CN108249579A - A kind of artificial swamp based on Solution of Flow in Curved Channel - Google Patents

A kind of artificial swamp based on Solution of Flow in Curved Channel Download PDF

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Publication number
CN108249579A
CN108249579A CN201810095779.8A CN201810095779A CN108249579A CN 108249579 A CN108249579 A CN 108249579A CN 201810095779 A CN201810095779 A CN 201810095779A CN 108249579 A CN108249579 A CN 108249579A
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China
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wetland
artificial swamp
river
channel
flow
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CN108249579B (en
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鲁春辉
张加旭
唐洪武
高成
孔俊
叶逾
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Hohai University HHU
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Hohai University HHU
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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
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/007Contaminated open waterways, rivers, lakes or ponds

Abstract

The invention discloses a kind of artificial swamp based on Solution of Flow in Curved Channel, including arc artificial swamp, wetland lower channel and wetland upper end pipeline;Arc artificial swamp is arranged at the concave bank of meandering rivers, and arc artificial swamp includes the plant on metalling, coarse sands layer, fine sand layer, soil horizon and the upper soil horizon of plantation successively from bottom to up;Wherein, the overhead height of fine sand layer mutually maintains an equal level with ordinary water level;One end of wetland lower channel is connected with meandering rivers, and the other end of wetland lower channel is connected with wetland lower port;One end of wetland upper end pipeline is connected with wetland upper port, and the other end of wetland upper end pipeline is provided with two furcation area pipes, respectively water purification drainpipe and sewage water inlet pipe.The present invention utilizes the favorable terrain of meandering rivers, without applying external force, can from river water lift, river is helped to reduce river water level and flood peak clipping flow in flood season, simultaneously, moreover it is possible to as eco-filtration medium, while river water is collected by filtration, moreover it is possible to treated sewage.

Description

A kind of artificial swamp based on Solution of Flow in Curved Channel
Technical field
The present invention relates to Design of Constructed Wetland and ecological restoration technical field, particularly a kind of based on the artificial of Solution of Flow in Curved Channel Wetland.
Background technology
With China's industrialization development, national economy is also fast-developing, while China is also faced with shortage of water resources and water The severe challenge of environmental degradation.On the one hand, due to eighties of last century, rainy dirty point of row and the sewage disposal of enterprise be not abundant over the ground Pay attention to, drainage project construction is incomplete, and the sanitary sewage and industrial wastewater for leading to city generation can only be discharged to city river, cause The river water body deterioration of the ecological environment forms the smelly river of urban black;On the other hand, major part city in China's is in monsoon weather, year, Ji Jiangyu distributions are extremely uneven, often to flood season when, the flood carrying capacity of city river is often insufficient, causes urban flooding calamity Evil is also in vain drained precious water resource by river.
At present, there is different solutions respectively for above-mentioned two aspects problem, such as rain dirt mixing problem, again Underdrainage system is rectified and improved, but cost of designing and constructing is high;For contaminating enterprises' discharge of wastewater problem, sewage treatment plant is set, A large amount of urban lands are occupied, while consume a large amount of electric power resources;For the needs of flood season flood passage, irregular dredging is also wanted, is increased River course flood area of section increases river maintenance cost.
It is well known that bending is presented in natural river course, in river corner river water except in addition to by gravity, while also by To the effect of centrifugal intertia force, river is made to generate bend secondary flow phenomenon in corner.Concave bank is directed toward in the direction of bend surface layer flow, River bottom is flowed away towards convex bank afterwards, after turn to the water surface and flow to concave bank, using this principle, ancient times, a large amount of hydraulic engineerings were in concave bank construction Diversion without dam engineering can smoothly obtain surface layer clear water.
At present, there are no the invention that flood season peak clipping and sewage disposal are combined to processing, therefore, Solution of Flow in Curved Channel is utilized Strong landform, inventing a kind of flood season can fetch water, sewage enter the one kind that can be filtered before river can to river water and sewage into The bi-directional filtered artificial swamp of row is particularly important.
Invention content
In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide one kind is based on Solution of Flow in Curved Channel Artificial swamp, should artificial swamp based on Solution of Flow in Curved Channel utilize meandering rivers favorable terrain, without apply external force, Bian Kecong Water lift in river helps river to reduce river water level and flood peak clipping flow in flood season, simultaneously, moreover it is possible to be situated between as eco-filtration Matter, while river water is collected by filtration, moreover it is possible to treated sewage.
In order to solve the above technical problems, the technical solution adopted by the present invention is:
A kind of artificial swamp based on Solution of Flow in Curved Channel, including arc artificial swamp, wetland lower channel and wetland upper end pipeline;
Arc artificial swamp is arranged at the concave bank of meandering rivers, and arc artificial swamp is arc-shaped, and radian and meandering rivers Curvature is consistent;Meandering rivers have ordinary water level and the design flood level above ordinary water level.
Arc artificial swamp includes metalling, coarse sands layer, fine sand layer, soil horizon and the upper soil horizon of plantation successively from bottom to up On plant;Wherein, the overhead height of fine sand layer mutually maintains an equal level with ordinary water level, and fine sand layer is set away from the top side of meandering rivers Wetland upper port is equipped with, the side of metalling towards meandering rivers is provided with wetland lower port.
One end of wetland lower channel is connected with meandering rivers, the other end and the wetland lower port phase of wetland lower channel It connects, preceding main gate is provided in the middle part of wetland lower channel, preceding main gate is normally opened gate.
One end of wetland upper end pipeline is connected with wetland upper port, and the other end of wetland upper end pipeline is provided with two pieces points Breeches pipe, wherein a furcation area pipe is water purification drainpipe, another furcation area pipe is sewage water inlet pipe, and sewage water inlet pipe passes through sewage pump It is connected with source of sewage;The crotch of two furcation area pipes is provided with two-way switch, and rear work is provided in the middle part of the pipeline of wetland upper end Make gate.
Soil layer thickness is 30cm-50cm, and medium presses 3 by loam, fine sand, river silt, carbon source, haydite:3:1:1:1 ratio Example is configured.
Xylophyta or herbaceous plant of the plant for energy absorbed nitrogen phosphorus, wherein, the planting density of xylophyta is 1 plant/m2, Herbal planting density is 5-6 plants/m2
Plant is shrub type willow, Lythrum salicaria or one kind in nutgrass flatsedge or combination.
Fine sand layer thickness is 60cm, the thin silicon that fine sand that medium is 0.2mm-0.3mm by grain size, grain size are 2mm-5mm Stone and grain size are the thin haydite compositions of 2mm-5mm, and each component ratio is 5:1:1, the infiltration coefficient of fine sand layer is in 8m/d-15m/d Between.
Coarse sands layer is made of the pure sand of 1mm-2mm, thickness 100cm.
Metalling is made of rubble of the particle diameter in 10mm-30mm, thickness 30cm.
One end that wetland lower channel is connected with meandering rivers is provided with trash rack for water inlet.
Fine-structure mesh grid is provided at wetland lower port.
By the switching of two-way switch, the collection of river water and the processing of sewage in meandering rivers can be realized, specially:When During in flood season, sewage water inlet pipe is closed, when river water level meets or exceeds design flood level, the pressure difference of river both sides generation And the effect of meandering rivers, the limpid river water in river surface layer is continually delivered in arc artificial swamp and is filtered, Most of river water after filtering will be collected preservation by drainpipe of intaking, and small part river water then under pressure, continues To being uploaded to soil horizon and root system of plant, meanwhile, root system of plant can also absorb the polluter being trapped in arc artificial swamp; When after flood season, river water level is fallen after rise, and river inside and outside differential pressure reduces, at this point, closing water purification drainpipe, opens sewage water inlet pipe, Sewage by pretreatment enters arc artificial swamp through sewage pump and is filtered processing, is ultimately discharged into river.
The present invention has the advantages that:
1)Using the favorable terrain of meandering rivers, without applying external force, can be reduced from river in flood season in water lift, help river River water level and flood peak clipping flow.
2)Arc artificial swamp is ecological filter medium, break original filtering medium can only filter sewage from top to bottom side Formula innovatively proposes a kind of filtering medium for allowing reciprocal filter process, increases the service efficiency of artificial swamp.
3)Using forward filter and the alternate process of reverse filtration, make to rest on pollutant in arc artificial swamp, miscellaneous Matter etc. constantly changes the position in arc artificial swamp, and the hole in arc artificial swamp is prevented to be blocked, and causes ecology wet The failure of ground function.
4)Arc artificial swamp upper strata is wetland garden, and lower floor is ecological filter medium, the plant planted in wetland garden The pollutant being trapped in filtering medium can be absorbed, increases the treatment effeciency of river water and sewage.Meanwhile lower floor's eco-filtration is situated between Matter provides for wetland garden plant and natively descends storage area, continually can provide water source for wetland plant growth, save The cost of man-made irrigation.
5)The river water of pollution is transported to city storage area after arc artificial swamp filtration treatment, by water purification outlet pipe Or Water District, increase water utilization rate, alleviate the pressure of city water resource shortage.
6)Wetland upper end pipe end is communicated by bifurcated pipe with water purification drainpipe and sewage water inlet pipe, double on bifurcated pipe To switch effectively prevent that treated water and the public pipeline of sewage, prevent from causing secondary pollution to the water purification of discharge.
Description of the drawings
Fig. 1 shows a kind of structure diagram of the artificial swamp based on Solution of Flow in Curved Channel of the present invention.
Fig. 2 shows Section A-A sectional view in Fig. 1.
Wherein have:10. arc artificial swamp;11. plant;12. soil horizon;13. fine sand layer;131. wetland upper port;14. Coarse sands layer;15. metalling;151. wetland lower ports;
20. wetland lower channel;21. trash rack for water inlet;Main gate before 22.;
30. wetland upper end pipeline;Main gate after 31.;32. two-way switch;33. drainpipe of intaking;34. sewage water inlet pipe;
40. meandering rivers;41. ordinary water level;42. design flood level.
Specific embodiment
The present invention is described in further detail with specific better embodiment below in conjunction with the accompanying drawings.
As depicted in figs. 1 and 2, a kind of artificial swamp based on Solution of Flow in Curved Channel, including arc artificial swamp 10, wetland lower end Pipeline 20 and wetland upper end pipeline 30.
Arc artificial swamp is arranged at the concave bank of meandering rivers 40, and arc artificial swamp is arc-shaped, and radian and bend The curvature in river is consistent.So as to using the favorable terrain of meandering rivers, without applying external force, be carried from river Water helps river to reduce river water level and flood peak clipping flow in flood season.
Meandering rivers have ordinary water level 41 and the design flood level 42 above ordinary water level.Design flood level, just Ordinary water level should specifically determine, but constant with the relationship of artificial swamp crest level according to topographic features, hydrologic regime, i.e. design flood Position is less than artificial swamp crest level 0.5m-0.8m higher than artificial swamp crest level 0.5m-1.0m, ordinary water level.
Arc artificial swamp includes metalling 15, coarse sands layer 14, fine sand layer 13, soil horizon 12 and plantation successively from bottom to up Plant 11 on upper soil horizon.Wherein, the overhead height of fine sand layer mutually maintains an equal level with ordinary water level, and fine sand layer is away from meandering rivers Top side is provided with wetland upper port 131, and the side of metalling towards meandering rivers is provided with wetland lower port 151, wetland Fine-structure mesh grid is preferably provided at lower port.
The specific preferred arrangement of arc artificial swamp is:
Soil layer thickness is preferably 30cm-50cm, and medium preferably presses 3 by loam, fine sand, river silt, carbon source, haydite:3:1:1:1 Proportional arrangement form.
Plant is preferably the xylophyta or herbaceous plant of energy absorbed nitrogen phosphorus, wherein, the planting density of xylophyta is 1 Strain/m2, herbal planting density is 5-6 plants/m2.Further, plant is preferably shrub type willow, Lythrum salicaria or nutgrass flatsedge etc. In one kind or combination.
Fine sand layer thickness is preferably 60cm, medium preferably by grain size be 0.2mm-0.3mm fine sand, grain size 2mm- The thin silica and grain size of 5mm is the thin haydite compositions of 2mm-5mm, and each component ratio is 5:1:1, the infiltration coefficient of fine sand layer exists Between 8m/d-15m/d.
Coarse sands layer is preferably made of the pure sand of 1mm-2mm, and thickness is preferably 100cm.
Metalling is preferably made of rubble of the particle diameter in 10mm-30mm, and thickness is preferably 30cm.
One end of wetland lower channel is connected with meandering rivers, one end that wetland lower channel is connected with meandering rivers It is preferably provided with trash rack for water inlet 21.Trash rack for water inlet can intercept the impurity in urban river water for the first time, fine-structure mesh grid It can carry out secondary interception.
The other end of wetland lower channel is connected with wetland lower port, and preceding work is provided in the middle part of wetland lower channel Gate 22, preceding main gate are normally opened gate.
One end of wetland upper end pipeline is connected with wetland upper port, and the other end of wetland upper end pipeline is provided with two pieces points Breeches pipe, wherein a furcation area pipe is water purification drainpipe 33, another furcation area pipe is sewage water inlet pipe 34, and sewage water inlet pipe passes through dirt Water pump is connected with source of sewage;The crotch of two furcation area pipes is provided with two-way switch 32, the middle part setting of wetland upper end pipeline There is rear main gate 31.
By the switching of two-way switch, it can realize the collection of river water and the processing of sewage in meandering rivers, specifically include Following two workflows.
Workflow 1:River water is collected by artificial swamp filtering
Artificial wet land system will be built at the concave bank of meandering rivers, and the shape of the artificial wet land system is arc-shaped, and and river Road bending direction is consistent, and the wetland preceding pipeline system is set to the inner axis direction of arc artificial swamp, connects artificial swamp With river major trough, according to landform, situation sets the number of its quantity on the spot, and pipe-line system is set to artificial swamp after the wetland Outer axis direction, artificial wet land system is communicated with water purification storage pool and urban sewage pipe, quantity and wetland preceding pipeline System quantity is suitable.
When in flood season, the sewage water inlet pipe after closing wetland in pipe-line system, river water level meets or exceeds design Flood level makes river both sides generate huge pressure difference, while is also acted on by meandering rivers, and river surface layer is limpider River water is continually conveyed as in wetland preceding pipeline system.Since biological filter media and river water level have pressure difference, according to Law of connected vessels, pressure difference will drive river water to pass sequentially through metalling, coarse sands layer and fine sand in biological filter system from top to bottom Layer, filter medium filter out impurity, the polluter in river water.Since artificial swamp top soil layer is more closely knit, with fine sand Layer infiltration coefficient differ 1 to 2 quantity and, most of river water will pass through upper port discharge artificial wet land system, small part river Water then under pressure, continues up and is transmitted through soil horizon and enters artificial swamp surface layer.It will plant what is produced for many years in soil horizon Large-scale wetland xylophyta and herbaceous plant, root system of plant can absorb the polluter being trapped in filtration system, improve The efficiency of the processing river water of filtration system.By the river water of filtering discharge artificial wet land system, water purification drainage pipeline will be passed through It is transported to that city storage area is stored or urban water area is used.
Since preceding main gate is constantly in opening state in system worked well engineering, therefore regardless of whether there are flood Phase can all provide there are table for artificial swamp upper strata plant throughout the year in the filtration system of artificial swamp lower part Moisture reduces man-made irrigation cost, and the loss for avoiding man-made irrigation that water resource is caused to evaporate.
Table one:The experimental data table of the filtered media processes of river water
Pollutant title Enter water concentration(mg/L) Aqueous concentration(mg/L) Removal efficiency(%)
Suspended particulate 221 2.9 99
Phosphate 0.422 0.115 73
Total phosphorus 1.89 0.232 88
Nitrate 6.67 2.98 55
Ammonia radical ion 10.22 3.21 69
Total nitrogen 31.77 8.87 72
Iron 4.6 0.29 94
Copper 0.13 0.009 93
Boron 0.21 0.004 98
Zinc 0.52 0.005 99
The data from chart it can be found that artificial swamp filtration system in river water suspended particulate, metal ion removal efficiency More than 90%, there are the pollutants such as very high standard, nitrogen phosphorus also effectively to remove, it is fine to illustrate that filter medium has river water Treatment effect.
Workflow 2:Sewage is discharged into river by artificial wetland treatment
When after flood season, river water level is fallen after rise, and river inside and outside differential pressure reduces, and closes water purification drainpipe at this time, opens wastewater influent Pipe, before sewage enters sewage conduct, needs to pre-process in sewage, large granular impurity is removed, then pass through wastewater influent Pipe enters artificial swamp filter medium.Due in filter medium there are table, therefore needs pump sewage is provided it is additional Pressure enables sewage to overcome river water level pressure difference, from top to bottom successively by the fine sand layer of artificial wet land system, coarse sands layer with And metalling, it is ultimately discharged into river.
Table two:The experimental data table of the filtered media processes of sewage
Pollutant title Enter water concentration(mg/L) Aqueous concentration(mg/L) Removal efficiency(%)
Suspended particulate 261 6.7 97
Phosphate 0.684 0.202 70
Total phosphorus 2.32 0.392 83
Nitrate 9.78 3.73 62
Ammonia radical ion 14.15 5.32 62
Total nitrogen 40.12 12.76 68
Iron 7.6 0.44 94
Copper 0.21 0.015 93
Boron 0.32 0.009 97
Zinc 0.97 0.043 96
Each pollutant index treatment effect is all fine it can be found that filter medium is to sewage for the data from chart, but every dirty Dye object treatment effect is below river water treatment effect, and main cause is that the concentration of dirty water pollutant is higher, and in sewage disposal There are tables in filter medium in the process, and the pollutant that a part is trapped in filter medium is made to be re-dissolved or moved again It moves in water body, and then enters river.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above Detail, within the scope of the technical concept of the present invention, a variety of equivalents can be carried out to technical scheme of the present invention, this A little equivalents all belong to the scope of protection of the present invention.

Claims (10)

1. a kind of artificial swamp based on Solution of Flow in Curved Channel, it is characterised in that:Including arc artificial swamp, wetland lower channel and wet Ground upper pipes road;
Arc artificial swamp is arranged at the concave bank of meandering rivers, and arc artificial swamp is arc-shaped, and radian and meandering rivers Curvature is consistent;Meandering rivers have ordinary water level and the design flood level above ordinary water level;
Arc artificial swamp is included successively from bottom to up on metalling, coarse sands layer, fine sand layer, soil horizon and the upper soil horizon of plantation Plant;Wherein, the overhead height of fine sand layer mutually maintains an equal level with ordinary water level, and fine sand layer is provided with away from the top side of meandering rivers Wetland upper port, the side of metalling towards meandering rivers are provided with wetland lower port;
One end of wetland lower channel is connected with meandering rivers, and the other end of wetland lower channel is connected with wetland lower port It is logical, preceding main gate is provided in the middle part of wetland lower channel, preceding main gate is normally opened gate;
One end of wetland upper end pipeline is connected with wetland upper port, and the other end of wetland upper end pipeline is provided with two furcation areas Pipe, wherein a furcation area pipe be water purification drainpipe, another furcation area pipe be sewage water inlet pipe, sewage water inlet pipe by sewage pump with Source of sewage is connected;The crotch of two furcation area pipes is provided with two-way switch, works after being provided in the middle part of the pipeline of wetland upper end Gate.
2. the artificial swamp according to claim 1 based on Solution of Flow in Curved Channel, it is characterised in that:Soil layer thickness is 30cm- 50cm, medium press 3 by loam, fine sand, river silt, carbon source, haydite:3:1:1:1 proportional arrangement forms.
3. the artificial swamp according to claim 1 based on Solution of Flow in Curved Channel, it is characterised in that:Plant is energy absorbed nitrogen phosphorus Xylophyta or herbaceous plant, wherein, the planting density of xylophyta is 1 plant/m2, herbal planting density for 5-6 plants/ m2
4. the artificial swamp according to claim 3 based on Solution of Flow in Curved Channel, it is characterised in that:Plant for shrub type willow, One kind or combination in Lythrum salicaria or nutgrass flatsedge.
5. the artificial swamp according to claim 1 based on Solution of Flow in Curved Channel, it is characterised in that:Fine sand layer thickness is 60cm, The thin silica and grain size that fine sand that its medium is 0.2mm-0.3mm by grain size, grain size are 2mm-5mm are the thin haydites of 2mm-5mm Composition, each component ratio are 5:1:1, the infiltration coefficient of fine sand layer is between 8m/d-15m/d.
6. the artificial swamp according to claim 1 based on Solution of Flow in Curved Channel, it is characterised in that:Coarse sands layer is by 1mm-2mm's Pure husky composition, thickness 100cm.
7. the artificial swamp according to claim 1 based on Solution of Flow in Curved Channel, it is characterised in that:Metalling is existed by particle diameter The rubble composition of 10mm-30mm, thickness 30cm.
8. the artificial swamp according to claim 1 based on Solution of Flow in Curved Channel, it is characterised in that:Wetland lower channel and bend One end that river is connected is provided with trash rack for water inlet.
9. the artificial swamp according to claim 1 based on Solution of Flow in Curved Channel, it is characterised in that:It is provided at wetland lower port Fine-structure mesh grid.
10. the artificial swamp according to claim 1 based on Solution of Flow in Curved Channel, it is characterised in that:Pass through cutting for two-way switch It changes, can realize the collection of river water and the processing of sewage in meandering rivers, specially:When in flood season, wastewater influent is closed Pipe, when river water level meets or exceeds design flood level, the effect of the pressure difference and meandering rivers of the generation of river both sides, by river The limpid river water in road surface layer, which is continually delivered in arc artificial swamp, to be filtered, and most of river water after filtering will pass through Water inlet drainpipe is collected preservation, and small part river water then under pressure, continues up and reaches soil horizon and root system of plant, Meanwhile root system of plant can also absorb the polluter being trapped in arc artificial swamp;When after flood season, river water level is fallen after rise, River inside and outside differential pressure reduces, at this point, closing water purification drainpipe, opens sewage water inlet pipe, the sewage by pretreatment is through sewage pump Processing is filtered into arc artificial swamp, is ultimately discharged into river.
CN201810095779.8A 2018-01-31 2018-01-31 Artificial wetland based on curve water flow Active CN108249579B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050082222A1 (en) * 2003-10-20 2005-04-21 Dharma Living Systems, Lc Tidal vertical flow wastewater treatment system and method
CN1800055A (en) * 2005-12-15 2006-07-12 徐祖信 Modified artificial swamp sewage treatment method
CN102351376A (en) * 2011-07-08 2012-02-15 中国科学院水生生物研究所 Riverbank multiple pond wetland waste sewage treatment method and device
CN103708671A (en) * 2012-09-28 2014-04-09 中国科学院烟台海岸带研究所 Multi-medium constructed wetland water treatment system and treatment method thereof
CN105625255A (en) * 2015-12-25 2016-06-01 中国环境科学研究院 Method for recovering vegetation diversity of river channel and multi-layer natural material river bed
US20170113956A1 (en) * 2015-10-21 2017-04-27 Ton Duc Thang University Wetland roof technology for treating domestic wastewater

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050082222A1 (en) * 2003-10-20 2005-04-21 Dharma Living Systems, Lc Tidal vertical flow wastewater treatment system and method
CN1800055A (en) * 2005-12-15 2006-07-12 徐祖信 Modified artificial swamp sewage treatment method
CN102351376A (en) * 2011-07-08 2012-02-15 中国科学院水生生物研究所 Riverbank multiple pond wetland waste sewage treatment method and device
CN103708671A (en) * 2012-09-28 2014-04-09 中国科学院烟台海岸带研究所 Multi-medium constructed wetland water treatment system and treatment method thereof
US20170113956A1 (en) * 2015-10-21 2017-04-27 Ton Duc Thang University Wetland roof technology for treating domestic wastewater
CN105625255A (en) * 2015-12-25 2016-06-01 中国环境科学研究院 Method for recovering vegetation diversity of river channel and multi-layer natural material river bed

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