A sluice ecological flow transformation and measurement system and its control method

Abstract

The present invention relates to the field of ecological flow transformation, and particularly to a sluice ecological flow transformation and metering system and its control method. It includes a fixed building, a water retaining device, a water measuring device, a measuring device, a monitoring device, and a control system. Specifically, the fixed building includes pier columns, a support structure, and a working bridge, and water-stop lifting grooves are provided on both sides of the pier columns; the water retaining device includes an upper baffle, a middle baffle, a lower baffle, an electric control pin type close-coupled coupler, and rollers; a groove is provided at the lower part of the water-facing surface of the upper baffle; a convex groove is provided at the upper part of the water-facing surface of the middle baffle, and a groove is provided at the lower part; a groove is provided at the upper part of the water-facing surface of the lower baffle; the water measuring device includes a water measuring weir plate, a sealing strip, and rollers; by controlling the water head above the weir, real-time regulation of ecological flow under dynamic water levels is achieved, effectively ensuring that the ecological flow in the downstream river channel meets the standards.

Description

Technical Field

[0001] The present invention relates to the field of ecological flow transformation, and particularly to a sluice ecological flow transformation and metering system and its control method. Background Art

[0002] Ecological flow is the basis for maintaining the structure and function of river and lake ecosystems and improving the quality and stability of river and lake ecosystems. For a long time, in the face of demands such as river channel hydropower development, increasing water withdrawal, and urban water landscapes, water retaining projects such as river blocking sluices have been increasing day by day, and the normal connectivity of river channels has been blocked, posing a great challenge to the normal discharge of ecological flow. As the most common river blocking structure, how to ensure the accurate discharge and metering of its ecological flow is crucial for ensuring the downstream ecological flow. Considering functions and costs, most sluices do not have dedicated ecological flow discharge channels or fishways at the beginning of construction. Therefore, there are mainly two ways to discharge the ecological flow of existing sluices: one is to discharge through the power generation tail water and measure it using a pipeline flowmeter; the other is to raise the local gate and use the bottom hole of the sluice to discharge the flow, and calculate the flow under different working conditions by using the relationship curve of opening ~ flow under different water level conditions obtained through theoretical calculation or experiment. The first way of discharging ecological flow has high recording accuracy, but this scheme is greatly affected by the water level difference between upstream and downstream. When the water level difference is less than the designed power generation head, for the sake of power generation benefits, the upstream water inlet is often closed to raise the upstream water level, thus affecting the normal discharge of ecological flow; on the one hand, when discharging ecological flow through the lower bottom hole, when the water level difference between upstream and downstream is large, it will cause complex turbulent structures and vibrations under the sluice, and long-term operation will affect the overall structural stability and service life of the sluice. On the other hand, under changing water level conditions, the relationship between different openings and flows has large differences, making it difficult to achieve accurate measurement and real-time regulation of ecological flow under changing water levels. Therefore, there is an urgent need for a sluice ecological flow transformation and metering system that can achieve accurate metering and real-time regulation of ecological flow on the basis of ensuring the overall structural stability of the sluice, and at the same time has the advantages of simple structure, smooth water flow pattern, and no new land occupation. Summary of the Invention

[0003] The present invention overcomes the deficiencies of the prior art and provides a sluice ecological flow transformation and metering system and its control method.

[0004] To achieve the above object, taking a single sluice chamber as an example, the technical solution adopted by the present invention is as follows:

[0005] The first aspect of the present invention discloses a sluice ecological flow transformation and metering system, including a fixed building, a water retaining device, a water measuring device, a measuring device, a monitoring device, and a control system;

[0006] The fixed building includes a pier, a support structure, and a working bridge, and there are water stop lifting grooves on both sides of the pier;

[0007] The water retaining device includes an upper baffle, a middle baffle, a lower baffle, an electric control pin type close coupler connector and rollers; a groove is provided at the lower part of the water-facing surface of the upper baffle; a convex groove is provided at the upper part of the water-facing surface of the middle baffle, and a groove is provided at the lower part; a groove is provided at the upper part of the water-facing surface of the lower baffle.

[0008] The water measuring device includes a water measuring weir plate, a sealing strip and rollers; a slot is provided at the upper part of the water measuring weir plate, and the sealing strip is located on the left and right sides and the lower part of the water-backing surface of the water measuring weir plate. Under the action of water pressure, the water measuring device, the water retaining device and the pier form a closed water retaining system; the rollers are located on the left and right sides of the water measuring weir plate.

[0009] The monitoring device includes a support rod and a radar water level gauge. The support rod is located on the working bridge and its end extends into the upstream river. The radar water level gauge is located at the end of the support rod and can read the water level data in real time and transmit it to the central control system.

[0010] The control system includes a central control system, an electric control measuring weir crane, an electric control gate crane, a first towing rope and a second towing rope; the central control system can receive the real-time upstream water level monitored by the radar water level gauge and can control the electric control measuring weir crane, the electric control gate crane and the electric control system; one end of the first towing rope is connected to the electric control measuring weir crane, and the other end is connected to the water measuring device; one end of the second towing rope is connected to the electric control gate crane, and the other end is connected to the upper baffle.

[0011] Further, in a preferred embodiment of the present invention, the electric control pin type close coupler connector includes a housing, a hook tongue, a spring device, an electric power device, an electric control system, an electric winch, a rope and a fixed pulley; the rollers are located on both sides of the upper baffle, the middle baffle and the lower baffle; the electric control pin type close coupler connector is located on both sides of the lower part of the upper baffle, on the upper and lower sides of the middle baffle, and on the upper sides of both sides of the lower baffle.

[0012] Further, in a preferred embodiment of the present invention, the upper baffle, the middle baffle and the lower baffle can move up and down in the water stop lifting groove driven by the electric control gate crane and the second towing rope; the water measuring weir plate can move up and down in the water stop lifting groove driven by the electric control measuring weir crane and the first towing rope, and the water body in the upstream of the river can be discharged through the slot on the water measuring weir plate.

[0013] Further, in a preferred embodiment of the present invention, the lower part of the groove in the upper baffle can be coupled and closely connected with the convex groove of the adjacent middle baffle; the groove of the middle baffle can be coupled and closely connected with the convex groove of the adjacent middle baffle or the convex groove of the lower baffle, and form a closed water blocking system with the pier under the action of water pressure.

[0014] Further, in a preferred embodiment of the present invention, a manual unhooking device is fixed to the tail of the hook tongue; the spring device is in a stretched state; one end of the spring device is connected to the housing, and the other end is connected to the manual unhooking device.

[0015] Further, in a preferred embodiment of the present invention, the power device is an electric control system, which is controlled by the central control system and can control the electric winch to wind and unwind the rope; one end of the rope is connected to the electric winch, and the other end is connected to the manual unhooking device.

[0016] Further, in a preferred embodiment of the present invention, the electric control pin type close coupler can achieve automatic locking under the self-weight of the water retaining device, and can also be unhooked by manually or driving the electric winch to drive the rope movement through the electric control system; when unhooking, the electric control pin type close couplers at the same height are unhooked synchronously.

[0017] Further, in a preferred embodiment of the present invention, the slot width and depth of the water measuring weir plate are determined according to the required ecological discharge; the density of the water retaining device and the water measuring device should be greater than the density of the water body so as to move downward under the action of self-weight and buoyancy.

[0018] The second aspect of the present invention discloses a control method for a water gate ecological flow transformation and measurement system, which is applied to any one of the water gate ecological flow transformation and measurement systems, and includes the following steps:

[0019] Determine the specific form, slot width, slot height of the appropriate water measuring weir plate and the number of gate openings of the water gate to be transformed according to the required ecological discharge target, and then determine the adopted weir flow formula and the applicable water level range;

[0020] Optimize the water retaining device, add water measuring devices, central control system, radar water level gauge, electric control measuring weir crane, electric control gate crane and the first traction rope and the second traction rope, and install and connect the devices according to the preset relationship to make the devices operate normally;

[0021] Among them, there are mainly four situations during the operation of the device: namely, 3h0 ≤ upstream water level < 4h0; 2h0 ≤ upstream water level < 3h0; h0 ≤ upstream water level < 2h0; upstream water level < h0;

[0022] Among them, h0 is the height of the upper baffle, two middle baffles and the lower baffle, and the heights of the upper baffle, two middle baffles and the lower baffle are equal.

[0023] Further, in a preferred embodiment of the present invention, the following steps are further included:

[0024] When the first situation occurs, that is, 3h0 ≤ upstream water level < 4h0, the upstream water level is between the upper baffles; based on the upstream water level feedback by the radar water level gauge and the following weir flow formula, the corresponding weir head h is deduced backwards: when the weir head h ≤ 3h0, the electro-controlled pin-type close-coupling coupler of the upper baffle is unhooked through the central control system, and the electro-controlled measuring weir crane is controlled to pull the upper baffle up, and the water measuring device and the other baffles are used to achieve upper water blocking and real-time ecological flow control and discharge; when h0 > h ≥ 3h0, the electro-controlled pin-type close-coupling coupler of the first middle baffle is unhooked through the central control system, and the electro-controlled measuring weir crane is controlled to pull the upper baffle and the first middle baffle up, and the water measuring device and the other baffles are used to achieve upper water blocking and real-time ecological flow control and discharge; when the weir head h ≥ h0, other modified sluice gate openings are used for flow discharge, and the principle is the same as above;

[0025] When the second situation occurs: 2h0 ≤ upstream water level < 3h0, the upstream water level is between the first middle baffles. At this time, the regulation method and principle are the same as those of the first situation;

[0026] When the third situation occurs: h0 ≤ upstream water level < 2h0, the upstream water level is between the second middle baffles; based on the upstream water level feedback by the radar water level gauge and the following weir flow formula, the corresponding weir head h is deduced backwards: when the weir head h ≤ h0, the electro-controlled pin-type close-coupling coupler of the second lower baffle is unhooked through the central control system, and the electro-controlled measuring weir crane is controlled to pull the upper baffle and the two middle baffles up, and the water measuring device and the other baffles are used to achieve upper water blocking and real-time ecological flow control and discharge; when h0 > h ≥ h0, other modified sluice gate openings are used for flow discharge, and the principle is the same as above;

[0027] When the fourth situation occurs: upstream water level < h0, the upstream water level is between the lower baffles. At this time, the water measuring weir plate is unable to discharge the ecological flow. Considering that the water level difference between upstream and downstream is small at this time, this situation only occurs in extremely dry years. The ecological flow is discharged through the bottom holes at the lower part of the gate by directly raising the water blocking device as a whole.

[0028] The beneficial technical effects of the present invention are as follows:

[0029] Through the effective combination of fixed buildings, water blocking devices, water measuring devices, measuring devices, and control systems, the present invention can, on the premise of improving the water flow pattern and ensuring the structural safety, normal flood discharge, and water storage functions of the sluice, accurately calculate the flow rate of the water flow passing through the water measuring device through the weir flow formula, and realize the real-time regulation of the ecological flow under the dynamic water level by controlling the weir head, effectively ensuring that the ecological flow in the downstream river reaches the standard; moreover, on the premise of not newly adding construction land, the existing sluice chamber can be transformed to realize the real-time metering function of the sluice with a high metering accuracy rate, and the investment in land expropriation and demolition can be saved;

[0030] The present invention also proposes a new method for controlling the ecological flow of a sluice, which can meet the requirements of discharging the ecological flow of rivers with different basin areas, widths, and water level change ranges by selecting thin-walled weir forms with different forms, grooving depths, and widths or by reconstructing the number of sluice chambers, and has wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0032] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0033] Figure 2 It is a schematic diagram of the structure of the A-A section of the present invention;

[0034] Figure 3 It is a front view structural schematic diagram of the water retaining device of the present invention;

[0035] Figure 4 It is a front view structural schematic diagram of the water measuring device of the present invention;

[0036] Figure 5 It is a side view structural schematic diagram of the water retaining device of the present invention;

[0037] Figure 6 It is a top view structural schematic diagram of the lower baffle of the present invention;

[0038] Figure 7 It is a structural schematic diagram of the electric control pin type close-coupled coupler of the present invention;

[0039] Figure 8 It is a schematic diagram of the B-B section of the present invention;

[0040] Figure 9 It is a schematic diagram of the C-C section of the present invention;

[0041] Figure 10 It is a schematic diagram of the control system of the present invention;

[0042] Figure 11 and 12 is for looking up the discharge coefficient;

[0043] The descriptions of the reference numerals are as follows:

[0044] 1. Fixed building; 2. Water retaining device; 3. Water measuring device; 4. Measuring device; 5. Control system; 11. Pier; 11a. Water stop lifting groove; 12. Support structure; 13. Working bridge; 21. Upper baffle; 21a. Groove; 22. Middle baffle; 22a. Convex groove; 22b. Groove; 23. Lower baffle; 23a. Groove; 24. Electric control pin type close coupler connector; 24a. Housing; 24b. Hook tongue; 24c. Spring device; 24d. Power device; 24e. Electric control system; 24f. Electric winch; 24g. Rope; 24h. Fixed pulley; 25. Roller; 31. Water measuring weir plate; 32. Sealing edge strip; 33. Roller; 41. Support rod; 42. Radar water level gauge; 51. Central control system; 52. Electric control measuring weir crane; 53. Electric control gate crane; 54. First towing rope; 55. Second towing rope. Detailed implementation mode

[0045] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation modes. These drawings are all simplified schematic diagrams, only showing the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0046] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application 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 a limitation on the protection scope of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Therefore, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0047] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0048] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0049] As Figures 1 to 9 shown, the present invention provides a sluice ecological flow transformation and metering system, including a fixed building 1, a water retaining device 2, a water measuring device 3, a measuring device 4, and a control system 5;

[0050] The fixed building includes pier 11, support structure 12, and working bridge 13. Water stop lifting grooves 11a are provided on both sides of the pier 11;

[0051] The water retaining device 2 includes an upper baffle 21, a middle baffle 22, a lower baffle 23, an electric control pin type close coupler connector 24, and rollers 25; a groove 21a is provided at the lower part of the water-facing surface of the upper baffle 21; a convex groove 22a is provided at the upper part of the water-facing surface of the middle baffle 22, and a groove 22b is provided at the lower part; a groove 23a is provided at the upper part of the water-facing surface of the lower baffle 23; the electric control pin type close coupler connector 24 includes a housing 24a, a hook tongue 24b, a spring device 24c, a power device 24d, an electric control system 24e, an electric winch 24f, a rope 24g, and a fixed pulley 24h; the rollers 25 are located on both sides of the upper baffle 21, the middle baffle 22, and the lower baffle 23; the electric control pin type close coupler connector 24 is located on both sides of the lower part of the upper baffle 21, on both the upper and lower sides of the middle baffle 22, and on both the upper sides of the lower baffle 23;

[0052] The water measuring device 3 includes a water measuring weir plate 31, a sealing strip 32, and rollers 33; the upper part of the water measuring weir plate 31 is provided with a slot; the sealing strip 32 is located on the left and right sides and the lower part of the back water surface of the water measuring weir plate. Under the action of water pressure, the water measuring device 3, the water retaining device 2, and the pier can form a closed water retaining system; the rollers are located on both sides of the water measuring weir plate 31;

[0053] The monitoring device 4 includes a support rod 41 and a radar water level gauge 42. The support rod 41 is located on the working bridge and the end thereof extends into the upstream river channel. The radar water level gauge 42 is located at the end of the support rod 41 and can read the water level data in real time and transmit it to the central control system 51.

[0054] like Figure 10 As shown, the control system 5 includes a central control system 51, an electrically controlled measuring weir crane 52, a traction device 53, a first traction rope 54, and a second traction rope 55; the central control system can receive the real-time upstream water level monitored by the radar water level meter 42, and can control the electrically controlled measuring weir crane 52, the electrically controlled gate crane 53 and the electronic control system 24e; one end of the first traction rope 54 is connected to the electrically controlled measuring weir crane 52, and the other end is connected to the water measuring device 3; one end of the second traction rope 55 is connected to the electrically controlled gate crane 53, and the other end is connected to the upper baffle 21.

[0055] The upper baffle 21, the middle baffle 22, and the lower baffle 23 can move up and down in the water-stop lifting groove 11a driven by the electric-controlled gate crane 53 and the second traction rope 55; the water-measuring weir plate 31 can move up and down in the water-stop lifting groove 11a driven by the electric-controlled measuring weir crane 52 and the first traction rope 54, and the water in the upstream of the river channel can be discharged through the slots on the water-measuring weir plate 31;

[0056] The lower part of the groove 21a in the upper baffle plate 21 can be coupled and tightly connected with the convex groove 22a of the adjacent middle baffle plate 22; the groove 22b of the middle baffle plate 22 can be coupled and tightly connected with the convex groove 22a of the adjacent middle baffle plate 22 or the convex groove 23a of the lower baffle plate 23, and form a closed water-blocking system with the gate pier under the action of water pressure.

[0057] The groove form of the water measuring weir plate 31 should adopt the commonly used thin-walled water measuring weir forms such as triangular weir notch thin-wall weir, so as to calculate the flow rate through the weir; the groove shape and thickness of the water measuring weir plate 31 should comply with the requirements of the "Specifications for Flow Measurement of Hydraulic Structures and Weirs (SL 537-2011)".

[0058] The tail of the hook tongue 24b is fixed with a manual unhooking device 24i; the spring device 24c should be in a stretched state; one end of the spring device 24c is connected to the housing 24a, and the other end is connected to the manual unhooking device 24i;

[0059] The power device 24d can provide power to the electric control system 24e and the electric winch 24f. The electric control system 24e is controlled by the central control system 51 and can control the electric winch 24f to retract and release the rope 24g. One end of the rope 24g is connected to the electric winch 24f, and the other end is connected to the manual unhooking device 24i.

[0060] The electric control pin - type close - coupled coupler 24 can achieve automatic locking of the hook under the self - weight of the water - retaining device 2, and can also achieve unhooking by manually or electrically controlling the system 24e to drive the electric winch 24f to drive the movement of the rope 24g; when unhooking, the electric control pin - type close - coupled couplers 24 at the same height should unhook synchronously.

[0061] The grooving width and depth of the weir plate 31 should be determined according to the required ecological discharge and the water gate to be transformed.

[0062] The density of the water - retaining device 2 and the water - measuring device 3 should be greater than the density of the water body so as to move downward under the action of self - weight and buoyancy.

[0063] The operating principle of the present invention is as follows:

[0064] In the first step, according to the ecological discharge target for downstream release, determine the specific form of the appropriate weir plate 31 (such as triangular thin - wall weir, rectangular thin - wall weir, equal - width thin - wall weir, etc.), grooving width, grooving height, and the number of gate holes of the water gate to be transformed, and then determine the adopted weir flow formula and applicable water level range. For the convenience of explanation, in this example, it is assumed that a triangular thin - wall weir is adopted, the notch θ of the triangular weir is 90°, the height of the water - retaining baffle 21 is 4h0 (the heights of the upper baffle 21, two middle baffles 22, and lower baffle 23 are all h0), the height of the water - measuring baffle 31 is 2h0, the grooving height of the water - measuring baffle 31 is h0, and the number of gate holes of the water gate to be transformed is n (1 ≤ n ≤ the total number of flat weirs).

[0065] In the second step, according to Figure 1 、 Figure 2 shown, transform the required lock chamber. The main transformation is to optimize the water - retaining device 2, add a water - measuring device 3, a central control system 51, a radar water level gauge 42, an electric - control measuring weir crane 52, an electric - control gate crane 53, and the first towing rope 54 and the second towing rope 55, and install and connect the relevant devices according to the illustrated relationship.

[0066] So far, the device installation is completed and can operate normally.

[0067] When the device is operating, there are mainly four situations: ① 3h0 ≤ upstream water level < 4h0; ② 2h0 ≤ upstream water level < 3h0; ③ h0 ≤ upstream water level < 2h0; ④ upstream water level < h0. It should be noted that according to the requirements of the water gate operation, it is basically impossible for the upstream water level to be ≥ 4h0 and thus the situation of over - flow at the top of the gate occurs. However, when the water level rises above the flood - limit water level, some or all of the gates will be opened to discharge flood and reduce the upstream water level.

[0068] The first situation: 3h0 ≤ upstream water level < 4h0. The upstream water level is between the upper baffles 21.

[0069] The upstream water level fed back by the radar water level gauge 42 and the following weir flow formula can be used to inversely calculate the corresponding weir head h: ① When the weir head h ≤ (upstream water level - 3h0), the central control system 51 controls the electric pin - type close coupler 24 of the upper baffle 21 to uncouple, and controls the electric measuring weir crane 52 to pull the upper baffle 21 upward, using the water measuring device 2 and the remaining baffles to achieve upper water retention and real - time ecological flow control and discharge; ② When h0 > h ≥ (upstream water level - 3h0), the central control system 51 controls the electric pin - type close coupler 24 of the first middle baffle 22 to uncouple, and controls the electric measuring weir crane 52 to pull the upper baffle 21 and the first middle baffle 22 upward, using the water measuring device 2 and the remaining baffles to achieve upper water retention and real - time ecological flow control and discharge; ③ When the weir head h ≥ h0, other transformed sluice gate holes should be used for flow discharge, and the principle is the same as above;

[0070] ,

[0071] In the formula: Q —— Discharge through the weir, m³ / s

[0072] C e —— Discharge coefficient, which can be found in Figure 11 、 Figure 12

[0073] n —— Number of transformed flat weirs

[0074] h e —— Effective weir crest head, h e = h + K h

[0075] h —— Measured weir crest head, which can be controlled by the electric winch telescopic control and deduced in this example

[0076] K h —— Head correction value, when θ = 90°, K h = 0.00085m

[0077] θ —— Included angle of the triangular notch, which is 90° in this example

[0078] The second case: 2h0 ≤ upstream water level < 3h0, and the upstream water level is between the first middle baffle 22. At this time, the regulation method and principle can be similar to the first case.

[0079] The third case: h0 ≤ upstream water level < 2h0, and the upstream water level is between the middle baffles 22 of the second block. At this time, the regulation method and principle can be analogized to the first case.

[0080] Based on the upstream water level feedback by the radar water level gauge 42 and the following weir flow formula, the corresponding weir head h can be deduced inversely: ① When the weir head h ≤ (upstream water level - h0), the central control system 51 controls the decoupling of the electric pin - type close - coupled coupler 24 of the lower baffle 22 of the second block, and controls the electric - controlled measuring weir crane 52 to pull up the upper baffle 21 and the two middle baffles 22, and uses the water measurement device 2 and the remaining baffles to achieve upper water blocking and real - time ecological flow control and discharge; ② When h0 > h ≥ (upstream water level - h0), other modified sluice gate openings should be used for flow discharge, and the principle is the same as above.

[0081] The fourth case: upstream water level < h0, and the upstream water level is between the lower baffles 23. At this time, the water measurement weir plate 31 can no longer discharge ecological flow. Considering that the water level difference between upstream and downstream is small at this time, and this situation occurs less frequently (generally only in extremely dry years), the water blocking device 1 can be directly lifted as a whole, and the ecological flow is discharged through the bottom holes at the lower part of the gate.

[0082] According to the actual situation and the definition of ecological flow, generally, the incoming flow at the upstream of the sluice will still be greater than the ecological flow discharge under the condition of the driest month. Coupled with other months with more abundant incoming water, the upstream water level of the sluice is generally in the first, second, and third states. The fourth state appears more in the extremely dry months of extremely dry years. At this time, according to the corresponding management measures, a certain degree of ecological flow disruption is allowed.

[0083] The above is inspired by the ideal embodiments of the present invention, and its description is relatively specific and detailed. However, it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A sluice ecological flow transformation and metering system, comprising a fixed building, a water retaining device, a water measuring device, a measuring device, a monitoring device and a control system, characterized in that: The fixed building includes a gate pier, a supporting structure and a working bridge, and water-stop lifting grooves are provided on both sides of the gate pier; The water retaining device comprises an upper baffle, a middle baffle, a lower baffle, an electric-controlled pin-type close-fitting car coupler connector and a roller; a groove is provided at the lower part of the water-facing surface of the upper baffle; a convex groove is provided at the upper part of the water-facing surface of the middle baffle, and a groove is provided at the lower part; a groove is provided at the upper part of the water-facing surface of the lower baffle; The water measuring device comprises a water measuring weir plate, a sealing edge strip and a roller; the upper part of the water measuring weir plate is grooved, the sealing edge strip is located on the left and right sides and the lower part of the back surface of the water measuring weir plate, and under the action of water pressure, the water measuring device, the water retaining device and the gate pier form a closed water retaining system; the roller is located on the left and right sides of the water measuring weir plate; The monitoring device includes a support rod and a radar water level gauge. The support rod is located on the working bridge and the end thereof extends into the upstream river channel. The radar water level gauge is located at the end of the support rod and can read the water level data in real time and transmit it to the central control system. The control system includes a central control system, an electrically controlled measuring weir crane, an electrically controlled gate crane, a first traction rope and a second traction rope; the central control system can receive the real-time upstream water level monitored by a radar water level gauge, and can control the electrically controlled measuring weir crane, the electrically controlled gate crane and the electrical control system; one end of the first traction rope is connected to the electrically controlled measuring weir crane, and the other end is connected to a water measuring device; one end of the second traction rope is connected to the electrically controlled gate crane, and the other end is connected to an upper baffle.

2. The ecological flow transformation and metering system for a sluice according to claim 1, characterized in that: The electrically controlled pin-type close-fitting coupler connector includes a shell, a hook tongue, a spring device, an electric device, an electric control system, an electric winch, a rope, and a fixed pulley; the rollers are located on both sides of the upper baffle, the middle baffle, and the lower baffle; the electrically controlled pin-type close-fitting coupler connector is located on both sides of the lower part of the upper baffle, the upper and lower sides of the middle baffle, and the upper sides of the lower baffle.

3. The ecological flow transformation and metering system for a sluice according to claim 1, characterized in that: The upper baffle, the middle baffle and the lower baffle can move up and down in the water-stop lifting groove driven by the electric-controlled gate crane and the second traction rope; the water measuring weir plate can move up and down in the water-stop lifting groove driven by the electric-controlled measuring weir crane and the first traction rope, and the water body upstream of the river can be discharged through the grooves on the water measuring weir plate.

4. The ecological flow transformation and measurement system of a sluice according to claim 1, characterized in that: The lower part of the groove in the upper baffle plate can be coupled and tightly connected with the convex groove of the adjacent middle baffle plate; the groove of the middle baffle plate can be coupled and tightly connected with the convex groove of the adjacent middle baffle plate or the convex groove of the lower baffle plate, and form a closed water-blocking system with the gate pier under the action of water pressure.

5. The ecological flow transformation and metering system for a sluice according to claim 2, characterized in that: A manual unhooking device is fixed to the tail of the hook tongue; the spring device is in a stretched state; one end of the spring device is connected to the housing, and the other end is connected to the manual unhooking device.

6. The ecological flow transformation and measurement system of a sluice according to claim 5, characterized in that: The power device is an electric control system, which is controlled by a central control system and can control the electric winch to retract and release the rope; one end of the rope is connected to the electric winch, and the other end is connected to a manual unhooking device.

7. The ecological flow transformation and metering system of a sluice according to claim 1, characterized in that: The electric control pin - type close - coupled coupler realizes automatic locking under the self - weight of the water - retaining device, or realizes uncoupling by means of driving an electric winch to drive a rope to move through a manual or electric control system; during uncoupling, the electric control pin - type close - coupled couplers at the same height are uncoupled synchronously.

8. The ecological flow transformation and metering system for a sluice according to claim 1, characterized in that: The slot width and depth of the water - measuring weir plate are determined according to the required ecological discharge; the density of the water - retaining device and the water - measuring device should be greater than the density of the water body so as to move downward under the action of self - weight and buoyancy.

9. A control method for the ecological flow transformation and metering system of a sluice, applied to the ecological flow transformation and metering system of a sluice according to any one of claims 1-8, characterized in that, It includes the following steps: Determine the specific form, slot width, slot height of the appropriate water - measuring weir plate and the number of gate holes of the sluice to be transformed according to the required ecological discharge target, and then determine the adopted weir flow formula and the applicable water level range. Optimize the water - retaining device, add a water - measuring device, a central control system, a radar water level gauge, an electric control measuring weir crane, an electric control gate crane, and the first and second towing ropes, and install and connect the devices according to the preset relationship to make the devices operate normally. Among them, there are mainly four situations during the operation of the device: namely, \(3h_0\leqslant\) upstream water level \(\lt4h_0\); \(2h_0\leqslant\) upstream water level \(\lt3h_0\); \(h_0\leqslant\) upstream water level \(\lt2h_0\); upstream water level \(\lt h_0\). Among them, \(h_0\) is the height of the upper baffle, two middle baffles and the lower baffle, and the heights of the upper baffle, two middle baffles and the lower baffle are equal.

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