CN113955856A - Artificial island for purifying water quality of river channel and restoring ecology - Google Patents
Artificial island for purifying water quality of river channel and restoring ecology Download PDFInfo
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Classifications
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- C—CHEMISTRY; METALLURGY
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
Abstract
The invention discloses an artificial island for purifying water quality of a river channel and restoring ecology, and relates to the technical field of ecological management. The suspension filler area can adsorb and remove heavy metals such as Cr, Pb, Cd and the like in the urban river water body, and can effectively reduce pollutants such as COD, N, P and the like in the water body. A good river wetland and terrestrial ecological environment is built in the near-natural structure area, and an environmental space which meets the inhabitation and the multiplication of organisms such as amphibians, reptiles, insects, birds and the like and the growth of shrubs and small trees is built. The natural stone layer serving as the hard framework of the artificial island is provided with a large number of holes, so that a place for small fishes, small mollusks and fishes in the juvenile period to avoid natural enemies is provided, and the number of urban river biological populations is increased.
Description
Technical Field
The invention belongs to the technical field of ecological management, and particularly relates to an artificial island for purifying water quality of a river channel and restoring ecology.
Background
Rivers are the origins of human civilization, and since ancient times, human production and construction and the origins and development of civilization are all closely inseparable connected with rivers. Nowadays, rivers flowing through cities still play a great role in city construction, development and prosperity. Rivers flowing through cities provide stable and sufficient water sources for urban resident life and industrial production, and also serve as places for finally receiving sewage discharged from cities. The urban rivers make great contribution to the flood control and drainage of cities, and simultaneously, the infiltration of river water bodies to soil also effectively supplements urban underground water, thereby greatly improving the water storage capacity of the cities. In addition, urban rivers play a role in building urban landscapes and serving as daily leisure activity sites for urban residents. The natural nature of the close water of the human beings, the river landscape structure of the urban river self evolution and the human construction provide good leisure activity places for the residents living in the city, and the mental life level of the residents in the city is improved.
It is less of a concern that urban rivers also have the function of serving the urban river ecosystem. The urban rivers provide places for living and breeding animals, plants and microorganisms, and the natural environment of the urban rivers and various living organisms form an urban river ecosystem. However, with the development of cities and the rapid increase of urban residents, the total amount of pollutants discharged into urban rivers by human activities is also rapidly increasing, which greatly aggravates the water pollution of the urban rivers. The data of the urban river water quality in 2015 by the national statistical office in China shows that 78% of the urban river water quality in China cannot meet the III-class water standard on the earth surface, namely the environmental quality standard GB3838-2002 for the earth surface water. In addition, in order to meet the requirement of flood control, the urban rivers are often subjected to engineering reconstruction, such as the adoption of a hardened bank, the bending and straightening, and the like, and the engineering measures certainly improve the flood control and discharge capacity of the urban rivers, but greatly destroy the ecological attributes of the urban rivers. The water quality deterioration of the urban rivers and the engineering reconstruction of the urban rivers by human beings cause destructive damage to the ecological system of the urban rivers, so that animals and plants in the urban rivers are rapidly reduced, the urban rivers lose the original vitality and fall into urban drainage ditches.
China makes many efforts in the aspect of urban river water quality purification every year, and engineering treatment measures such as river channel dredging and water quality purification pump stations arranged along rivers are adopted and are staged, however, the cost of the engineering river treatment measures is large. In addition, at present, the treatment of urban rivers in China still mainly aims to improve the water quality of the urban rivers, and the attention on the aspect of recovering the urban river ecosystem is less. Under the large background that the ecological civilization construction of China is gradually developed, the ecological restoration of urban rivers is imperative in China. Therefore, an artificial island for purifying and ecologically restoring the water quality of the river is provided.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides an artificial island for river water purification and ecological restoration. The artificial island can purify the water quality of urban rivers, can improve the naturalness of the urban rivers, provides habitats and shelters for animals and plants of the urban rivers, and has great application prospect in the aspects of water quality purification and ecological restoration of the urban rivers.
In order to achieve the purpose, the invention adopts the following technical scheme:
the artificial island for purifying the water quality of the river channel and ecologically restoring the water quality of the river channel is designed, and comprises an artificial island body, wherein the artificial island body comprises a near natural structure area and a suspension filler area, the natural structure area and the suspension filler area respectively bear the functions of ecological restoration and water quality purification of the artificial island, the natural structure area provides a good living and inhabiting place for fishes, amphibians, mollusks, insects, reptiles, birds and the like in the river, a groove body is arranged in the near natural structure area, the suspension filler area is positioned in the groove body, and the suspension filler area is positioned in the center and the top of the artificial island body and is completely surrounded by the near natural structure area; the natural stone layer, the filling layer and the vegetation layer are sequentially arranged in the near-natural structure area from bottom to top, the underwater part of the natural stone layer provides a place for small fishes, small mollusks and fishes in the juvenile period to avoid natural enemies, the population quantity of the fishes in urban rivers is favorably increased, the filling layer is humus suitable for plant growth, and the average thickness of filling is not less than 0.8 m; the near-natural structure area slowly transits into the water body to form a vegetation layer of a slope platform structure, and the platform is used for establishing the connection between the water body and the land and providing a place for amphibians to move; modified activated carbon suspended filler is filled in the suspended filler area; the periphery of the near natural structure area and the periphery of the suspension filler area are provided with guard piles at equal intervals to form a hard framework, and the strength and the stability of the guard piles can ensure that the guard piles are not damaged and inclined under the action of water flow impact and the horizontal pressure of natural stones and filling soil in the near natural structure area.
Furthermore, the artificial island body is arranged at the center or near-center area of the river channel, the distance between the near-shore edge and the river bank is not less than 3m, the position of the artificial island and the distance between the artificial island and the river bank are set based on the consideration of avoiding adverse influence of human activities on the ecological environment of the artificial island, the average width of the river channel is not less than 10m, the average depth of the river channel is not more than 3.5m, the average depth of riverbed sludge of the artificial island body is not more than 0.8m, and the limit is made on the average width of an urban river applicable to the artificial island. The limiting condition of the average depth of the river bed sludge is to ensure the stability of the artificial island, and the excessive thickness of the river bed sludge can cause the later-stage sedimentation of the constructed artificial island, so that the due function of the artificial island is probably lost.
Furthermore, the planar shape of the artificial island body is irregular long strip shape or oval shape along the river course direction, and the ratio of the longest distance of the artificial island body along the river course direction to the widest distance perpendicular to the river course direction is 2-3.5: 1, the ratio of the widest distance of the artificial island body perpendicular to the river channel direction to the width of the river channel section is 1: 2 to 3. The planar shape of the artificial island simulates the general shape of the island in the natural river formed by the natural evolution of the river through sedimentation, so that the artificial island has more advantages in both natural aesthetic sense and ecological restoration function. The length and width of the artificial island are selected based on the comprehensive consideration of ensuring the stability and permeability of the artificial island along the longitudinal direction of the river. The ratio of the length to the width of the artificial island is reduced, so that the stability of the artificial island along the longitudinal direction of the river is reduced, and the permeability is increased; and the ratio of the length to the width is increased, so that the stability of the composite material along the longitudinal direction of the river flow is increased, and the permeability is reduced. The ratio of the width of the artificial island to the width of the river is selected to ensure that the artificial island has enough planning width and area to meet the requirement that the artificial island bears the water quality purification and ecological restoration functions of the urban river, and to achieve the purpose that the water flow rate of the river section at the artificial island is properly increased to form the local scouring and deposition of the river and gradually evolve into a deep pool-shoal structure which is favorable for the survival and reproduction of fishes.
Furthermore, the area of the suspended filler area is 1/4-1/3 of the area of the artificial island, and the suspended filler area is rectangular, circular or elliptical. The area ratio of the suspended filler region is a reasonable plan for balancing the functions of the artificial island in the aspects of urban river water quality purification and ecological restoration.
Furthermore, the outside of the suspended filler is wrapped by a high-density polyethylene mesh ball, the diameter of the high-density polyethylene mesh ball is about 150mm, the main raw material of the modified biological activated carbon filler is coconut shells, and a large number of tests prove that the modified biological activated carbon filler has high adsorption removal rate on heavy metals such as Cr, Pb, Cd and the like in a water body. Particularly, the adsorption removal rate of the modified biological activated carbon filler on Cr (IV) in a water body can reach more than 99%. Meanwhile, the modified biological activated carbon has porous structure and rough surface structure, so that the modified biological activated carbon can be used as a carrier of a biological membrane, can enrich a large amount of functional microorganisms, and can remarkably reduce water pollutants such as COD (chemical oxygen demand), N (nitrogen), P (phosphorus) and the like in water so as to purify urban river water.
Furthermore, a metal net is arranged at the top of the suspended filler area, and the aperture of the metal net is not more than 1/2 of the diameter of the net ball of the suspended filler. The metal mesh arranged in the suspended filler area is used for preventing the suspended filler from being washed away by rising river water in a flood period.
Furthermore, the bottom of the natural stone layer is filled with all river bed sludge matrixes, the depth of the sludge penetrating into the river bed is not less than 0.5m, the reason that the river bottom sludge is filled in the natural stone layer and the sufficient soil penetration depth is met is that the settlement in the later period after the artificial island is built is reduced, the surface pores are filled with broken stones in the natural stone layer, and an isolation layer is formed between the natural stone layer and the filling layer by the broken stones. The natural stone blocks are stone blocks with an average mass of 15-40 kg and irregular shapes, and the crushed stones filled on the surface of the natural stone block layer are stone blocks with an average mass of 100-500 g and irregular shapes. The isolation layer can effectively avoid the filling layer to fall into the natural stone layer space and be washed away by rivers and the filling loss that causes.
Further, the gradient of the near-natural structure area is 1: 10-15, the edge of the near-natural structure area is lower than the annual average water level of the river channel by more than 0.15m, the top of the near-natural structure area is higher than the annual average water level of the river channel by more than 1.2m, and the top of the natural stone layer is higher than the annual average water level of the river channel by more than 0.3 m.
Furthermore, the vegetation layer is divided into a wet vegetation layer close to the water body and a woody vegetation layer far away from the water body, the wet vegetation layer is positioned on the natural stone layer including above and below water, the woody vegetation layer is positioned on the filling soil layer, and the woody vegetation layer is small shrub and small trees with good water resistance. Platforms for the aquatic portion of a naturally constructed area and the hydrophytes, small shrubs and small trees planted thereon provide a habitat for insects, amphibians, reptiles, birds and the like. Meanwhile, the trees growing vigorously can also shield the suspended filler area in the center of the artificial island, thereby eliminating the artificial construction traces and creating the natural landscape effect of the artificial island.
Furthermore, the guard piles are reinforced concrete guard piles, the pile spacing of the guard piles is about 300mm, and the bottoms of the guard piles are deeply inserted into the riverbed. The aim of making the requirements for the average quality of natural stone blocks and the pile spacing, strength and stability of the reinforced concrete piles is to maintain the stability of the hard framework of the artificial island.
The artificial island for purifying the water quality of the river channel and restoring the ecology has the advantages that:
(1) the artificial island provided by the invention has the functions of purifying urban river water and restoring ecology. The suspended filler area in the center of the artificial island has high adsorption removal rate on Cr, Pb and Cd in the river water body, and the porous structure and the rough surface of the suspended filler area can be used as carriers of biological films to enrich a large number of functional bacteria, so that pollutants such as COD, N, P and the like in the river water body are effectively reduced. A near-natural structure area surrounding a suspended filler area in the artificial island is surrounded by a middle ring to create a good river wetland and terrestrial ecological environment, and an environmental space which meets the inhabitation and reproduction of organisms such as amphibians, reptiles, insects, birds and the like and the growth of hygrophytes, shrubs and small trees is created. The ecological system of the urban river central island full of living organisms can be formed through natural evolution of years.
(2) Compared with the currently commonly used bricks, stones and concrete, the natural stone blocks for constructing the hard skeleton of the artificial island, provided by the invention, have lower price, and have higher porosity and permeability on the premise of meeting the requirements of strength and stability of the artificial island. The underwater part of the natural stone layer provides a place for small fishes, small mollusks and fishes in the juvenile period to avoid natural enemies, and is favorable for improving the population quantity of fishes in urban rivers. The good permeability of the natural stone layer enables the river water body to penetrate through and reach the central suspended filler area, and the water quality purification process is completed.
(3) The artificial island provided by the invention compresses the river section to cause river scouring and sedimentation, and a river deep pool-shoal structure (see figure 3) is formed after long-term evolution, and the river shoal structure has excellent photo-thermal conditions, is favorable for growing algae, aquatic weeds, aquatic insects and mollusks, and can provide foraging, inhabiting and reproducing places for fishes, amphibians and birds. The river deep pool area is a place for fish and various mollusks to rest and avoids summer heat and invasion of natural enemies. The deep pool-shoal structure of the urban river creates different flow rates and habitats of the river, and is favorable for improving the biological diversity of the urban river.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic plan layout of the present invention;
FIG. 2 is a schematic cross-sectional view 1-1 of the present invention in relation to the artificial island of FIG. 1;
FIG. 3 is a plan view of the river of the invention in an artificial island and deep pool-shoal configuration;
labeled as: 1. a river channel; 2. an artificial island body; 3. a near natural structure region; 4. a suspended filler region; 5. pile protection; 6. a trough body; 61. suspending the filler; 7. a water level; 8. a riverbed; 9. a natural stone layer; 10. filling a soil layer; 11. a metal mesh; 12. constructing a deep pool; 13. a shoal structure; 14. a wet-grown vegetation layer; 15. a woody vegetation layer.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "provided with", "connected" and the like are to be construed broadly, such as "connected", may be fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The structural features of the present invention will now be described in detail with reference to the drawings (see fig. 1-2) of the specification.
Example 1
The method specifically comprises the following steps: the engineering case is implemented in 4 months of 2020 and completed in 4 months of 2021, and is addressed to a certain river reach in Nanjing. Hydrogeological data of the river reach is obtained by collecting hydrogeological data of the river reach and actual field investigation (table 1).
TABLE 1 hydrological and geological data of the interval segment of the nine-village river in Nanjing City in the fairy and Zhigu avenues
According to the national 'quality standard of surface water environment' (GB3838-2002), the water quality of the river reach belongs to V-class water.
In specific implementation, 12 artificial island bodies 2 are built in the river reach, and the average distance between adjacent artificial island bodies 2 is 450 m. One of the artificial island bodies 2 is selected below, and the invention is further explained with reference to fig. 1-2 as follows:
the constructed artificial island body 2 is distributed in the center or near-center area of the river channel 1, and the distances between the near-shore points of the two side edges and the river bank are respectively 4.1m and 5.3 m. The plane shape of the artificial island body 2 is irregular and long in shape along the direction of the river channel 1, and the ratio of the longest distance along the direction of the river channel 1 to the widest distance perpendicular to the direction of the river channel 1 of 6.6m is about 3.1: 1, and the ratio of the widest distance 6.6m of the artificial island body 2 perpendicular to the direction of the river channel 1 to the section width 17.1m of the river channel 1 is 1: 2.6. the artificial island body 2 consists of two parts, namely a near-natural structure region 3 and a suspended filler region 4. The suspended filler region 4 is located at the center and the top of the artificial island body 2 and is completely surrounded by the near-natural formation region 3. The near natural formation area 3 is composed of a lower layer of natural stone 9 and an upper layer of fill 10. And the surface pores are filled with the crushed stones on the surface layer of the natural stone layer 9. The outer edge of the suspension filling area 4 and the outer edge of the near-natural structure area 3 are provided with guard piles 5 made of reinforced concrete. The natural stone layer 9 (including above water and under water) on the outer edge of the artificial island body 2 is mainly planted with a hygrophytic vegetation layer 14, specifically calamus flavus, iris citrina, cattail, rhizoma alismatis, copper cash and the like, and the soil filling layer 10 on the inner edge of the artificial island body 2 is planted with a woody vegetation layer 15, which is small shrub and small trees with good water resistance, specifically medlar, winter jasmine, golden side boxwood, weeping willow, Chinese red pine and the like. The suspended filler 61 of the suspended filler area 4 is a modified biological activated carbon filler wrapped by high-density polyethylene reticular spheres. The diameter of the high density polyethylene mesh spheres is about 150 mm. The modified biological activated carbon filler is independently researched and developed by a company, and the raw material is coconut shell.
The natural stone 9 at the lower layer of the near-natural structure area 3 is a stone with an average mass of about 30kg and an irregular shape, and the crushed stone filled on the surface of the natural stone layer is a stone with an average mass of about 300g and an irregular shape. The natural stone layer 9 fills the sludge matrix of the whole river bed 8 and the depth of the sludge matrix penetrating into the river bed 8 is 0.8 m. The edge of the near natural structure area 3 is 0.2-0.35 m lower than the 1-year average water level of the river channel, the top of the near natural structure area is 1.5m higher than the 1-year average water level of the river channel, and the top of the natural stone layer 9 is 0.5m higher than the 1-year average water level of the river channel. The upper filling layer 10 of the near-natural structure area 3 is humus soil suitable for plant growth, and the average thickness of the filling is 0.8 m. The reinforced concrete pile adopts a rectangular pile with the length of 30cm multiplied by 15cm multiplied by 5m, the pile distance is about 300mm, and the depth of the reinforced concrete pile is 2.7m when the reinforced concrete pile is deeply inserted into a riverbed 8. The slope of the near natural formation area is 1: 15.
The suspended filler region 4 of 26m2 is approximately 1/4 of the artificial island area 104.7m2 and is rectangular in shape 2m x 13 m. And a metal net 11 for intercepting the suspended filler 61 is arranged above the suspended filler area 4, and the mesh size of the metal net 11 is 60mm and is 1/2 smaller than the suspended filler size.
The river course control project also adds more than 20 local aquatic or amphibian animals including crucian carp, white striped fish, pseudorasbora parva, green rice 40002fish, black shell shrimp, macrobrachium nipponensis, Chinese brachium nipponensis, river snail, freshwater mussel, toad, frog, finless eel, loach and the like, and plants more than 15 aquatic or hydrophytes including picrasma, waterweed, goldfish algae, calamus flavus, yellow iris, cattail angustifolia, rhizoma alismatis and cuprum.
Example 2
The embodiment selects another artificial island from the 12 artificial islands in the embodiment 1, and referring to fig. 1-2, as another preferred embodiment of the invention, the difference from the embodiment 1 is that the distances between the near-shore points of the two side edges of the artificial island body 2 and the river bank are 4.1m and 4.6m, respectively. The plane shape of the artificial island body 2 is approximately elliptical along the river channel 1, and the ratio of the longest distance 14.0m along the river channel 1 to the widest distance 6.7m vertical to the river channel 1 is about 2.1: 1, and the ratio of the widest distance 6.7m of the artificial island body 2 perpendicular to the direction of the river channel 1 to the section width 15.4m of the river channel 1 is 1: 2.3. the edge of the near natural structure area 3 is 0.15-0.3 m lower than the 1-year average water level of the river channel, and the top of the near natural structure area is 1.3m higher than the 1-year average water level of the river channel. The suspended filler region 424.8m2 is approximately 1/3 of the artificial island area 75.5m2 and is rectangular in shape 3.1m x 8 m. The rest of the implementation corresponds to example 1.
In 8 months at 2021, when the project is completed for 4 months, the average value of the water quality detection data of the river section is continuously 7 days (shown in table 2), and the average value of the water quality data of the river section is continuously 7 days along the river water quality purification pump station (shown in table 3).
Table 2 Water quality testing data of the Jiuxianghe river reach (2021.8.24 ~ 2021.8.30)
| Item | Numerical value (mg/L) |
| COD | 11.2 |
| TN | 0.8 |
| TP | 0.16 |
| Cr | 0.007 |
| Pb | Is lower than the detection limit |
| Cd | Is lower than the detection limit |
TABLE 3 quality data of water discharged from Jiuxiang riverside river water purification pump station
As can be seen from the data in Table 2, the water quality of the river reach class III water standard after 4 months of completion of the project. From the aspect of pollutant reduction, the contribution rates of the artificial island and river self-cleaning action on removing COD, TN and TP in the river water body are respectively 17.5%, 20.0% and 28.6%, and the contribution rates of the artificial island and river self-cleaning action on removing Cr, Pb and Cd in the river water body are all 100%. And from the effects of artificial islands and other ecological restoration measures, the temporary operation of 4 months is carried out, the population quantity of the fish in the river reach more than 15, the total population quantity of arthropods, mollusks, amphibians and reptiles reaches more than 10, and the total population quantity of hygrophytes and terrestrial plants reaches more than 20.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An artificial island for purifying water quality of a river channel and ecologically restoring comprises an artificial island body (2) and is characterized in that the artificial island body (2) comprises a near natural structure area (3) and a suspension filler area (4), wherein a groove body (6) is arranged in the near natural structure area (3), and the suspension filler area (4) is positioned in the groove body (6);
the natural stone block layer (9), the filling layer (10) and the vegetation layer are sequentially arranged in the near-natural structure area (14) from bottom to top;
the near-natural structure area (14) is slowly transited into the water body to form a slope platform;
the suspension filler region (4) is filled with modified activated carbon suspension fillers (61);
and guard piles (5) are arranged on the peripheries of the near-natural structure area (3) and the suspension filler area (4) at equal intervals to form a hard framework.
2. The artificial island for river water purification and ecological restoration according to claim 1, wherein the artificial island body (2) is arranged at the center or near-center area of the river (1), the near-shore edge is not less than 3m away from the river bank, the average width of the river (1) is not less than 10m, the average water depth of the river (1) is not more than 3.5m, and the average depth of the riverbed sludge of the artificial island body (2) is not more than 0.8 m.
3. The artificial island for river water purification and ecological restoration according to claim 2, wherein the planar shape of the artificial island body (2) is irregular long strip or ellipse along the direction of the river (1), and the ratio of the longest distance of the artificial island body (2) along the direction of the river (1) to the widest distance perpendicular to the river direction is 2-3.5: 1, and the ratio of the widest distance of the artificial island body (2) perpendicular to the direction of the river channel (1) to the width of the section of the river channel (1) is 1: 2 to 3.
4. The artificial island for river water purification and ecological restoration according to claim 1, wherein the area of the suspended filler region (4) is 1/4-1/3 of the area of the artificial island body (2), and the shape of the suspended filler region (4) is rectangular, circular or elliptical.
5. The artificial island for river water purification and ecological restoration according to claim 1, wherein the outside of the suspended filler (61) is wrapped by high density polyethylene mesh balls, and the diameter of the high density polyethylene mesh balls is about 150 mm.
6. The artificial island for river water purification and ecological restoration according to claim 5, wherein the top of the suspended filler region (4) is provided with a metal net (11), and the pore size of the metal net (11) is not larger than 1/2 of the diameter of the net-shaped ball of the suspended filler (61).
7. The artificial island for river water quality purification and ecological restoration according to claim 1, wherein the bottom of the natural stone layer (9) is filled with all silt matrixes of a river bed (8), the depth of the natural stone layer penetrating into the river bed is not less than 0.5m, surface pores of the natural stone layer (9) are filled with broken stones, the broken stones form an isolation layer between the natural stone layer (9) and a soil filling layer (10), the natural stone layer (9) is made of stones with irregular shapes, the average mass of the stones is 15-40 kg, and the surface of the natural stone layer (9) is filled with 100-500 g of stones with irregular shapes.
8. The artificial island for river water quality purification and ecological restoration according to claim 1, wherein the slope of the near natural structure area (14) is 1: 10-15, the edge of the near natural structure area (14) is lower than the annual average water level of the river (1) by more than 0.15m, the top of the near natural structure area (14) is higher than the annual average water level of the river (1) by more than 1.2m, and the top of the natural stone block layer (9) is higher than the annual average water level of the river (1) by more than 0.3 m.
9. The artificial island for river water quality purification and ecological restoration according to claim 8, wherein the vegetation layer comprises a wet vegetation layer (14) and a woody vegetation layer (15), the wet vegetation layer (14) is positioned on the exposed natural stone layer (9), and the woody vegetation layer (15) is positioned on the filling layer (10).
10. The artificial island for river water quality purification and ecological restoration according to claim 1, wherein the guard piles (5) are reinforced concrete guard piles, the pile pitch of the guard piles (5) is about 300mm, and the bottoms of the guard piles (5) are deeply inserted into the riverbed (8).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115093075A (en) * | 2022-06-16 | 2022-09-23 | 科盛环保科技股份有限公司 | Water activating method for river and lake blue algae prevention and ecological management |
| CN115093075B (en) * | 2022-06-16 | 2024-04-09 | 科盛环保科技股份有限公司 | Running water method for preventing and ecologically treating blue algae in river and lake |
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