Urban river channel protection structure capable of efficiently purifying water

Abstract

The utility model discloses an urban river channel protection structure capable of efficiently purifying water. The urban river channel protection structure comprises a shallow water fast flow section, a deep water reach and a gabion protection pad laid at the river bottom, the deep water river section is arranged at the middle section position of the shallow water fast flow section; and the shallow water fast flow section is formed by sequentially laying a group of water retention ridges along the water flow direction of the river channel. A shallow water fast flow section and a deep water reach are formed through river channel longitudinal slope transformation, the terrain elevation of the two banks of the river channel can be considered, river channel treatment engineering earthwork digging and filling balance is achieved, and the river channel water depth, the water body flow speed and flood drainage meet the actual requirements; the river bottom gabion protection pad can effectively protect the stability of a riverbed and provide good conditions for growth of filamentous green algae and the like; the water retention ridge can meet the minimum water depth requirement of the river channel; the deepwater reach normally keeps large water depth, and the requirements of water body biological diversity for deep pools and shoals are met.

Description

Technical Field

[0001] The utility model belongs to the field of river management, and in particular relates to an urban river protection structure for efficiently purifying water quality. Background Art

[0002] The constant scouring and silting of the river channel causes the riverbed to be unstable, affecting the normal function of the river channel. Traditional river management generally adopts concrete or mortar block stone hardening of the river channel and continuous river channel dredging. These measures can effectively stabilize the riverbed, but the hardening of the river channel causes damage to the water ecological environment; the cost of river channel dredging is high, and the difficulty of silt disposal is increasing.

[0003] In terms of water environment management, the main measures are source control and pollution reduction, internal source management, and water replenishment, and technical measures such as planting aquatic plants, setting up ecological floating beds, and aeration and oxygenation are taken in the river. These technical measures taken in the river have a certain water purification effect, but the water purification capacity is not strong and the maintenance cost is high.

[0004] In terms of sewage treatment, there are biological fluidized bed technology, biofilm enhanced surface flow wetland technology, etc., but these technologies are used to treat high-concentration sewage rather than purify low-concentration river water. They require large construction investment, high treatment costs, and large facility footprint. Summary of the invention

[0005] Purpose of the utility model: The technical problem to be solved by the utility model is to provide an urban river protection structure that can efficiently purify water quality in order to improve the self-purification capacity of urban rivers and improve the water ecological environment in response to the deficiencies in the existing technology.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] An urban river protection structure for efficiently purifying water quality comprises a shallow water fast flow section, a deep water river section and a gabion stone cage mat laid on the river bottom, which are arranged in sequence from top to bottom along the river; the deep water river section is arranged in the middle of the shallow water fast flow section; the shallow water fast flow section is formed by a group of water retaining ridges laid in sequence along the direction of water flow in the river.

[0008] By transforming the longitudinal slope of the river to form shallow and fast-flowing sections and deep water sections, the terrain elevation on both sides of the river can be taken into account, and the balance of earthwork excavation and filling in the river management project can be achieved. The river depth, water flow rate, flood discharge and drainage meet actual needs; the gabion stone cage mats at the bottom of the river can effectively protect the stability of the riverbed and provide good conditions for the growth of filamentous green algae; the water retention bank can meet the minimum water depth requirement of the river; the deep water river section normally maintains a large water depth to meet the needs of aquatic biodiversity for deep pools and shallows, and a collection and salvage device is set up in this section of water to salvage the filamentous green algae biofilm remnants and other floating objects that have fallen off; the river water source meets the minimum ecological flow requirements and maintains a normal water flow landscape; after the implementation of the project, the river naturally forms a shallow and fast-flow state and a filamentous green algae community that efficiently purifies the water quality.

[0009] Specifically, the gabion stone cage mat is laid at the bottom of the shallow water fast flow section. The gabion stone cage mat on the riverbed must meet the functional requirements of flood control and scouring prevention and stabilize the riverbed as a whole; the stone cage and filler have a large specific surface area, which is convenient for the growth of filamentous green algae; the filler is made from local materials as much as possible, and the particle size of the upper layer is larger than the hole size of the stone cage mesh. Effectively maintaining the stability of the riverbed is conducive to the formation of high-quality filamentous green algae biofilm, enhancing water purification capacity, and reducing construction costs.

[0010] Furthermore, the deep-water river section is located in the middle of the lower half of the shallow-water fast-flow section, the riverbed of the deep-water river section is 0.8-1.2 m below the gabion stone cage cushion plane, the length is 40-60 m, and the minimum ecological flow is 1500-2000 m 3 / h.

[0011] The water source of a river is generally naturally collected rainfall runoff. When natural conditions do not meet the demand, it is necessary to rely on measures such as setting up pumping stations to provide water. The water intake point can be an adjacent river channel to the river being managed, or it can be a deep water section of the upper river channel being managed. When the total drop in the terrain of the entire river channel cannot meet the minimum slope ratio requirement, it is necessary to configure an intermediate lifting pump station to continuously maintain the shallow water and fast flow state to meet the minimum ecological flow requirement.

[0012] Furthermore, the top of the water-retaining sill is 15-25 cm higher than the plane of the gabion stone cage cushion, the distance between two adjacent water-retaining sills is 25-35 m, the water depth behind the sill is greater than 10 cm, and the water depth in front of the sill is greater than 20 cm.

[0013] Furthermore, the longitudinal slope ratio of the river channel is 2 / 1000~4 / 1000, and the flow rate is 1500~2500 m 3 / h, flow rate is 15~25cm / s.

[0014] Furthermore, a salvaging device for salvaging floating objects is provided in the deep-water river section, which can meet the needs of water biodiversity for deep pools and shallows; can provide water sources for lower river sections; can timely salvage the filamentous green algae biofilm residues and other floating objects that have fallen off, and realize the material cycle process from filamentous green algae community purifying water to pollutants being removed from water.

[0015] Furthermore, the water-retaining sill comprises a plain concrete sill body at the bottom and concrete embedded pebbles at the top; the plain concrete sill body passes downward through the gabion stone cage cushion and then penetrates into the riverbed plain soil layer at the bottom of the riverbed.

[0016] Furthermore, geotextile, crushed stone cushion layer and gabion stone cage cushion are laid on the riverbed soil layer in sequence from bottom to top.

[0017] Furthermore, the plain concrete bank body is provided with a through drainage hole at the bottom of the gabion stone cage cushion, which can drain the river water when necessary, and the bank body needs to meet the seepage length requirements. It can cooperate with the longitudinal slope transformation to meet the required river water depth and water flow rate requirements, and realize the shallow water fast flow state. When necessary, drain the river water, clean up garbage and debris, repair the stone cage, and expose to degrade sediment pollution.

[0018] Furthermore, the gabion stone cage cushion comprises a permeable geotextile, a sand and gravel cushion layer, a gabion stone cage and a filler filled in the gabion stone cage; the gabion stone cage is loaded with filamentous green algae. On the one hand, it presents a smart water landscape, and on the other hand, it meets the requirements of the filamentous green algae for flow state, photosynthesis, algae attachment and growth, and forms a filamentous green algae biofilm. The water flow is greater than the non-silting flow rate, and the shallow water fast flow section of the river is no longer silted.

[0019] Preferably, the naturally formed filamentous green algae community is mainly composed of spirogyra and ulothrix, which grow naturally and fall off naturally. The adsorption, absorption, interception and degradation functions of the filamentous green algae can be fully utilized, and the characteristics of the filamentous green algae that it is easy to separate algae from water and easy to salvage can be used to remove the filamentous green algae biofilm residues that have fallen off from the water body. Beneficial Effects

[0020] (1) The city's river protection structure combines the requirements of stabilizing the riverbed with the construction of new riverbed interfaces such as gabions and fillers, forming a shallow and fast-flowing river flow pattern, creating environmental conditions conducive to the growth of filamentous green algae, and naturally forming a filamentous green algae community. The vast waters of the river itself are used as a water purification space, giving full play to the powerful water purification function of filamentous green algae.

[0021] (2) The gabion cushion in the city’s river protection structure is a flexible protection structure. While protecting the stability of the riverbed, it retains the channel for material energy exchange at the mud-water interface, greatly increasing the surface area of ​​contact between the river water and the riverbed, and creating good conditions for the attachment of filamentous green algae.

[0022] (3) The urban river protection structure has formed a shallow and fast-flowing river water pattern through technical measures such as river channel longitudinal slope transformation and water-retaining embankments. First, it meets the requirements of filamentous green algae for flow pattern, photosynthesis, and algae attachment and growth, forming a filamentous green algae community; second, it presents a dynamic water landscape; third, it reduces the supply of water resources; fourth, the outlet along the river is completely exposed above the water surface, making it easier to investigate and deal with pollution entering the river; fifth, the water flow rate in the shallow and fast-flowing section is greater than the non-silting flow rate, greatly reducing the workload of dredging.

[0023] (4) The urban river protection structure can meet the needs of water biodiversity for deep pools and shallows through technical measures such as deep water river sections and river water sources; timely salvage the filamentous green algae biofilm remnants and other floating objects that have fallen off, realizing the material cycle from filamentous green algae communities purifying water quality to removing pollutants from the water body; and can continuously meet the minimum ecological flow requirements.

[0024] (5) The urban river protection structure uses naturally formed filamentous green algae communities, mainly Spirogyra and filamentous algae, which grow naturally and fall off naturally. It fully exerts the adsorption, absorption, interception and degradation functions of filamentous green algae, and takes advantage of the characteristics of filamentous green algae that are easy to separate from algae and water for easy salvage, so as to remove the filamentous green algae biofilm residues after falling off from the water body. It has good river protection function and powerful water purification function, with small investment, easy maintenance, quick effect and good effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods, and the above and / or other advantages of the present invention will become more clear.

[0026] Figure 1 It is a schematic diagram of the longitudinal section of the riverbed in the embodiment of the present application.

[0027] Figure 2 It is a cross-sectional schematic diagram of the gabion stone cage cushion and water retaining sill in the embodiment of the present application.

[0028] Figure 3 It is a schematic diagram of the surface layer of the gabion stone cage cushion in the embodiment of the present application.

[0029] Explanation of the reference numerals: 1. Shallow water and fast flow section; 2. Deep water river section; 3. Gabion stone cage cushion; 4. Water-retaining bank; 5. Water surface line; 6. Concrete embedded with pebbles; 7. Plain concrete bank body; 8. Gravel cushion layer; 9. Geotextile; 10. Riverbed soil; 11. Gabion stone cage; 12. Filler; 13. Filamentous green algae. DETAILED DESCRIPTION

[0030] The present invention can be better understood according to the following embodiments.

[0031] The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "front", "back", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0032] Combination Figure 1 As shown, the utility model of the urban river protection structure for efficiently purifying water quality comprises a shallow water fast flow section 1, a deep water river section 2 and a gabion stone cage mat 3 laid on the river bottom, which are arranged in sequence from top to bottom along the river; the deep water river section 2 is arranged in the middle of the shallow water fast flow section 1; the shallow water fast flow section 1 is formed by a group of water retaining dams 4 laid in sequence along the direction of water flow in the river.

[0033] By transforming the longitudinal slope of the river channel to form a shallow fast-flow section 1 and a deep water section 2, the terrain elevation on both sides of the river channel can be taken into account, and the excavation and filling balance of the river channel regulation project can be achieved. The river channel water depth, water flow rate, flood discharge and drainage meet the actual needs; the river bottom gabion stone cage mat 3 can effectively protect the stability of the riverbed and provide good conditions for the growth of filamentous green algae; the water retention bank 4 can meet the minimum water depth requirement of the river channel; the deep water section 2 normally maintains a large water depth to meet the needs of water biodiversity for deep pools and shallows, and a collection and salvage device is set up in this section of water to salvage the filamentous green algae biofilm remnants and other floating objects that have fallen off; the river water source meets the minimum ecological flow requirement and maintains a normal water flow landscape; after the implementation of the project, the river channel naturally forms a shallow fast-flow state and a filamentous green algae community that efficiently purifies water quality.

[0034] The river channel longitudinal slope modification includes riverbed elevation and longitudinal slope ratio. According to the excavation and filling balance requirements of the river channel regulation project, the riverbed elevation is calculated, which reduces the project investment and construction difficulty; the hydraulic gradient is calculated according to the ecological flow and landscape flow rate, and the longitudinal slope ratio is not less than the hydraulic gradient. In this embodiment, the total drop of the entire river channel terrain can meet the minimum slope ratio requirements, and no intermediate lifting pump station is configured.

[0035] The gabion stone cage mat 3 is laid at the bottom of the shallow water fast flow section 1. The riverbed gabion stone cage mat 3 as a whole needs to meet the functional requirements of stabilizing the riverbed such as flood control and scouring prevention; the stone cage and filler have a large specific surface area, which is convenient for the growth of filamentous green algae; the filler is made from local materials as much as possible, and the particle size of the upper layer is larger than the hole size of the stone cage mesh. It effectively maintains the stability of the riverbed, is conducive to the formation of high-quality filamentous green algae biofilm, strengthens water purification capacity, and reduces construction costs.

[0036] In this embodiment, the deep water section 2 is located in the middle of the lower half of the shallow water fast flow section 1. The riverbed of the deep water section 2 is 1 m lower than the plane of the gabion stone cage cushion 3, the length is 50 m, and the minimum ecological flow is 1800 m. 3 / h.

[0037] The water source of a river is generally naturally collected rainfall runoff. When natural conditions do not meet the demand, it is necessary to rely on measures such as setting up pumping stations to provide water. The water intake point can be an adjacent river channel to the river being managed, or it can be a deep water section of the upper river channel being managed. When the total drop in the terrain of the entire river channel cannot meet the minimum slope ratio requirement, it is necessary to configure an intermediate lifting pump station to continuously maintain the shallow water and fast flow state to meet the minimum ecological flow requirement.

[0038] In this embodiment, the top of the water retaining sill 4 is 20 cm higher than the plane of the gabion stone cage cushion 3, the distance between two adjacent water retaining sills 4 is 30 m, the water depth behind the sill is greater than 10 cm, and the water depth before the sill is greater than 20 cm, thereby forming a shallow water fast flow section 1 with a water surface line 5 gradually descending.

[0039] In this example, the longitudinal slope ratio of the river channel is 3 / 1000 and the flow rate is 1800 m 3 / h, flow rate is 20cm / s.

[0040] In some embodiments, a salvaging device for salvaging floating objects is provided in the deep-water river section 2. It can meet the needs of water biodiversity for deep pools and shallows; it can provide water sources for lower river sections; it can timely salvage the filamentous green algae biofilm residues and other floating objects that have fallen off, and realize the material cycle process from filamentous green algae community purifying water to removing pollutants from water.

[0041] Combination Figure 2 As shown, the water retaining embankment 4 includes a plain concrete embankment body 7 at the bottom and concrete embedded pebbles 6 at the top; the plain concrete embankment body 7 passes downward through the gabion stone cage cushion 3 and then penetrates 30 cm into the riverbed plain soil layer 10 at the bottom of the riverbed.

[0042] In this embodiment, the riverbed soil layer 10 is sequentially laid with a geotextile 9, a crushed stone cushion layer 8 and a gabion stone cage cushion 3 from bottom to top.

[0043] In this embodiment, the plain concrete bank body 7 is located at the bottom of the gabion stone cage cushion 3 and is provided with a through drainage hole 14, which can drain the river water when necessary, and the bank body needs to meet the seepage length requirements. It can cooperate with the longitudinal slope transformation to meet the required river water depth and water flow rate requirements, and realize the shallow water fast flow state. When necessary, drain the river water, clean up garbage and debris, repair the stone cage, and expose to degrade sediment pollution.

[0044] Combination Figure 3 As shown, the gabion gabion mat 3 includes a permeable geotextile, a sand and gravel cushion layer, a gabion gabion 11, and a filler 12 filled in the gabion gabion 11; the gabion gabion 11 is loaded with filamentous green algae 13. On the one hand, it presents a smart water landscape, and on the other hand, it meets the requirements of filamentous green algae for flow state, photosynthesis, algae attachment and growth, and forms a filamentous green algae biofilm. The water flow is greater than the non-silting flow rate, and the shallow water fast flow section of the river is no longer silted. In this embodiment, the gabion gabion mat 3 as a whole needs to meet the anti-scouring requirements, the thickness of the sand and gravel filling layer is 15cm, and the height of the gabion gabion mesh is 25cm; the aperture of the gabion gabion mesh is 8cm, and the filler particle size in the gabion is 10cm gravel. The gabion mesh and filler on the surface of the gabion gabion mat have a large surface area, providing good conditions for the attachment and growth of filamentous green algae.

[0045] In this embodiment, the naturally formed filamentous green algae community is mainly composed of spirogyra and ulothrix, which grow naturally and fall off naturally. The adsorption, absorption, interception and degradation functions of the filamentous green algae can be fully utilized, and the characteristics of the filamentous green algae that it is easy to separate algae from water and easy to salvage can be used to remove the filamentous green algae biofilm residues that have fallen off from the water body.

[0046] The utility model provides an idea and method for an urban river protection structure with high efficiency in purifying water quality. There are many methods and ways to implement the technical solution. The above is only the preferred implementation of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model. These improvements and modifications should also be regarded as the protection scope of the utility model. All components not specified in this embodiment can be implemented by existing technologies.

Claims

1. An urban river protection structure for efficiently purifying water, characterized in that: The invention comprises a shallow water fast flow section (1), a deep water river section (2) and a gabion stone cage mat (3) laid on the river bottom, which are arranged in sequence from top to bottom along the river channel; the deep water river section (2) is arranged in the middle of the shallow water fast flow section (1); the shallow water fast flow section (1) is formed by a group of water retaining ridges (4) laid in sequence along the water flow direction of the river channel.

2. The urban river protection structure for efficiently purifying water according to claim 1 is characterized in that: The gabion stone cage mat (3) is laid at the bottom of the shallow water fast flow section (1).

3. The urban river protection structure for efficiently purifying water according to claim 2 is characterized in that: The deep water river section (2) is located in the middle of the lower half of the shallow water fast flow section (1). The riverbed of the deep water river section (2) is 0.8 to 1.2 m below the plane of the gabion stone cage cushion (3). The length is 40 to 60 m, and the minimum ecological flow is 1500 to 2000 m. 3 / h.

4. The urban river protection structure for efficiently purifying water according to claim 2 is characterized in that: The top of the water-retaining sill (4) is 15-25 cm higher than the plane of the gabion stone cage cushion (3), the distance between two adjacent water-retaining sills (4) is 25-35 m, the water depth behind the sill is greater than 10 cm, and the water depth in front of the sill is greater than 20 cm.

5. The urban river protection structure for efficiently purifying water according to claim 1 is characterized in that: The longitudinal slope ratio of the river channel is 2 / 1000~4 / 1000, and the flow rate is 1500~2500 m 3 / h, flow rate is 15~25 cm / s.

6. The urban river protection structure for efficiently purifying water according to claim 3 is characterized in that: A salvaging device for salvaging floating objects is provided in the deep water river section (2).

7. The urban river protection structure for efficiently purifying water according to claim 1 is characterized in that: The water-retaining sill (4) comprises a lower plain concrete sill body (7) and an upper concrete pebbles (6); the plain concrete sill body (7) passes downward through the gabion stone cage cushion (3) and then penetrates into the riverbed plain soil layer (10) at the bottom of the riverbed.

8. The urban river protection structure for efficiently purifying water according to claim 7 is characterized in that: The riverbed soil layer (10) is laid with a geotextile (9), a crushed stone cushion layer (8) and a gabion stone cage cushion (3) in sequence from bottom to top.

9. The urban river protection structure for efficiently purifying water according to claim 7 is characterized in that: The plain concrete ridge (7) is provided with a drainage hole (14) penetrating the bottom of the gabion stone cage cushion (3).

10. The urban river protection structure for efficiently purifying water according to claim 1 is characterized in that: The gabion gabion cushion (3) comprises a permeable geotextile, a sand and gravel cushion layer, a gabion gabion (11), and a filler (12) filled in the gabion gabion (11); the gabion gabion (11) is loaded with filamentous green algae (13).

Images