River channel structure with composite structure

Abstract

The utility model relates to the field of river regulation, in particular to a river structure with a composite structure. The section of the river channel comprises a composite structure formed by a narrow groove and a wide beach so as to meet the requirements for small flow and large flow, the narrow groove suitable for small flow is formed in the lower portion of the section, and circulation of the river channel in the small flow is guaranteed. A wide beach suitable for large flow exists in the section, and the flood discharge requirement of the river channel under the large flow is met. The wide-beach operation water surface line is larger than the narrow groove, the two sides of the wide beach are river outer retaining walls, and the shape and stability of the river are kept; inner retaining walls are arranged on the two sides of the narrow groove, and a pedestrian path is laid above the inner retaining walls to provide a hydrophilic space. The river channel structure can meet different requirements under the condition of two kinds of water flow, and the people-friendly property and the ecological property of water control are improved.

Description

Technical Field

[0001] The utility model relates to the field of river regulation, and specifically relates to a river channel structure with a composite structure. Background Art

[0002] A river channel is a complex ecological system integrating land, plants, animals, and water bodies, with functions such as regulating runoff, storing water, transporting sediment, and providing habitats for aquatic and terrestrial animals. It reaches a dynamically balanced state that can be adjusted by itself under the interaction with the surrounding natural and social environments. Rivers provide functions such as drinking water sources, flood discharge, and landscapes for cities and play an important role in the development of cities. However, with frequent human intervention, erosion and siltation often occur in natural rivers, which are prone to water disasters, hinder water conservancy development, and there will also be dead water areas leading to black and smelly water bodies. To eliminate disasters and promote benefits, appropriate measures must be taken to renovate the river channel, including projects such as river training, dredging, and bank protection.

[0003] During the process of river channel renovation, most river channels mainly adopt the following measures: 1) Desilting and dredging: Dredging and desilting the river channel through a dredger, dry desilting, etc. to dredge the river channel; 2) Riverbed renovation: Laying a riverbed of grouted stone, block stone, crushed stone, or concrete, and shaping a certain slope; 3) Revetment renovation: Adopting retaining wall forms such as brick masonry, grouted stone, concrete, reinforced concrete, etc., and some also adopt ecological frames, planting soil + turf, etc.; 4) Landscape on the shore: Combining river channel renovation, improving the landscape on both sides of the river channel to create a certain water treatment landscape. In actual projects, one or more of the above measures are adopted for river channel renovation projects, and certain effects have also been achieved. However, over time, the following problems have gradually emerged: 1) The river channel has only one wide cross-section. When the flow rate is small, the flow velocity of the river water is low, and the problem of river channel siltation still cannot be solved; if a flow channel with an appropriate width is not planned, the river water is likely to form a dead water area within the wide river channel plane, which will lead to water quality deterioration and black and smelly water bodies over time; 2) Although a certain landscape on the shore has been created for the river channel, tourists can only appreciate and view the water scenery and cannot directly contact the water body, so its hydrophilicity and experience are poor; 3) Although a certain landscape on the shore has been created for the river channel, tourists can only appreciate and view the water scenery and cannot directly contact the water body, so its hydrophilicity and experience are poor. Therefore, there is an urgent need to provide a new structure for river channel governance that takes into account different passing water volumes of the river channel, keeps the river water from being black and smelly, and can meet the ecological and hydrophilic properties of the river channel. Content of the Utility Model

[0004] In view of the disadvantages of the existing river regulation cross-section, such as easy siltation, easy blackening and odorization, and insufficient ecological and hydrophilic properties, the present invention provides a wide-beach and narrow-channel low-water-level composite structure suitable for river regulation to meet the different requirements under two water flow conditions. At the same time, to improve the people-friendly and ecological nature of water treatment, a hydrophilic platform is constructed in the river, and the water system connection is opened up to achieve ecological water treatment.

[0005] To solve the above technical problems, the present invention is solved by the following technical solutions:

[0006] A river channel structure with a composite structure, the river channel cross-section includes a composite structure formed by a narrow channel and a wide beach to adapt to the needs of small and large water flows. There is a narrow channel suitable for small water flows at the lower part of the cross-section to ensure the flow of the river channel at small water flows. There is a wide beach suitable for large water flows in the cross-section to ensure the flood discharge requirements of the river channel at large water flows. The operating water surface line of the wide beach is higher than that of the narrow channel. The two sides of the wide beach are outer retaining walls of the river channel to maintain the shape and stability of the river channel. Inner retaining walls are provided on both sides of the narrow channel, and a pedestrian walkway is laid above the inner retaining walls to provide a hydrophilic space.

[0007] Furthermore, the bottoms of the narrow channel and the wide beach adopt an ecological riverbed, which is composed of crushed stones, block stones, and cobblestones to ensure the connection between river water and groundwater. The outer retaining walls on both sides of the wide beach can adopt ecological frames, that is, planting soil and turf, to enhance the ecological nature. The outer retaining walls can also be partially in the form of brick masonry, stone masonry, concrete, reinforced concrete, etc.

[0008] Furthermore, the narrow channel includes an artificial wetland located on the ecological riverbed and arranged beside the ecological riverbed. A plant layer is planted above the artificial wetland to promote the development of the aquatic ecosystem. Native plant communities and animal communities are appropriately arranged in the river channel to further restore the diversity of the ecosystem. By reconstructing the aquatic ecosystem in the artificial wetland, the interest and health of the river channel are improved.

[0009] Furthermore, based on the current river channel streamline, local optimization design is carried out in combination with the cross-section shape, surrounding functions, etc. to achieve smooth overall streamline and good hydraulic conditions of the river channel. Of course, if necessary, the local part of the river channel can also be diverted or adjusted in combination with the needs of urban functions. This can ensure the smoothness of the main channel of the river channel, and the plane streamline of the river channel is a straight line type I, an S-bending type, or an L-turning type.

[0010] Furthermore, the outer retaining wall is provided with steps, and the pedestrian walkway can be connected to the road surfaces on both sides of the river channel through the steps.

[0011] Furthermore, the cross-section shapes of the narrow channel and the wide beach are rectangular, inverted trapezoidal, irregular shapes and their combinations.

[0012] Furthermore, the water level of the river channel is kept at a low level during normal operation, with water only in the narrow trough, maintaining a certain flow velocity to prevent sedimentation, flow interruption, and black and odorous problems. The hydrophilic walkway is opened to enhance the hydrophilicity and recreational value of the river channel.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] There is a narrow trough suitable for low flow rates at the lower part of the cross-section, and a wide beach suitable for high flow rates within the cross-section. When the flow rate is low, the river water flows in the narrow trough, maintaining a certain flow velocity, without sedimentation, flow interruption, or black and odorous problems, and the river water will not flood facilities such as the pedestrian walkway in the narrow trough and the river channels on both sides. This not only ensures the operation needs of the river channel but also ensures the normal operation of the water purification facilities and hydrophilic facilities on both sides. When the flow rate is high, the river water flows within the entire wide beach, maintaining a sufficient flood discharge channel, without blockage or overtopping of the embankment, and the river water will not flood facilities such as the river embankment and the pedestrian walkway on the shore on both sides. This not only ensures the flood control needs of the river channel but also ensures the safety of the road traffic facilities and personnel travel on both sides.

[0015] The design of the composite cross-section can seamlessly switch between the two cross-sections during operation, which not only enhances the guarantee of river water quality and the safety of flood control and drainage of the river channel but also increases the hydrophilicity and interestingness of the river channel landscape. Through the integration of ecological transformation technologies such as ecological river beds and constructed wetlands, the connection channel between river water and groundwater is further strengthened, the aquatic ecosystem of the river channel is reshaped, and the self-purification ability and health level of the river channel ecosystem are also improved, with better ecological properties.

[0016] The new technology of the low-water-level composite cross-section structure of wide beach and narrow trough integrates technologies such as wide beach, narrow trough, low water level, ecological transformation, and hydrophilicity improvement, with good integration and demonstration. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a partial plan view of A of a specific implementation of the utility model;

[0018] Figure 2 is a cross-sectional view of A of a specific implementation of the utility model;

[0019] Figure 3 is a partial plan view of B of another specific implementation of the utility model;

[0020] Figure 4 is a cross-sectional view of B of another specific implementation of the utility model.

[0021] In the figures, each reference numeral: 1, river channel; 2, wide beach; 3, narrow trough; 4, pedestrian walkway; 5, constructed wetland; 6, plant layer; 7, animal community; 8, ecological river bed; 9, inner retaining wall; 10, outer retaining wall; 11, low water level line; 12, high water level line. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solution of the invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the invention without creative efforts shall fall within the scope of protection of the invention.

[0023] Referring to Figure 1 to Figure 4 , the present invention will be further described in detail:

[0024] In the description of the invention, it should be noted that terms such as "large", "small", "upper", "lower", "inner", "outer", "high", "low", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the invention.

[0025] Please refer to Figures 1-2 . The present invention provides a new technology for the composite cross-section structure of wide beach and narrow trough at low water level suitable for river regulation and improvement. Taking River A as an example, there are mainly River 1 and its surrounding supporting facilities. There is a relatively narrow narrow trough 3 in River 1. When the river flow is small, the river water flows in the narrow trough 3, which can ensure sufficient flow velocity, ensure that the river channel is not silted up, there is no dead zone in the river water, and the water quality does not deteriorate. At this time, the water level in the river channel is maintained at a relatively low level, near the water level line 10. There is a relatively wide wide beach 2 in River 1. When the river flow is large, the river water flows in the wide beach 2, which can ensure sufficient cross-sectional area of flow, ensure that the river channel is not congested, the river water does not overflow the embankment, and there is no impact on the surrounding area. At this time, the water level in the river channel is maintained at a relatively high level, near the low water level line 11. It should be added that the wide beach 2, narrow trough 3, low water level line 10 and high water level line 11 referred to here are all relative concepts, and are only for illustration in the figure. In actual engineering applications, the actual flow data, river width and other basic data should be combined for recheck calculation.

[0026] Furthermore, to enhance the hydrophilicity of the river channel, a pedestrian walkway 4 is arranged inside the river channel 1. When the river water flows in the narrow trough 3, the walkway 4 can be connected to the road surfaces on both sides of the river embankment through steps (not shown in the figure), forming an effective hydrophilic activity area and increasing hydrophilicity and interest. Meanwhile, an artificial wetland 5 is arranged in the river channel to further purify the upstream water through natural purification functions, improve the water quality of the river channel, and also lay out a landscape plant community and an animal community 7 in the river channel to gradually restore the original ecological system of the natural river channel, improve the self-purification ability of the river channel, and construct a healthy aquatic ecological system. The artificial wetland 5 and the landscape plant community 6 in the narrow trough 3 can be arranged according to the actual engineering situation, and can be arranged on one side, locally, or the artificial wetland 5 and the landscape plant community 6 can be not arranged in some river reaches, etc.

[0027] An ecological riverbed 8 is adopted at the bottom of the river channel, which can be composed of one or more of gravel, rubble, cobblestones, etc., and can realize the connection and conversion between river water and groundwater, and keep the water cycle unobstructed. The external retaining wall or revetment 10 of the river channel can adopt various forms. Figure 2 The river channel adopts a vertical concrete retaining wall on the left side and a soil revetment on the right side, and can also adopt a combined operation of one side, both sides, and vertical type ( Figure 4 ), slope type. Its material can adopt structural forms such as concrete, grouted stone, brick masonry, etc., and can also adopt ecological forms such as ecological frames and planting soil. The above forms, materials, etc. are all within the protection scope of this invention patent.

[0028] Embodiment

[0029] A certain river channel was originally a black and odorous river channel and did not meet the flood control requirements, and was renovated using this composite structure. After renovation, the elevations on both sides of the river bank are 21.00m, the width of the narrow trough is about 4.50m, the bottom elevation is 18.00m, a pedestrian walkway is arranged on one side, the width of the hydrophilic pedestrian walkway is about 1.90m, the top elevation is 18.60m, the width of the wide beach is about 10.00m, the top elevation is 21.15m, and the flood control reaches the 50-year return period required by the plan. During low flow, the river channel does not silt up, does not turn black and odorous, does not dry up, and the self-purification ability of the aquatic ecological system is gradually improved; during high flow, the river channel is not blocked, does not overflow the embankment, and does not accumulate water.

[0030] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. A river channel structure with a composite structure, characterized in that: The river channel section includes a composite structure formed by a narrow groove (2) and a wide beach (3). The lower part of the section has a narrow groove (2) adapted to small flow, and the inside of the section has a wide beach (3) adapted to large flow. The running water surface line of the wide beach (3) is larger than that of the narrow groove (2). Both sides of the wide beach (3) are outer retaining walls (10) of the river channel. Inner retaining walls (9) are arranged on both sides of the narrow groove (2), and a pedestrian walkway (4) is laid above the inner retaining wall (9).

2. The river channel structure with a composite structure according to claim 1, characterized in that: The narrow groove (2) includes an ecological riverbed (8) and an artificial wetland (5) arranged beside the ecological riverbed (8).

3. The river channel structure with a composite structure according to claim 2, characterized in that: The ecological riverbed (8) is composed of crushed stones, boulders and pebbles.

4. The river channel structure with a composite structure according to claim 2, characterized in that: A plant layer (6) is planted above the artificial wetland (5).

5. The river channel structure with a composite structure according to claim 1, characterized in that: The plane streamlines of the river channel (1) are I straight line type, S curved type, and L turning type.

6. The river channel structure with a composite structure according to claim 1, characterized in that: The outer retaining wall (10) is provided with steps, and the pedestrian walkway (4) can connect the road surfaces on both sides of the river channel (1) via the steps.

7. The river channel structure with a composite structure according to claim 1, characterized in that: The cross-sectional shapes of the narrow groove (2) and the wide beach (3) are rectangular, inverted trapezoidal, irregular, or a combination thereof.

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