CN113684791B - An arc-shaped waterscape dam based on vortex guiding drift and its design method - Google Patents

Abstract

The invention discloses an arc-shaped waterscape dam based on vortex guiding and drifting. The small circular arc dam body is tangent to the large circular arc dam body, side walls are provided on both sides of the small circular arc dam body, the open end of the small circular arc dam body is set upstream, and the left and right banks are adjacent to the dam body. It is a floating object collection area, and there is a garbage salvage device in the floating object collection area. This waterscape dam generates vortices in the area near the dam with the help of arc streamlines, and guides the floating objects to flow to the collection areas on both banks. It flows into the downstream river, and the air bubbles generated at the same time increase the dissolved oxygen to the water body, which is helpful for the growth of aquatic animals and plants, and helps to control the black and odorous water body. Landscape is guaranteed.

Description

An arc-shaped waterscape dam based on vortex guiding drift and its design method

technical field

The invention belongs to the technical field of small and medium-sized river waterscape water conservancy projects, and particularly relates to an arc-shaped waterscape dam based on vortex guiding and drifting and a design method thereof.

Background technique

With global climate change, the problem of frequent extreme weather is becoming more and more prominent in various regions of my country. For small and medium-sized rivers flowing through cities, towns and villages, the annual runoff changes significantly, and there are alternating seasons of high and dry, which is not conducive to people's living water and river courses. Ecological landscape maintenance.

By cutting off the water flow and using gates or other switch structures, the barrage can realize the regulating effect of reducing flood and replenishing the runoff of small and medium-sized rivers. During the operation of the barrage, a large number of floating objects are easy to accumulate, including domestic garbage, algae, aquatic plants, dead branches and leaves, etc. The floating objects in the river not only cover the river surface, affect the river landscape, deteriorate the water body, and cause the fish to lack oxygen, but also adversely affect the flood discharge capacity, water supply, and power generation of the river.

The existing floating matter treatment of small and medium-sized river barrages mainly uses filter screens or trash fences to block them, which requires secondary manual cleaning, which is not conducive to the flow of water and the collection of floating matter. In addition, the salvage efficiency is low due to the dispersion of floating objects. At present, more and more automated methods of salvaging floating objects have been tried, and a variety of floating object salvaging devices have been applied, including floating object fixed salvage machines, salvage boats, mobile fishing rods, and salvage conveyor belts. Among them, the most widely used are fixed salvage machines and salvage conveyor belt devices with low cost and convenient maintenance, but most of the barrages are straight, and the floating objects can only be salvaged locally. Therefore, there is an inefficient operation problem that the salvage device does not match the dispersion degree of the floating object.

The Chinese utility model patent with the announcement number CN205557464U discloses "a cleanable intelligent flood control dam", which improves the flood-carrying capacity by placing a transmission filter in front of the intake gate to remove floating objects, but this transmission filter It is difficult to arrange on a large scale along the entire width of the dam, and the salvage and cleaning effect is limited. For example, the Chinese utility model patent publication number CN211773498U discloses "a floating object salvage device for urban landscape water improvement", which can continuously and effectively collect and salvage floating garbage. Although the salvage range can be adjusted according to the width of the water surface, the horizontal Salvage across the entire river, especially in urban areas, is not conducive to maintenance and ecological landscaping, and is difficult to use on a large scale.

SUMMARY OF THE INVENTION

In view of the above-mentioned problems, the present invention proposes an arc-shaped waterscape dam based on vortex guiding and a design method thereof. While realizing flood regulation and water storage, it guides the floating objects to move into the arcs on both sides, and cooperates with fixed automatic salvage devices to realize intelligent continuous operation and solve the problem of the lack of ecological landscape function of the barrage in the above-mentioned background.

For achieving the above object, the present invention provides the following scheme:

An arc-shaped waterscape dam based on vortex guiding and drifting, comprising an arc-shaped dam body and a garbage salvage device;

The arc-shaped dam body includes a large circular arc dam body arranged in the middle and a small circular arc dam body symmetrically arranged on both sides of the large circular arc dam body. Tangent, the small circular arc dam body is provided with side walls on both sides, the open end of the small circular arc dam body is set upstream, and the left and right banks adjacent to the dam body are the floating object collection area, and the floating object collection area is set up. There is a garbage salvage device.

Further, the ratio of the radius of the small arc dam body to the large arc dam body is greater than 1/8 and not greater than 1/2 and greater than 1/8.

Further, the large arc dam body is provided with a plurality of bottom holes, and the opening and closing of the bottom holes is controlled by a screw lift gate, and a bubble generator is arranged around the bottom hole, and the bubble generator is formed by surrounding the edge of the bottom hole. The pipeline is connected to the air pump through the top of the dam along the junction of the large and small arcs. The water level monitors are arranged near the shore and the middle of the left and right sides of the arc-shaped waterscape dam, and the flow monitors are arranged in front of the gate. The water level monitors and the flow rate The monitor is connected to the sensor.

Further, the garbage salvage device includes a wheel shaft and a water filter conveyor belt that are inclined at a certain angle to the horizontal plane. The bottom end of the conveyor belt is submerged below the water surface of the collection area, and the top of the conveyor belt is connected to a motor drive device, and there is a garbage collection box directly below.

Further, the bubble generator specifically includes an air inlet pipe, an air storage cavity, a ventilation standpipe, an air outlet pipe, a through hole, and an exhaust hole, the air outlet pipe is located directly below the bottom hole, and the left and right ends of the air outlet pipe are connected with each other. The ventilation riser is connected, and the gas is conveyed by the through hole and then discharged to the floating water surface through the uniform exhaust hole. The air cavity can be ventilated by an air pump on the outside of the air inlet pipe.

Further, the water level monitors arranged at the riverside and the center of the river and the flow monitor in front of the gate are fixed at the water-facing surface of the large circular arc of the dam body.

Further, the garbage salvage device adjusts the working cycle according to the water level and flow information sent by the sensor, and the transportation time of the garbage collection box is adjusted accordingly. Miscellaneous moisture and hooking flotsam.

Further, the large circular arc dam crest of the arc-shaped waterscape dam is arranged with landscaping fountain nozzles at equal intervals, and the fountain nozzle is equipped with a converter, which sprays directionally downstream, and the spraying mode can be changed according to the flow rate to create different fountain landscapes.

Further, the fountain nozzle is connected with the corresponding water pumping system, and the fountain lights are arranged around to match the bottom hole to flow out symmetrically.

The present invention also provides a method for designing an arc-shaped waterscape dam based on vortex drifting, the specific steps of which are as follows:

S1. Investigate engineering conditions for engineering site selection, including boundary conditions and initial conditions for river water depth, flow velocity, and river width

S2. Use the drawing software to scale and adjust the diameter ratio of the circular arc and the size of the circumference angle, and make a corresponding series of test models;

S3. Under certain boundary conditions, use fluid mechanics simulation software to select a fluid model according to the river flow state to simulate the vortex drifting situation that may occur within the general flow velocity range of the river, observe the flow velocity vector direction in the upstream near dam area and the floating object collection area, and analyze the resulting vortex size, vortex duration and stable position;

S4. According to the specific conditions of the project and according to the simulation results, the final dam body streamline design scheme is selected to make a physical model for experimental simulation, and the final dam type scheme is determined by the experimental results.

Compared with the prior art, the beneficial effects of the present invention are: the barrage of the present invention uses the knowledge of fluid mechanics to design the streamline of the dam body, and uses the arc structure to guide the water flow and generate vortices within a reasonable range, so as to divert the floating objects on the river surface to the surface. The collection and salvage places on both sides of the barrage effectively solve the problem that the floating objects on the river surface are scattered and difficult to salvage, and the directional drifting saves the salvage time and improves the salvage efficiency. In addition, the installation of the bubble assembly can cooperate with the arc-shaped dam to further divert the floating objects in the river. Under the action of the air pump, the air first reaches the side of the air storage cavity through the air intake pipe, and enters the ventilation after the adjustment of the air storage cavity. The riser reaches the air outlet through the through hole, and bubbles are generated through the exhaust hole. The air bubbles generated by the pipeline can effectively lift the suspended pollutants in the river, so that the garbage suspended in the middle is driven to the surface of the river by the bubbles and accumulates at the salvage place. When the gate is open, it can also prevent the garbage under the water from rushing downstream to a considerable extent. At the same time, the bubble component can promote the fluidity of the water body, increase the dissolved oxygen content, and the continuous aeration can further reduce the reproduction of anaerobic microorganisms, help the growth of aquatic animals and plants in the water body, and effectively curb the black and odorous water body. produce. In winter, air bubbles can also solve the problem of water freezing and unable to flow. By adding components such as fountains, this device can meet the basic needs of small and medium-sized rivers to reduce floods and make up for dryness, and at the same time, it can create a spectacular fountain waterscape, provide support for the tourism industry, and strive to create a humanistic and ecological waterfront. Therefore, the device has a good application prospect.

Description of drawings

Fig. 1 is the axonometric view of a kind of arc-shaped waterscape dam proposed by the present invention;

Fig. 2 is the enlarged view of A place in Fig. 1;

FIG. 3 is an enlarged view of B in FIG. 1 .

4 is a front view of a curved waterscape dam proposed by the present invention;

5 is a top view of a curved waterscape dam proposed by the present invention;

Fig. 6 is C-C in Fig. 5 in the sectional view;

Fig. 7 is the enlarged view of D place in Fig. 6;

Fig. 8 is the sectional view of E-E in Fig. 5;

Fig. 9 is the F-F direction sectional view in Fig. 5;

Fig. 10 is the flow velocity vector diagram of the horizontal plane when r10cm-R20cm in the embodiment of the present invention 2;

Fig. 11 is the flow velocity vector diagram of the r8cm-R24cm horizontal plane in the embodiment of the present invention 2;

Fig. 12 is the flow velocity vector diagram of r6cm-R28cm horizontal plane in the embodiment of the present invention 2;

Figure 13 is the flow velocity vector diagram of the r4cm-R32cm horizontal plane in Example 2 of the present invention;

In the picture: 1. Dam body, 2. Bottom hole, 3. Gate, 4. Large arc dam body, 5. Small arc dam body, 6. Air intake pipe, 7. Air storage cavity, 8. Ventilation riser , 9. Air outlet pipe, 10. Exhaust hole, 11. Air outlet cavity, 12. Through hole, 13. Water level monitor, 14. Flow monitor, 15. Fountain nozzle, 16. Wheel set, 17. Water filter Net, 18. Motor drive, 19. Receiver, 20. Garbage collection box, 21. Side wall.

Detailed ways

The technical solutions and specific embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention.

[Example 1]

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The following examples are only preferred implementations of the present invention, rather than all embodiments.

Referring to Figure 1, Figure 4, Figure 5 and Figure 9, an arc-shaped waterscape dam for guiding and collecting floating objects includes an arc-shaped dam body 1, a bottom hole 2, and a gate 3. The arc-shaped dam body 1 is composed of a large circular arc dam. Body 4 and small arc dam body 5, the middle and lower part of the large arc dam body 4 is provided with 4 rectangular bottom holes 2, the opening and closing of the bottom holes 2 are controlled by the gate 3, the opening of the gate 3 is adjustable, the small arc A parallel arc-shaped air intake pipe 6 is arranged on the dam body 5. One end of the air intake pipe 6 in the dam is connected to the air storage cavity 7. The ventilation riser 8 is installed vertically at the tangent of the large and small arcs, and directly leads to the dam crest. The air storage cavity 7, the structure here refers to FIG. 3, the other end of the ventilation riser 8 is connected with a large arc-shaped air outlet pipe 9, the air outlet pipe 9 is arranged just below the bottom hole 2 in front of the dam, and the air outlet pipe 9 is connected at equal intervals There are several exhaust holes 10, and finally the air is discharged through the exhaust holes 10 to generate air bubbles, here can refer to FIG. The exhaust hole 10 communicated with the cavity 11, the bottom wall of the ventilation riser 8 is provided with a through hole 12 that communicates with the air outlet cavity 11, please refer to FIG. 3 and FIG. 7 here.

The water level monitor 13 is arranged in the middle of the small arc dam body 5 and the large arc dam body 4 near the shore on the left and right sides of the arc-shaped waterscape dam, and the flow monitor 14 is arranged in front of the gate 3 on the bottom hole 2, here Referring to Fig. 1, Fig. 4 and Fig. 8, the landscaping fountain nozzles 15 are arranged at equal intervals on the crest of the large arc 4 of the arc-shaped waterscape dam, and Fig. 5 can be referred to here. The floating object collection area, where the garbage salvage device is connected to the side wall 21, including the wheel group 16, the water filter screen 17, the motor drive device drive device 18 and the receiver 19, the surface of the conveyor belt is the water filter screen 17, the conveyor pulley The group 16 is connected to an external motor drive device 18, a receiver 19 is installed on the side of the motor drive device, and a garbage collection box 20 is provided just below the top of the water filter screen of the conveyor belt. The gate 2 , the water level monitor 13 , the flow monitor 14 , the fountain nozzle 15 , the wheel set 16 , the motor drive device 18 and the receiver 19 are all electrically connected.

When the present invention is working, the opening degree of the gate 3 is adjusted, and the upstream water flows to the downstream through the bottom hole 2, so as to ensure that the water body has a certain fluidity, and the floating objects in the upstream are carried to a certain distance in front of the dam body 1 by the water flow, Under the diversion effect of the circular arc streamlines of the dam body 1 composed of large and small arcs 4 and 5, the floating objects are guided to the floating object retention area in the middle of the small arc 5 near the two banks. The suspended matter in the lower layer will also come to the front of the dam along with the water flow. By connecting an air pump, etc., air can be passed into the air intake pipe 6. The air intake pipe 6 directly leads to the air storage cavity 7, and the air storage cavity 7 can adjust the speed and uniformity of the air intake. After that, the other end of the air storage cavity 7 enters the ventilation riser 8, the ventilation riser 8 is adjusted through the through hole 12 and then reaches the air outlet cavity 11 of the air outlet pipe 9, and finally is discharged through the exhaust hole 10, resulting in The generated bubbles can migrate the suspended matter in the middle and lower layers to the water surface and drift along the arc, which can better prevent the suspended matter in the middle and lower layers from rushing to the downstream channel through the bottom hole 2, and can also promote the fluidity of the water body and increase the water body. dissolved oxygen content. When the floating objects gradually gather in the central area of the small arc 5, under the real-time monitoring of the water level monitor 13 and the flow monitor 14, the collection control command sent after the intelligent automatic analysis of the water level and flow data can be driven by the motor 18 The receiver 19 on the top receives, the conveyor belt at the bottom submerged below the water surface can adjust the transmission speed of the water filter 17 in harmony with the water conditions, the water filter 17 can reduce the water carried by the floating objects, and finally the floating objects pass through the conveyor belt fixing device Proceed to garbage collection box 20. The relevant water supply system can be controlled as required, and the fountain nozzles 15 on the top of the dam of the large arc 4 can be used to generate fountains of different shapes to create a waterscape.

[Example 2]

The present embodiment provides a method for designing an arc-shaped waterscape dam based on vortex drifting, the specific steps of which are as follows:

S1. Investigate engineering conditions for engineering site selection, including boundary conditions and initial conditions for river water depth, flow velocity, and river width

S2. Use the drawing software to scale and adjust the diameter ratio of the circular arc and the size of the circumference angle, and make a corresponding series of test models;

S3. Under certain boundary conditions, use fluid mechanics simulation software to select a fluid model according to the river flow state to simulate the vortex drifting situation that may occur within the general flow velocity range of the river, observe the flow velocity vector direction in the upstream near dam area and the floating object collection area, and analyze the resulting vortex size, vortex duration and stable position;

S4. According to the specific conditions of the project and according to the simulation results, the final dam body streamline design scheme is selected to make a physical model for experimental simulation, and the final dam type scheme is determined by the experimental results.

In the above-mentioned step S2, the drawing software such as AutoCAD and solidworks can be used as the drawing software, and the fluid mechanics simulation software such as fluent and flow3D can be used in the step S3.

Taking a small and medium-sized river channel as an example to illustrate the optimization process of the ratio of large and small arcs. The river flows through a township area with a width of 80m and an average annual depth of 0.8m. It is hoped that by constructing a barrage, the upper reaches of the river will be accumulated to a height of 1.2m to meet the production and living ecological water of the township people. The average annual flow rate of the river is 3m/s. The river reach of the project site is straight and straight and the terrain is flat, which can be approximated as an ideal straight rectangular river reach. First, the channel was reduced by 10 times and generalized to a test model of 108 × 80 cm. AutoCAD was used for three-dimensional drawing, and then the flow3D model was used to simulate the free surface fluid. The model is divided into 1cm square grids, and the simulation time is set to 100s. The turbulent flow model is calculated using the k-ε equation model of RNG. The upstream boundary velocity is 3cm/s, the boundary water depth is 12cm, and the outlet is free to flow. The initial water depth is 12cm, and the initial flow velocity 3cm/s, under this hydrodynamic condition, adjust the proportional relationship between the large arc and the small arc to simulate, and the radian vortex intensity can be compared through the 3D animation and 2D flow animation simulation process.

After testing, the ratio of the radius of the small circular arc dam body to the large circular arc dam body of the present invention should not be greater than 1/2 to generate a complete vortex. Four working conditions of dam body radius R: r10cm-R20cm, r8cm-R24cm, r6cm-R28cm, r4cm-R32cm, r/R ratios are 1/2, 1/3, 3/14, 1/8 respectively, discuss 2D Flow velocity vector result under floor plan. Now a horizontal plane with a vertical distance of 7.5cm from the bottom of the river bed is given. The flow velocity vector diagram of the horizontal plane under each working condition with the simulation time of 80s is shown in Figure 10-13. The x and y axes represent the river flow direction and the river width direction respectively. , the unit is mm, the gray scale bar indicates the flow velocity, the darker the color, the smaller the flow velocity, the unit is mm/s, and the arrow of the streamline in the figure indicates the flow velocity direction. It can be observed that, except for the working condition of r/R=1/8, vortices can be generated in all working conditions. The vortex in front of the dam on the left bank is clockwise, the vortex in front of the dam on the right bank is counterclockwise, and the streamline at the vortex is gray-black. , indicating that the flow velocity here is small, which is conducive to the accumulation of floating objects. When the dam width is constant, with the decrease of the r/R value, the vortex radius is smaller, and the vortex position is more stable at the center of the small arc.

At the same time, comparing the 2D flow velocity vector time series of each working condition, it is found that with the decrease of the r/R value, the vortex maintenance time is significantly shortened, the floating object gathering space is greatly reduced, and the large arc is more convex in the river flow direction. The requirements for stress tolerance are higher, and the sense of hierarchy in the landscape is weakened. Taking into account the efficiency of the collection efficiency of floating objects and the benefits of the vortex effect, the arc-shaped drift-guiding effect under the two conditions with the ratio of large and small arcs of r8cm-R24cm and r6cm-R28cm is better than the other two conditions. There are still more prominent problems of domestic garbage dumping in towns and villages. There are many floating objects in the river, and there is a large demand for salvaging the floating objects. The test model of r8cm-R24cm is the best, and the physical model can be made, and the simulated floating objects such as plastic balls can be used to Float collection rate optimized other details for metrics. This example is a simple optimal condition to illustrate. The specific engineering selection is based on setting the optimal conditions in combination with more practical engineering backgrounds, adjusting the r/R ratio to about 1/3, and further optimizing the proportional scheme.

[Example 3]

The air bubble generating component can be a steel pipe in sections such as the air inlet pipe 6, the air storage cavity 7, the ventilation standpipe 8, the air outlet pipe 9 and the exhaust hole 10 in the present invention, or it can be a soft material that communicates as one. For the pipeline, the required material can be selected according to the specific conditions of the river and the difficulty of construction. In addition, the exhaust holes are arranged at equal intervals on the air outlet pipe, and the exhaust method here can also be adjusted by adding the pipe to meet the conditions of rapid generation of a large number of air bubbles, and play a role in lifting the suspended matter in the middle and low layers. Can work.

[Example 4]

In terms of the design of salvage equipment, the present invention is provided with a water level monitor 13. Since the water levels of the river center and the two banks are different, the small arc near the bank and the large arc in the middle of the river are provided with this device, and the radians are different. , the flow velocity of the gates is different, so the flow monitors 14 are installed in front of the four gates 3. The monitored water level and flow information can approximately reflect the amount of floating objects carried by the upstream during this period of time. The signal is transmitted to the receiver 19 to adjust the wheel. The transmission speed of the group 16 is adjusted accordingly, and the transportation and processing cycle of the garbage collection box 20 is coordinated accordingly, so as to ensure that the floating objects can be salvaged, transported and processed in time, and the work efficiency of salvage is improved. In addition, the water filtering screen 17 has a mesh structure and has a certain spike structure, which can reduce the water flow carried by the garbage while ensuring that the garbage can be salvaged, and reduce the difficulty of garbage disposal.

The above embodiments are only used to illustrate and illustrate the present invention, and are not intended to limit the present invention to the scope of the described embodiments. In addition, those skilled in the art can understand that the present invention is not limited to the above-mentioned embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of protection of the present invention. .

Claims (8)

1. The utility model provides an arc waterscape dam based on swirl is led and is floated which characterized in that: comprises an arc dam body and a garbage fishing device;

the arc-shaped dam comprises a large arc dam body arranged in the middle and small arc dam bodies symmetrically arranged on two sides of the large arc dam body, the small arc dam body is tangent to the large arc dam body, side walls are arranged on two sides of the small arc dam body, the opening end of the small arc dam body is arranged towards the upstream, floating object collecting regions are arranged at positions, close to the dam bodies, of the left bank and the right bank, and a garbage salvaging device is arranged in the floating object collecting regions; the radius ratio of the small arc dam body to the large arc dam body is more than 1/8 and not more than 1/2; the dam comprises a dam body and is characterized in that a plurality of bottom holes are formed in the dam body, opening and closing of the bottom holes are controlled through spiral lifting gates, bubble generators are arranged on the peripheries of the bottom holes, air pumps are connected to the bubble generators along the joint of large and small circular arc arcs by pipelines surrounding the edges of the bottom holes, water level monitors are arranged at the near-shore positions and the middle parts of the left and right sides of the arc waterscape dam, flow monitors are arranged in front of the gates, and the water level monitors and the flow monitors are connected with sensors.

2. The vortex float guide based arc-shaped waterscape dam according to claim 1, wherein: the garbage fishing device comprises a wheel shaft and a water passing filter screen conveyor belt, wherein the wheel shaft and the water passing filter screen conveyor belt form a certain inclination angle with the horizontal plane, the bottom end of the conveyor belt submerges below the water surface of the collecting region, the top end of the conveyor belt is externally connected with a motor driving device, and a garbage collecting box is arranged under the conveyor belt.

3. The vortex floating guide based arc-shaped waterscape dam according to claim 1, wherein: the bubble generator specifically comprises an air inlet pipe, an air storage cavity, a ventilation vertical pipe, an air outlet pipe, a through hole and an exhaust hole, wherein the air outlet pipe is positioned under the bottom hole, the left end and the right end of the air outlet pipe are connected with the ventilation vertical pipe, air is conveyed by the through hole and then is discharged by the uniform exhaust hole to float upwards, the ventilation vertical pipe abuts against the joint of two circular arcs of the barrage and is directly communicated with the air storage cavity arranged at the top of the barrage, and the air storage cavity can be ventilated by an air pump externally connected with a bank through the air inlet pipe.

4. The vortex floating guide based arc-shaped waterscape dam according to claim 1, wherein: the water level monitors arranged at the river edge and the river center and the flow monitors arranged in front of the gate are fixed at the upstream face of the dam body in the form of an orthodrome.

5. The vortex floating guide based arc-shaped waterscape dam according to claim 2, wherein: the garbage salvaging device adjusts the working period according to the water level and flow information sent by the sensor, the conveying time of the garbage collecting box is correspondingly adjusted, and the surface of the conveyor belt is provided with a water passing filter screen with a nail-stabbing protruding structure so as to reduce the water content doped in the garbage and hook-grabbing floaters.

6. The vortex floating guide based arc-shaped waterscape dam according to claim 1, wherein: the arc-shaped waterscape dam is characterized in that landscaping fountain nozzles are arranged at the top of the large arc-shaped dam at equal intervals, a converter is arranged in each fountain nozzle, the fountain nozzles are directionally sprayed to the downstream, and different fountain landscapes can be constructed by changing the spraying mode according to the flow.

7. The vortex float guide based arc-shaped waterscape dam according to claim 6, wherein: the fountain spray head is connected with a corresponding water pumping system, fountain lamps are distributed around the fountain spray head, and the fountain lamps are matched with the bottom holes to symmetrically discharge water.

8. The method for designing the arc-shaped waterscape dam based on the vortex drifting according to any one of claims 1 to 7, which is characterized by comprising the following specific steps:

s1, surveying engineering conditions of engineering site selection, including boundary conditions and initial conditions of river water depth, flow velocity and river width;

s2, scaling and adjusting the diameter proportion and the circumferential angle of the circular arc by using drawing software in an equal proportion to manufacture a corresponding series of test models;

s3, simulating a vortex drifting condition possibly generated in a general flow velocity range of the river by using a fluid model according to the flow state of the river by using fluid mechanics simulation software under the condition of determining a boundary, observing the flow velocity vector directions of an upstream dam-approaching region and a floater collecting region, and analyzing the generated vortex size, vortex duration and stable position;

and S4, determining a final dam body streamline design scheme according to the simulation result by combining the concrete conditions of the engineering to manufacture a physical model for experimental simulation, and determining a final dam type scheme according to the experimental result.

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