A Method and System for Ecological Interception Accounting and Carrying Capacity Transformation of Pump-Sluice Coupling in Plain Polder Areas

Abstract

The present invention relates to a method and system for ecological interception calculation and carrying capacity conversion of pump-sluice coupling in plain polder areas, comprising the following steps: Based on the hydraulic characteristics of strong hydrodynamic disturbance and sediment resuspension during centralized drainage in plain polder areas, a multi-level interception control system is configured in reverse along the main drainage system, with the centralized drainage pump station in the plain polder area as the radiation center; utilizing the physical enclosure of the plain polder area, the outlet is established as the controlled drainage monitoring section for material output from the plain polder area; the absolute interception reduction flux during the drainage cycle is calculated; the obtained interception reduction flux is input into the ecological carrying capacity conversion model of the enclosed water body, and the server continuously tracks the material output load per unit flow during the strong drainage pulse period. This invention employs a pulse integral algorithm coupled with pump-sluice operating conditions, avoiding the hardware cost and computational waste of a full-area gridded sensor deployment, effectively suppressing the secondary resuspension of sediment during centralized drainage, and improving the water quality stability within the polder area.

Description

Technical Field

[0001] This invention relates to the field of ecological and environmental engineering technology, specifically to a method and system for calculating and converting the ecological interception capacity of pump-sluice coupling in plain polder areas. Background Technology

[0002] Plain polder areas are widely distributed in the middle and lower reaches of the Yangtze River and around lakes in my country. Essentially, they are closed hydrological units formed by human construction of dikes on low-lying plains. Plain polder areas possess irreplaceable hydrological characteristics: flat terrain, external water systems completely physically isolated by dikes, and internal water networks lack both continuous downslope runoff due to natural gravity and continuous outflow baseflow. The drainage of internal floodwater and the outward transport of materials heavily rely on forced mechanical pumping stations deployed along the dike edges. Due to these unique characteristics, existing soil and water conservation monitoring and ecological value accounting technologies encounter common technical limitations in plain polder areas. The failure of the assumption of hydrological continuity leads to accounting bias. Traditional hydrological and soil erosion models, such as the Universal Soil Loss Equation (USLE) and SWAT, all assume that runoff and material transport occur with rainfall and continuously converge downhill. However, in plain polder areas, agricultural non-point source pollution and sediment typically exhibit "static retention and sedimentation" within the internal ditch and pond network. Once heavy rainfall triggers pump activation, the bottom sediment is severely disturbed, resulting in a step-like "pulse-like burst" of discharge concentration. Existing technologies, if employing continuous monitoring across the entire area over time, not only generate a large amount of invalid redundant data during the quiescent period but also fail to match the "pulse-like" hydrodynamic characteristics of polder areas, leading to distortions in the calculation of non-point source pollution interception and output flux.

[0003] Conventional physical protection mechanisms are mismatched with the unique power sources of polder areas. Traditional ecological revetment designs primarily address the downstream gravity erosion of natural rivers. However, in plain polder areas, the most severe soil erosion and water loss within the main river channel often occur the instant drainage pumping stations are activated. The enormous mechanical suction force generates a reverse hydraulic gradient at the bottom of the river channel, resuspending and extracting normally settled non-point source pollutants (i.e., the pump-suction resuspension effect). Existing conventional revetments lack reverse energy dissipation and control designs specifically tailored to this dynamic.

[0004] The value transformation of ecological products is detached from the physical capacity of real industries. Current valuation of ecological products (such as GEP accounting) generally employs the substitution cost method or the willingness-to-pay method, subjectively converting ecological indicators into abstract "monetary amounts." This kind of economic estimation, which remains merely at the reporting level, lacks the hard support of the physical carrying capacity of real industries and cannot objectively answer engineering questions such as "how much actual agricultural productivity will be increased or how much dredging and maintenance costs will be saved in the polder area after intercepting 100 tons of silt and nitrogen and phosphorus." This makes it difficult to truly transform the results of ecological governance into a solid data foundation for agricultural and cultural tourism assets, and the subsequent management and maintenance of ecological facilities (such as ecological ponds and revetments) also falls into a passive position due to the lack of demand-driven development from the industrial sector. Summary of the Invention

[0005] The method and system for ecological interception calculation and carrying capacity conversion of pump-sluice coupling in plain polder areas proposed in this invention can at least solve one of the technical problems in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A method for ecological interception calculation and carrying capacity conversion of pump-sluice coupling in plain polder areas includes the following steps: S1. Based on the hydraulic characteristics of strong hydrodynamic disturbance and resuspension of bottom sediment during centralized drainage in plain polder areas, a multi-level control system is configured in reverse along the main drainage system, with the centralized drainage pumping station in the plain polder area as the radiation center. S2. Taking advantage of the physical enclosure of the plain polder area, flow velocity meters and high-frequency water quality and sediment online analyzers are deployed only at centralized drainage pumping stations or sluice gates that connect to the external receiving water bodies. The data interface of the sensing equipment is linked with the programmable logic controller of the drainage pumping station to establish the outlet as the controlled drainage monitoring section for material output of the plain polder area. S3. Obtain the start / stop status of the drainage pumping station PLC in real time via the server as a Boolean variable. The absolute interception and reduction flux during this drainage cycle was calculated. S4. Input the interception and reduction flux calculated in step S3 into the ecological carrying capacity transformation model of the closed water body: Substitute the nitrogen and phosphorus interception and reduction amount into the eutrophication threshold control equation of the water body, and convert it into the quota of new characteristic benthic aquatic product stocking density allowed in the water body within the dike under the premise of maintaining water quality standards; Substitute the sediment interception and reduction amount into the riverbed sedimentation evolution model, and convert it into the number of days of dredging-free navigation guarantee to meet the safe draft of cultural and tourism vessels within the dike; Use the stocking density quota and the number of dredging-free guarantee days as the quantitative production capacity data base for verifying the development value of agricultural and cultural tourism franchise rights in the plain dike area; S5. The server continuously tracks the unit flow material output load during the strong discharge pulse period. When the rate of change of the actual output load exceeds the empirical threshold of the critical flow velocity for bottom sediment initiation, and when it is deduced that the aquaculture quota or the number of days without dredging in step S4 is close to the preset safety red line for industrial damage, the system initiates reverse hydraulic tracing based on the topology of the water network within the dike, locks the failed interception node, and generates a directional dredging or plant replanting maintenance work order containing spatial coordinates.

[0007] As a preferred embodiment of the method and system for ecological interception calculation and carrying capacity conversion of pump gate coupling in plain polder areas described in this invention, the barrier control system in step S1 includes a plant filter belt set at the junction of farmland drainage, an ecological pond at the drainage node, and a box-type ecological block revetment for the easily scour section of the main stream.

[0008] As a preferred embodiment of the method and system for ecological interception calculation and carrying capacity conversion of pump gate coupling in plain polder areas described in this invention, the box-type ecological block revetment adopts a prefabricated stepped porous box body, which is filled with a graded crushed stone reverse filter layer to reduce the reverse hydraulic shear stress generated by pump station suction during the concentrated drainage period and suppress the secondary suspension of the deposited eutrophic bottom sediment. The ecological pond is reinforced with anti-corrosion imitation wood piles, and emergent plant communities are planted on the bank slope and in the pond to delay and settle suspended particulate matter in the aquaculture runoff and the initial rainwater from the farmland.

[0009] As a preferred embodiment of the method and system for ecological interception accounting and carrying capacity conversion of pump-sluice coupling in plain polder areas described in this invention, the sensing devices in step S2 include an ultrasonic Doppler flow meter, a high-frequency online turbidity meter, and an online total nitrogen / total phosphorus analyzer; the server performs data spatiotemporal alignment and filtering noise reduction: synchronously interpolating the flow rate and water quality sampling frequency to the same time resolution. To address the burr noise signal generated by the sensor due to strong turbulence and bubbles under the drainage pump, the system's underlying layer applies adaptive Kalman filtering for smoothing and noise reduction, thereby obtaining high-precision instantaneous flow rate. With instantaneous concentration Time series.

[0010] As a preferred embodiment of the method and system for ecological interception calculation and carrying capacity conversion of pump-sluice coupling in plain polder areas described in this invention, wherein: during the forced drainage at startup in step S3... When the machine is stopped and recirculated, ; exist During this period, the system determined that the polder area was in a state of stagnant water and suspended the output flux calculation; exist Within the time window, the actual discharge load is calculated by discrete integration based on the instantaneous flow and concentration of the controlled drainage monitoring section; the difference is then made between this actual discharge load and the theoretical pulse discharge load derived from the preset plain polder background runoff baseline model.

[0011] As a preferred embodiment of the method and system for ecological interception calculation and carrying capacity conversion of pump-sluice coupling in plain polder areas described in this invention, the pulse-type flux discrete integral calculation based on the Boolean state of the pump filters out the static background data generated by the static internal circulation of water in the plain polder area during non-drainage periods through logic switches, and only performs flux calculation for the hydrodynamic output stage subject to artificial forced mechanical intervention.

[0012] As a preferred embodiment of the method and system for ecological interception calculation and carrying capacity conversion of pump gate coupling in plain polder areas described in this invention, the mapping method for the allowable increase in stocking density quota of characteristic benthic aquatic products in step S4 is as follows: taking the safe margin of the water environment capacity of the closed water body in the plain polder area as the constraint boundary, the chemical oxygen demand and ammonia nitrogen equivalent actually intercepted by the multi-level physical barrier network are divided by the life cycle pollution discharge coefficient of the specific aquatic product species to calculate the seedling release tail number index for expansion.

[0013] A system for coupled ecological interception accounting and carrying capacity conversion of pumping stations in plain polder areas includes: The internal physical barrier control module includes plant filter strips, ecological ponds and box-shaped ecological block revetments deployed in the plain polder water network, which are used to retain non-point source pollution from settled farmland during non-drainage periods and to buffer the disturbance of bottom sediment by mechanical suction during periods of heavy drainage. The controlled drainage monitoring module is deployed at the controlled drainage monitoring section of the drainage pumping station or culvert in the plain polder area. It is hardwired and linked with the control system of the drainage pumping station to synchronously wake up the high-frequency sampling work when the drainage command is issued. The pulse integral operation module includes a discrete integral algorithm coupled with the pump start-up and shut-down status, which is used to remove background redundant data during the still water period in the plain polder area and calculate the absolute interception and reduction flux of sediment and nitrogen and phosphorus within the time window of the forced discharge pulse. The carrying capacity mapping and management scheduling module is used to objectively convert the absolute interception and reduction flux into aquaculture quotas and cruise ship navigation dredging-free cycle indicators, generate the accounting base for franchise pricing, and generate targeted management instructions for specific internal nodes through topology reverse calculation when the carrying capacity indicator is detected to be approaching the safety threshold.

[0014] The beneficial effects of this invention are: This invention employs a pulse integral algorithm coupled with pump and gate operating conditions, avoiding the waste of hardware costs and computing power of full-area grid-based sensor deployment. The interception and reduction amount obtained has a rigorous hydrological basis. The reverse multi-level resistance control network set up to address the pump suction resuspension effect effectively suppresses the problem of secondary suspension of bottom sediment during the concentrated drainage period, and improves the water quality stability within the polder area. Attached Figure Description

[0015] Figure 1 This is the overall system logic diagram of the method and system for ecological interception calculation and carrying capacity conversion of pump gate coupling in plain polder areas according to the present invention.

[0016] Figure 2 This is a schematic diagram of the multidimensional health data monitoring of the method and system for ecological interception calculation and carrying capacity conversion of pump gate coupling in plain polder areas according to the present invention.

[0017] Figure 3 This is a logic block diagram of the hierarchical response module of the method and system for ecological interception calculation and carrying capacity conversion of pump gate coupling in plain polder areas according to the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0019] A method for ecological interception calculation and carrying capacity conversion of pump-sluice coupling in plain polder areas includes the following steps: S1. Based on the hydraulic characteristics of strong hydrodynamic disturbance and resuspension of bottom sediment during centralized drainage in plain polder areas, a multi-level control system is configured in reverse along the main drainage system, with the centralized drainage pumping station in the plain polder area as the radiation center. S2. Taking advantage of the physical enclosure of the plain polder area, flow velocity meters and high-frequency water quality and sediment online analyzers are deployed only at centralized drainage pumping stations or sluice gates that connect to the external receiving water bodies. The data interface of the sensing equipment is linked with the programmable logic controller of the drainage pumping station to establish the outlet as the controlled drainage monitoring section for material output of the plain polder area. S3. Obtain the start / stop status of the drainage pumping station PLC in real time via the server as a Boolean variable. The absolute interception and reduction flux during this drainage cycle was calculated. S4. Input the interception and reduction flux calculated in step S3 into the ecological carrying capacity transformation model of the closed water body: Substitute the nitrogen and phosphorus interception and reduction amount into the eutrophication threshold control equation of the water body, and convert it into the quota of new characteristic benthic aquatic product stocking density allowed in the water body within the dike under the premise of maintaining water quality standards; Substitute the sediment interception and reduction amount into the riverbed sedimentation evolution model, and convert it into the number of days of dredging-free navigation guarantee to meet the safe draft of cultural and tourism vessels within the dike; Use the stocking density quota and the number of dredging-free guarantee days as the quantitative production capacity data base for verifying the development value of agricultural and cultural tourism franchise rights in the plain dike area; S5. The server continuously tracks the unit flow material output load during the strong discharge pulse period. When the rate of change of the actual output load exceeds the empirical threshold of the critical flow velocity for bottom sediment initiation, and when it is deduced that the aquaculture quota or the number of days without dredging in step S4 is close to the preset safety red line for industrial damage, the system initiates reverse hydraulic tracing based on the topology of the water network within the dike, locks the failed interception node, and generates a directional dredging or plant replanting maintenance work order containing spatial coordinates.

[0020] The technical approach and underlying algorithm control logic of this invention will be described in detail below, using specific application scenarios in plain polder areas and a single panoramic implementation example. This embodiment unifies "agricultural and aquatic production capacity expansion, cost reduction for cultural tourism vessels, mathematical integral algorithm calculation, and adaptive management and traceability" into a single inventive concept to demonstrate the synergy and data transfer between the various modules of the system.

[0021] The target implementation area is set as a typical composite unit of the polder area in the lower reaches of the Yangtze River. The area is low-lying and flat, completely physically isolated by high-standard flood control dikes, and internally formed by a crisscrossing network of ancient waterways and contiguous polder fields. High-density contiguous aquaculture bases for benthic specialty aquatic products (such as ecological freshwater shrimp and river crabs) are planned within the area.

[0022] The surface runoff and farmland drainage within the polder area are typically in a state of stagnant water retention. Once heavy rainfall occurs and the water level reaches the flood control warning line, the drainage of internal floodwater and the output of materials to the outer river rely on the "central control drainage pumping station" and large river sluice gates deployed at the throat of the flood control dike for "forced mechanical pumping".

[0023] Step S1: Construct a multi-level physical barrier control network in the plain polder area to resist "pump-suction resuspension" disturbances. To address the unique hydraulic phenomenon in plain polder areas where non-point source pollution deposits internally during the "still water period" and is highly susceptible to reverse hydraulic shearing caused by the strong mechanical suction of drainage pumping stations during the "strong drainage period," resulting in secondary suspension of eutrophic sediment at the bottom layer (i.e., pump-suction resuspension effect), a reverse multi-stage physical barrier control is implemented: Plant filter strips and ecological ponds are laid out at the junction of farmland and aquaculture drainage ditches into tributary ditches. For example... Figure 2As shown, the slopes of abandoned pits and drainage ditches that the water must pass through are repaired. At the waterline, anti-corrosion imitation wood piles with a length of 4m and a diameter of 15cm (driven to a depth of 2.5m) are used to protect the slopes and stabilize the banks to prevent water erosion. Emergent plant communities with strong nitrogen and phosphorus absorption capacity, such as Thalia dealbata, Canna indica, and Acorus calamus, are planted in the ponds and on the banks to construct a source defense line to intercept the initial runoff and settle agricultural wastewater with high nitrogen and phosphorus content.

[0024] In sections of the main river channel that are close to the main control drainage pumping station and susceptible to direct impact from the powerful reverse suction hydraulic shear, box-type ecological block revetments are installed. For example... Figure 3 As shown, the revetment uses a precast C20 concrete base slab and a stepped, porous precast box-shaped wall. The back slope ratio is controlled at 1:0.3 to 1:0.5. The internal cavity of the box is not densely poured, but filled with a graded crushed stone filter layer with energy dissipation function and covered with soil and planted. At the moment the powerful drainage pump is started, this porous and permeable structure can effectively dissipate and absorb the reverse water flow wave energy transmitted backward along the bottom of the riverbed, rigidly pressing the non-point source pollutant sediment onto the bottom bed, and significantly reducing the amount of sediment lifted in the early stage of drainage.

[0025] Step S2: Establish controlled drainage monitoring sections and achieve spatiotemporal alignment of multi-source heterogeneous data: Taking advantage of the "funnel effect" where the physical boundary of the polder area is completely enclosed by the dike, the system centrally deploys industrial-grade ultrasonic Doppler flowmeters, high-frequency online turbidity meters, and online total nitrogen (TN) / total phosphorus (TP) analyzers only in the outlet channel of the only material output node, the "main control drainage pumping station" and the outlet sluice gate.

[0026] By directly connecting the hard-wired interfaces of the aforementioned sensing devices to the PLC hardware of the drainage pump unit, the unique "controlled drainage monitoring section" for closed-loop flux calculation was established. To ensure the accuracy of the integral calculation, the server first performs data spatiotemporal alignment and filtering noise reduction: the flow rate and water quality sampling frequencies are synchronously interpolated to the same time resolution. (For example, one data point per second or per minute); To address the burr noise signal generated by the sensor due to the strong turbulence and bubbles under the drainage pump, the system's underlying layer applies adaptive Kalman filtering for smoothing and noise reduction, obtaining high-precision instantaneous flow rate. With instantaneous concentration Time series.

[0027] Step S3: Perform pulsed flux discrete integral calculation based on the pump's Boolean state equation: The cloud server monitors the operating status of the drainage pumping station's PLC in real time and converts it into a Boolean state function. (1 during forced shutdown, 0 during shutdown), and execute the following dynamic accounting logic: During periods of still water, the filter is suspended: During periods of normal dry weather, the pump is shut down. The system determines that the polder area is in a static internal circulation stagnant state of physical settlement. The algorithm directly forces the external output flux equation to be suspended (set to zero), completely eliminating the large number of pseudo-runoff calculation errors generated during this period by the application of traditional hydrological continuous models.

[0028] Pulse calculation window activation and baseline virtual simulation: When heavy rainfall triggers urban flooding and pumps are activated for forced drainage ( When entering the "pulse time window," the system activates high-frequency sampling. The system first calls the plain polder runoff baseline model from the regional hydrogeographic database (setting a background state where the internal physical control network efficiency is zero). This is combined with the watershed rainfall for that drainage cycle. and the runoff and pollution generation coefficients of each land use type The baseline load of sediment discharged into the external river was theoretically calculated under the same operating conditions. (For example, theoretically estimated emissions of 1000 tons) and total baseline nitrogen load. (For example, theoretical calculations show a discharge of 5 tons).

[0029] Time delay compensation and actual discrete integral: Meanwhile, in time window To eliminate initial data interference caused by residual stagnant water in the pipeline and starting vortex in the tens of seconds before pump start-up, a hydraulic time delay compensation constant is introduced. In the corrected effective integration interval Inside, the server performs high-frequency discrete integral operations based on filtered data from controlled drainage monitoring sections:

[0030] Because the integral precisely matches the step-pulse hydrodynamic characteristics of the plain polder area, it can accurately capture the initial high-concentration "scour peak." Discrete integral results show that the actual amount of sediment discharged into the external river... t, the actual total amount of nitrogen discharged t.

[0031] Absolute cut-off amount stripping: The model performs interpolation liquidation on the above data ( The results show that during this period of intense discharge pulses, the internal multi-level physical control network actually intercepted and reduced 800 tons of sediment and 4 tons of total nitrogen. The absolute reduction flux for the whole year was obtained by accumulating the fluxes from each power-on pulse, generating underlying ecological data.

[0032] Step S4: Physical mapping of ecological interception flux to industrial environmental carrying capacity: like Figure 1 As shown in the process, the traditional approach of subjectively converting ecological indicators into currency, such as the willingness-to-pay method, is abandoned, and the aforementioned absolute interception and reduction of flux is directly implemented. Input the ecological carrying capacity transformation model and perform the mapping of real economy production capacity: Agricultural water environment capacity mapping: Based on the boundary control equations for the maximum allowable chemical oxygen demand (COD) and ammonia nitrogen environmental capacity of the enclosed water bodies in this plain polder area, the 4 tons of total nitrogen load intercepted and internally absorbed this time is mathematically equivalent to directly expanding the water body's environmental capacity safety margin against eutrophication. The system divides this safety capacity increment by the unit sewage discharge load coefficient within the life cycle of a specific aquatic product (such as ecological shrimp) to accurately calculate the absolute density quota for "adding 500,000 ecological shrimp larvae" within the polder this year, under the premise of maintaining the red line of no cyanobacterial blooms in the water body. This additional quota, as a real upper limit of agricultural physical production capacity, becomes the data foundation for determining the premium value of the ecological agriculture franchise and geographical indication products in this water area.

[0033] Mapping the navigation carrying capacity of cultural and tourism waterways: The interception and reduction flux of 800 tons of sediment is divided by the wet density of the bottom sediment to convert it into volume increment, which is then substituted into the dynamic evolution model of sedimentation in the main channel. Integral calculation shows that: because this part of the non-point source sediment is successfully intercepted and settled in the ecological pond, and does not enter the downstream cruise ship channel for deposition, the rate of sedimentation to the safe limit in the main cultural and tourism cruise ship channel is significantly slowed down, which can greatly extend the "dredging-free navigation guarantee period that meets the full-load draft of cruise ships" by 180 days. This physical indicator directly translates into a significant saving in mechanical dredging costs for cultural and tourism operating companies and a guarantee of six months of uninterrupted operation, which constitutes the capacity basis for the listing and pricing of the "water town cruise ship sightseeing franchise".

[0034] Step S5: Reverse topology tracing and adaptive maintenance triggering based on bearing capacity attenuation threshold: As time goes by, the plant filter belt will decay or the sediment in the front-end ecological pond will reach saturation, and the interception efficiency of the multi-level physical barrier control system will inevitably decline.

[0035] Based on historical pulse discharge data, the system continuously extracts the upward slope curve of the "unit flow material output load (i.e., the average actual discharge concentration)". When the system detects an abnormally steep increase in this upward slope (exceeding the empirical threshold of the critical flow velocity for bottom sediment initiation), causing the bottom eutrophic sediment to be re-extracted, and the carrying capacity mapping model predicts that: the "number of days for navigation without dredging" calculated in step S4 is continuously decreasing and about to fall below the industry safety red line that may cause cruise ships to run aground, or the "permitted aquaculture quota" is shrinking drastically and approaching the critical value that will cause water quality deterioration and lead to pond overflow; the system's carrying capacity mapping and management scheduling module immediately triggers an adaptive early warning mechanism. The system automatically calls the topological structure diagram of the graded confluence of water networks within the plain dike and uses a graph theory search algorithm to initiate reverse hydraulic source tracing calculations. By retrieving the variance characteristics of historical water quality fluctuations at the control nodes of each level of tributary, the system identifies the specific physical spatial source where the interception effectiveness has substantially collapsed (e.g., a severely silted ecological pond numbered #03, or a section of vegetation fence that is locally damaged).

[0036] The aforementioned process of initiating reverse hydraulic source tracing calculation using graph theory search algorithms is an existing technology. Specifically, it includes: the system abstracts the hierarchical water system network structure in the plain polder area into a mathematically directed graph model, using multi-level physical control facilities and water network confluences as vertices of the graph, and connected rivers and ditches and the direction of reverse flow as directed edges; when source tracing is initiated, the system uses the outlet section where abnormal load data is detected as the starting search root node, and uses breadth-first search (BFS) or depth-first search (DFS) graph traversal algorithms to trace upstream confluence branches level by level along the directed edges; in the reverse traversal operation, the algorithm uses the previously retrieved historical water quality variance characteristics of the nodes as state verification parameters, compares layer by layer and quickly prunes and excludes normal water system branches that have not undergone data mutations, and continues to reverse address along the connected edges with characteristic mutations until a match is found and the abnormal graph vertex with substantial decay in interception efficiency is locked, at which point the search terminates, and the spatial coordinates of the physically failed node are parsed and output.

[0037] Subsequently, the server automatically generates a "Directional Mechanical Dredging and Aquatic Plant Replanting and Maintenance Work Order" containing precise three-dimensional spatial coordinates and specific engineering quantity requirements (such as excavator entry for dredging 200m³ and replanting of canna lilies 50m²), and dispatches it to the construction team.

[0038] In addition, this invention also discloses a system for ecological interception calculation and carrying capacity conversion coupled with pumping stations in plain polder areas, comprising: The internal physical barrier control module includes plant filter strips, ecological ponds and box-shaped ecological block revetments deployed in the plain polder water network, which are used to retain non-point source pollution from settled farmland during non-drainage periods and to buffer the disturbance of bottom sediment by mechanical suction during periods of heavy drainage. The controlled drainage monitoring module is deployed at the controlled drainage monitoring section of the drainage pumping station or culvert in the plain polder area. It is hardwired and linked with the control system of the drainage pumping station to synchronously wake up the high-frequency sampling work when the drainage command is issued. The pulse integral operation module includes a discrete integral algorithm coupled with the pump start-up and shut-down status, which is used to remove background redundant data during the still water period in the plain polder area and calculate the absolute interception and reduction flux of sediment and nitrogen and phosphorus within the time window of the forced discharge pulse. The specific calculation logic is as follows: 1) Spatiotemporal alignment and filtering / noise reduction of multi-source heterogeneous data: The system integrates data from Doppler flow meters and high-frequency water quality and sediment online analyzers at controlled drainage monitoring sections, and reads the operating status instructions from the programmable logic controller (PLC) of the drainage pumping station. A timestamp alignment algorithm is introduced to synchronously interpolate the flow rate and water quality sampling frequencies to the same time resolution. To address the glitch signals generated by the sensor due to the strong turbulence and bubbles from the underwater pump, an adaptive Kalman filter is applied for smoothing and noise reduction to obtain high-precision instantaneous flow rate. With instantaneous concentration Time series.

[0039] 2) Dynamic determination of the integral time window based on Boolean state equations: Introducing a Boolean state function that is hard-coupled with the pump's start-up and shut-down states. As the core control operator, when the PLC issues a stop command... The system determines that the materials inside the polder are in a "static retention period" of physical settling, and directly forces the external output flux equation to zero; when the water level exceeds the limit and triggers the pump to discharge water, The system activates the "pulse calculation time window". To eliminate interference from residual stagnant water in the pipeline during the initial pump start-up phase and from starting vortices, a hydraulic time delay compensation constant is introduced into the system. The effective integration interval is precisely corrected to .

[0040] 3) Virtual extrapolation of theoretical emission baseline load: After triggering the pulse calculation time window, the system synchronously calls the plain polder runoff baseline model under the assumption of "no physical control network". This model integrates the watershed surface rainfall during the drainage cycle. Runoff and pollution generation coefficients for each land use type and catchment area The theoretical baseline load of non-point source pollution and sediment pulse emissions, without interception by ecological ponds and filter belts, was calculated under the same operating conditions and the same pumping volume. .

[0041] 4) High-frequency discrete integral calculation of actual emission flux: Within the corrected pulse calculation time window, the system calculates the actual emission flux based on the filtered instantaneous flow rate. and concentration discrete integration is performed. For the total actual discharge load the calculation function is: . This high-frequency discrete integration can accurately capture the "scouring peak" phenomenon of concentration caused by the "pumping resuspension effect" in the early stage of drainage, and truly reflect the dynamic material output under the disturbance of strong water flow.

[0042] 5) Stripping of absolute interception reduction and flux purification: when the pump shutdown command is issued, is reset to 0 and the current pulse period ends, the system settles the ecological interception efficiency of this period. Through the difference operation between the theoretical baseline load and the actual discharge load, that is , the mass of materials absolutely intercepted, digested and settled by the internal physical control network during this drainage period is accurately stripped. The annual are accumulated successively to generate the "net interception reduction flux" with strict hydrodynamic basis, which provides absolutely rigid data input for the subsequent industrial carrying capacity mapping.

[0043] The carrying capacity mapping and management and dispatching module is configured to objectively convert the absolute interception reduction flux into aquaculture stocking quotas and cruise navigation siltation-free cycle indicators, generate an accounting base for pricing of franchise rights, and when it is detected that the carrying capacity index approaches the safety threshold, generate directional management instructions for specific internal nodes through topological reverse calculation.

[0044] It should be noted that in this document, the terms "comprise", "include" or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article or apparatus. Without further limitation, an element defined by the phrase "comprising one ... " does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0045] The various embodiments in this specification are described in a related manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and relevant parts can be referred to the description of the method embodiment.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for ecological interception calculation and carrying capacity conversion of pump-sluice coupling in plain polder areas, characterized in that, Includes the following steps: S1. Based on the hydraulic characteristics of strong hydrodynamic disturbance and resuspension of bottom sediment during centralized drainage in plain polder areas, a multi-level control system is configured in reverse along the main drainage system, with the centralized drainage pumping station in the plain polder area as the radiation center. S2. Taking advantage of the physical enclosure of the plain polder area, flow velocity meters and high-frequency water quality and sediment online analyzers are deployed only at centralized drainage pumping stations or sluice gates that connect to the external receiving water bodies. The data interface of the sensing equipment is linked with the programmable logic controller of the drainage pumping station to establish the outlet as the controlled drainage monitoring section for material output of the plain polder area. S3. Obtain the start / stop status of the drainage pumping station PLC in real time via the server as a Boolean variable. The absolute interception and reduction flux during this drainage cycle was calculated. S4. Input the interception and reduction flux calculated in step S3 into the ecological carrying capacity transformation model of the closed water body: Substitute the nitrogen and phosphorus interception and reduction amount into the eutrophication threshold control equation of the water body, and convert it into the quota of new characteristic benthic aquatic product stocking density allowed in the water body within the dike under the premise of maintaining water quality standards; Substitute the sediment interception and reduction amount into the riverbed sedimentation evolution model, and convert it into the number of days of dredging-free navigation guarantee to meet the safe draft of cultural and tourism vessels within the dike; Use the stocking density quota and the number of dredging-free guarantee days as the quantitative production capacity data base for verifying the development value of agricultural and cultural tourism franchise rights in the plain dike area; S5. The server continuously tracks the unit flow material output load during the strong discharge pulse period. When the rate of change of the actual output load exceeds the empirical threshold of the critical flow velocity for bottom sediment initiation, and when it is deduced that the aquaculture quota or the number of days without dredging in step S4 is close to the preset safety red line for industrial damage, the system initiates reverse hydraulic tracing based on the topology of the water network within the dike, locks the failed interception node, and generates a directional dredging or plant replanting maintenance work order containing spatial coordinates.

2. The method for ecological interception calculation and carrying capacity conversion of pump-sluice coupling in plain polder areas according to claim 1, characterized in that: The control system described in step S1 includes a plant filter strip located at the junction of farmland drainage and flood discharge, an ecological pond at the drainage node, and a box-shaped ecological block revetment for the easily eroded section of the main stream.

3. The method for ecological interception calculation and carrying capacity conversion of pump-sluice coupling in plain polder areas according to claim 2, characterized in that: The box-type ecological block revetment adopts a prefabricated stepped porous box body, which is filled with a graded crushed stone filter layer to reduce the reverse hydraulic shear stress generated by pumping during the concentrated drainage period and to inhibit the secondary suspension of the deposited eutrophic bottom sediment. The ecological pond is reinforced with anti-corrosion imitation wood piles, and emergent plant communities are planted on the bank slope and in the pond to delay and settle suspended particulate matter in the aquaculture runoff and the initial rainwater from the farmland.

4. The method for ecological interception calculation and carrying capacity conversion of pump-sluice coupling in plain polder areas according to claim 1, characterized in that: The sensing devices in step S2 include an ultrasonic Doppler flow meter, a high-frequency online turbidity meter, and an online total nitrogen / total phosphorus analyzer; the server performs data spatiotemporal alignment and filtering noise reduction: synchronously interpolating the flow rate and water quality sampling frequency to the same time resolution. To address the burr noise signal generated by the sensor due to strong turbulence and bubbles under the drainage pump, the system's underlying layer applies adaptive Kalman filtering for smoothing and noise reduction, thereby obtaining high-precision instantaneous flow rate. With instantaneous concentration Time series.

5. The method for ecological interception calculation and carrying capacity conversion of pump-sluice coupling in plain polder areas according to claim 1, characterized in that: During the power-on forced discharge in step S3 When the machine is stopped and recirculated, ; exist During this period, the system determined that the polder area was in a state of stagnant water and suspended the output flux calculation; exist Within the time window, the actual discharge load is calculated by discrete integration based on the instantaneous flow and concentration of the controlled drainage monitoring section; the difference is then made between this actual discharge load and the theoretical pulse discharge load derived from the preset plain polder background runoff baseline model.

6. The method for ecological interception calculation and carrying capacity conversion of pump-sluice coupling in plain polder areas according to claim 5, characterized in that: The pulse-type flux discrete integral calculation based on the Boolean state of the pump uses logic switches to filter out static background data generated by the static internal circulation of water in the plain polder area during non-drainage periods, and only calculates flux for the hydrodynamic output stage subject to artificial mechanical intervention.

7. The method for ecological interception calculation and carrying capacity conversion of pump-sluice coupling in plain polder areas according to claim 1, characterized in that: The mapping method for the allowable increase in stocking density quota of characteristic benthic aquatic products in step S4 is as follows: taking the safe margin of the water environment capacity of the closed water body in the plain polder area as the constraint boundary, the chemical oxygen demand and ammonia nitrogen equivalent actually intercepted by the multi-level physical barrier network are divided by the life cycle pollution discharge coefficient of the specific aquatic species to calculate the number of seedlings to be released for expansion.

8. A system for ecological interception calculation and carrying capacity conversion of pump-sluice gates in plain polder areas, implementing the method of any one of claims 1-7, characterized in that, include: The internal physical barrier control module includes plant filter strips, ecological ponds and box-shaped ecological block revetments deployed in the plain polder water network, which are used to retain non-point source pollution from settled farmland during non-drainage periods and to buffer the disturbance of bottom sediment by mechanical suction during periods of heavy drainage. The controlled drainage monitoring module is deployed at the controlled drainage monitoring section of the drainage pumping station or culvert in the plain polder area. It is hardwired and linked with the control system of the drainage pumping station to synchronously wake up the high-frequency sampling work when the drainage command is issued. The pulse integral operation module includes a discrete integral algorithm coupled with the pump start-up and shut-down status, which is used to remove background redundant data during the still water period in the plain polder area and calculate the absolute interception and reduction flux of sediment and nitrogen and phosphorus within the time window of the forced discharge pulse. The carrying capacity mapping and management scheduling module is used to objectively convert the absolute interception and reduction flux into aquaculture quotas and cruise ship navigation dredging-free cycle indicators, generate the accounting base for franchise pricing, and generate targeted management instructions for specific internal nodes through topology reverse calculation when the carrying capacity indicator is detected to be approaching the safety threshold.

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