Hydropower station layered water taking system

Abstract

The invention discloses a layered water taking system for a hydropower station, and relates to the technical field of water conservancy projects. The layered water taking system of the hydropower station comprises a dam body, a first retaining wall and a second retaining wall, the dam body is provided with a water inlet, the first retaining wall and the second retaining wall are arranged on the dam body in a step shape corresponding to the water inlet, and the section of the first retaining wall and the section of the second retaining wall are in a U shape. A first channel through which a water supply body passes is limited between the first retaining wall and the dam body, the first retaining wall is provided with a first gate which can be opened and closed corresponding to the second retaining wall, a second channel is limited between the second retaining wall and the first retaining wall, and the second channel is used for being communicated with the first channel through the first gate. According to the layered water taking system for the hydropower station, rapid adjustment can be achieved when the height of the water level changes so that the water taking depth of surface water can be adjusted in a self-adaptive mode along with the variable amplitude of the water level, the influence on the flow field and the flow state of a water body is small, and the power generation benefits of the hydropower station are ensured.

Description

Technical Field

[0001] This invention relates to the field of water conservancy engineering technology, specifically to a stratified water intake system for a hydropower station. Background Technology

[0002] Large and medium-sized hydropower projects with high dams and large reservoirs have large reservoir capacities and deep water, which alters the spatial and temporal distribution of the original natural river water temperature. The reservoir water temperature generally exhibits vertical temperature stratification, with significant differences between the surface and bottom temperatures. Furthermore, the water intake of the diversion and power generation system typically uses deep holes for water intake, resulting in significant differences in the temperature of the discharged water compared to the natural river water at certain times. This differentially temperatured discharge can have adverse effects on the downstream ecological environment.

[0003] Hydropower projects mitigate the problem of discharging water with varying temperatures by implementing tiered water intake measures to control the water intake elevation of power stations. Currently, large and medium-sized hydropower projects both domestically and internationally employ measures such as enclosure-type (e.g., stacked beam gates, front retaining walls) and river-blocking-type (e.g., water-tight curtain walls). However, these measures present numerous challenges in implementation. For instance, stacked beam gates are constructed within the intake gate slot. Each ecological scheduling operation requires opening and closing the gates layer by layer according to downstream water temperature demands. These gates are typically operated using gantry cranes, resulting in a large number of gates that must be lowered one layer at a time, leading to excessive time consumption and cumbersome operation. Furthermore, the close distance between the gates and the intake affects the water flow field and flow pattern, making it unsuitable for high water levels and resulting in poor water temperature recovery. Water-tight curtain walls, constructed hundreds of meters upstream of the intake, are large-span, impermeable, flexible river-blocking structures. These present challenges such as significant construction difficulties, substantial investment, and disruption to flood discharge. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] To address this, this invention proposes a stratified water intake system for hydropower stations. This system can rapidly adjust to changes in water level, enabling adaptive adjustment of the surface water intake depth based on water level fluctuations. Furthermore, it has minimal impact on the flow field and flow regime of the water body, thus ensuring the power generation efficiency of the hydropower station.

[0006] The hydropower station stratified water intake system of this invention includes:

[0007] The dam body has an inlet; The first retaining wall and the second retaining wall are arranged in a stepped shape on the dam body corresponding to the water inlet. The second retaining wall is arranged on the side of the first retaining wall away from the dam body, and the height dimension of the second retaining wall is smaller than that of the first retaining wall. The cross-sections of the first retaining wall and the second retaining wall are in an "L" shape. A first channel for the water supply body to pass through is restricted between the first retaining wall and the dam body. The first retaining wall is provided with an openable and closable first sluice corresponding to the second retaining wall. A second channel is restricted between the second retaining wall and the first retaining wall, and the second channel is used to communicate with the first channel through the first sluice.

[0008] The stratified water intake system of the hydropower station in the embodiment of the present invention can be quickly adjusted when the water level height changes, so as to adaptively adjust the surface water intake depth with the water level amplitude change, and has little influence on the flow field and flow state of the water body, ensuring the power generation benefit of the hydropower station.

[0009] In some embodiments, it includes a deflector. The deflector is arranged on the side of the second retaining wall away from the first retaining wall, and a guide surface is inclined on the side of the deflector away from the second retaining wall.

[0010] In some embodiments, the guide surface is an arc surface. The central angle corresponding to the cross-section of the arc surface is not greater than 90°, and the diameter dimension of the circle corresponding to the cross-section of the arc surface is not less than the height dimension of the deflector.

[0011] In some embodiments, the height of the deflector is not less than the height of the second retaining wall.

[0012] In some embodiments, it includes a third retaining wall. The third retaining wall is arranged between the first retaining wall and the second retaining wall. The height dimension of the third retaining wall is greater than the height dimension of the second retaining wall and less than the height dimension of the first retaining wall. The third retaining wall is provided with an openable and closable second sluice corresponding to the first retaining wall and the second retaining wall. A third channel is restricted between the third retaining wall and the first retaining wall. The second channel is restricted between the second retaining wall and the third retaining wall. The third channel is used to communicate with the first channel through the first sluice. The second channel is used to communicate with the first channel through the first sluice and the second sluice.

[0013] In some embodiments, there are at least two third retaining walls. The height dimensions of the multiple third retaining walls increase in the direction close to the dam body. A fourth channel is restricted between two adjacent third retaining walls. The fourth channel is used to communicate with the first channel through the first sluice and the second sluice.

[0014] In some embodiments, a first baffle is included, the first baffle being disposed corresponding to the first gate, the first baffle having a first position and a second position, in the first position, the first baffle blocking the first gate to close the first gate, and in the second position, a predetermined distance existing between the first baffle and the first gate to open the first gate.

[0015] In some embodiments, the first baffle has a cavity and is provided with a water supply pipe communicating with the cavity, the water supply pipe being used to supply water to the cavity or extract water from the cavity.

[0016] In some embodiments, the first baffle is provided with a gas supply pipe communicating with the cavity, the gas supply pipe being located on the side of the water supply pipe away from the riverbed, and the gas supply pipe being provided with a one-way valve for discharging gas or water from the cavity.

[0017] In some embodiments, the first retaining wall includes a first supporting wall segment disposed corresponding to the dam body, wherein the side of the first supporting wall segment facing away from the dam body is inclined and the horizontal distance between the first supporting wall segment and the dam body increases in the direction close to the riverbed.

[0018] In some embodiments, the first support wall segment is inclined on the side near the dam body and the horizontal distance between it and the dam body decreases in the direction close to the riverbed.

[0019] In some embodiments, the second retaining wall includes a second supporting wall segment corresponding to the dam body, wherein the side of the second supporting wall segment closest to the dam body is inclined and the horizontal distance between the second supporting wall segment and the dam body decreases in the direction close to the riverbed. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a hydropower station stratified water intake system according to an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the structure of the first baffle in the hydropower station stratified water intake system according to an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the structure of a hydropower station stratified water intake system according to another embodiment of the present invention.

[0023] Figure label: Dam body 1; Inlet 11; First retaining wall 2; First gate 21; First baffle 22; Cavity 221; Water supply pipe 222; Gas supply pipe 223; One-way valve 224; First supporting wall section 23; Second retaining wall 3; Second supporting wall section 31; Guide fluid 4; Guide surface 41; The third retaining wall 5; the second sluice 51. Detailed implementation manners

[0024] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0025] As Figure 1 and Figure 3 shown, the stratified water intake system of the hydropower station in the embodiment of the present invention includes a dam body 1, a first retaining wall 2 and a second retaining wall 3. The dam body 1 has a water inlet 11. The first retaining wall 2 and the second retaining wall 3 are arranged in a stepped shape corresponding to the water inlet 11 on the dam body 1. The second retaining wall 3 is arranged on the side of the first retaining wall 2 away from the dam body 1, and the height dimension of the second retaining wall 3 is smaller than the height dimension of the second retaining wall 3. The cross sections of the first retaining wall 2 and the second retaining wall 3 are in an "L" shape. A first channel for the water supply body to pass through is restricted between the first retaining wall 2 and the dam body 1. The first retaining wall 2 is provided with a first sluice 21 that can be opened and closed corresponding to the second retaining wall 3. A second channel is restricted between the second retaining wall 3 and the first retaining wall 2, and the second channel is used to communicate with the first channel through the first sluice 21.

[0026] When the stratified water intake system of the hydropower station in the embodiment of the present invention is in use, the opening and closing of the first sluice 21 are carried out according to the water level height in front of the dam body 1. When the water level in front of the dam body 1 is higher than the first retaining wall 2, the first sluice 21 is closed, and the water body enters the water inlet 11 of the dam body 1 through the first channel, realizing the extraction of the surface water body. When the water level in front of the dam body 1 is lower than the first retaining wall 2 and higher than the second retaining wall 3, the first sluice 21 is opened, and the water body enters the first channel through the second channel and flows into the water inlet 11, realizing the extraction of the surface water body. At the same time, through the stepped arrangement of the first retaining wall 2 and the second retaining wall 3, the heat exchange between the water bodies of different water layers in the oncoming flow in front of the dam body 1 can be increased, the temperature difference between the water bodies in different layers can be reduced, which is convenient for reducing the difference between the discharged water temperature and the natural river water temperature, and reducing the adverse impact on the downstream ecological environment caused by the discharged non-uniform temperature water.

[0027] The stratified water intake system of the hydropower station in the embodiment of the present invention can quickly adjust the water body discharge channel when the water level height changes through the stepped first retaining wall 2 and second retaining wall 3, so as to realize the adaptive adjustment of the surface water intake depth with the water level variation range, which is convenient for reducing the difference between the discharged water temperature and the natural river water temperature, and reducing the adverse impact on the downstream ecological environment caused by the discharged non-uniform temperature water. Moreover, the second retaining wall 3 and the first retaining wall 2 are respectively arranged at intervals along the direction away from the dam body 1, ensuring the cross-sectional area of the water body flow channel, having little influence on the flow field and flow state of the water body, and ensuring the power generation benefit of the hydropower station.

[0028] Optionally, the distance between the first retaining wall 2 and the second retaining wall 3 is not less than the distance between the first retaining wall 2 and the dam body 1, so as to ensure the discharge capacity of the water inlet 11 of the dam body 1.

[0029] Optionally, an intake sill is provided on the upstream side of the dam body 1, and the bottoms of the first retaining wall 2 and the second retaining wall 3 are respectively buried in the intake sill.

[0030] In some embodiments, such as Figure 1 and Figure 3 As shown, it includes a guide fluid 4, which is located on the side of the second retaining wall 3 away from the first retaining wall 2. The guide fluid 4 has an inclined guide surface 41 on the side away from the second retaining wall 3. By setting the guide fluid 4, the impact of the water in front of the second retaining wall 3 can be buffered, reducing the impact of the water on the second retaining wall 3. At the same time, the guide surface 41 of the guide fluid 4 can guide the flow direction of the water flowing towards the second retaining wall 3, increasing the heat exchange of different layers of water in front of the dam, thereby facilitating the reduction of the difference between the temperature of the discharged water and the temperature of the natural river channel, and reducing the adverse impact of the discharged water with different temperatures on the downstream ecological environment.

[0031] Optionally, the fluid guide 4 and the second retaining wall 3 are cast integrally.

[0032] In some embodiments, such as Figure 1 and Figure 3 As shown, the guide surface 41 is an arc surface. The central angle corresponding to the cross section of the arc surface is no greater than 90°, and the diameter of the circle corresponding to the cross section of the arc surface is no less than the height of the guide fluid 4. By setting the guide surface 41 as an arc surface, the incoming flow of the second baffle wall 3 is further buffered and guided. The direction of the flow can be adjusted by setting the arc surface parameters, and the central angle corresponding to the cross section of the arc surface is limited. This ensures that the water body exchanges with the water body of other water layers after flowing through the guide surface 41, while reducing the consumption of the water body's kinetic energy. The diameter of the circle corresponding to the cross section of the arc surface is limited to ensure the effective height of the arc surface and improve the guiding effect on the water body.

[0033] Optionally, the angle of the central angle corresponding to the cross section of the arc surface can be 30°, 45°, 60°, or 90°, and can also be adjusted according to project needs, including but not limited to the above angles. It should be noted that the tangent of the end of the arc surface away from the dam body 1 is parallel to the inlet sill. When the height of the guide fluid 4 is constant, the smaller the angle of the central angle corresponding to the cross section of the arc surface, the greater the distance between the end of the arc surface away from the dam body 1 and the second retaining wall 3.

[0034] Optionally, the diameter of the circle corresponding to the cross-section of the arc surface is 1, 1.1, 1.2, or 1.3 times the height of the guide fluid 4.

[0035] In some embodiments, such as Figure 1 and Figure 3 As shown, the height of the guide fluid 4 is not less than the height of the second retaining wall 3, so as to avoid the water flowing through the guide fluid 4 from impacting the second retaining wall 3 and reduce the scouring of the second retaining wall 3.

[0036] In some embodiments, such as Figure 1 , Figure 2 and Figure 3 As shown, it includes a first baffle 22, which is provided corresponding to the first gate 21. The first baffle 22 has a first position and a second position. In the first position, the first baffle 22 blocks the first gate 21 to close the first gate 21. In the second position, there is a set distance between the first baffle 22 and the first gate 21 to open the first gate 21.

[0037] Specifically, the first gate 21 is provided with a first baffle 22 connected by a hydraulic strut. The first baffle 22 is moved by the hydraulic strut to open and close the first gate 21. When closing the first gate 21, the hydraulic strut extends to drive the first baffle 22 to move towards the water inlet sill until the first baffle 22 reaches the first position to block the first gate 21. When opening the first gate 21, the hydraulic strut retracts to drive the first baffle 22 to move away from the water inlet sill until the first baffle 22 reaches the second position to open the first gate 21. The first retaining wall 2 is provided with a gate groove corresponding to the first baffle 22 to ensure the sealing of the first gate 21 when the first baffle 22 is closed.

[0038] In some embodiments, such as Figure 2 As shown, the first baffle 22 has a cavity 221 and a water supply pipe 222 communicating with the cavity 221. The water supply pipe 222 is used to supply water to the cavity 221 or extract water from the cavity 221.

[0039] Specifically, a pump body is provided at the end of the water supply pipe 222. By setting a cavity 221 in the first baffle 22, when the first gate 21 is closed, water can be injected into the cavity 221 through the water supply pipe 222 to increase the overall counterweight of the first baffle 22 and ensure the stability of the first baffle 22 in sealing the first gate 21. When the first gate 21 is opened, the water in the cavity 221 can be discharged through the water supply pipe 222, thereby reducing the counterweight of the first baffle 22 and facilitating the lifting of the first baffle 22.

[0040] In some embodiments, such as Figure 2As shown, the first baffle 22 is provided with a gas supply pipe 223 communicating with the cavity 221. The gas supply pipe 223 is located on the side of the water supply pipe 222 away from the riverbed. The gas supply pipe 223 is provided with a one-way valve 224 and is used to discharge gas or water from the cavity 221. When water is injected into the cavity 221, the gas in the cavity 221 can be discharged through the gas supply pipe 223 and the one-way valve 224. When water is discharged from the cavity 221, the one-way valve 224 can prevent water outside the first baffle 22 from entering the cavity 221 through the gas supply pipe 223, thereby ensuring the weight reduction of the first baffle 22 and making the operation convenient and reliable.

[0041] In some embodiments, such as Figure 3 As shown, the first retaining wall 2 includes a first supporting wall section 23 corresponding to the dam body 1. The side of the first supporting wall section 23 facing away from the dam body 1 is inclined and the horizontal distance between it and the dam body 1 increases in the direction close to the riverbed.

[0042] Specifically, the first retaining wall 2 includes a first supporting wall section 23 and two first connecting wall sections. The two first connecting wall sections are arranged on the same side of the first supporting wall section 23 and spaced apart. The first gate 21 is set on the first supporting wall section 23. The side of the first supporting wall section 23 facing away from the dam body 1 is inclined. When drainage is carried out through the water inlet 11 of the dam body 1, the impact of the incoming flow on the first retaining wall 2 can be reduced. In addition, with the top size of the first retaining wall 2 fixed, the connection area between the bottom of the first retaining wall 2 and the water inlet sill is increased to ensure the stability of the first retaining wall 2 during use.

[0043] In some embodiments, such as Figure 3 As shown, the first support wall section 23 is inclined on the side closest to the dam body 1, and the horizontal distance between it and the dam body 1 decreases in the direction close to the riverbed.

[0044] By tilting the first support wall section 23 on the side closest to the dam body 1, the flow direction of the water is guided when the water is discharged through the first channel, ensuring the flow field and flow state of the water after passing through the first channel, thereby ensuring the power generation efficiency of the hydropower station.

[0045] In some embodiments, such as Figure 3 As shown, the second retaining wall 3 includes a second supporting wall section 31 corresponding to the dam body 1. The side of the second supporting wall section 31 closest to the dam body 1 is inclined and the horizontal distance between it and the dam body 1 decreases in the direction close to the riverbed.

[0046] Specifically, the second retaining wall 3 includes a second supporting wall section 31 and two second connecting wall sections. The two second connecting wall sections are arranged on the same side of the second supporting wall section 31 at intervals. The side of the second supporting wall section 31 close to the dam body 1 is inclined. When discharging water through the second channel, it guides the flow direction of the water body, ensures the flow field and flow state of the water body after passing through the second channel, and thus ensures the power generation efficiency of the hydropower station.

[0047] In some embodiments, as Figure 1 and Figure 3 shown, it includes a third retaining wall 5. The third retaining wall 5 is arranged between the first retaining wall 2 and the second retaining wall 3. The height dimension of the third retaining wall 5 is greater than the height dimension of the second retaining wall 3 and less than the height dimension of the first retaining wall 2. The third retaining wall 5 is provided with an openable and closable second sluice 51 corresponding to the first retaining wall 2 and the second retaining wall 3. A third channel is restricted between the third retaining wall 5 and the first retaining wall 2, and a second channel is restricted between the second retaining wall 3 and the third retaining wall 5. The third channel is used to communicate with the first channel through the first sluice 21, and the second channel is used to communicate with the first channel through the first sluice 21 and the second sluice 51.

[0048] Specifically, the third retaining wall 5 is arranged between the first retaining wall 2 and the second retaining wall 3. The cross-section of the third retaining wall 5 is also in an inverted U shape. The height dimension of the third retaining wall 5 is less than that of the first retaining wall 2 and greater than that of the second retaining wall 3. A third channel is restricted between the third retaining wall 5 and the first retaining wall 2, and the third channel and the first channel are connected through the first sluice 21. A second channel is restricted between the second retaining wall 3 and the third retaining wall 5, and the second channel and the third channel are connected through the second sluice 51. When the water level in front of the dam body 1 is lower than the first retaining wall 2 and higher than the third retaining wall 5, the first sluice 21 is opened, and the water body enters the first channel through the third channel and flows into the water inlet 11, realizing the extraction of the surface water of the water body. When the water level in front of the dam body 1 is lower than the third retaining wall 5 and higher than the second retaining wall 3, the first sluice 21 and the second sluice 51 are opened, and the water body enters the third channel through the second channel and flows into the water inlet 11 through the first channel, realizing the extraction of the surface water of the water body.

[0049] By setting the third retaining wall 5, it is further ensured that the water discharge channel can be quickly adjusted when the water level changes, so as to adaptively adjust the surface water intake depth with the water level amplitude. At the same time, the third retaining wall 5 is arranged stepwise between the first retaining wall 2 and the second retaining wall 3, which can further increase the flow exchange of the water bodies between different water layers in the oncoming flow in front of the dam body 1, reduce the temperature difference of the water bodies in different layers, facilitate reducing the difference between the discharged water temperature and the natural river water temperature, and reducing the adverse impact of the discharged stratified water on the downstream ecological environment.

[0050] Optionally, the height of the first retaining wall 2 is set according to the check flood discharge level of the dam body 1, the height of the second retaining wall 3 is set according to the dead water level of the dam body 1, and the height of the third retaining wall 5 is set according to the normal water storage level of the dam body 1.

[0051] Optionally, a second baffle corresponding to the second gate 51 is provided. The second baffle is connected to the third retaining wall 5 via a hydraulic support rod. The hydraulic support rod drives the second baffle to move, thereby opening and closing the second gate 51. When closing the second gate 51, the hydraulic support rod extends to drive the second baffle to move towards the inlet sill until the second baffle blocks the second gate 51. When opening the second gate 51, the hydraulic support rod retracts to drive the second baffle to move away from the inlet sill. The third retaining wall 5 is provided with a gate groove corresponding to the second baffle to ensure the seal of the second baffle when the second gate 51 is closed.

[0052] In some embodiments, at least two third retaining walls 5 are provided, and the height of the plurality of third retaining walls 5 increases in the direction close to the dam body 1. A fourth channel is restricted between two adjacent third retaining walls 5, and the fourth channel is used to communicate with the first channel through the first gate 21 and the second gate 51.

[0053] By setting up multiple third retaining walls 5, the drainage channels between the first retaining wall 2 and the second retaining wall 3 can be further increased, which can further facilitate the extraction of surface water at different water levels, reduce the difference between the temperature of the discharged water and the temperature of the natural river channel, and reduce the adverse impact of the discharged water with different temperatures on the downstream ecological environment.

[0054] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A stratified water intake system for a hydropower station, characterized in that, Comprising: A dam body, which has a water inlet. A first retaining wall and a second retaining wall, which are arranged in a stepped shape corresponding to the water inlet on the dam body. The second retaining wall is arranged on the side of the first retaining wall away from the dam body, and the height dimension of the second retaining wall is smaller than that of the second retaining wall. The cross-sections of the first retaining wall and the second retaining wall are in an "L" shape. A first channel for the water supply body to pass through is restricted between the first retaining wall and the dam body. The first retaining wall is provided with a first sluice that can be opened and closed corresponding to the second retaining wall. A second channel is restricted between the second retaining wall and the first retaining wall, and the second channel is used to communicate with the first channel through the first sluice.

2. The hydropower station stratified water intake system according to claim 1, characterized in that, Comprising a fluid guide, which is arranged on the side of the second retaining wall背离 the first retaining wall, and a guide surface is inclinedly arranged on the side of the fluid guide背离 the second retaining wall.

3. The hydropower station stratified water intake system according to claim 2, characterized in that, The guide surface is an arc surface, the central angle corresponding to the cross-section of the arc surface is not more than 90°, and the diameter dimension of the circle corresponding to the cross-section of the arc surface is not less than the height dimension of the fluid guide, and / or, the height of the fluid guide is not less than the height of the second retaining wall.

4. The hydropower station stratified water intake system according to any one of claims 1-3, characterized in that, Comprising a third retaining wall, which is arranged between the first retaining wall and the second retaining wall. The height dimension of the third retaining wall is greater than that of the second retaining wall and less than that of the first retaining wall. The third retaining wall is provided with a second sluice that can be opened and closed corresponding to the first retaining wall and the second retaining wall. A third channel is restricted between the third retaining wall and the first retaining wall. The second channel is restricted between the second retaining wall and the third retaining wall. The third channel is used to communicate with the first channel through the first sluice. The second channel is used to communicate with the first channel through the first sluice and the second sluice.

5. The hydropower station stratified water intake system according to claim 4, characterized in that, There are at least two third retaining walls, and the height dimensions of the multiple third retaining walls increase along the direction close to the dam body. A fourth channel is restricted between two adjacent third retaining walls, and the fourth channel is used to communicate with the first channel through the first sluice and the second sluice.

6. The hydropower station stratified water intake system according to any one of claims 1-3, characterized in that, Comprising a first baffle, which is arranged corresponding to the first sluice. The first baffle has a first position and a second position. In the first position, the first baffle blocks the first sluice to close the first sluice. In the second position, there is a set distance between the first baffle and the first sluice to open the first sluice.

7. The hydropower station stratified water intake system according to claim 6, characterized in that, The first baffle has a cavity, and the first baffle is provided with a water delivery pipe communicating with the cavity. The water delivery pipe is used to deliver water into the cavity or extract the water in the cavity.

8. The hydropower station stratified water intake system according to claim 7, characterized in that, The first baffle is provided with an air delivery pipe communicating with the cavity. The air delivery pipe is arranged on the side of the water delivery pipe远离 the riverbed. The air delivery pipe is provided with a check valve and is used to discharge the gas or water in the cavity.

9. The hydropower station stratified water intake system according to any one of claims 1-3, characterized in that, The first retaining wall includes a first support wall section arranged corresponding to the dam body. The side of the first support wall section背离 the dam body is inclinedly arranged, and the horizontal distance between it and the dam body increases along the direction close to the riverbed. It should be noted that in the original text, there may be some inaccuracies or unclear expressions. For example, in , "所述第二挡墙的高度尺寸小于所述第二挡墙的高度尺寸" seems incorrect. This translation is based on the existing text as accurately as possible.

10. The hydropower station stratified water intake system according to claim 9, characterized in that, The first supporting wall segment is inclined on the side closest to the dam body and the horizontal distance between it and the dam body decreases in the direction close to the riverbed, and / or the second retaining wall includes a second supporting wall segment corresponding to the dam body, the side of the second supporting wall segment being inclined on the side closest to the dam body and the horizontal distance between it and the dam body decreasing in the direction close to the riverbed.

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