A low-level buffer tank adjustment system and working method thereof

Abstract

The invention discloses a low-position buffer pool regulating system and a working method thereof, comprising a low-position buffer pool, a tidal river section movable dam and an outer river movable dam. The low-position buffer pool is arranged between the tidal river section and the outer river. The pool bottom elevation of the low-position buffer pool is lower than the pool bottom elevation of the tidal river section, so that the water flow in the tidal river section can be downwardly collected into the low-position buffer pool under the action of gravity. The maximum width of the low-position buffer pool is greater than the width of the tidal river section, and the low-position buffer pool has a certain capacity, so that the low-position buffer pool can retain part of the water volume to achieve a buffering function. The tidal river section movable dam is arranged between the low-position buffer pool and the tidal river section, and the outer river movable dam is arranged between the low-position buffer pool and the outer river. Both the tidal river section movable dam and the outer river movable dam are lifting dams. The invention has a simple structure and is convenient to operate. It only needs to adjust the tidal river section movable dam and the outer river movable dam at a specific time point to regulate the interaction between the tidal river channel and the outer river.

Description

Technical Field

[0001] The invention belongs to the technical field of river regulation, and in particular relates to a low-position buffer tank regulation system and a working method thereof. Background Art

[0002] Most of the tidal river sections in my country's coastal areas are located in alluvial plains, with slow flow rates and poor fluidity due to the support of seawater. This easily causes sewage to be retained and a large amount of organic matter to be deposited on the riverbed for anaerobic fermentation. Due to tidal oscillations into the river, pollutants in the sedimentary sediments of the river channel are frequently and repeatedly disturbed and re-enter the water body, which in turn exacerbates the black and smelly river channels. Due to the influence of tides, the water level of tidal river sections fluctuates frequently and with a large amplitude. Some river sections may be too shallow at low tide, and even large areas of riverbed may be exposed, which seriously affects the survival of aquatic plants. Due to the frequent exchange of water bodies in tidal river sections, the water flow rate is high during the rise and fall of tides, and the water flow has strong scouring properties, which has a very adverse effect on the recovery of aquatic plant systems. In addition, most estuaries are equipped with gate control systems, but due to unreasonable opening and closing, the black and smelly problem of tidal river sections is further aggravated.

[0003] In the current comprehensive treatment plan for tidal black and smelly river sections, external control measures such as sewage interception and internal control measures such as sediment dredging are often adopted, and gates and pump stations are combined to utilize the hydraulic process of tidal action to achieve the purpose of maintaining the water level of tidal river sections, increasing the flow rate, and changing reciprocating flow to unidirectional flow. Existing technical means usually have relatively single functions, requiring gates and pumps to run for a long time and consume a lot of energy. At the same time, they will cut off the hydraulic and ecological connection between tidal river sections and external rivers for a long time, blocking the channel for the movement of aquatic organisms. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a low-level buffer tank regulation system and a working method thereof, which are arranged at the junction of a tidal river section and an outer river. The bottom elevation of the low-level buffer tank is lower than that of the tidal river section, and a certain capacity is reserved for storing part of the water, so that it can serve as a buffer and regulation facility between the tidal river and the outer river.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A low-level buffer tank regulation system comprises a low-level buffer tank, a tidal river section movable dam and an outer river movable dam, wherein the low-level buffer tank is arranged between the tidal river section and the outer river, the water flow of the tidal river section passes through the low-level buffer tank and enters the outer river, the bottom elevation of the low-level buffer tank is lower than the bottom elevation of the tidal river section, so that the water flow in the tidal river section can be downwardly gathered into the low-level buffer tank under the action of gravity, the maximum width of the low-level buffer tank is greater than the width of the tidal river section, and the low-level buffer tank has a certain capacity, so that the low-level buffer tank can retain water and realize a buffering function, the tidal river section movable dam is arranged between the low-level buffer tank and the tidal river section, the outer river movable dam is arranged between the low-level buffer tank and the outer river, and both the tidal river section movable dam and the outer river movable dam are lifting dams.

[0007] Furthermore, the tidal river section movable dam includes a tidal river section dam body and a first pushing rod, one end of the first pushing rod is fixed to the bottom of the low-level buffer pool, and the other end is fixed to the tidal river section dam body, and the tidal river section dam body is driven to rise and fall by the first pushing rod.

[0008] Furthermore, the outer river movable dam includes an outer river dam body and a second pushing rod, one end of the second pushing rod is fixed to the bottom of the low-position buffer tank, and the other end is fixed to the outer river dam body, and the outer river dam body is driven to rise and fall by the second pushing rod.

[0009] Furthermore, the first pushing rod is a hydraulic rod, and the second pushing rod is a hydraulic rod.

[0010] Furthermore, the tidal river channel is located in an alluvial plain, with a small river channel gradient and slow water flow.

[0011] A working method of a low-level buffer pool regulating system, applied to any of the above-mentioned low-level buffer pool regulating systems, comprising:

[0012] Step 1: The movable dam in the tidal river section is lowered to a fully open state, and the low-level buffer tank regulation system maintains a unidirectional flow state in the tidal river section by raising and lowering the movable dam in the outer river;

[0013] Step 2: lower the height of the outer river movable dam from the dam top elevation H1 to the fully open state, the movable dam in the tidal river section is fully raised, and the low-level buffer tank regulation system flushes and silts the tidal river section.

[0014] The step 1 specifically includes:

[0015] Step 101, the movable dam in the tidal river section is kept in a fully open state. When the water level of the outer river rises to the high tide level and the tide begins to recede, when the water level of the outer river drops to the level of the outer river and the low-level buffer pool, the height of the outer river movable dam drops to the dam top elevation H1. As the tide of the outer river continues to recede, the water level gradually decreases. The water flow in the low-level buffer pool and the tidal river section is affected by the tidal effect. The water flows from the tidal river section through the low-level buffer pool, over the outer river movable dam and merges into the outer river. The water flow in the tidal river section flows downstream in one direction. At the same time, the existence of the outer river movable dam can enable the low-level buffer pool to store a certain amount of water, form a top support for the water body in the tidal river section, and reduce the flow rate at low tide.

[0016] Step 102: As the tide continues to recede, when the water level of the outer river drops below the dam crest elevation H1 of the outer river movable dam, the water level of the outer river continues to drop, and the water level of the tidal river section remains at the lowest water level Z1 of the tidal river section. As the tidal river section continues to flow into the low-level buffer pool, the water flow in the low-level buffer pool forms an overflow at the dam crest of the outer river movable dam.

[0017] Step 103, when the water level of the outer river drops to the low tide level and starts to rise, the height of the outer river movable dam remains unchanged at the dam crest elevation H1, and the low-level buffer pool is still in an overflow state. When the water level of the outer river rises to the dam crest elevation H1 at this time, the outer river movable dam is fully raised to cut off the hydraulic connection between the low-level buffer pool and the outer river. At this time, the low-level buffer pool is in a low water level state, leaving enough capacity to accept the water volume flowing into the tidal river section during the rising tide of the outer river. The water flow of the tidal river section will continue to flow into the low-level buffer pool during the rising tide of the outer river, and the water flow of the tidal river section still flows unidirectionally downstream;

[0018] Step 104: After the water level of the outer river rises to the high tide level and begins to recede, steps 101 to 103 are repeated.

[0019] In the step 2, when the outer river is at a low tide and begins to rise, the height of the outer river movable dam is lowered from the dam top elevation H1 to a fully open state, the movable dam of the tidal river section is fully raised, and the hydraulic connection between the tidal river section and the low-level buffer pool is cut off. As the water level of the outer river gradually rises to the high tide level, the low-level buffer pool also gradually rises to the highest water level. In this process, due to the difference between the rising tide speed of the outer river and the convergence speed of the water flow in the tidal river section, a water level difference will be formed between the tidal river section and the low-level buffer pool. When the water level of the low-level buffer pool is higher than that of the tidal river section and the water level difference reaches the maximum, the movable dam of the tidal river section is completely lowered, and the water stored in the low-level buffer pool is used to flush the connecting section, rolling up some of the deposited pollutants. After the flushing and silting is completed, the pollutants are gradually transferred to the low-level buffer pool as the tide recedes.

[0020] The dam crest elevation H1 is the minimum height that the outer river movable dam needs to maintain when forming a one-way flow. Below the dam crest elevation H1, the low-level buffer tank of the outer river movable dam can store part of the water to form a top support for the water body of the tidal river section to ensure that the lowest water level Z1 of the tidal river section is higher than the lowest suitable water level of the river section, and there will be no situation where the water level is too low and a large area of ​​the riverbed is exposed.

[0021] Furthermore, the dam crest elevation of the outer river movable dam when fully raised should be greater than the outer river high tide level; the dam crest elevation of the tidal river section movable dam when fully raised should be greater than the highest water level of the tidal river section and the highest water level of the low-level buffer pool.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0023] (1) The low-level buffer tank adjustment system and working method provided by the present invention have a simple structure and are easy to operate. It is only necessary to adjust the height of the movable dam at a specific time point. No high-energy consumption facilities such as pumping stations are set up, and the energy consumption is relatively low.

[0024] (2) The low-level buffer tank regulation system and its working method provided by the present invention have flexible and diverse working modes. In addition to the aforementioned functions of buffering, flow regulation, silting and stabilizing the minimum water level, they can also play a certain role in tidal river management projects. For example, they can prevent the backflow of water from the outer river during river dredging. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The illustrative 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:

[0026] Figure 1 is a schematic side view of an embodiment of the present invention;

[0027] Figure 2 is a schematic top view of an embodiment of the present invention;

[0028] Figure 3 Schematic diagram of water level when the outer river water level is at high tide in an embodiment of the present invention;

[0029] Figure 4 It is a schematic diagram of the water level height when the outer river water level is at a low tide level according to an embodiment of the present invention.

[0030] Among them, 1. Low-level buffer pool; 2. Movable dam in tidal river section; 3. Movable dam in outer river; 4. Tidal river section; 5. Outer river. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present 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, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0033] The present invention provides a low buffer pool adjustment system, such as Figure 1 and Figure 2 As shown, it includes a low-level buffer tank 1, a tidal river section movable dam 2 and an outer river movable dam 3. The low-level buffer tank 1 is arranged between the tidal river section 4 and the outer river 5. The water flow of the tidal river section 4 enters the outer river 5 through the low-level buffer tank 1. The bottom elevation of the low-level buffer tank 1 is lower than the bottom elevation of the tidal river section 4, so that the water flow in the tidal river section 4 can be downwardly gathered into the low-level buffer tank 1 under the action of gravity. The maximum width of the low-level buffer tank 1 is greater than the width of the tidal river section 4, and the low-level buffer tank 1 has a certain capacity, so that the low-level buffer tank 1 can retain part of the water to achieve a buffering function. The tidal river section movable dam 2 is arranged between the low-level buffer tank 1 and the tidal river section 4, and the outer river movable dam 3 is arranged between the low-level buffer tank 1 and the outer river 5. The tidal river section movable dam 2 and the outer river movable dam 3 are both lifting dams.

[0034] The present invention provides a low-level buffer tank 1 regulation system, which has a simple structure and is easy to operate. The low-level buffer tank 1 regulation system is arranged at the connection point between a tidal river section 4 and an outer river 5, and comprises a low-level buffer tank 1, a tidal river section movable dam 2 and an outer river movable dam 3. The tidal river section movable dam 2 is arranged between the low-level buffer tank 1 and the tidal river section 4, and the outer river movable dam 3 is arranged between the low-level buffer tank 1 and the outer river 5. The bottom elevation of the low-level buffer tank 1 is lower than that of the tidal river section 4, and a certain capacity is reserved for storing part of the water. The low-level buffer tank 1 regulation system can be used as a buffer and control facility between the tidal river channel and the outer river 5.

[0035] The present invention sets the tidal river section movable dam 2 and the outer river movable dam 3 as lifting dams, and achieves the functions of maintaining a unidirectional flow state between the tidal river channel and the outer river 5, scouring and silting of the connecting section, buffering, stabilizing the minimum water level, etc. through the lifting and lowering of the tidal river section movable dam 2 and the outer river movable dam 3.

[0036] In the present invention, the water flow of the tidal river section 4 is only exchanged with the water in the low-level buffer pool 1, and does not directly enter the outer river 5; at the same time, the outer river 5 only exchanges water with the low-level buffer pool 1, and is not directly connected with the tidal river section 4. The tidal river section 4 and the outer river 5 are separated to avoid direct water exchange between the tidal river section 4 and the outer river 5, which causes the tidal river section 4 to be directly affected by the tidal effect, the water level and water flow direction of the tidal river section 4 to change dramatically, the water flow is reciprocating, and the water body is repeatedly disturbed.

[0037] In the present invention, in order to realize the lifting and lowering of the tidal river section movable dam 2 and the outer river movable dam 3, the tidal river section movable dam 2 includes a tidal river section dam body and a first pushing rod, one end of the first pushing rod is fixed to the bottom of the low-level buffer tank 1, and the other end is fixed to the tidal river section dam body, and the tidal river section dam body is driven to be lifted and lowered by the first pushing rod.

[0038] The outer river movable dam 3 includes an outer river dam body and a second push rod, one end of the second push rod is fixed to the bottom of the low-level buffer tank 1, and the other end is fixed to the outer river dam body, and the outer river dam body is driven to rise and fall by the second push rod.

[0039] Specifically, the first pushing rod is a hydraulic rod, and the second pushing rod is a hydraulic rod.

[0040] In the present invention, the tidal river section movable dam 2 is arranged at the connection between the tidal river section 4 and the low-level buffer pool 1. The height of the tidal river section movable dam 2 can be raised and lowered. When the tidal river section movable dam 2 is raised to the highest position, the hydraulic connection between the tidal river section 4 and the low-level buffer pool 1 can be completely cut off. When the tidal river section movable dam 2 is lowered to the lowest position, it is in a fully open state.

[0041] In the present invention, the outer river movable dam 3 is arranged at the connection between the outer river 5 and the low-level buffer tank 1. The height of the outer river movable dam 3 can be raised and lowered. When the outer river movable dam 3 is raised to the highest point, the hydraulic connection between the outer river 5 and the low-level buffer tank 1 can be completely cut off. When the outer river movable dam 3 is lowered to the lowest point, it is in a fully open state.

[0042] In the present invention, the low-level buffer pool 1 can store a certain amount of water, which can buffer the changes in water level and flow rate of the tidal river section 4 caused by the tidal action of the outer river 5, and can adjust the movable dam by adjusting the lifting and lowering of the movable dam in accordance with the law of tidal action, so as to change the reciprocating flow state of the tidal river channel into a unidirectional flow state, and at the same time stabilize the lowest water level of the tidal river section 4, and improve the fluidity and self-purification capacity of the tidal river channel. The low-level buffer pool 1 has a wide water surface, and the flow rate of the water flow of the tidal river section 4 decreases after entering the low-level buffer pool 1. The low-level buffer pool 1 can play the role of slowing down the flow, promoting siltation, settling and retaining pollutants, and can adjust the lifting and lowering of the movable dam by adjusting the lifting and lowering of the movable dam in accordance with the law of tidal action, flushing and silting the tidal river section 4, and improving the siltation problem at the estuary of the tidal river section 4. The low-level buffer tank 1 regulation system does not completely cut off the connection between the tidal river section 4 and the outer river 5. The low-level buffer tank 1 can provide a long-term or temporary biological habitat for aquatic organisms in the tidal river section 4 and the river estuary, thereby protecting the continuity of the habitat at the estuary to a certain extent.

[0043] In the present invention, the tidal river channel is located in an alluvial plain, the river channel has a small gradient and a slow water flow.

[0044] The present invention also provides a working method of a low-level buffer pool regulating system, comprising:

[0045] Step 1: The movable dam 2 of the tidal river section is lowered to a fully open state, and the regulating system of the low-level buffer pool 1 maintains a unidirectional flow state in the tidal river section 4 by raising and lowering the movable dam 3 of the outer river;

[0046] Step 2: lower the height of the outer river movable dam 3 from the dam top elevation H1 to the fully open state, the tidal river section movable dam 2 is fully raised, and the low-level buffer tank 1 adjustment system scours and silts the tidal river section 4.

[0047] like Figure 3 and Figure 4 As shown, the step 1 specifically includes:

[0048] Step 101, the movable dam 2 of the tidal river section is kept in a fully open state. When the water level of the outer river 5 rises to the high tide level and the tide begins to recede, when the water level of the outer river 5 drops to the level of the water level of the outer river 5 and the water level of the low-level buffer pool 1, the height of the outer river movable dam 3 drops to the dam top elevation H1. As the outer river 5 continues to recede, the water level gradually decreases. The water flow in the low-level buffer pool 1 and the tidal river section 4 is affected by the tidal effect. The water flows from the tidal river section 4 through the low-level buffer pool 1, over the outer river movable dam 3 and merges into the outer river 5. The water flow in the tidal river section 4 flows downstream in one direction. At the same time, the existence of the outer river movable dam 3 can enable the low-level buffer pool 1 to store a certain amount of water, thereby forming a top support for the water body of the tidal river section 4 and reducing the flow rate at low tide.

[0049] Step 102: As the tide continues to recede, when the water level of the outer river 5 drops below the dam crest elevation H1 of the outer river movable dam 3, the water level of the outer river 5 continues to drop, and the water level of the tidal river section 4 remains at the lowest water level Z1 of the tidal river section 4. As the tidal river section 4 continues to flow into the low-level buffer pool 1, the water flow in the low-level buffer pool 1 forms an overflow at the dam crest of the outer river movable dam 3;

[0050] Step 103, when the water level of the outer river 5 drops to the low tide level and starts to rise, the height of the outer river movable dam 3 remains unchanged at the dam top elevation H1, and the low-level buffer pool 1 is still in an overflow state. When the water level of the outer river 5 rises to the dam top elevation H1 at this time, the outer river movable dam 3 is fully raised to cut off the hydraulic connection between the low-level buffer pool 1 and the outer river 5. At this time, the low-level buffer pool 1 is in a low water level state, leaving enough capacity to receive the water volume of the tidal river section 4 during the rising tide of the outer river 5. The water flow of the tidal river section 4 will continue to flow into the low-level buffer pool 1 during the rising tide of the outer river 5, and the water flow of the tidal river section 4 still flows unidirectionally downstream;

[0051] Step 104: After the water level of the outer river 5 rises to the high tide level and the tide begins to recede, steps 101 to 103 are repeated.

[0052] Through steps 101 to 104, the reciprocating flow between the tidal river section and the outer river under the influence of tide is changed into a unidirectional flow in the tidal river section, thereby realizing flow regulation.

[0053] Tidal river channels are generally located in alluvial plains, with a small gradient and slow water flow. After the system has been running for a long time, siltation is likely to form in the connection section between the tidal river channel and the low-level buffer pool 1, and periodic siltation work is required to prevent blockage of the river channel. In the present invention, in step 2, in order to flush and silt the tidal river section 4, when the outer river 5 is at a low tide and begins to rise, the height of the outer river movable dam 3 is lowered from the dam top elevation H1 to a fully open state, and the tidal river section movable dam 2 is fully raised, cutting off the hydraulic connection between the tidal river section 4 and the low-level buffer tank 1. As the water level of the outer river 5 gradually rises to a high tide level, the low-level buffer tank 1 also gradually rises to a maximum water level. In this process, due to the difference between the rising tide speed of the outer river 5 and the water flow convergence speed of the tidal river section 4, a water level difference will be formed between the tidal river section 4 and the low-level buffer tank 1. When the water level of the low-level buffer tank 1 is higher than that of the tidal river section 4 and the water level difference reaches a maximum, the tidal river section movable dam 2 is completely lowered, and the water stored in the low-level buffer tank 1 is used to flush the connecting section, rolling up some of the deposited pollutants. After the flushing and silting is completed, the pollutants are gradually transferred to the low-level buffer tank 1 as the tide recedes.

[0054] During the dredging of the tidal river, since the movable dam 2 of the tidal river section is fully raised, the low-level buffer tank 1 regulating system provided by the present invention can prevent the backflow of water from the outer river 5.

[0055] The dam top elevation H1 is the minimum height that the outer river movable dam 3 needs to maintain when forming a one-way flow. The outer river movable dam 3 is below the dam top elevation H1, and the low-level buffer tank 1 can store part of the water to form a top support for the water body of the tidal river section 4 to ensure that the lowest water level Z1 of the tidal river section 4 is higher than the lowest suitable water level of the river section, and there will be no situation where the water level is too low and the riverbed is exposed in a large area, which is convenient for stabilizing the lowest water level and biological habitat.

[0056] The dam crest elevation of the outer river movable dam 3 when fully raised should be greater than the high tide level of the outer river 5; the dam crest elevation of the tidal river section movable dam 2 when fully raised should be greater than the highest water level of the tidal river section 4 and the highest water level of the low-level buffer pool 1.

[0057] In summary, the low-level buffer tank adjustment system provided by the present invention has a simple structure and is easy to operate. It only needs to adjust the height of the movable dam at a specific time point. No high-energy consumption facilities such as pumping stations are set up, and the energy consumption is low.

[0058] The low-level buffer tank regulation system provided by the present invention has flexible and diverse working modes. In addition to the aforementioned functions of buffering, flow regulation, scouring and silting, stabilizing the minimum water level, and providing biological habitat, it can also play a certain role in tidal river management projects.

[0059] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A low-level buffer tank adjustment system, characterized in that: It includes a low-level buffer pool, a movable dam for a tidal river section and a movable dam for an outer river. The low-level buffer pool is arranged between the tidal river section and the outer river. The water flow in the tidal river section passes through the low-level buffer pool and enters the outer river. The bottom elevation of the low-level buffer pool is lower than the bottom elevation of the tidal river section, so that the water flow in the tidal river section can be downwardly gathered into the low-level buffer pool under the action of gravity. The maximum width of the low-level buffer pool is greater than the width of the tidal river section, and the low-level buffer pool has a certain capacity, so that the low-level buffer pool can retain water and realize a buffering function. The movable dam for the tidal river section is arranged between the low-level buffer pool and the tidal river section, and the movable dam for the outer river is arranged between the low-level buffer pool and the outer river. Both the movable dam for the tidal river section and the movable dam for the outer river are lifting dams.

2. The low-level buffer tank adjustment system according to claim 1 is characterized in that: The movable dam of the tidal river section comprises a tidal river section dam body and a first pushing rod, one end of the first pushing rod is fixed to the bottom of the low-position buffer pool, and the other end is fixed to the tidal river section dam body, and the tidal river section dam body is driven to rise and fall by the first pushing rod.

3. The low-level buffer tank adjustment system according to claim 2 is characterized in that: The outer river movable dam comprises an outer river dam body and a second push rod, one end of the second push rod is fixed to the bottom of the low-position buffer tank, and the other end is fixed to the outer river dam body, and the outer river dam body is driven to rise and fall by the second push rod.

4. The low-level buffer tank adjustment system according to claim 3 is characterized in that: The first push rod is a hydraulic rod, and the second push rod is a hydraulic rod.

5. The low-level buffer tank adjustment system according to claim 1 is characterized in that: The tidal river section is located in an alluvial plain, with a small river gradient and slow water flow.

6. A working method of a low-level buffer pool regulating system, applied to the low-level buffer pool regulating system according to any one of claims 1 to 5, characterized in that: include: Step 1: The movable dam in the tidal river section is lowered to a fully open state, and the low-level buffer tank regulation system maintains a unidirectional flow state in the tidal river section by raising and lowering the movable dam in the outer river; Step 2: lower the height of the outer river movable dam from the dam top elevation H1 to the fully open state, and fully raise the movable dam in the tidal river section. The low-level buffer tank regulation system scours and silts the tidal river section. The dam top elevation H1 is the minimum height that the outer river movable dam needs to maintain when forming a one-way flow.

7. The working method of the low-level buffer tank regulation system according to claim 6, characterized in that: The step 1 specifically includes: Step 101, the movable dam in the tidal river section is kept in a fully open state. When the water level of the outer river rises to the high tide level and the tide begins to recede, when the water level of the outer river drops to the level of the outer river and the low-level buffer pool, the height of the outer river movable dam drops to the dam top elevation H1. As the tide of the outer river continues to recede, the water level gradually decreases. The water flow in the low-level buffer pool and the tidal river section is affected by the tidal effect. The water flows from the tidal river section through the low-level buffer pool, over the outer river movable dam and merges into the outer river. The water flow in the tidal river section flows downstream in one direction. At the same time, the existence of the outer river movable dam can enable the low-level buffer pool to store a certain amount of water, form a top support for the water body in the tidal river section, and reduce the flow rate at low tide. Step 102: As the tide continues to recede, when the water level of the outer river drops below the dam crest elevation H1 of the outer river movable dam, the water level of the outer river continues to drop, and the water level of the tidal river section remains at the lowest water level Z1 of the tidal river section. As the tidal river section continues to flow into the low-level buffer pool, the water flow in the low-level buffer pool forms an overflow at the dam crest of the outer river movable dam. Step 103, when the water level of the outer river drops to the low tide level and starts to rise, the height of the outer river movable dam remains unchanged at the dam crest elevation H1, and the low-level buffer pool is still in an overflow state. When the water level of the outer river rises to the dam crest elevation H1 at this time, the outer river movable dam is fully raised to cut off the hydraulic connection between the low-level buffer pool and the outer river. At this time, the low-level buffer pool is in a low water level state, leaving enough capacity to accept the water volume flowing into the tidal river section during the rising tide of the outer river. The water flow of the tidal river section will continue to flow into the low-level buffer pool during the rising tide of the outer river, and the water flow of the tidal river section still flows unidirectionally downstream; Step 104: After the water level of the outer river rises to the high tide level and begins to recede, steps 101 to 103 are repeated.

8. The working method of the low-level buffer tank regulating system according to claim 6, characterized in that: In the step 2, when the outer river is at a low tide and begins to rise, the height of the outer river movable dam is lowered from the dam top elevation H1 to a fully open state, the movable dam of the tidal river section is fully raised, and the hydraulic connection between the tidal river section and the low-level buffer pool is cut off. As the water level of the outer river gradually rises to the high tide level, the low-level buffer pool also gradually rises to the highest water level. In this process, due to the difference between the rising tide speed of the outer river and the convergence speed of the water flow in the tidal river section, a water level difference will be formed between the tidal river section and the low-level buffer pool. When the water level of the low-level buffer pool is higher than that of the tidal river section and the water level difference reaches the maximum, the movable dam of the tidal river section is completely lowered, and the water stored in the low-level buffer pool is used to flush the connecting section, rolling up some of the deposited pollutants. After the flushing and silting is completed, the pollutants are gradually transferred to the low-level buffer pool as the tide recedes.

9. The working method of the low-level buffer tank regulating system according to claim 6, characterized in that: The outer river movable dam is below the dam top elevation H1, and the low-level buffer tank can store part of the water to form a top support for the water body of the tidal river section to ensure that the lowest water level Z1 of the tidal river section is higher than the lowest suitable water level of the river section, and there will be no situation where the water level is too low and a large area of ​​the riverbed is exposed.

10. The working method of the low-level buffer tank adjustment system according to claim 6, characterized in that: The dam crest elevation of the outer river movable dam when fully raised should be greater than the outer river high tide level; the dam crest elevation of the tidal river section movable dam when fully raised should be greater than the highest water level of the tidal river section and the highest water level of the low-level buffer pool.

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