A river ecological bank protection and construction method thereof

Abstract

The present invention relates to the field of environmental protection technology, and discloses a river ecological bank protection and a construction method thereof, comprising a disposal area, a drainage component and a transition area; the disposal area comprises a first slope, a groove and a first retaining wall arranged in sequence along the river slope; a first accommodating area is formed between the first slope, the groove and the first retaining wall, and the bottom of the first accommodating area is sequentially paved with a first anti-seepage layer, a first adsorption and filtration layer, a first permeable layer and an anti-slip layer from bottom to top; one end of the drainage component is located in the first adsorption and filtration layer, and the other end of the drainage component is located in the first accommodating area, and the side of the first retaining wall close to the first accommodating area is sequentially paved with a second adsorption and filtration layer and a second permeable layer, and the first accommodating area is filled with a bottom mud layer. The beneficial effect is that the dredged bottom mud is used as a river bank slope protection material after on-site disposal, and is also used as a growth base for plants and microorganisms, so as to realize the resource utilization of the dredged bottom mud.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection, and in particular to a river ecological bank protection and a construction method thereof. Background Art

[0002] With the continuous development of industry, a large amount of industrial wastewater is discharged secretly, leaked and discharged in violation of standards, as well as domestic sewage is discharged directly, causing the river water to become seriously black and smelly, seriously affecting the utilization of water resources and human health.

[0003] The sediments of rivers and lakes contain a large amount of clay, organic matter, nutrients and non-degradable substances. These pollutants deposited in the sediments release pollutants into the water under the complex effects of physics, chemistry and biology, thus destroying the aquatic ecosystem. The removal of polluted sediments from rivers and lakes is currently mainly done by mechanical excavation, then transporting them to temporary storage yards for further dehydration and drying, adding chemicals for treatment, or landfilling, or recycling. However, the transportation process of dredged sediments is costly and prone to secondary pollution. At the same time, due to the large amount of sediment dredging, difficulty in drying, difficulty in handling and disposal, large land area and long time consumption, land resources are wasted. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the above existing technologies and provide a river channel ecological bank protection with a reasonable structure and effective use of river channel dredged sediment. Another purpose of the present invention is to provide a river channel ecological bank protection construction method that uses dredged sediment as river bank slope protection material after on-site disposal and as a growth base for plants and microorganisms, while eliminating its own pollutants, constructs ecological slope protection to intercept runoff pollutants, and realizes resource utilization of dredged sediment.

[0005] The objective of the present invention is achieved through the following technical solutions: a river ecological revetment, comprising a disposal area, a drainage component and a transition area; the disposal area comprises a first slope, a groove and a first retaining wall arranged in sequence along the river slope; a first accommodating area is formed between the first slope, the groove and the first retaining wall, and a first anti-seepage layer, a first adsorption and filtration layer, a first permeable layer and an anti-slip layer are laid in sequence on the bottom of the first accommodating area from bottom to top; one end of the drainage component is located in the first adsorption and filtration layer, and the other end of the drainage component is located in the first accommodating area, a second adsorption and filtration layer and a second permeable layer are laid in sequence on the side of the first retaining wall close to the first accommodating area, the first accommodating area is filled with a bottom mud layer, a first vegetation layer is planted on the bottom mud layer, and the transition zone is located on the side of the first retaining wall away from the first accommodating area.

[0006] Furthermore, the transition zone includes a second slope, a second impermeable layer and a second retaining wall; the second slope is located on the side of the first retaining wall away from the first accommodating area, the second impermeable layer is laid on the surface of the second slope, the second retaining wall is installed at the bottom end of the second slope, and a second accommodating area is formed between the first retaining wall, the second slope and the second retaining wall, the second accommodating area is filled with a third adsorption and filtration layer, and a second vegetation layer is planted on the third adsorption and filtration layer.

[0007] Furthermore, the particle size of the third adsorption filter layer in the second containing area decreases from top to bottom.

[0008] Furthermore, the drainage assembly includes a first drain pipe and a second drain pipe, the first drain pipe has a plurality of evenly distributed water-permeable holes, the first drain pipe is evenly distributed in the first adsorption filter layer along the length direction of the river channel, the second drain pipe is located in the first accommodating area and vertically connected to the first drain pipe, and the second drain pipe is evenly distributed along the length direction of the first drain pipe.

[0009] Furthermore, the opening end of the second drainage pipe is 0.5-1 cm higher than the bottom mud layer, and the top end of the second drainage pipe is provided with a filter cover.

[0010] Furthermore, the cross section of the groove is a right-angled trapezoid, the hypotenuse surface of the groove is connected to the first slope, and the depth of the groove is 30-50 cm.

[0011] Furthermore, the slope of the first slope is 15°-50°.

[0012] Furthermore, the slope of the second slope is 15°-50°.

[0013] Furthermore, the disposal area also includes a drainage ditch, which is located at the top of the first slope, and the drainage ditch is paved with a filter layer, and the drainage ditch is connected to the first adsorption filter layer.

[0014] Furthermore, the first adsorption and filtration layer is an ecological gabion filled with filter material, and the top of the first adsorption and filtration layer is located at the bottom of the drainage ditch and is fixed by fixing piles.

[0015] A construction method for river ecological bank protection:

[0016] S101, mechanically cutting the river slope, digging a drainage ditch at the top of the first slope, digging a groove at the bottom of the first slope, compacting the first slope, the groove and the second slope with a tamping machine, installing a first retaining wall at the top of the second slope, and installing a second retaining wall at the bottom of the second slope;

[0017] S102, laying a first impermeable layer, a first adsorption and filtration layer, a first water-permeable layer and an anti-slip layer in order from bottom to top at the bottom of the first slope and the groove, the top of the first adsorption and filtration layer is set at the bottom of the drainage ditch and fixed by fixing piles, laying a second adsorption and filtration layer and a second water-permeable layer in order on the side of the first retaining wall close to the groove, laying a first drainage pipe in the first adsorption and filtration layer along the length direction of the river channel, and installing a second drainage pipe vertically connected to the first drainage pipe;

[0018] S103, filling the first slope and the groove with bottom mud in layers, each layer has a thickness of 5-20 cm, and the time interval is 2-7 days. The first slope is filled with bottom mud to a height of 15-30 cm, and the groove is filled with bottom mud to a height of 50-80 cm;

[0019] S104, laying a second anti-seepage layer and a third adsorption and filtration layer in sequence from bottom to top at the bottom of the second slope;

[0020] S105, laying a filter layer in communication with the first adsorption filter layer in the drainage ditch;

[0021] S106. Planting vegetation on the bottom mud layer and the third adsorption and filtration layer.

[0022] The present invention has the following advantages over the prior art:

[0023] 1. The ecological revetment of this river channel builds a natural dewatering site for bottom mud along the river slope, and directly disposes the dredged bottom mud on site without the need for external chemical treatment, reducing transportation and transfer costs and land occupation. The ecological revetment of this river channel repairs and excavates grooves to increase the amount of bottom mud to be disposed on site. The first retaining wall can better support the dredged silt in the disposal area to avoid landslides. The transition zone and the second retaining wall are set up to reduce the impact of water flow on the slope, increase the soil and water conservation capacity and stability of the slope. Plant vegetation in the upper layer of the disposal area and the transition zone to build an ecological slope combined with microbial degradation and plant adsorption, intercept runoff pollutants, and reduce secondary pollution.

[0024] 2. The first and second drainage pipes laid out in the ecological revetment of this river can not only speed up the drainage and prevent the collapse of the bottom mud layer, but also serve as gas exchange tubes to promote the reproduction of aerobic microorganisms; the existence of the first adsorption filter layer and the second adsorption filter layer not only provides adsorption, but also provides a living space for microorganisms, promoting the ability of microorganisms to degrade pollutants.

[0025] 3. The ecological revetment of this river channel is equipped with a drainage ditch at the top of the first slope, which can allow the surface runoff to pass through the filtering and adsorption layer at the bottom of the treatment area, the upper vegetation of the treatment area, and then to the transition area for interception, thereby realizing the staged and multi-level interception of the surface runoff.

[0026] 4. The ecological bank protection of this river channel will use the dredged sludge for river bank slope protection materials after on-site disposal, and at the same time serve as a growth base for plants and microorganisms. While eliminating its own pollutants, it will build ecological slope protection to intercept runoff pollutants and realize the resource utilization of dredged sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0028] Figure 1 It shows a schematic structural diagram of the river ecological bank protection according to the present invention;

[0029] Figure 2 A schematic diagram of the structure of the drainage assembly of the present invention is shown;

[0030] In the figure, 11 is the disposal area; 111 is the drainage ditch; 112 is the first vegetation layer; 113 is the bottom mud layer; 114 is the anti-skid layer; 115 is the first permeable layer; 116 is the first adsorption and filtration layer; 117 is the first anti-seepage layer; 118 is the first drainage pipe; 1181 is the permeable hole; 119 is the second drainage pipe; 120 is the second permeable layer; 121 is the second adsorption and filtration layer; 122 is the first retaining wall; 123 is the fixed pile; 22 is the transition zone; 221 is the second vegetation layer; 222 is the third adsorption and filtration layer; 223 is the second anti-seepage layer; 224 is the second retaining wall; 3 is the first slope; 4 is the groove; 5 is the second slope. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] like Figure 1A river ecological revetment shown in the figure comprises a disposal area 11, a drainage component and a transition area 22; the disposal area 11 comprises a first slope 3, a groove 4 and a first retaining wall 122 arranged in sequence from top to bottom; a first accommodating area is formed between the first slope 3, the groove 4 and the first retaining wall 122, and the bottom of the first accommodating area is sequentially paved with a first anti-seepage layer 117, a first adsorption and filtration layer 116, a first permeable layer 115 and an anti-slip layer 114 from bottom to top, one end of the drainage component is located in the first adsorption and filtration layer 116, and the other end of the drainage component is located in the first accommodating area, a second adsorption and filtration layer 121 and a second permeable layer 120 are sequentially arranged on the side of the first retaining wall 122 close to the first accommodating area, the first accommodating area is filled with a bottom mud layer 113, and a first vegetation layer 112 is planted on the bottom mud layer 113; the transition area 22 is located on the side of the first retaining wall 122 away from the first accommodating area. The ecological revetment utilizes machinery to trim the river and lake slopes, digs out the first slope 3 and the groove 4, places the bottom mud in them, and constructs an on-site treatment and disposal area for polluted bottom mud, which can reduce the high cost of transportation and the long time of land occupation. At the same time, it combines biodegradation and plant adsorption to further eliminate pollutants in river and lake bottom mud, and constructs an ecological bank slope to intercept runoff pollutants, realizing the resource utilization of bottom mud.

[0033] Wherein: the anti-skid layer 114 can be made of crushed stone, construction waste, etc., with a particle size between 3-8cm and a laying thickness of 5-10cm. The bottom mud layer 113 can be filled in layers for multiple times, with a time interval of 2-7 days between each layer and a thickness of 5-20cm. The bottom mud height at the slope surface of the first slope 3 is between 15-30cm, and the bottom mud height at the groove is between 50-80cm. The cross section of the groove 4 is a right-angle trapezoid, and the hypotenuse of the groove 4 is connected to the first slope 3, and the depth of the groove is 30-50cm. The slope of the hypotenuse of the groove 4 is 30°-75°, and the slope of the hypotenuse of the groove 4 is greater than the slope of the first slope. The amount of on-site disposal of the bottom mud can be increased by setting the groove 4. The first vegetation layer 112 is turf. The second adsorption and filtration layer 121 and the second permeable layer 120 are sequentially arranged on the side of the first retaining wall 122 close to the first accommodating area, which can effectively prevent the pollutants in the bottom mud layer from corroding the first retaining wall 122.

[0034] The transition zone 22 includes a second slope 5, a second impermeable layer 223 and a second retaining wall 224; the second slope 5 is located on the side of the first retaining wall 122 away from the first accommodating area, the second impermeable layer 223 is laid on the surface of the second slope 5, the second retaining wall 224 is installed at the bottom of the first slope 3, and the first retaining wall 122, the second slope 5 and the second retaining wall 224 form a second accommodating area, and the second accommodating area is filled with a third adsorption filter layer 222, and the second vegetation layer 221 is planted on the third adsorption filter layer 222. The width of the transition zone 22 can be adjusted appropriately, generally 50-100cm. The third adsorption filter layer 222 is an ecological gabion filled with fillers. The third adsorption filter layer 222 is a multi-stage filter, and the fillers are filled in layers from top to bottom, and the particle size is from large to small. The upper part can be selected from crushed stone, construction waste, etc., and the particle size is not more than 5cm; the middle and lower parts are ceramsite, volcanic rock, zeolite, activated carbon, quartz sand, etc., and the particle size is not more than 2cm. The second vegetation layer 221 is grass or shrubs.

[0035] The first retaining wall 122 can be made of pine piles, willow piles, concrete piles, etc., and the second retaining wall 224 can be made of cement piles to prevent water erosion and corrosion. At the same time, flood-resistant and easy-to-live trees such as willow and metasequoia can also be selected. The first retaining wall 122 and the second retaining wall 224 are dug 2-3 meters underground. The first anti-seepage layer 117 and the second anti-seepage layer 223 use anti-seepage geomembranes. The first retaining wall 122 and the second retaining wall 224 are both set along the length of the river bank.

[0036] The water permeability of the first water permeable layer 115 is higher than that of the second water permeable layer 120. The second water permeable layer 120 with weaker water permeability can appropriately prolong the sewage retention time, thereby intercepting the sewage and increasing the time for microorganisms in the first adsorption and filtration layers and the second adsorption and filtration layers to treat the sewage. The first and second water permeable layers can be made of water permeable materials such as permeable geotextiles with a gram weight of 100-1000g / m 2 .

[0037] like Figure 1 and Figure 2As shown, the drainage assembly includes a first drainage pipe 118 and a second drainage pipe 119. The first drainage pipe 118 has a plurality of evenly distributed water-permeable holes 1181. The first drainage pipe 118 is evenly distributed in the first adsorption filter layer 116 along the length direction of the river channel. The second drainage pipe 119 is located in the first accommodating area and vertically connected to the first drainage pipe 118. The second drainage pipe 119 is evenly distributed along the length direction of the first drainage pipe 118. The first drainage pipe 118 is distributed at intervals in the first adsorption filter layer 116, and the intervals are 100-200 cm. Specifically, the first drainage pipe 118 arranged horizontally passes through the first adsorption filter layer 116, and the second drainage pipe 119 arranged longitudinally is vertically connected to the first drainage pipe 118. The opening end of the second drainage pipe 119 is about 0.5-1 cm higher than the bottom mud layer. The top of the second drainage pipe has a filter cover, and the filter cover has a plurality of openings. The diameter of the first drain pipe 118 is preferably an ecological gabion that can pass through the first adsorption and filtration layer 116. The aperture of the first drain pipe 118 is 0.5-1 cm, the diameter of the second drain pipe is 5-10 cm, and the interval between the second drain pipes is 100-300 cm. The first drain pipe 118 and the second drain pipe 119 can use waste rainwater pipe materials, etc. By setting the first drain pipe 118 and the second drain pipe 119, gas exchange can be provided for the microorganisms in the first adsorption and filtration layer 116. The sewage in the drainage ditch 111 and the bottom mud layer 113 will not directly penetrate into the soil at the bottom of the disposal area after being intercepted by the first impermeable layer 117. After being adsorbed and degraded by the first vegetation layer 112, the first adsorption and filtration layer 116 and the second adsorption and filtration layer 121 in the disposal area, the sewage slowly seeps out to the transition area through the second permeable layer 120 and the first retaining wall 122. During rainfall, when the drainage volume in the drainage ditch is large, a part of the rainy season surface source sewage can pass through the filter layer, the first adsorption filter layer 116, and the first drainage pipe 118 in the drainage ditch and then enter the second drainage pipe 119, and then seep out to the transition zone through the second permeable layer 120 and the first retaining wall 122; another part of the rainy season surface source sewage can flow into the transition zone 22 through the first vegetation layer 112 of the disposal area 11 and then into the river.

[0038] The first slope 3 has a slope of 15°-50°. The second slope 5 has a slope of 15°-50°. The first slope 3 and the second slope 5 have gentler slopes, which can reduce the pressure on the retaining wall and reduce the incidence of landslides.

[0039] The treatment area 11 also includes a drainage ditch 111, which is located at the top of the first slope 3, and is paved with a filter layer. The drainage ditch 111 is connected to the first adsorption filter layer 116. A drainage ditch 111 is provided between the top of the treatment area 11 and the dam top, and a filter layer is laid at the bottom of the drainage ditch, wherein crushed stone, ceramsite, activated carbon, etc. can be selected in the filter layer, with a particle size of 1.5-3 cm and a thickness of 5-10 cm.

[0040] The first adsorption filter layer 116 is an ecological gabion filled with filter material. The top of the first adsorption filter layer 116 is located at the bottom of the drainage ditch 111 and is fixed by a fixed pile 123. With this arrangement, the stability of the first adsorption filter layer 116 can be improved, and the overall structure of the disposal area 11 can be ensured to be stable. The filter material in the first adsorption filter layer 116 is composed of at least one or more of ceramsite, volcanic rock, zeolite, activated carbon, quartz sand, etc., with a particle size of less than 1.5 cm and a laying thickness of 5-10 cm. The fixed pile 123 can be selected from wooden piles, steel columns, concrete columns, etc., and driven into the ground to a depth of 0.5-1m. The second adsorption filter layer 121 has the same composition as the first adsorption filter layer 116. Microorganisms can be pre-added to both the first adsorption filter layer 116 and the second adsorption filter layer 121.

[0041] A construction method for river ecological bank protection:

[0042] S101. Mechanically cut the river slope, dig a drainage ditch 111 at the top of the first slope 3, dig a groove 4 at the bottom of the first slope 3, compact the first slope 3, groove 4 and second slope 5 with a rammer, install a first retaining wall 122 at the top of the second slope 5, and install a second retaining wall 224 at the bottom of the second slope 5; the slopes of the first slope 3 and the second slope 5 are both 15°-50°. The width of the second slope 5 is 50-100 cm above the normal water level of the river slope, the width of the first slope 3 is preferably the maximum value of the width of the river slope minus the width of the second slope 5, the depth of the groove 4 is 30-50 cm, and the width of the groove 4 is the same as the width of the first slope 3. The first slope 3, groove 4 and second slope 5 are between the first accommodating area, and the second retaining wall 122, second slope 5 and second retaining wall 224 are between the second accommodating area.

[0043] S102, the first impermeable layer 117, the first adsorption filter layer 116, the first water-permeable layer 115 and the anti-slip layer 114 are laid in sequence from bottom to top at the bottom of the first slope 3 and the groove 4. The top of the first adsorption filter layer 116 is set at the bottom of the drainage ditch 111 and fixed by a fixing pile 123. The second adsorption filter layer 121 and the second water-permeable layer 120 are laid in sequence on the side of the first retaining wall 122 close to the groove 4. The first drainage pipe 118 is laid in the first adsorption filter layer 116 along the length of the river channel. The second drainage pipe 119 perpendicular to the first drainage pipe 118 is installed in the first accommodation area. The first adsorption filter layer 116 and the second adsorption filter layer 121 are both ecological gabions filled with filter materials. The top of the first adsorption filter layer 116 is located in the drainage ditch 111 and fixed by a fixing pile 123 to prevent sliding. The diameter of the first drainage pipe 118 is preferably selected to just pass through the ecological gabion, and is laid at intervals of 1-2m. At the same time, the layout of the second drain pipe 119 can be appropriately increased according to the width of the disposal area 11. The first drain pipe 118 and the second drain pipe 119 are interconnected and can be used as drainage channels and bottom gas exchange channels to accelerate drainage and microbial reproduction.

[0044] S103, fill the first slope 3 and the groove 4 with sludge in layers, each layer is 5-20cm thick, the time interval is 2-7 days, the first slope 3 is filled with sludge to a height of 15-30cm, and the groove 4 is filled with sludge to a height of 50-80cm; the method of excavating the groove 4 and filling in layers can increase the dredged sludge processing capacity and prevent the upper sludge from sliding, and the final filled sludge layer has a slope of less than 50° and is lower than the height of the first retaining wall 122. The upper surface of the sludge layer is 5-10cm higher than the upper surface of the third adsorption and filtration layer 222. This setting can increase the sludge processing capacity and reduce the amount of filler in the transition zone. Moreover, when it rains, the runoff rainwater will fall when it flows into the transition zone through the first vegetation layer in the disposal area, slowing down the flow rate of rainwater.

[0045] S104, the second anti-seepage layer 223 and the third adsorption and filtration layer 222 are laid from bottom to top at the bottom of the second slope 5; fillers of different particle sizes are evenly laid from top to bottom in the third adsorption and filtration layer 222, the upper part can be made of crushed stone, construction waste, etc., with a particle size of 3-5 cm; the middle and lower parts are ceramsite, volcanic rock, zeolite, quartz sand, etc., with a particle size of 0.5-2 cm, all fixed with ecological gabions. The ecological gabions can be tied to the first retaining wall 122 between the disposal area 11 and the transition area 22.

[0046] S105, a filter layer connected to the first adsorption filter layer 116 is laid in the drainage ditch 111; the bottom of the drainage ditch 111 is built with concrete, leaving multiple drainage ports connected to the first adsorption filter layer 116 of the disposal area 11, and a 5-10 cm filter layer is laid at the same time. The fixed pile 123 passes through the filter layer, the drainage port and the first adsorption filter layer 116 in sequence and then is nailed into the soil.

[0047] S106, planting vegetation on the bottom mud layer 113 and the third adsorption and filtration layer 222. The first vegetation layer 112, such as turf, is planted on the bottom mud layer 113, and the second vegetation layer 221, such as turf, shrubs, etc., is planted on the third adsorption and filtration layer 222.

[0048] The method is used to construct a physical interception-microbial decomposition-vegetation absorption system in the disposal area and the transition area, which can effectively reduce sewage pollution entering the river.

[0049] After the dredged sludge is disposed on site, the stability of the slope and the lowest position of the disposal area must be fully considered during construction. The moisture content of the dredged sludge is not more than 75%. At the same time, the filter material-microorganism-plant degradation adsorption and removal of pollutants mechanism is fully utilized, and the slope construction and sludge dredging are carried out simultaneously. This method has high operability, good effect in reducing secondary pollution, and significant environmental benefits.

[0050] The above specific implementation modes are preferred embodiments of the present invention and cannot be used to limit the present invention. Any other changes or other equivalent replacement methods that do not deviate from the technical solution of the present invention are included in the protection scope of the present invention.

Claims

1. A river ecological bank protection, Features: It comprises a disposal area, a drainage component and a transition area; the disposal area comprises a first slope, a groove and a first retaining wall arranged in sequence along the river slope; a first accommodating area is formed between the first slope, the groove and the first retaining wall, and a first anti-seepage layer, a first adsorption and filtration layer, a first water-permeable layer and an anti-slip layer are laid in sequence on the bottom of the first accommodating area from bottom to top; one end of the drainage component is located in the first adsorption and filtration layer, and the other end of the drainage component is located in the first accommodating area; a second adsorption and filtration layer and a second water-permeable layer are laid in sequence on the side of the first retaining wall close to the first accommodating area; the first accommodating area is filled with a bottom mud layer, and a first vegetation layer is planted on the bottom mud layer; the transition area is located on the side of the first retaining wall away from the first accommodating area; The transition zone includes a second slope, a second impermeable layer and a second retaining wall; the second slope is located on a side of the first retaining wall away from the first accommodating area, the second impermeable layer is laid on the surface of the second slope, the second retaining wall is installed at the bottom of the second slope, a second accommodating area is formed between the first retaining wall, the second slope and the second retaining wall, the second accommodating area is filled with a third adsorption and filtration layer, and a second vegetation layer is planted on the third adsorption and filtration layer; The drainage assembly comprises a first drainage pipe and a second drainage pipe, wherein the first drainage pipe is provided with a plurality of evenly distributed water permeable holes, and the first drainage pipe is evenly distributed in the first adsorption and filtration layer along the length direction of the river channel, and the second drainage pipe is located in the first accommodating area and vertically connected to the first drainage pipe, and the second drainage pipe is evenly distributed along the length direction of the first drainage pipe; By setting up the transition zone and the second retaining wall, the impact of water flow on the bank slope is reduced, and the water and soil conservation capacity and stability of the bank slope are increased; During rainfall, when the drainage volume in the drainage ditch is large, a part of the rainy season surface source sewage can pass through the filter layer, the first adsorption filter layer, and the first drainage pipe in the drainage ditch into the second drainage pipe, and then seep out to the transition zone through the second permeable layer and the first retaining wall; another part of the rainy season surface source sewage can flow into the transition zone through the first vegetation layer of the disposal area and then into the river.

2. The river ecological bank protection according to claim 1, Features: The opening end of the second drainage pipe is 0.5-1 cm higher than the bottom mud layer, and the top end of the second drainage pipe is provided with a filter cover.

3. The river ecological bank protection according to claim 1, Features: The cross section of the groove is a right-angle trapezoid, the hypotenuse surface of the groove is connected to the first slope, and the depth of the groove is 30-50 cm.

4. The river ecological bank protection according to claim 1, Features: The first slope has a gradient of 15°-50°.

5. The river ecological bank protection according to claim 1, Features: The slope of the second slope is 15°-50°.

6. The river ecological bank protection according to claim 1, Features: The disposal area also includes a drainage ditch, which is located at the top of the first slope. The drainage ditch is paved with a filter layer, and the drainage ditch is connected to the first adsorption filter layer.

7. The river ecological bank protection according to claim 6, Features: The first adsorption and filtration layer is an ecological stone cage filled with filter material. The top of the first adsorption and filtration layer is located at the bottom of the drainage ditch and is fixed by fixing piles.

8. A construction method for river ecological bank protection according to any one of claims 1 to 7, It is characterized in that The steps include: S101, mechanically cutting the river slope, digging a drainage ditch at the top of the first slope, digging a groove at the bottom of the first slope, compacting the first slope, the groove and the second slope with a tamping machine, installing a first retaining wall at the top of the second slope, and installing a second retaining wall at the bottom of the second slope; S102, laying a first anti-seepage layer, a first adsorption and filtration layer, a first water-permeable layer and an anti-slip layer in order from bottom to top at the bottom of the first slope and the groove, the top of the first adsorption and filtration layer is set at the bottom of the drainage ditch and fixed by fixing piles, laying a second adsorption and filtration layer and a second water-permeable layer in order on one side of the first retaining wall close to the groove, laying a first drainage pipe in the first adsorption and filtration layer along the length direction of the river bank, and installing a second drainage pipe vertically connected to the first drainage pipe; S103, filling the first slope and the groove with bottom mud in layers, each layer has a thickness of 5-20 cm, and the time interval is 2-7 days. The first slope is filled with bottom mud to a height of 15-30 cm, and the groove is filled with bottom mud to a height of 50-80 cm; S104, laying a second anti-seepage layer and a third adsorption and filtration layer in sequence from bottom to top at the bottom of the second slope; S105, laying a filter layer in communication with the first adsorption filter layer in the drainage ditch; S106. Planting vegetation on the bottom mud layer and the third adsorption and filtration layer.

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