River channel revetment ecological restoration structure applying novel anti-wave stones

Abstract

The utility model discloses a riverway revetment ecological restoration structure applying novel anti-wave stones, which comprises a river bottom, a river bank and a riverway, a river bank concrete layer is poured on one side close to the river bank, an anti-wave water retaining wall connected with the river bank is built above the river bank concrete layer, a river bank planting layer is arranged at the top of the river bank, and the river bank planting layer is connected with the river bank. A section of dismantling section with the height of 0.6-1.2 m is dismantled on the top of the anti-wave water-retaining wall, a top pressing layer is arranged on the top of the dismantled anti-wave water-retaining wall, a landscape retaining wall is built on the river bank close to one side of the anti-wave water-retaining wall, a repairing bed layer is dug downwards on the river bottom close to one side of the anti-wave water-retaining wall, an anti-wave stone layer is laid above the repairing bed layer, and a water-retaining layer is laid above the repairing bed layer. A stone pressing layer, a non-woven fabric layer and a river bottom planting layer are sequentially arranged above the anti-wave stone layer from bottom to top. According to the utility model, the wave resistance of the revetment of the river bank can be obviously improved, the inhabiting breeding environment of small organisms can be improved, and the basic functions of beautifying the revetment and reducing and preventing disasters can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of comprehensive environmental protection management, and particularly relates to a river bank ecological restoration structure applying a novel wave-resistant stone. Background Technique

[0002] The river channel is an important carrier of water resources and an important part of the natural ecosystem. An ecological river channel is a river channel that, while meeting the basic requirements of water conservancy, can create a suitable growth environment for a good biological community. The first connotation of an ecological river channel is the in-stream flowing water ecology, and the river channel ecology is mainly composed of the aquatic biological system in the river. The aquatic biological system in the river consists of decomposers, producers, and consumers, mainly including: aquatic plants, heterotrophic organisms, zooplankton, macroinvertebrates, and fish and other aquatic animals; The second connotation of an ecological river channel is the ecology of the riverbank protection. The riverbank protection is the transitional zone between the river and the land, closely connecting the water-land zone. It is the external boundary condition for the water movement in the ecological river channel and the key area for the stability of the ecological river channel. The riverbank protection zone is mainly composed of slope protection, small animals, aquatic plants, and microorganisms. The research on the river channel ecosystem uses artificial auxiliary means and technologies, and adopts comprehensive measures to restore the soil and water loss caused by urban construction or natural riverbed scouring, so that the damaged ecosystem can gradually recover or develop towards a virtuous cycle direction, and restore the natural ecosystem according to the natural law. The ecology of the riverbank protection is mainly composed of slope protection, small animals, aquatic plants, and microorganisms. The riverbank protection is the transitional zone between the river and the land, closely connecting the water-land zone. It is the external boundary condition for the water movement in the ecological river channel and the key area for the stability of the ecological river channel. The plants in the riverbank protection zone can buffer the water flow, the river flow velocity, and the erosion rate of the land. On the one hand, the roots of aquatic plants can absorb nutrients such as nitrogen and phosphorus, and on the other hand, they can enhance the stability of the riverbank protection. The riverbank protection zone can weaken the toxicity of runoff pollutants entering the river channel water body and reduce the pollution degree through mechanical, chemical, and biological processes such as filtration, penetration, absorption, retention, and sedimentation. The riverbank protection zone can also affect the sediment transportation and deposition in the river channel. At present, the riverbank protection structure is to dig a pouring groove on the river bottom near the riverbank side, and a riverbank concrete layer is poured in the pouring groove. Above the riverbank concrete layer, a wave-resistant water-retaining wall connected to the riverbank is built. Along the width direction of the riverbank, a riverbank planting layer is arranged at the top of the riverbank, and aquatic plants are planted on the riverbank planting layer. This structure of the riverbank protection structure has the following deficiencies in the process of use. The riverbank protection method is single. In the rainy season, the water level rises, and it is easy to flood the slope protection structure, and the slope protection device is prone to collapse. At the same time, in the case of obvious water level changes, strong winds and high waves during the alternation of the dry season and the rainy season of the lake body, it is difficult to realize the breeding channels of migratory organisms under the conditions of modern urban vertical revetments, and the breathing environment of organisms is extremely easy to be damaged. Traditional wave-resistant stones are mainly used on the coast to play the role of shore protection and embankment protection, and are usually set in areas with large waves and no growth of aquatic plants. If the wave-resistant stone structure is introduced into the vertical revetment structure, it will surely be a safe, beautiful and ecological revetment structure. Therefore, it is objectively necessary to develop a new type of wave-resistant stone riverbank protection ecological restoration structure with novel design, which can not only improve the wave-resistant and shore protection ability, but also provide a breeding environment for small organisms. Summary of the Invention

[0003] The purpose of the present utility model is to provide a novel riverbank ecological restoration structure for a new wave-resistant stone that has a novel design, can improve the wave-resistant and bank-protecting ability, and provide a habitat and breeding environment for small organisms.

[0004] The purpose of the present utility model is achieved as follows. It includes a river bottom, a riverbank, and a river channel. A casting groove is dug on the river bottom near the riverbank side. A riverbank concrete layer is cast in the casting groove. A wave-resistant water-retaining wall connected to the riverbank is built above the riverbank concrete layer. A riverbank planting layer is arranged along the width direction of the riverbank at the top of the riverbank. A section with a height of 0.6 - 1.2 m is removed from the top of the wave-resistant water-retaining wall. A pressing top layer is arranged at the top of the wave-resistant water-retaining wall after the removal. The pressing top layer is arranged on the side close to the river channel. A downwardly sunken retaining wall reinforcement groove is dug on the riverbank close to the wave-resistant water-retaining wall side. A landscape retaining wall is built in the retaining wall reinforcement groove. The top height of the landscape retaining wall is the same as the top height of the removed section. A restoration bed layer is dug downward on the river bottom close to the wave-resistant water-retaining wall side. A wave-resistant stone layer is laid above the restoration bed layer. The wave-resistant stone layer is composed of a plurality of four-corner Y-shaped wave-resistant stones stacked together. A pressing stone layer, a non-woven fabric layer, and a river bottom planting layer are sequentially arranged from bottom to top above the wave-resistant stone layer.

[0005] Compared with the traditional revetment structure, the advantages of the present utility model are as follows: First, the original vertical slope protection structure is improved. A section of the original vertical wave-resistant water retaining wall is removed, and then a landscape retaining wall is set on one side of the wave-resistant water retaining wall. The height of the landscape retaining wall is the same as that of the original wave-resistant water retaining wall. Such a structural arrangement can, on the one hand, meet the flood control requirements of the river bank, and on the other hand, increase the area of the river bank slope protection, improve the grade of the river bank slope protection, enhance the ability of the river bank revetment, and achieve the basic functions of physical resistance, disaster reduction, and disaster prevention. Second, the present utility model introduces anti-wave stones into the slope protection structure of the river bank. After deeply dredging the riverbed at the bottom of the river, an anti-wave stone layer, a pressing stone layer and other revetment layers are laid on the riverbed. The anti-wave stones are extruded and installed on the riverbed at the bottom of the river by pressing stones, which can play a role in improving the bearing capacity of the riverbed. Moreover, the four-corner Y-shaped anti-wave stones are used to slope protect the river bank. A pore support structure is formed through the triangular support composed of the four-corner Y-shaped anti-wave stones, which can realize the formation of activity and breeding spaces for reptiles, shellfish, and fish in the pores, reduce the damage of the wind and waves to aquatic animals. At the same time, the four-corner Y-shaped anti-wave stones can eliminate the impact of water waves on the shore to the greatest extent. By adjusting the size of the anti-wave stones under different conditions and using the excellent compressive strength of concrete to bear the upper material load, the anti-wave and slope protection ability of the four-corner Y-shaped anti-wave stones can be significantly improved. In addition, root plants and herbaceous plants are planted on the planting layer at the bottom of the river. The combination of herbaceous plants and root plants is beneficial to the reinforcement of the soil at different depths by the plant roots, playing an active role in soil and water conservation, restoring the river channel ecology, and enhancing the landscape effect. In summary, through the improvement of the original vertical revetment structure, the present utility model adopts a revetment structure combining a landscape retaining wall for shore fixation, a combination of four-corner Y-shaped anti-wave stones, pressing stones, non-woven fabrics and backfilled planting soil, which can not only significantly improve the anti-wave and revetment ability of the river bank, but also provide a breeding environment for small organisms to inhabit. At the same time, it can beautify the revetment, reduce the backfill volume of natural stones or soil bodies, save limited resources, meet the basic functions of disaster reduction and disaster prevention, and greatly improve the ecological and landscape benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0007] Figure 2 is a three-dimensional view of the four-corner Y-shaped anti-wave stone in the present utility model;

[0008] Figure 3 is a front view schematic diagram of the four-corner Y-shaped anti-wave stone in the present utility model;

[0009] Figure 4 is a top view schematic diagram of the four-corner Y-shaped anti-wave stone in the present utility model;

[0010] In the figure: 1 - river bottom, 2 - river bank, 3 - river course, 4 - river bank concrete layer, 5 - wave-resistant water retaining wall, 51 - demolition section, 6 - river bank planting layer, 7 - capping layer, 8 - landscape retaining wall, 9 - repair bed layer, 10 - wave-resistant stone layer, 101 - main rod section, 102 - secondary rod section, 11 - stone pressing layer, 12 - non-woven fabric layer, 13 - river bottom planting layer, 14 - gravel layer, 15 - river bottom concrete layer, 16 - cobblestone layer. Specific implementation manner

[0011] The present invention will be further described below with reference to the accompanying drawings, but it is not limited to the present invention in any way. Any changes or improvements made based on the teachings of the present invention fall within the protection scope of the present invention.

[0012] As Figures 1 to 3 shown, the present invention includes a river bottom 1, a river bank 2 and a river course 3. A pouring groove is dug on the river bottom near one side of the river bank 2. The river bank concrete layer 4 is poured in the pouring groove. The river bank concrete layer 4 is poured with concrete C25 used in the prior art. A wave-resistant water retaining wall 5 connected to the river bank is built above the river bank concrete layer 4. The width of the wave-resistant water retaining wall 5 gradually decreases from bottom to top, and the wave-resistant water retaining wall 5 near one side is set to a vertical structure. A river bank planting layer 6 is arranged along the width direction of the top of the river bank 2. Aquatic plants and herbaceous plants are planted on the river bank planting layer 6. A demolition section 51 with a height of 0.6 - 1.2 m is demolished on the top of the wave-resistant water retaining wall 5. A capping layer 7 is arranged on the top of the wave-resistant water retaining wall 5 after demolition. The capping layer 7 is arranged on the side close to the river course 3. The capping layer 7 can reinforce the top of the wave-resistant water retaining wall 5 and improve the slope protection ability of the wave-resistant water retaining wall 5. A retaining wall reinforcement groove is dug downward on the river bank 2 near the wave-resistant water retaining wall 5. A landscape retaining wall 8 is built in the retaining wall reinforcement groove. The top height of the landscape retaining wall 8 is the same as the top height of the demolition section 51. A repair bed layer 9 is dug downward on the river bottom 1 near the wave-resistant water retaining wall 5. A wave-resistant stone layer 10 is laid above the repair bed layer 9. The wave-resistant stone layer 10 is composed of a plurality of four-corner Y-shaped wave-resistant stones stacked. A stone pressing layer 11, a non-woven fabric layer 12 and a river bottom planting layer 13 are sequentially arranged above the wave-resistant stone layer 10 from bottom to top. Aquatic plants and herbaceous plants are planted on the river bottom planting layer 13. Preferably, the stone pressing layer uses stone pressing with a particle size of 500 - 700 mm.

[0013] The construction process of this utility model is as follows: First, make the four-corner Y-shaped wave-resistant stones. Then, demolish the top of the wave-resistant water retaining wall 5. The height of the demolished section 51 is 0.6 - 1.2 m. After the demolition of the demolished section 51, clean the sundries on the top of the wave-resistant stones. Then, pour a capping layer with concrete inside the wave-resistant water retaining wall 5. After that, dig a retaining wall reinforcement groove downward on the slope top on the side far from the wave-resistant water retaining wall 5. A landscape retaining wall 8 is built in the retaining wall reinforcement groove. The top height of the landscape retaining wall 8 is the same as the top height of the demolished section 51. Then, backfill planting soil on the slope tops of the landscape retaining wall 8 and the wave-resistant water retaining wall 5 to form a riverbank planting layer 6. The height of the riverbank planting layer 6 gradually increases from the direction of the wave-resistant water retaining wall 5 to the direction of the landscape retaining wall 8. Then, dredge the riverbed of the river bottom 1. The dredging depth is not less than 1 mm. Then, clean the sundries on the riverbed surface to form a riverbed repair layer 9. Then, stack the pre-prepared four-corner Y-shaped wave-resistant stones layer by layer on the riverbed repair layer 9. Subsequently, a pressing stone layer 11, a non-woven fabric layer 12, and a river bottom planting layer 13 are sequentially arranged from bottom to top above the wave-resistant stone layer 10 according to the structural requirements. Finally, aquatic plants and herbaceous plants are planted on the riverbank planting layer 6 and the river bottom planting layer 13. Compared with the traditional revetment structure, the advantages of this utility model are as follows: First, the original vertical revetment structure is improved. A section of the original vertical wave-resistant water retaining wall 5 is demolished, and then a landscape retaining wall 8 is set on one side of the wave-resistant water retaining wall 5. The height of the landscape retaining wall 8 is the same as the height of the original wave-resistant water retaining wall 5. Such a structural arrangement can, on the one hand, meet the flood control requirements of the riverbank 2, and on the other hand, increase the revetment area of the riverbank 2, improve the revetment grade of the riverbank 2, and enhance the revetment ability of the riverbank 2, achieving the basic functions of physical resistance, disaster reduction, and disaster prevention. Second, the four-corner Y-shaped wave-resistant stones are introduced into the revetment structure of the riverbank 2. After deeply dredging the riverbed of the river bottom 1, a wave-resistant stone layer 10, a pressing stone layer 11, and other revetment layers are laid on the riverbed 1. The pressing stones are used to squeeze the wave-resistant stones on the riverbed of the river bottom 1, which can play a role in improving the bearing capacity of the riverbed 1. Moreover, when using the four-corner Y-shaped wave-resistant stones to slope protect the riverbank 2, a pore support structure is formed through the triangular support composed of the four-corner Y-shaped wave-resistant stones, which can realize the formation of an activity and breeding space for reptiles, shellfish, and fish in the voids, reduce the damage of wind and waves to aquatic animals. At the same time, the four-corner Y-shaped wave-resistant stones can maximize the elimination of the impact of water waves on the shore. By adjusting the size of the wave-resistant stones in different situations and using the excellent compressive strength of concrete to bear the upper material load, the wave-resistant and slope-protecting ability of the four-corner Y-shaped wave-resistant stones can be significantly improved. In addition, root plants and herbaceous plants are planted on the river bottom planting layer 13. The combination of herbaceous plants and root plants is beneficial to the reinforcement of soils at different depths by plant roots, playing a positive role in soil and water conservation, restoring the river channel ecology, and enhancing the landscape effect.

[0014] Furthermore, the four-corner Y-shaped wave-resistant stone is a C25 precast concrete member, which is cast with concrete of C25 type. The four-corner Y-shaped wave-resistant stone includes a main rod section 101 and three secondary rod sections 102. The main rod section 101 is vertically arranged, and the three secondary rod sections 102 are circumferentially and evenly installed at the lower end of the main rod section 101. The included angle α between the central axes of two adjacent secondary rod sections 102 is 120°. The included angle β between the end of the secondary rod section 102 far from the main rod section 101 and the horizontal plane is 30°. After the four-corner Y-shaped wave-resistant stones are stacked layer by layer, gaps will be formed between adjacent four-corner Y-shaped wave-resistant stones. When the water waves in the river channel 3 are too large, the four-corner Y-shaped wave-resistant stones have better wave-resistant ability, avoiding the direct impact of water waves on the wave-resistant and water-blocking wall 5. This can slow down the impact force of water waves on the wave-resistant and water-blocking wall 5 and improve the service life of the wave-resistant and water-blocking wall 5. At the same time, the inhabiting animals in the river channel 3 can survive in the internal gaps of the four-corner Y-shaped wave-resistant stones. The four-corner Y-shaped wave-resistant stone revetment with this structure can beautify the vertical revetment, resist water waves, provide a shelter for aquatic organisms, form a shallow-shallow water-deep water ecological wetland environment, and play a positive role in soil and water conservation, river ecological restoration, and landscape effect improvement. Preferably, the four-corner Y-shaped wave-resistant stones can eliminate the impact of water waves on the shore to the greatest extent, adjust the size of the wave-resistant stones under different conditions, and bear the upper material load with the excellent compressive strength of concrete. The sizes of the main rod section 101 and the secondary rod sections 102 are the same. The diameter of the main rod section 101 gradually increases from the upper end to the lower end of the main rod section 101, and the diameter of the secondary rod section 102 gradually increases from the end of the secondary rod section 102 to the direction of the main rod section 101. In the actual use process, the diameter and length of the main trunk section are determined according to the actual use requirements. In the actual use process, the wave-resistant revetment with the upper end diameter of 80 mm, the lower end diameter of 100 mm, and the length of 200 mm of the main rod section has the best wave-resistant ability.

[0015] Furthermore, a gravel layer 14 is arranged between the stone pressing layer 11 and the non-woven fabric layer 12. The gravel layer 14 is arranged above the stone pressing layer 11, which can achieve a better contact effect between the non-woven fabric layer 12 and the stone pressing layer 11, and is more conducive to realizing the pressing of the four-corner Y-shaped wave-resistant stones, thereby being conducive to improving the bearing capacity of the four-corner Y-shaped wave-resistant stones. The gravel used in the gravel layer 14 has a particle size of 150 - 300 mm.

[0016] Furthermore, a river bottom reinforcement groove is dug between the river bank concrete layer 4 and the repair bed layer 9, and a river bottom concrete layer 15 is poured in the river bottom reinforcement groove, which can improve the connection strength between the river bottom 1 and the river bank 2, and its purpose is to improve the wave-resistant grade of the river bank 2.

[0017] Furthermore, in order to enhance the aesthetic appeal of the riverbank 2, a layer of cobblestone layer 16 is laid between the landscape retaining wall 8 on the side far from the wave - resistant water - retaining wall 5 and the top of the riverbank planting layer 6, and also between the ballast layer 11 and the top of the river - bottom planting layer 13. The width of the cobblestone layer 16 is 300 - 350 mm, the thickness is 120 - 150 mm, and the diameter of the cobblestones used in the cobblestone layer 16 is 20 - 50 mm.

[0018] Furthermore, the capping layer 7 is made of bluestone. The width of the capping layer 7 is 700 - 900 mm, the height is 400 - 500 mm, and the thickness is 200 - 300 mm. The capping layer 7 can slow down the scouring of the water wave against the top of the wave - resistant water - retaining wall 5 and improve the service life of the wave - resistant water - retaining wall 5.

[0019] Furthermore, the heights of the wave - resistant stone layer 10, the ballast layer 11, the non - woven fabric layer 12, and the river - bottom planting layer 13 are arranged to incline upward in sequence from the direction of the river channel 3 to the wave - resistant water - retaining wall 5. The height of the higher end of the river - bottom planting layer 13 from the capping layer 7 is 300 - 500 mm. By setting the heights of the wave - resistant stone layer 10, the ballast layer 11, the non - woven fabric layer 12, and the river - bottom planting layer 13, it is beneficial to improve the bearing capacity of the revetment and achieve a better revetment use effect.

[0020] Furthermore, the height of the river - bottom planting layer 13 is greater than 300 mm. The width of the river - bottom planting layer 13 laid along the width direction of the river bottom 1 is 4.5 - 8 m. The widths of the wave - resistant stone layer 10 and the ballast layer 11 laid along the width direction of the river bottom 1 are 500 - 900 mm more than the width of the river - bottom planting layer 13. The wave - resistant stone layer 10, the ballast layer 11, the non - woven fabric layer 12, and the river - bottom planting layer 13 are arranged from one side of the riverbank 2 towards the center of the river channel 3. It has a strong bearing capacity, and thus a greater ability to resist water waves, and can meet the survival of inhabiting animals, achieving both ecological benefits and landscape value.

Claims

1. An ecological restoration structure for river bank protection applying a new type of wave-resistant stone, comprising a river bottom (1), a river bank (2) and a river channel (3). A casting groove is dug on the river bottom near one side of the river bank (2), and a river bank concrete layer (4) is cast in the casting groove. Above the river bank concrete layer (4), a wave-resistant water retaining wall (5) connected to the river bank is built. At the top of the river bank (2), a river bank planting layer (6) is arranged along the width direction of the river bank (2), and it is characterized in that: Demolish a section of the demolition section (51) with a height of 0.6 - 1.2 m at the top of the wave-resistant retaining wall (5). A pressing top layer (7) is provided at the top of the wave-resistant retaining wall (5) after demolition. The pressing top layer (7) is arranged on the side close to the river channel (3). A retaining wall reinforcement groove is dug on the river bank (2) close to the wave-resistant retaining wall (5), and a landscape retaining wall (8) is built in the retaining wall reinforcement groove. The top height of the landscape retaining wall (8) is the same as the top height of the demolition section (51). A repair bed layer (9) is dug downwards on the river bottom (1) close to the wave-resistant retaining wall (5). An anti-wave stone layer (10) is laid above the repair bed layer (9). The anti-wave stone layer (10) is composed of multiple four-corner Y-shaped anti-wave stones stacked. Above the anti-wave stone layer (10), a pressing stone layer (11), a non-woven fabric layer (12), and a river bottom planting layer (13) are arranged in sequence from bottom to top.

2. The ecological restoration structure of the river bank revetment applying the new anti-wave stones according to claim 1, characterized in that: The four-corner Y-shaped anti-wave stone is a C25 precast concrete member. The four-corner Y-shaped anti-wave stone includes a main rod section (101) and three secondary rod sections (102). The main rod section (101) is arranged vertically. The three secondary rod sections (102) are circumferentially and evenly installed at the lower end of the main rod section (101). The included angle α between the central axes of two adjacent secondary rod sections (102) is 120°. The included angle β between the end of the secondary rod section (102) far from the main rod section (101) and the horizontal plane is 30°.

3. The ecological restoration structure of a river bank revetment using a new type of anti-wave stone according to claim 2, characterized in that: The main rod section (101) and the secondary rod sections (102) have the same size. The diameter of the main rod section (101) gradually increases from the upper end to the lower end of the main rod section (101). The diameter of the secondary rod section (102) gradually increases from the end of the secondary rod section (102) to the direction of the main rod section (101).

4. The ecological restoration structure of a riverbank revetment using a new type of wave-resistant stone according to claim 1, characterized in that: A gravel layer (14) is arranged between the pressing stone layer (11) and the non-woven fabric layer (12).

5. The ecological restoration structure of the riverbank revetment applying the novel anti-wave stones according to claim 1, characterized in that: A river bottom reinforcement groove is dug between the river bank concrete layer (4) and the repair bed layer (9), and a river bottom concrete layer (15) is poured in the river bottom reinforcement groove.

6. The ecological restoration structure of the river bank protection using the novel anti-wave stones according to claim 1, characterized in that: A layer of cobblestone layer (16) is laid between the landscape retaining wall (8) on the side far from the wave-resistant retaining wall (5) and the top of the river bank planting layer (6), and between the pressing stone layer (11) and the top of the river bottom planting layer (13). The width of the cobblestone layer (16) is 300 - 350 mm, the thickness is 120 - 150 mm, and the diameter of the cobblestones used in the cobblestone layer (16) is 20 - 50 mm.

7. An ecological restoration structure for river bank protection using a new type of wave-resistant stone according to claim 1, characterized in that: The pressing top layer (7) is made of bluestone. The width of the pressing top layer (7) is 700 - 900 mm, the height is 400 - 500 mm, and the thickness is 200 - 300 mm.

8. The ecological restoration structure of a river bank revetment using a new type of wave-resistant stone according to claim 1, characterized in that: The anti-wave stone layer (10), the pressing stone layer (11), the non-woven fabric layer (12), and the river bottom planting layer (13) are arranged obliquely upwards in sequence from the river channel (3) to the wave-resistant retaining wall (5). The height of the higher end of the river bottom planting layer (13) from the pressing top layer (7) is 300 - 500 mm.

9. The ecological restoration structure of a riverbank revetment using a new type of wave-resistant stone according to claim 1, characterized in that: The height of the river bottom planting layer (13) is greater than 300 mm. The width of the river bottom planting layer (13) laid along the width direction of the river bottom (1) is 4.5 - 8 m. The widths of the wave-resistant stone layer (10) and the pressing stone layer (11) laid along the width direction of the river bottom (1) are 500 - 900 mm more than the width of the river bottom planting layer (13).

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