the first connecting rope and the second connecting rope on the first motor shaft and the second motor shaft are opposite; when the motor works, one of the first connecting rope and the second connecting rope is in a winding state, the other one of the first connecting rope and the second connecting rope is in a paying-off state, the optical filter is driven to move on the guide rail through the connecting rope, and the optical filter is reset through the second spring.
Preferably, the controller is connected with an underwater monitoring system, and the underwater monitoring system recognizes morphological characteristics of the aquatic plants through an underwater high-definition camera, so that the growth of the aquatic plants is divided into two stages, namely a seed germination stage and a plant growth stage. In the seed germination stage, the controller drives the ultraviolet light filter in the first shell to work through the first connecting rope, so that the excitation of ultraviolet light on the photocatalytic reaction of the graphene nano material is realized, and the organic pollutants in the deteriorated water body are reduced; in the plant growth stage, the controller drives the visible light filter in the second shell to work through the second connecting rope, so that the photosynthesis of the aquatic plants is improved, and the growth process of the aquatic plants is promoted.
Preferably, the graphene nano photocatalytic material is sprayed on the outer surface of the optical fiber. The optical fiber is characterized in that the cladding and the coating are transparent, so that a part of sunlight can be refracted out of the optical fiber wall, and can generate photocatalytic reaction under the excitation of the sunlight penetrating through the optical fiber wall to release substances with stronger oxidizing ability such as superoxide radical, hydroxyl radical, singlet oxygen and the like. The species has the function of degrading organic pollutants in the mineralized water body so as to relieve the stress pressure of the polluted water quality on the germination process of the aquatic plant seeds. In order to strengthen the photocatalytic reaction at the stage, an ultraviolet light filter is arranged on the light conduction device, and only ultraviolet light passes through (the graphene nano photocatalytic material has the highest reaction efficiency in the ultraviolet light band).
Preferably, storage holes are formed in the periphery of the underwater support, aquatic plant growth promoter particles are placed in the storage holes, and a plurality of small holes are formed in the storage holes. As the aquatic plant growth promoter particles are gradually dissolved in water, the weight of the underwater bracket is gradually reduced. Therefore, along with the growth of the aquatic plants, the first spring enables the whole underwater bracket to slowly move upwards, so that the optimal illumination distance between the diffuse light emitter and the aquatic plants is ensured to be maintained all the time, and the faster growth of the aquatic plants is promoted. Meanwhile, after the aquatic plant growth promoter particles are dissolved in water, the content of plant active enzyme in the water body is increased, the root system growth of the aquatic plants is promoted, and the growth of the different-speed growth period of the aquatic plants is facilitated.
The application method of the underwater light field-water quality regulation device for aquatic plant recovery comprises the following steps:
(1) The device is placed in a water body with lower transparency and deteriorated water quality, and proper amount of aquatic plant growth promoter particles are filled in the underwater bracket, so that the diffuse light emitter on the underwater bracket is positioned at proper water depth;
(2) The underwater monitoring system shoots morphological characteristics of the aquatic plants, and the controller identifies seed germination stage and plant growth stage of the aquatic plants by processing the pictures and controls the motor to drive the ultraviolet light filter or the visible light filter to be replaced. The steps enable ultraviolet light to strengthen the photocatalytic reaction of the graphene nano material and reduce organic pollutants in the water body in the seed germination stage; in the plant growth stage, visible light promotes photosynthesis of aquatic plants and promotes the nutrition growth process of the aquatic plants.
The device divides the growth of aquatic plants into two stages, namely a seed germination stage and a plant growth stage, through an underwater monitoring system. In the seed germination stage, the organic pollutants in the deteriorated water body are reduced through the stimulation of ultraviolet light to the photocatalytic reaction of the graphene nano material; in the plant growth stage, photosynthesis of aquatic plants is promoted by visible light, and the growth process of the aquatic plants is promoted. The optimal illumination distance between the diffuse light emitter and the aquatic plants is maintained, namely the illumination intensity is about 10000Lux. Research shows that sunlight is focused through an optical lens, sunlight components are filtered through a filter, illumination with specific wavelength is selected according to different growth stages of aquatic plants, effective illumination is transmitted to the water through a light guide fiber based on a total reflection principle, and an underwater light field and water quality of a degenerated lake ecological system can be improved by constructing an underwater sunlight optical fiber introduction system, so that water environment required by growth and propagation of the aquatic plants is met. Meanwhile, under the illumination condition, the surface of the graphene nano photocatalytic material can form photocatalytic reaction similar to photosynthesis, and hydroxyl free radicals, singlet oxygen, active oxygen and the like with high oxidizing capacity are generated, so that the graphene nano photocatalytic material has great potential in controlling floating algae in eutrophic water and degrading organic pollutants in mineralized water. The high-definition camera of the underwater monitoring system is used for identifying seed germination and growth stages, and can monitor the state of aquatic plants in real time. When the aquatic plant is in the seed germination stage, the promotion effect of ultraviolet light on the photocatalytic reaction of the graphene nano material is utilized, so that organic pollutants in the deteriorated water body are reduced, and the stress pressure of high nutrient salt on the seed is reduced. When the aquatic plants enter the nutrition growth stage, the camera transmits data to the mobile phone or the PC end, and the filter changing device is started in time, so that only visible light is transmitted through the light collecting piece, ultraviolet rays and other harmful rays are filtered, and the damage of the ultraviolet rays and other harmful rays to the aquatic plant seedlings is reduced. The bottom of the sunlight guiding system is a diffuse light emitter, and sunlight guided by the optical fiber can be scattered into the water in a linear or planar mode.
According to the invention, sunlight is focused through the optical lens, sunlight with different wavelengths is intercepted by the filter, ultraviolet rays are selected in the seed germination stage to promote the photocatalytic reaction of the graphene nano photocatalytic material, and the purpose of improving water quality is achieved; and the visible light is selected in the growth stage of the aquatic plants, harmful rays are intercepted, and the photosynthesis efficiency of the aquatic plants is improved. In conclusion, the invention uses the optical fiber to transmit the effective illumination to the water based on the total reflection principle, combines the graphene nano photocatalytic material, can improve the underwater light field and water quality of the degenerated lake ecological system, and meets the water environment required by the growth and propagation of aquatic plants.
The beneficial effects are that: according to the underwater light field-water quality regulation device for aquatic plant recovery, sunlight is focused through the optical lens, sunlight components are intercepted by the filter, specific wave bands required by aquatic plants in different growth stages are selected, effective illumination is transmitted to the water by the light guide fiber based on the total reflection principle, and the graphene nano photocatalytic material is combined, so that the underwater light field and water quality of a degenerated lake ecological system can be improved, and the water environment required by aquatic plant growth and propagation is met.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic diagram of a motor structure according to the present invention.
Fig. 3 is a schematic structural view of the filter replacing apparatus according to the present invention.
Fig. 4 is a schematic structural view of an optical fiber.
In the figure: 1. an illumination collection device; 2. a first housing; 3. a floating platform; 4. a first spring; 5. an underwater bracket; 6. a light conducting device; 7. an optical fiber; 8. a diffuse light emitter; 9. an underwater monitoring system; 10. an underwater bracket; 11. a second housing; 12. a motor; 13. a first motor shaft; 14. a second motor shaft; 15. a first connecting rope; 16. an ultraviolet filter; 17. a second spring; 18. graphene nano photocatalytic material.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1 to 3, the underwater light field-water quality control device for aquatic plant restoration comprises a floating platform 3, wherein the floating platform 3 is mainly used for bearing each structure to float on the water surface. The light collecting device 1 is arranged on the floating platform 3, the light collecting device 1 mainly collects sunlight, the light collecting device 1 is connected with the light conduction device 6 positioned on the floating platform 3, the light conduction device 6 is provided with an ultraviolet light filter 16 and a visible light filter, the filters are connected with a filter replacing device, the tail part of the light conduction device 6 is connected with a plurality of optical fibers 7, and the outer surface of the light conduction device is sprayed with a graphene nano photocatalytic material 18; the optical fiber 7 is connected with a diffuse light emitter 8 positioned on a bracket 10, and the bracket 10 is connected with the floating platform 3 through a first spring 4; the support 10 is also provided with an underwater monitoring system 9, the monitoring system is connected with a controller, and the controller is connected with the optical filter replacing device.
In the invention, the filter replacing device comprises a first shell 2 and a second shell 11 which are communicated with a light conduction device 6, guide rails are arranged in the first shell 2 and the second shell 11, an ultraviolet light filter 16 and a visible light filter in the first shell 2 and the second shell 11 are respectively connected with a first connecting rope 15 and a second connecting rope, a second spring 17 is arranged between the ultraviolet light filter 16 and the visible light filter and the shells, a motor 12 is arranged on the floating platform 3, a first motor shaft 13 and a second motor shaft 14 are arranged at two ends of the motor 12, the first connecting rope 15 and the second connecting rope are respectively connected with the first motor shaft 13 and the second motor shaft 14, and the winding directions of the first connecting rope 15 and the second connecting rope on the first motor shaft 13 and the second motor shaft 14 are opposite; when the motor 12 works, one of the first connecting rope 15 and the second connecting rope is in a wire-collecting state, the other is in a wire-releasing state, the optical filter is driven to move on the guide rail through the connecting rope, and the optical filter is reset through the second spring 17.
In the invention, the storage holes 5 are arranged around the bracket 10, aquatic plant growth promoter particles are placed in the storage holes 5, and a plurality of small holes are arranged on the storage holes 5. The weight of the underwater stent 10 gradually becomes light as the aquatic plant growth promoter particles are gradually melted in water. Therefore, the first spring 4 gradually moves up the whole bracket 10 along with the time, so that the optimal illumination distance between the diffuse light emitter 8 and the aquatic plants is always maintained, and the aquatic plants are promoted to grow faster. Meanwhile, after the aquatic plant growth promoter particles are dissolved in water, the content of plant active enzyme in the water body is increased, the root system growth of the aquatic plants is promoted, and the growth of the different-speed growth period of the aquatic plants is facilitated.
In the invention, the outer surface of the optical fiber 7 is sprayed with a graphene nano photocatalytic material. The optical fiber 7 is characterized in that the cladding and the coating are transparent, so that a part of sunlight can be refracted out of the optical fiber 7 wall, and can generate photocatalytic reaction under the excitation of the sunlight penetrating the optical fiber 7 wall to release substances with stronger oxidizing ability such as superoxide radical, hydroxyl radical, singlet oxygen and the like. The species has the function of degrading organic pollutants in the mineralized water body so as to relieve the stress pressure of the polluted water quality on the germination process of the aquatic plant seeds. In order to strengthen the photocatalytic reaction at the stage, a filter is arranged on the light-collecting sheet, and ultraviolet light only passes through (the graphene nano photocatalytic material has highest reaction efficiency in the ultraviolet light band).
A method of using a device for improving underwater light field-water quality of aquatic plants, comprising the steps of:
(1) Placing the device in a water body with lower transparency and deteriorated water quality, and filling a proper amount of aquatic plant growth promoter particles on the bracket 10, so that the diffuse light emitter 8 on the bracket 10 is positioned at a proper water depth;
(2) The monitoring system shoots morphological characteristics of the aquatic plants, and the controller recognizes seed germination stage and plant growth stage of the aquatic plants by processing the pictures and controls the motor 12 to drive the ultraviolet light filter 16 or the replacement of the visible light filter. The steps enable ultraviolet light to strengthen the photocatalytic reaction of the graphene nano material and reduce organic pollutants in the water body in the seed germination stage; in the plant growth stage, visible light promotes photosynthesis of aquatic plants and promotes the growth process of the aquatic plants.
(3) Along with the growth process of the aquatic plants, the aquatic plant growth promoter particles in the underwater bracket are continuously melted, the weight of the aquatic plant growth promoter particles is reduced, the underwater bracket is caused to slowly move upwards, the optimal illumination distance between the diffuse light emitter and the aquatic plants is ensured to be maintained all the time, and the faster growth of the aquatic plants is promoted.

Claims (3)

1. An underwater light field-water quality regulation and control device for aquatic plant recovery, which is characterized in that: the device comprises a floating platform, wherein an illumination collection device is arranged on the floating platform and is connected with a light conduction device positioned on the floating platform, an ultraviolet light filter and a visible light filter are arranged on the light conduction device, the filters are connected with a filter replacement device, a plurality of optical fibers are connected to the tail of the light conduction device and are connected with a diffuse light emitter on an underwater bracket, and the underwater bracket is connected with the floating platform through a first spring; the underwater bracket is also provided with a monitoring system, the monitoring system is connected with a controller, and the controller is connected with the optical filter replacing device; the optical filter replacing device comprises a first shell and a second shell which are communicated with the light conduction device, guide rails are arranged in the first shell and the second shell, an ultraviolet light filter and a visible light filter in the first shell and the second shell are respectively connected with a first connecting rope and a second connecting rope, and a second spring is arranged between the ultraviolet light filter and the visible light filter and between the ultraviolet light filter and the second shell; the floating platform is provided with a motor, two ends of the motor are provided with a first motor shaft and a second motor shaft, the first connecting rope and the second connecting rope are respectively connected with the first motor shaft and the second motor shaft, and winding directions of the first connecting rope and the second connecting rope on the first motor shaft and the second motor shaft are opposite; the outer surface of the optical fiber is sprayed with a graphene nano photocatalytic material; when the motor works, one of the first connecting rope and the second connecting rope is in a winding state, and the other one of the first connecting rope and the second connecting rope is in a paying-off state; the controller is connected with the underwater monitoring system, the seed germination and growth stage of the aquatic plant is identified through the underwater high-definition camera, and in the seed germination stage, the controller drives the first connecting rope to work through the first motor shaft so as to realize the replacement of the ultraviolet light filter; in the growth stage, the controller drives the second connecting rope to work through the second motor shaft, so that the replacement of the visible light filter is realized.
2. The underwater light field-water quality regulation device for aquatic plant restoration of claim 1, wherein: storage holes are formed in the periphery of the underwater support, and aquatic plant growth promoter particles are arranged in the storage holes.
3. A method of using the underwater light field-water quality regulation device for aquatic plant restoration as set forth in claim 1 or 2, comprising the steps of:
(1) The device is placed in a water body with lower transparency and deteriorated water quality, and proper amount of aquatic plant growth promoter particles are filled in the underwater bracket, so that the diffuse light emitter on the underwater bracket is positioned at proper water depth;
(2) The underwater monitoring system shoots morphological characteristics of the aquatic plants, the controller identifies seed germination stages or plant growth stages of the aquatic plants by processing the pictures, and when the aquatic plants are in the seed germination stages, the controller controls the motor to drive the ultraviolet light filter to work; when the plants enter the growth stage, the motor is reversed, the ultraviolet light filter is pulled out of the light path, and the visible light filter enters the light path;
(3) Along with the growth process of the aquatic plants, the aquatic plant growth promoter particles in the underwater bracket are continuously melted, the weight of the aquatic plant growth promoter particles is reduced, the underwater bracket slowly moves upwards, the optimal illumination distance between the diffusion illuminator and the aquatic plants is always maintained, and the faster growth of the aquatic plants is promoted.
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