Ecological water conservancy restoration method suitable for improving agricultural polder area water environment

Abstract

The invention discloses an ecological water conservancy restoration method suitable for improving the water environment of an agricultural polder area. The agricultural polder area comprises a farmland, an ecological pond and a ditch. The method is applied to a non-flood season without irrigation, and comprises the following steps: (1) collecting hydrological and water quality monitoring data of an ecological pond and a ditch, and sending the hydrological and water quality monitoring data to a remote central control system; (2) the central control system judges the water quality classification of the ecological pond and the ditch according to the monitoring data and judges whether the water quantity in the agricultural polder area is sufficient or not, and ecological water conservancy restoration is executed according to the judgment result. The ecological water conservancy restoration method is provided for the agricultural polder area tiny water body with the defects that water exchange is blocked, the water body self-purification capacity is poor, and the water environment quality is poor in the polder area, and on the premise that flood prevention and drought resistance are fully guaranteed, the ecological water conservancy restoration method can effectively improve the water environment quality of the agricultural polder area tiny water body; and in addition, a central control system can be adopted for intelligent water conservancy regulation and control, and intelligent ecological water conservancy restoration can be achieved.

Description

Technical Field

[0001] This application belongs to the technical field of plain river network water environment governance, and specifically relates to an ecological water conservancy restoration method applicable to the improvement of water environment in agricultural polder areas. Background Art

[0002] Polders in plain river network areas are generally located along lakes or rivers and are greatly affected by agricultural activities such as planting and breeding. There are many small water bodies in the area, such as ditches, ponds, inland rivers, etc. These small water bodies have the characteristics of slow flow velocity, strong artificial interference, and poor water environment quality. The nitrogen and phosphorus content in the water body is high, the self-purification ability is low, and the nitrogen and phosphorus load entering the rivers and lakes is large, resulting in serious eutrophication of the surrounding rivers and lakes, low transparency and dissolved oxygen, water quality deterioration, and degradation of the water ecosystem function, which is not conducive to the utilization of regional water resources and the protection of water ecological environment. Therefore, it is urgent to treat and repair the pollution of small water bodies in polders in plain river network areas. However, due to the deficiencies of small water bodies such as blocked water volume exchange, poor water self-purification ability, and poor water environment quality inside and outside the polders, the existing ecological water conservancy treatment technologies are not applicable to small water bodies in polders in plain river network areas. Summary of the Invention

[0003] The purpose of this application is to provide an ecological water conservancy restoration method applicable to the improvement of water environment in agricultural polder areas, which can solve the problems of blocked water circulation and degraded water ecological environment of small water bodies in agricultural polder areas.

[0004] To achieve the above purpose, this application provides an ecological water conservancy restoration method applicable to the improvement of water environment in agricultural polder areas. The agricultural polder area includes farmland, ecological ponds, and ditches; one or more adaptive water body micro-motion restoration devices for purifying water quality are arranged in the ecological ponds; an ecological landscape water diversion channel system and a waterfall ladder type bio-hydraulic collaborative enhanced purification system are set along the shore under the lake-circling road on the shore of the ecological pond. The ecological landscape water diversion channel system is used to purify the flowing water through aquatic plants; the waterfall ladder type bio-hydraulic collaborative enhanced purification system includes a horizontal top plate and several levels of step structures connected to the lower end of the horizontal top plate. Each level of step structure includes an inclined surface and a horizontal step surface connected to the bottom end of the inclined surface. The inclined surface is a cement board covered with holes; water guiding baffles are arranged at both ends of the horizontal top plate and each horizontal step surface. The water guiding baffle at one end of the horizontal top plate is an angle-adjustable water guiding baffle. The above method is applied to the non-flood season without irrigation and includes: (1) Collect the hydrological and water quality monitoring data of the ecological ponds and ditches and send them to the remote central control system; (2) The central control system judges the water quality classification of the ecological ponds and ditches and judges whether the water volume in the agricultural polder area is sufficient according to the monitoring data, and executes the following according to the judgment results: (2-1) When the water quality classifications of both the ecological pond and the ditch are of inferior Class V but the water volume is sufficient, the central control system executes: controlling the start of the adaptive water body micro-motion repair device, and controlling the pump-gate system to sequentially introduce the water in the ecological pond into the ecological landscape water diversion channel system and the waterfall ladder type bio-hydraulic collaborative enhanced purification system for purification; when it is monitored that the water quality in the ecological pond reaches the preset target water quality, then controlling the pump-gate system to introduce the water in the ecological pond into the ditch and making the water circulate in the ecological pond and the ditch, and controlling the water flow velocity to be not less than 0.02 m / s; (2-2) When the water quality classifications of both the ecological pond and the ditch are of inferior Class V but the water volume is insufficient, the central control system executes: controlling the pump-gate system to introduce external water into the ecological pond, and when it is monitored that the water level in the ecological pond reaches the preset water quality purification water level, then executing (2-1); (2-3) When the water quality classifications of both the ecological pond and the ditch are of Class IV-V, the central control system executes: starting the adaptive water body micro-motion repair device, controlling the pump-gate system to introduce the water in the ecological pond into the ditch and making the water circulate in the ecological pond and the ditch, and controlling the water flow velocity to be not less than 0.02 m / s; (2-4) When the water quality in the ecological pond reaches the target water quality but the water quality in the ditch does not reach the target water quality, guide baffles are arranged in advance at intervals along the water flow direction in the ditch, and a recycling purification basket is placed or not placed between adjacent guide baffles. The central control system then executes: controlling the pump-gate system to introduce the water in the ecological pond into the ditch and making the water circulate in the ecological pond and the ditch, and controlling the water flow velocity to be not less than 0.02 m / s.

[0005] In some embodiments, the adaptive water body micro-motion repair device includes a central platform, one or more ecological floating islands connected to the central platform through main aeration pipes, an aerator, a navigation controller, a power storage unit, a solar unit connected to the power storage unit, a transceiver unit, and a flow-pushing device provided on the central platform; The navigation controller is used to control the traveling direction of the flow-pushing device. The flow-pushing device is used to drive the adaptive water body micro-motion repair device to travel in a specified direction. The aerator is used to receive the instructions of the central control system through the transceiver unit and control the start-stop and aeration volume of each main aeration pipe according to the instructions.

[0006] In some embodiments, the ecological landscape water diversion channel system includes a first pond, a second pond, and a third pond arranged in sequence along the shore, and aquatic plants planted in the first pond, the second pond, and the third pond. The tops of the first pond, the second pond, and the third pond decrease in sequence, and the water depths in the first pond, the second pond, and the third pond increase gradually; floating plants and / or emergent plants are planted in the first pond, and one or more of floating plants, emergent plants, and submerged plants are planted in the second pond, and one or more of floating plants, emergent plants, and submerged plants are planted in the third pond.

[0007] In some embodiments, the inclined plane in the cascade biological-hydraulic synergistic enhanced purification system forms an angle of 100° to 120° with the horizontal roof plate.

[0008] In some embodiments, the cascade biological-hydraulic synergistic enhanced purification system further includes vertical walls arranged on both sides and a pressure water pipe installed at the rear. The pressure water pipe passes through the two vertical walls; there are water spray holes on the pressure water pipe facing the inclined plane. The water in the ecological pond is introduced into the pressure water pipe and then sprayed onto the inclined plane through the water spray holes.

[0009] In some embodiments, in (2-1) and / or (2-3), it further includes: guiding baffle plates are arranged at intervals along the water flow direction in the ditch, and a recovery and purification basket is placed or not placed between adjacent guiding baffle plates. The water in the ditch is further purified through the guiding baffle plates and / or the recovery and purification basket.

[0010] In some embodiments, in (2-1) and / or (2-3), it further includes: diverting the water in the ditch to the farmland. Part of the pollutants are intercepted by the farmland to achieve the purpose of further purification.

[0011] In (2-2), when the water quality of the external water body is inferior to the target water quality, the central control system controls the pump-gate system to divert the external water body to the cascade biological-hydraulic synergistic enhanced purification system for purification; when it is not inferior to the target water quality, the central control system controls the pump-gate system to directly introduce the external water body into the ecological pond.

[0012] Furthermore, it further includes: when the central control system determines according to the hydrological monitoring data that the water level in the polder area reaches the preset warning water level, it controls the pump-gate system to prevent the external water body from being introduced into the ecological pond and the ditch and increase the drainage volume.

[0013] Furthermore, it further includes: during the irrigation period, water blocking piers are arranged in advance at the end of the field ditch, guiding baffle plates are arranged at intervals along the water flow direction in the ditch, and a recovery and purification basket is placed or not placed between adjacent guiding baffle plates. Then: the central control system controls the pump-gate system to introduce the external water body into the ecological pond. When the water level in the ecological pond reaches the preset irrigation water level, it further controls the pump-gate system to introduce the water in the ecological pond into the ditch, and the water is transported to the farmland through the ditch for irrigation.

[0014] In some embodiments, the pump-gate system includes: a first ditch control gate and a ditch drainage gate respectively arranged at the water inlet and outlet of the ditch; an ecological pond drainage gate arranged at the connection between the ecological pond and the external water body; an ecological pond control gate arranged at the connection between the ditch and the ecological pond; a second ditch control gate arranged at the connection between the ditches; and a water pump arranged as needed. The control pump-gate system sequentially introduces the water in the ecological pond into the ecological landscape water diversion channel system and the cascade biological-hydrodynamic collaborative enhanced purification system for purification, including: controlling the opening of the water-lifting pump installed beside the ecological landscape water diversion channel system to introduce the water in the ecological pond into the ecological landscape water diversion channel system; The control pump-gate system introduces the water in the ecological pond into the ditch and makes the water circulate in the ecological pond and the ditch, including: controlling the opening of the ecological pond sluice gate and the second ditch sluice gate; The control pump-gate system introduces the external water body into the ecological pond, including: controlling the opening of the ecological pond drainage sluice gate and the water-lifting pump installed at the ecological pond drainage sluice gate; The central control system controls the pump-gate system to introduce the external water body to the cascade biological-hydrodynamic collaborative enhanced purification system for purification, including; controlling the opening of the ecological pond drainage sluice gate and the water-lifting pump installed at the ecological pond drainage sluice gate to introduce the external water body to the water conveyance channel pre-constructed in the ecological pond, controlling and adjusting the angle of the angle-adjustable water guide baffle, and opening the connection channel between the water conveyance channel and the cascade biological-hydrodynamic collaborative enhanced purification system; The central control system executes the control of the pump-gate system to directly introduce the external water body into the ecological pond, including: controlling the opening of the ecological pond drainage sluice gate and the water-lifting pump installed at the ecological pond drainage sluice gate to introduce the external water body to the water conveyance channel and introducing it into the ecological pond through the water conveyance channel; The water conveyance channel connects the external water body with the ecological pond and the cascade biological-hydrodynamic collaborative enhanced purification system, and the connection channel with the cascade biological-hydrodynamic collaborative enhanced purification system is opened or closed through the angle-adjustable water guide baffle.

[0015] Compared with the prior art, the present application has the following characteristics: The present application is proposed for the small water bodies in agricultural polder areas with deficiencies such as blocked water volume exchange, poor water self-purification ability, and poor water environment quality inside and outside the polder area. On the premise of fully ensuring flood control and drought resistance, the ecological water conservancy restoration method of the present application can effectively improve the water environment quality of the small water bodies in agricultural polder areas; and the present application can use the central control system for intelligent water conservancy regulation, and can realize intelligent ecological water conservancy restoration. Brief Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the agricultural polder area in the embodiment; Figure 2 It is a schematic layout diagram of the ecological landscape water diversion channel system and the cascade biological-hydrodynamic collaborative enhanced purification system in the embodiment; Figure 3 It is a schematic structural diagram of the ecological landscape water diversion channel system in the embodiment; Figure 4 It is a schematic structural diagram of the cascade biological-hydrodynamic collaborative enhanced purification system in the embodiment; Figure 5 Schematic diagram of the specific structure of the adaptive water body micro-motion repair device in the embodiment; Figure 6 Schematic diagram of the specific structure of the ecological floating island in the embodiment; Figure 7 Schematic diagram of the layout position of the water blocking pier in the embodiment; Figure 8 Schematic diagram of the specific structure of the water blocking pier in the embodiment; Figure 9 Schematic diagram of the layout positions of the diversion baffle and the recovery and purification basket in the embodiment; Figure 10 Schematic diagram of the specific structure of the diversion baffle in the embodiment; Figure 11 Schematic diagram of the specific structure of the recovery and purification basket in the embodiment; Figure 12 Schematic diagram of the process of the ecological water conservancy repair method in the embodiment.

[0017] Reference numerals: Agricultural polder area 100, farmland 110, ecological pond 120, first ecological pond 120a, second ecological pond 120b, ditch 130, first ditch 130a, second ditch 130b, third ditch 130c, fourth ditch 130d, check gate 140, first check gate 141, second check gate 142, third check gate 143, fourth check gate 144, fifth check gate 145, drainage sluice 150, first drainage sluice 151, second drainage sluice 152, third drainage sluice 153, water lifting pump 160, first water lifting pump 161, second water lifting pump 162, third water lifting pump 163, fourth water lifting pump 164, lakeside road 170, first water conveyance canal 181, second water conveyance canal 182, annular water inlet canal 190; Ecological landscape water diversion channel system 200, first pond 210, second pond 220, third pond 230; Waterfall ladder type biological-hydraulic collaborative enhanced purification system 300, horizontal roof 310, inclined plane 320, horizontal step surface 330, water guide baffle 340, angle-adjustable water guide baffle 340a, pressure water pipe 350, control valve 360, rotary valve 370, water turbine generator 380; Adaptive water body micro-motion repair device 400, first adaptive water body micro-motion repair device 400a, second adaptive water body micro-motion repair device 400b, central platform 410, ecological floating island 420, frame 421, sleeve 422, Aco-man ecological base 423, sub-aeration pipe 424, aeration propeller 425, aerator 430, navigation controller 440, power storage unit 450, solar unit 460, transceiver unit 470, main aeration pipe 480, pusher 491, connecting rod 492, impeller 493, guide vane 494; Ditch hydrodynamic improvement and nutrient recovery system 500, overflow baffle 510, water blocking pier 520, geotextile 521, diversion baffle 530, recovery and purification basket 540, guardrail 541, detachable bottom plate 542, rattan basket 543, carrying handle 544; Hydrological and water quality monitoring system 600, current meter 610, monitoring room 700. Specific implementation manner

[0018] The specific implementation manner and the technical effects generated by the present application will be clearly and completely described below in combination with the embodiments and the drawings to fully understand the purpose, features and effects of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present application.

[0019] The ecological water conservancy restoration method of the present application can be applied to typical agricultural polder areas, mainly used for ecological water conservancy regulation and reduction of nitrogen and phosphorus in typical agricultural polder areas. The agricultural polder area is located along lakes or rivers and generally includes farmland, ditches and ecological ponds. Please refer to Figure 1 , which shows a schematic diagram of the agricultural polder area in this embodiment. In this embodiment, the agricultural polder area 100 includes farmland 110, the first ecological pond 120a, the second ecological pond 120b, and the first ditch 130a, the second ditch 130b, the third ditch 130c, the fourth ditch 130d; the first ecological pond 120a and the second ecological pond 120b are close to the external water body and connected to the external water body; the first ditch 130a, the second ditch 130b, the third ditch 130c, the fourth ditch 130d are connected in sequence. Among them, the water inlet of the first ditch 130a and the water outlet of the third ditch 130c are both connected to the external water body. The external water body can be introduced into the ditch through the first ditch 130a, and the water flow in the ditch can be discharged through the third ditch 130c. The first ecological pond 120a and the second ecological pond 120b are connected to the nearby ditches. In this embodiment, the first ecological pond 120a is connected to the first ditch 130a, and the second ecological pond 120b is connected to the first ditch 130a and the fourth ditch 130d.

[0020] In this embodiment, the pump-gate system of the agricultural polder area includes: A first sluice gate 141 is arranged at the water inlet of the first ditch 130a, a second sluice gate 142 is arranged at the connection between the second ecological pond 120b and the first ditch 130a, a third sluice gate 143 is arranged at the connection between the second ditch 130b and the third ditch 130c, a fourth sluice gate 144 is arranged at the connection between the first ecological pond 120a and the first ditch 130a, and a fifth sluice gate 145 is arranged at the connection between the first ecological pond 120a and the fourth ditch 130d. A first drainage sluice 151 is arranged at the water outlet of the third ditch 130c, a second drainage sluice 152 is arranged at the connection between the first ecological pond 120a and the external water body, and a third drainage sluice 153 is arranged at the connection between the second ecological pond 120b and the external water body. In addition, a first water pump 161 is arranged at the fourth sluice gate 144, and a second water pump 162 is arranged at the third drainage sluice 153.

[0021] In the present application, the pump-gate system includes: The first ditch sluice gate and the ditch drainage sluice respectively arranged at the water inlet and the water outlet of the ditch 130, both of which are connected to the external water body; in this embodiment, the first sluice gate 141 is the first ditch sluice gate, and the first drainage sluice 151 is the ditch drainage sluice; The ecological pond drainage sluice arranged at the connection between the ecological pond 120 and the external water body; in this embodiment, the second drainage sluice 152 and the third drainage sluice 153 are the ecological pond drainage sluices; The ecological pond sluice gate arranged at the connection between the ditch 130 and the ecological pond 120; in this embodiment, the second sluice gate 142, the fourth sluice gate 144, and the fifth sluice gate 145 are the ecological pond sluice gates; The second ditch sluice gate arranged at the connection between the ditches; in this embodiment, the third sluice gate 143 is the second ditch sluice gate; The water pump arranged as required.

[0022] In the present application, the ecological water conservancy restoration of the agricultural polder area is mainly carried out through the coordination of the ecological landscape water diversion channel system, the waterfall ladder type bio-hydrodynamic synergistic enhanced purification system, the adaptive water body micro-motion restoration device, the ditch hydrodynamic improvement and nutrient recovery system, the hydrological and water quality monitoring system, and the central control system, etc.

[0023] Next, the specific structures and working principles of the ecological landscape water diversion channel system, the waterfall ladder type bio-hydrodynamic synergistic enhanced purification system, the adaptive water body micro-motion restoration device, the ditch hydrodynamic improvement and nutrient recovery system, the hydrological and water quality monitoring system, and the control method of the central control system will be described in detail with reference to the accompanying drawings respectively.

[0024] I. Ecological Landscape Water Diversion Channel System An ecological landscape water diversion channel system 200 is set on the bank of the ecological pond 120. The ecological landscape water diversion channel system 200 is located below the lakeside road 170 of the ecological pond 120 and is set at a position 2m - 3m below the lower end of the drop - aeration of the first water conveyance channel 181. For details, please refer to Figure 2 as shown. In this embodiment, two ecological landscape water diversion channel systems 200 are symmetrically set on the bank of the ecological pond 120.

[0025] For a specific structure of the ecological landscape water diversion channel system 200, please refer to Figure 3 , which includes a first pool 210, a second pool 220, and a third pool 230 arranged in sequence along the water flow direction, and aquatic plants planted in the first pool 210, the second pool 220, and the third pool 230. The aquatic plants are used to purify the water flowing through the ecological landscape water diversion channel system 200; the tops of the first pool 210, the second pool 220, and the third pool 230 are sequentially lowered, so that the water flows through the first pool 210, the second pool 220, and the third pool 230 in sequence; and the water depths in the first pool 210, the second pool 220, and the third pool 230 increase gradually. Different water depths are set in the first pool 210, the second pool 220, and the third pool 230. The purpose is to be suitable for the growth of different types of aquatic plants, form different redox environments in the water body, be conducive to the growth of aerobic, facultative anaerobic, and anaerobic microorganisms in the water body, promote the aerobic oxidative degradation of nitrogen and phosphorus under shallow water conditions, and the anaerobic mineralization in deep water, and increase the removal effect of nitrogen and phosphorus in the water body.

[0026] In this embodiment, floating plants and / or emergent plants are planted in the first pool 210, and one or more of floating plants, emergent plants, and submerged plants are planted in the second pool 220, and one or more of floating plants, emergent plants, and submerged plants are planted in the third pool 230. When selecting the aquatic plants to be planted, aquatic plants with strong nitrogen and phosphorus absorption ability in local aquatic plant species are preferably selected.

[0027] In this embodiment, a water conveyance channel is constructed on the bank of the ecological pond 120, such as the first water conveyance channel 181. A water - lifting pump, such as the fourth water - lifting pump 164, is arranged at one end of the water conveyance channel. The water - lifting pump is used to introduce the water in the ecological pond 120 into the water conveyance channel; the other end of the water conveyance channel is near the ecological landscape water diversion channel system 200, and its water outlet flows into the ecological landscape water diversion channel system 200, such as flowing into the first pool 210.

[0028] II. Cascade - type biological - hydraulic synergistic enhanced purification system Under the annular water inlet channel 190 of the ecological pond 120, two cascade biological-hydraulic synergistic enhanced purification systems 300 are symmetrically arranged. The two cascade biological-hydraulic synergistic enhanced purification systems 300 are respectively located at the lower positions of the water flows of the two ecological landscape water diversion channel systems 200. The water flow purified by the cascade biological-hydraulic synergistic enhanced purification system 300 falls into the ecological pond 120. For the specific structure of the cascade biological-hydraulic synergistic enhanced purification system 300, please refer to Figure 4 , which includes a horizontal top plate 310 and a number of step structures connected to the lower end of the horizontal top plate 310. Each step structure includes an inclined surface 320 and a horizontal step surface 330 connected to the bottom end of the inclined surface 320; the inclined surface 320 is a cement board covered with holes, and forms an angle of 100°-120° with the horizontal top plate 310. The holes distributed on the inclined surface 320 can provide a habitat for microorganisms and can purify the water flow passing through the inclined surface 320 by microorganisms. Water guiding baffles 340 are arranged at both side ends of the horizontal top plate 310 and each horizontal step surface 330.

[0029] The water guiding baffles 340 are used to restrict the water flow direction and prevent the water flow from overflowing, so that the water flow can flow down sequentially along a number of step structures. Among them, the water guiding baffle at one side end of the horizontal top plate 310 is an angle-adjustable water guiding baffle 340a, and its included angle with the horizontal top plate 310 is adjustable. The water flow enters from this side end of the horizontal top plate 310. Specifically, when the included angle between the angle-adjustable water guiding baffle 340a and the horizontal top plate 310 is 135°-180°, the water flow is introduced at the angle-adjustable water guiding baffle 340a and flows down sequentially along a number of step structures; when the included angle between the angle-adjustable water guiding baffle 340a and the horizontal top plate 310 is 90°, the water flow introduction is blocked.

[0030] The preferred scheme of the cascade biological-hydraulic synergistic enhanced purification system in this embodiment is: It also includes vertical walls (not marked in the figure) arranged on both sides and a pressure water pipe 350 installed at the rear. The pressure water pipe 350 passes through the two vertical walls and is installed on the vertical walls. The pressure water pipe 350 is provided with water spraying holes facing the inclined surface 320. The water in the ecological pond 120 is introduced into the pressure water pipe 350, and then high-pressure water flow is sprayed onto the inclined surface 320 through the water spraying holes to wash the inclined surface 320. The start and stop of the pressure water pipe 350 are controlled by a control valve 360.

[0031] Furthermore, in order to clean the inclined surface 320 more comprehensively, the pressure water pipe 350 can be rotated in this embodiment. Specifically, a rotary valve 370 is installed on the pressure water pipe 350, and the rotary valve 370 drives the pressure water pipe 350 to rotate to change the orientation of the water spraying holes. Still further, a water turbine generator 380 is also installed at the bottom end. The water flow falls to the water turbine generator 380, and the water flow head drives the water turbine generator 380 to generate electricity, which is used to provide electrical energy for the pressure water pipe 350.

[0032] In this embodiment, the horizontal roof 310, the vertical wall, the inclined surface 320 and the horizontal step surface 330 are all made of cement. The dimensions of the horizontal roof 310 are: length 1.5 m to 2 m, width 0.5 m to 0.8 m.

[0033] The working principle of the waterfall-step type bio-hydrodynamic synergistic enhanced purification system 300 in this embodiment will be provided below: The water surface of the ecological pond 120 is located below the waterfall-step type bio-hydrodynamic synergistic enhanced purification system 300, and the bottom edge of the step structure maintains a drop of at least 1 m from the water surface of the ecological pond 120. Water flows downward step by step from the horizontal roof 310 and finally falls into the ecological pond 120. The water guide baffles 340 at both ends of each step are used to prevent water from overflowing. When the water inflow is large, the water flow directly reaches the horizontal step surface 330 of the next-step structure from the edge of the horizontal step surface 330 of the previous-step structure, which can increase the contact area and time between the water flow and the air and improve the oxygen content in the water flow. When the water inflow is small, the water flow flows along the inclined surface 320 of the step structure, which can extend the hydraulic retention time of the water flow on the inclined surface 320. The microorganisms inhabiting the holes on the inclined surface 320 can purify the water flow and improve the self-purification ability of the water body.

[0034] III. Adaptive water body micro-motion repair device One or more adaptive water body micro-motion repair devices 400 are placed in the ecological pond 120 for cruising. In this embodiment, the first adaptive water body micro-motion repair device 400a is placed in the first ecological pond 120a, and the second adaptive water body micro-motion repair device 400b is placed in the second ecological pond 120b. The adaptive water body micro-motion repair device 400 is used to aerate the areas with substandard water quality in the ecological pond 120 according to the received instructions to purify the water quality. For the specific structure of the adaptive water body micro-motion repair device 400, please refer to Figure 5 , which includes a central platform 410, one or more ecological floating islands 420 connected to the central platform 410 through a main aeration pipe 480, an aerator 430, a navigation controller 440, a power storage unit 450, a solar unit 460 connected to the power storage unit 450, a transceiver unit 470, and a flow-pushing device provided on the central platform 410.

[0035] The flow-pushing device is used to control the adaptive water body micro-motion repair device 400 to sail in a specified direction, and further includes a flow-pushing machine 491, a connecting rod 492, an impeller 493, and a guide vane 494 connected to the impeller 493, which are arranged on the central platform 410; one end of the connecting rod 492 is connected to the flow-pushing machine 491, and the other end is connected to the impeller 493. The aerator 430 is used to receive instructions from the central control system through the transceiver unit 470 and control the start-stop and aeration volume of each main aeration pipe 480 according to the instructions; the navigation controller 440 is used to control the flow-pushing device to make the adaptive water body micro-motion repair device 400 travel in a specified direction. In this embodiment, the traveling speed of the adaptive water body micro-motion repair device 400 is controlled to be 0.05 m / s - 0.1 m / s.

[0036] Next, a specific ecological floating island structure diagram will be provided. Please refer to Figure 6 , the ecological floating island 420 includes a frame 421, a sleeve 422 arranged on the upper part of the frame 421, an Akeman ecological base 423 arranged on the lower part of the frame 421, and a sub-aeration pipe 424 arranged on the frame 421, and an aeration pusher 425 installed at the bottom end of the sub-aeration pipe 424. Among them, the sub-aeration pipe 424 is connected to the main aeration pipe 480. Plants or adsorption materials are planted or placed in the sleeve 422, which is above the water surface; the Akeman ecological base 423 is under the water surface and is used for biofilm micro-treatment of the water body.

[0037] IV. Ditch hydrodynamic improvement and nutrient recovery system The ditch hydrodynamic improvement and nutrient recovery system 500 is mainly arranged in the ditch 130 and is used to purify the water body flowing in the ditch 130. The ditch hydrodynamic improvement and nutrient recovery system 500 of the present application mainly includes a water blocking pier 520, a diversion baffle 530, and a recovery and purification basket 540. Please refer to Figure 7 , as shown in the schematic layout position diagram of the water blocking pier, the water blocking pier 520 is arranged in the field ditch. In this embodiment, the overflow baffle 510 is arranged on both sides of the field ditch, and the top of the overflow baffle 510 is higher than the water level of the field ditch to confine the water body in the field ditch and prevent the water in the field ditch from overflowing; the water blocking pier 520 is arranged at the end of the field ditch.

[0038] For the specific structure of the water blocking pier, please refer to Figure 8, which is composed of one or more of gravel, pebbles, and blocks, with a particle size of 2cm~60cm; 1~2 layers of impermeable or weakly permeable geotextiles 521 are sandwiched in the middle of the water blocking pier 520, and the two sides of the water blocking pier 520 are symmetrical and form a trapezoidal slope, and the slope of the trapezoidal slope is 1: (1.5-3). In this embodiment, an overflow baffle 510 is passed between the fields to form a field ditch with a width of about 0.5m between the fields, and water enters one end of the field ditch, and the water blocking pier 520 is arranged at the other end. The field elevation is modified so that the field elevation is successively reduced from the ecological pond 120 to the drainage gate, and the water flow from the ecological pond 120 enters the ditch 130 and is transported downstream by gravity.

[0039] The guide baffles 530 are arranged at intervals in the ditch 130. Figure 9 For its specific structure, see Figure 10 . The guide baffle 530 is mainly used to guide the direction of water flow and slow down the flow rate of water. Circular holes 531 are distributed on the guide baffle 530, and the apertures of the distributed circular holes 531 increase from bottom to top. The bottom end of the flow baffle 530 is sharp, which is convenient for insertion into the bottom of the ditch 130; the guide baffle 530 can be a permeable guide baffle. Furthermore, a first ring 532 is also arranged on one side of the guide baffle 530, which can be mounted on a nearby wooden pile for fixation. Generally, during the non-flood season, the guide baffle 530 can be arranged in the ditch as needed; during the flood season, the guide baffle 530 is removed in advance. In some specific embodiments, the guide baffle 530 is made of wood, and the aperture of the circular holes 531 is 2cm~8cm.

[0040] The recycling and purification basket 540 is arranged between two adjacent guide baffles 530 to intercept floating objects and absorb nitrogen and phosphorus in the water body; and the two sides of the recycling and purification basket 540 should be at least 20 cm away from the boundary of the ditch 130 so as not to affect the drainage of the ditch. Figure 11 It includes a waterproof guardrail 541 at the bottom, a detachable bottom plate 542 arranged on the guardrail 541, a rattan basket 543 connected to the guardrail 541, and a hand ring 544 connected to the top of the rattan basket 543, and willow branches and / or other submerged plants are placed in the rattan basket 543.

[0041] When the water flows through the recycling and purification basket 540, the rattan basket 543 can intercept some floating objects, and the plants in the rattan basket 543 can absorb nitrogen and phosphorus in the water body, and at the same time can slow down the flow rate of the water flow, intercept more suspended matter, and some of the intercepted suspended matter settles to the bottom of the recycling and purification basket 540. The detachable bottom plate 542 is detachable, which is convenient for regular cleaning of settled silt. In specific implementation, the number of recycling and purification baskets 540 can be increased or decreased in the ditch according to the water quality conditions.

[0042] 5. Hydrology and water quality monitoring system The hydrological and water quality monitoring system 600 includes a hydrological monitoring unit and a water quality monitoring unit, which are respectively used to monitor the hydrological parameters and water quality parameters of water bodies and feedback them to the central control system in the remote monitoring room 700. It is arranged as needed. In this application, the water quality monitoring unit is generally arranged in the ecological pond 120 and / or the ditch 130. The hydrological monitoring unit is generally arranged at the end of the check gate 140, the drainage sluice 150, the water pumping pump 160, the ditch 130, etc. The monitored hydrological parameters may include water level data and / or flow velocity data, and the flow velocity data can be monitored by a current meter 610; the monitored water quality parameters may include data such as conductivity, dissolved oxygen, turbidity, ammonia nitrogen, total phosphorus, permanganate index, and chlorophyll.

[0043] VI. Central Control System The central control system is used to control the pump and sluice systems such as the drainage sluice, the water pumping pump, and the check gate, as well as the adaptive water body micro-motion repair device according to the monitored data of hydrology and water quality, and conduct ecological water conservancy repair on the agricultural polder area to achieve the purpose of improving the water environment of the agricultural polder area.

[0044] Next, taking the Figure 1 shown agricultural polder area as an example, the specific implementation process of the ecological water conservancy repair method of this application will be provided. This application can conduct ecological water conservancy repair in multiple scenarios.

[0045] It is necessary to preset the warning water level, irrigation water level, and water quality purification water level in advance, where the warning water level > irrigation water level ≥ water quality purification water level; the warning water level and irrigation water level are delimited according to the growth of crops and the needs of flood control and drainage in the agricultural polder area, generally given by the local relevant departments; the water quality purification water level is set in combination with the purification requirements of the agricultural polder area.

[0046] 1. Ecological water conservancy repair method during the flood season: The characteristics of the flood season are that the water level of the external water body rises rapidly, and the accumulated water volume in the polder area increases accordingly. During the flood season, the water in the polder area should be drained as soon as possible. When it is monitored that the water level in the polder area exceeds the warning water level, the central control system issues a water level alarm and executes: controlling the pump and sluice system to prevent the external water body from entering the ecological pond 120 and the ditch 130 and increasing the drainage volume. For this embodiment, a possible execution method is: controlling the third drainage sluice 153 to close to prevent the external water body from entering the second ecological pond 120b; opening the first drainage sluice 151, the second drainage sluice 152, and the first check gate 141; when necessary, starting the second water pumping pump 162 to increase the drainage volume of the first ecological pond 120a and drain the water in the polder area outside the polder. During the flood season, full cooperation should be given to the unified arrangement of flood control dispatching by the water conservancy department, close the hydrological and water quality monitoring system 600 and the adaptive water body micro-motion repair device 400, remove the diversion baffles 530 in the ditch 130, recycle the purification baskets 540, etc., to improve the flood discharge capacity of the ditch.

[0047] 2. Ecological water conservancy restoration method during the irrigation period: To meet the irrigation needs within the polder, the water level at the first drainage sluice 151 should be controlled to the irrigation water level. Specifically, the water level at the first drainage sluice 151 can be adjusted by controlling the first sluice gate 141 and the first drainage sluice 151. When the water level at the first drainage sluice 151 exceeds the irrigation water level, the central control system controls the third drainage sluice 153 to close.

[0048] To improve the nitrogen and phosphorus absorption capacity of the water quality within the polder and enhance the fertility of the farmland soil, the central control system also executes: By controlling the first water pump 161, the water in the first ecological pond 120a is pumped into the first ditch 130a and then transported to the farmland 110 through the first ditch 130a. At the same time, the method of step-by-step irrigation in the field is implemented for irrigation. Step-by-step irrigation in the field means that during irrigation, by arranging water blocking piers 520, the flow rate is slowed down, the hydraulic retention time in the farmland is extended, so that nitrogen and phosphorus are intercepted in the farmland as much as possible and absorbed by crops, in order to reduce the amount of fertilizer applied. At the same time, diversion baffles 530 and recovery and purification baskets 540 are placed in the ditch 130 to extend the retention time of the farmland drainage water and increase the aeration volume, further intercepting the farmland drainage water. Through this "microcirculation" within the polder, the dual effects of irrigation and water quality purification are achieved.

[0049] 3. Ecological water conservancy restoration method during the non-flood season: During the non-flood season when there is no need to irrigate the crops within the polder, the tiny water bodies within the polder are basically in a static state, with little water volume and the worst water self-purification ability, resulting in water quality deterioration. At this time, the water environment quality within the polder urgently needs to be improved. In this scenario, the specific implementation process of the ecological water conservancy restoration method of this application is referred to Figure 12 , including: The central control system judges the water quality classification of the ecological pond and the ditch according to the water quality monitoring data, and judges whether the water volume in the agricultural polder area is sufficient according to the hydrological monitoring data. When the water level in the ecological pond is higher than the preset water quality purification water level, it indicates that the water volume in the polder area is sufficient. According to the judgment results, the following is executed: (1) When the water quality classifications of both the ecological pond and the ditch are of inferior Class V but the water volume is sufficient, the central control system executes: Start the adaptive water body micro-motion restoration device 400 to purify the water quality in the ecological pond 120; control the pump gate system to sequentially introduce the water in the ecological pond 120 into the ecological landscape water diversion channel system 200 and the waterfall ladder type biological-hydraulic collaborative enhanced purification system 300 for purification; when it is monitored that the water quality in the ecological pond 120 reaches the preset target water quality, then control the pump gate system to introduce the water in the ecological pond 120 into the ditch 130 and make the water circulate between the ecological pond 120 and the ditch 130, and control the water flow velocity not to be lower than 0.02 m / s.

[0050] For this embodiment, a possible specific implementation method for the control pump-gate system to sequentially introduce the water in the ecological pond 120 into the ecological landscape water diversion channel system 200 and the waterfall ladder type bio-hydraulic collaborative enhanced purification system 300 for purification is as follows: Control and start the third water pump 163 to introduce the water in the ecological pond 120 into the first water conveyance channel 181. The first water conveyance channel 181 conveys the water flow to the stepped ecological landscape purification pond 200 for purification. Adjust the angle-adjustable water guide baffle 340a. The purified water flow is conveyed from one side of the horizontal roof 310 to the horizontal roof 310 through the second water conveyance channel 182. After being purified by the waterfall ladder type bio-hydraulic collaborative enhanced purification system 300, it finally falls into the ecological pond 120. At the same time, start the fourth water pump 164 to introduce the water in the ecological pond 120 into another stepped ecological landscape purification pond 200 for purification, and then convey it to another waterfall ladder type bio-hydraulic collaborative enhanced purification system 300.

[0051] For this embodiment, a possible specific implementation method for the control pump-gate system to introduce the water in the ecological pond 120 into the ditch 130 and make the water circulate in the ecological pond 120 and the ditch 130 is as follows: Control and start the first water pump 161 and the second water pump 162 to introduce the water in the first ecological pond 120a and the second ecological pond 120b into the first ditch 120a through the fourth sluice gate 144 and the second sluice gate 142. At the same time, by controlling the start and stop of the first sluice gate 141, the third sluice gate 143, and the fifth sluice gate 145, control the water volume in the ditch within the preset water volume value. At the same time, control the power of the first water pump 161 and the second water pump 162 to adjust the water flow velocity in the ditch 130 to be not less than 0.02 m / s. The high water flow velocity is beneficial to improving the self-purification ability of the water body in the polder area.

[0052] During this process, no external water body is introduced, and the water flow is kept flowing within the polder area until the water quality of the ecological pond and the ditch both reach the target water quality.

[0053] Furthermore, guide baffles 530 can be arranged at intervals along the water flow direction in the ditch 130, and recovery and purification baskets 540 can be placed or not placed between adjacent guide baffles 530 to further improve the self-purification ability of the water body in the ditch 130.

[0054] If after the above is executed, the water quality of the ecological pond and / or the ditch still does not reach the target water quality, then drain the water in the ditch 130 to the farmland 110, and use the farmland 110 to intercept part of the pollutants to achieve the purpose of further purification.

[0055] (2) When the water quality classifications of both the ecological pond and the ditch are inferior to Class V but the water volume is insufficient, the central control system executes: control the pump-gate system to introduce external water into the ecological pond, and when it is monitored that the water level of the ecological pond reaches the preset water quality purification water level, then execute (1); For this embodiment, a possible specific implementation method for the control pump-gate system to introduce external water bodies into the ecological pond is as follows: Start the second water-lifting pump 162 to introduce the external water body into the second ecological pond 120b to increase the water volume in the second ecological pond 120b. At the same time, open the first sluice gate 142, the third control valve 143, and the fifth control valve 145 to increase the water volume in the first ecological pond 120a, the second ecological pond 120b, and the ditch near the first drainage sluice 151, so that the water levels in the first ecological pond 120a and the second ecological pond 120b both reach the water quality purification level.

[0056] When the central control system determines based on the water quality monitoring data that the quality of the external water body is inferior to the water quality target, the central control system controls the pump-gate system to introduce the external water body to the cascade biological-hydrodynamic synergistic enhanced purification system 300 for purification; when it is not inferior to the target water quality, the central control system controls the pump-gate system to directly introduce the external water body into the ecological pond 120.

[0057] For this embodiment, a possible specific implementation method for the central control system to control the pump-gate system to introduce the external water body to the cascade biological-hydrodynamic synergistic enhanced purification system 300 is as follows: Control the pump-gate system to introduce the external water body into the second water conveyance channel 182, and convey it to the cascade biological-hydrodynamic synergistic enhanced purification system 300 by the second water conveyance channel 182.

[0058] For this embodiment, a possible specific implementation method for the central control system to control the pump-gate system to directly introduce the external water body into the ecological pond 120 is as follows: Control the pump-gate system to introduce the external water body into the second water conveyance channel 182, and directly enter the second ecological pond 120b from the drop-cascade aeration of the second water conveyance channel 182.

[0059] (3) When the water quality classification of both the ecological pond and the ditch is Class Ⅳ-Ⅴ, the central control system executes: Start the adaptive water body micro-motion restoration device 400, control the pump-gate system to introduce the water in the ecological pond into the ditch and make the water circulate in the ecological pond and the ditch, and control the water flow velocity not to be lower than 0.02 m / s; For this embodiment, a possible specific implementation method for controlling the pump-gate system to introduce the water in the ecological pond into the ditch and make the water circulate in the ecological pond and the ditch is as follows: Control to open the second control valve 142, the third control valve 143, the fourth control valve 144, and the fifth control valve 145. The water bodies in the first ecological pond 120a and the second ecological pond 120b enter the first ditch 130a and then flow through other ditches in sequence to maintain the microcirculation of the water body in the polder area; by controlling the opening degrees of the second control valve 142, the third control valve 143, the fourth control valve 144, and the fifth control valve 145, control the water level in the polder area and the water flow velocity in the ditch, and the flow velocity is maintained not to be lower than 0.02 m / s. According to the actual needs of controlling the water level and flow velocity in the polder area, open and close the water-lifting pump to accelerate the flow velocity or raise the water level.

[0060] Furthermore, guiding baffles 530 can be arranged at intervals along the water flow direction in the ditch 130, and a recycling and purification basket 540 can be placed or not placed between adjacent guiding baffles 530 to further improve the self-purification ability of the water body in the ditch 130.

[0061] If the water quality of the ecological pond and / or the ditch still fails to reach the target water quality after the above measures are taken, the water in the ditch 130 will be diverted to the farmland 110, and part of the pollutants will be intercepted by the farmland 110 to achieve the purpose of further purification.

[0062] (4)When the water quality in the ecological pond reaches the target water quality but the water quality in the ditch does not, guiding baffles are arranged in advance at intervals along the water flow direction in the ditch, and a recycling and purification basket is placed or not placed between adjacent guiding baffles. The central control system then executes: controlling the pump-gate system to introduce the water in the ecological pond into the ditch and making the water circulate between the ecological pond and the ditch, and controlling the water flow velocity to be not less than 0.02 m / s.

[0063] For this embodiment, the possible specific implementation manners for controlling the pump-gate system to introduce the water in the ecological pond into the ditch and making the water circulate between the ecological pond and the ditch are as follows: Open the second sluice gate 142, the third control valve 143, the fourth control valve 144, and the fifth control valve 145. The water in the first ecological pond 120a is introduced into the first ditch 130a and then flows through other ditches along the way to enhance the microcirculation of the water body. Control the opening degrees of the second sluice gate 142, the third control valve 143, the fourth control valve 144, and the fifth control valve 145, control the water levels in the first ecological pond 120a and the second ecological pond 120b, and control the water flow velocity in the ditch 130. The flow velocity should be kept not less than 0.02 m / s. According to the actual needs of water level and flow velocity control in the polder area, start or stop the lift pump to accelerate the flow velocity or raise the water level in the ditch.

[0064] This application can achieve multi-path ecological water conservancy restoration. According to the hydrological and water quality monitoring data, a suitable water conservancy regulation path is selected to reduce the actual operation cost. Generally speaking, when the required water replenishment volume in the polder area is small and the water quality is poor, such as in spring or autumn and winter, the water can be purified by the stepped biological purification ponds on both sides of the ecological pond and then enter the ecological pond; when the required water replenishment volume in the polder is large and the water quality is poor, such as in summer, the water can be purified by the stepped body waterfall stepped biological-hydrodynamic synergistic enhanced purification system on both sides of the ecological pond and then enter the ecological pond.

[0065] The above is a specific description of the preferred embodiment of this application, but the creation of this application is not limited to the described embodiment. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An ecological water conservancy restoration method suitable for improving the water environment in agricultural polder areas, characterized by: The agricultural polder area includes farmland, ecological ponds and ditches; one or more adaptive water body micro-motion repair devices for purifying water quality are arranged in the ecological pond; an ecological landscape water diversion channel system and a waterfall-type biological-hydraulic synergistic enhanced purification system are arranged along the shore under the lakeside road on the shore of the ecological pond, and the ecological landscape water diversion channel system is used to use aquatic plants to purify the water flowing through; the waterfall-type biological-hydraulic synergistic enhanced purification system includes a horizontal top plate and a plurality of step structures connected to the lower end of the horizontal top plate, each step structure includes an inclined surface and a horizontal step surface connected to the bottom end of the inclined surface, and the inclined surface is a cement board covered with holes; water guide baffles are arranged on both sides of the horizontal top plate and each horizontal step surface, and the water guide baffle at one side of the horizontal top plate is an angle-adjustable water guide baffle; The above methods are applied during the non-flood season when irrigation is not required, including: (1) Collect hydrological and water quality monitoring data from ecological ponds and ditches and send them to a remote central control system; (2) The central control system determines the water quality classification of ecological ponds and ditches based on the monitoring data and determines whether the water volume in the agricultural polder area is sufficient, and performs the following operations based on the judgment results: (2-1) When the water quality classification of the ecological pond and the ditch is inferior to Class V but the water volume is sufficient, the central control system executes: control to start the adaptive water body micro-motion repair device, control the pump gate system to sequentially introduce the water in the ecological pond into the ecological landscape water diversion channel system and the waterfall-type biological-hydraulic synergistic enhanced purification system for purification; when it is monitored that the water quality in the ecological pond reaches the preset target water quality, control the pump gate system to introduce the water in the ecological pond into the ditch and make the water circulate in the ecological pond and the ditch, and control the water flow rate to be no less than 0.02m / s; (2-2) When the water quality classification of the ecological pond and the ditch is inferior to Class V but the water volume is insufficient, the central control system executes: control the pump gate system to introduce external water into the ecological pond, and when the water level of the ecological pond reaches the preset water quality purification level, execute (2-1); (2-3) When the water quality classification of the ecological pond and the ditch is both Class IV-V, the central control system executes: start the adaptive water body micro-motion repair device, control the pump gate system to introduce water from the ecological pond into the ditch and make the water circulate in the ecological pond and the ditch, and control the water flow rate to be no less than 0.02m / s; (2-4) When the water quality in the ecological pond reaches the target water quality but the water quality in the ditch does not reach the target water quality, diversion baffles are pre-arranged in the ditch along the water flow direction, and recovery and purification baskets are placed or not placed between adjacent diversion baffles. The central control system then executes: controlling the pump gate system to introduce water from the ecological pond into the ditch and circulate the water in the ecological pond and the ditch, and controlling the water flow rate to be no less than 0.02m / s.

2. The ecological water conservancy restoration method for improving the water environment in agricultural polder areas as claimed in claim 1, characterized in that: The self-adaptive water body micro-motion repair device includes a central platform, one or more ecological floating islands connected to the central platform through a main aeration pipe, an aerator arranged on the central platform, a navigation controller, a power storage unit, a solar energy unit connected to the power storage unit, a transceiver unit, and a flow-pushing device; The navigation controller is used to control the driving direction of the flow-pushing device, the flow-pushing device is used to drive the adaptive water body micro-motion repair device to move in the specified direction, and the aerator is used to receive instructions from the central control system through the transceiver unit, and control the start and stop of each main aeration pipe and the aeration volume according to the instructions.

3. The ecological water conservancy restoration method for improving the water environment in agricultural polder areas as claimed in claim 1, characterized in that: The ecological landscape water diversion channel system includes a first pool, a second pool, and a third pool arranged in sequence along the coast, and aquatic plants planted in the first pool, the second pool, and the third pool. The tops of the first pool, the second pool, and the third pool are successively lowered, and the water depths in the first pool, the second pool, and the third pool are gradually increased; floating plants and / or emergent plants are planted in the first pool, one or more of floating plants, emergent plants, and submerged plants are planted in the second pool, and one or more of floating plants, emergent plants, and submerged plants are planted in the third pool.

4. The ecological water conservancy restoration method for improving the water environment in agricultural polder areas as claimed in claim 1, characterized in that: The waterfall-type biological-hydraulic synergistic enhanced purification system also includes vertical walls arranged on both sides and a pressure water pipe installed at the rear, and the pressure water pipe passes through the two vertical walls; the pressure water pipe is provided with a water spray hole facing the slope, and the water in the ecological pond is introduced into the pressure water pipe and then sprayed onto the slope through the water spray hole.

5. The ecological water conservancy restoration method suitable for improving the water environment in agricultural polder areas as claimed in claim 1, characterized in that: In (2-2), when the water quality of the external water body is inferior to the target water quality, the central control system controls the pump-gate system to lead the external water body to the waterfall-type biological-hydraulic synergistic enhanced purification system for purification; when it is not inferior to the target water quality, the central control system executes the control of the pump-gate system to directly lead the external water body into the ecological pond.

6. The ecological water conservancy restoration method suitable for improving the water environment in agricultural polder areas as claimed in claim 1, characterized in that: When the central control system determines that the water level in the polder area has reached the preset warning level based on the hydrological monitoring data, it controls the pump and gate system to prevent external water from entering the ecological pond and ditch and increase the drainage volume.

7. The ecological water conservancy restoration method suitable for improving the water environment in agricultural polder areas as claimed in claim 1, characterized in that: During the irrigation period, water blocking piers are arranged at the ends of the field ditches in advance, diversion baffles are arranged at intervals along the flow direction of the water in the ditch, and recovery and purification baskets are placed or not placed between adjacent diversion baffles. Afterwards: the central control system controls the pump gate system to introduce external water into the ecological pond. When the water level in the ecological pond reaches the preset irrigation water level, the pump gate system is controlled to introduce the water in the ecological pond into the ditch, which is then transported to the farmland for irrigation.

8. The ecological water conservancy restoration method suitable for improving the water environment in agricultural polder areas as claimed in claim 1, characterized in that: The pump-gate system includes: a first ditch regulating gate and a ditch drainage gate respectively arranged at the ditch water inlet and outlet; an ecological pond drainage gate arranged at the connection between the ecological pond and the external water body; an ecological pond regulating gate arranged at the connection between the ditch and the ecological pond; a second ditch regulating gate arranged at the connection between the ditch and the ditch; and a water pump arranged as needed; The control pump gate system sequentially introduces the water in the ecological pond into the ecological landscape water diversion channel system and the waterfall-type biological-hydraulic synergistic enhanced purification system for purification, including: controlling the opening of a water pump arranged beside the ecological landscape water diversion channel system to introduce the water in the ecological pond into the ecological landscape water diversion channel system; The control pump gate system introduces water from the ecological pond into the ditch and makes the water circulate in the ecological pond and the ditch, including: controlling the opening of the ecological pond control gate and the second ditch control gate; The control pump gate system introduces external water into the ecological pond, including: controlling the opening of the ecological pond drainage gate and the water pump arranged at the ecological pond drainage gate.

9. The ecological water conservancy restoration method suitable for improving the water environment in agricultural polder areas as claimed in claim 5, characterized in that: The pump-gate system includes: a first ditch regulating gate and a ditch drainage gate respectively arranged at the ditch water inlet and outlet; an ecological pond drainage gate arranged at the connection between the ecological pond and the external water body; an ecological pond regulating gate arranged at the connection between the ditch and the ecological pond; a second ditch regulating gate arranged at the connection between the ditch and the ditch; and a water pump arranged as needed; The central control system controls the pump gate system to guide the external water body to the waterfall-type biological-hydraulic synergistic enhanced purification system for purification, including: controlling the opening of the ecological pond drainage gate and the water pump arranged at the ecological pond drainage gate to guide the external water body to the water delivery channel pre-built in the ecological pond, controlling the angle of the water guide baffle with adjustable angle, and opening the connection channel between the water delivery channel and the waterfall-type biological-hydraulic synergistic enhanced purification system; The central control system executes the control of the pump gate system to directly introduce the external water body into the ecological pond, including: controlling the opening of the ecological pond drainage gate and the water pump arranged at the ecological pond drainage gate to lead the external water body to the water delivery channel and introduce it into the ecological pond through the water delivery channel; The water delivery channel connects the external water body with the ecological pond and the waterfall-type biological-hydraulic synergistic enhanced purification system, and the connection channel with the waterfall-type biological-hydraulic synergistic enhanced purification system is opened or closed by an angle-adjustable water guide baffle.

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