A water quantity and quality process simulation and regulation method for initial rainwater storage engineering

Abstract

The application discloses a kind of water quantity water quality process simulation and regulation and control method of initial rainwater regulation and storage engineering;With a certain scale of water storage and complete water quality purification function, can play the role of peak shaving, peak lag, pollution reduction, pollution control to the water quantity water quality change process of field precipitation process.The application constructs the hydraulic relationship structure model of initial rainwater regulation and storage engineering, constructs the water quality purification process of initial rainwater regulation and storage engineering and constructs the real-time scheduling mode of initial rainwater regulation and storage engineering, carries out the simulation deduction of water quantity water quality change process to initial rainwater regulation and storage engineering, so that engineering operation personnel can know the water quantity water quality change condition of initial rainwater regulation and storage engineering in the field precipitation process about to occur in advance, form regulation and control plan by simulation deduction, and then reduce and lag the peak value of inflow runoff and pollution load in actual operation process.The application patent has good effect in practical application.

Description

TECHNICAL FIELD

[0001] The application relates to a water quantity and water quality process simulation and regulation method for an initial rainwater storage project. BACKGROUND

[0002] Accurate water quantity and water quality deduction and regulation of the initial rainwater storage project, which provides reliable pre-rehearsal plans for actual operation and maintenance, is an important guarantee for long-term operation and maintenance of the initial rainwater storage project. There are three difficulties in water quantity and water quality deduction and regulation of the initial rainwater storage project: firstly, the hydraulic relationship is complex, the hydraulic relationship in the initial rainwater storage project is regulated by multiple types of hydraulic structures such as pipelines, water pumps and gates, the water quantity and pollutant transmission path is diversified, how to accurately depict the water quantity and pollutant transmission path of the initial rainwater storage project under different scenarios is the premise of water quantity and water quality deduction; secondly, the water quality purification process is complex, there are multiple complex water quality purification processes in the initial rainwater storage project, and there are many factors affecting the effluent water quality concentration, how to accurately reflect the dynamic reduction of pollutants by the initial rainwater storage project is a necessary condition for water quantity and water quality deduction; thirdly, real-time regulation is difficult, the initial rainwater storage project needs to dynamically adjust the opening and closing time of the water pump unit and the gate according to the rainfall condition and the storage capacity of the storage tank, how to reflect the water quantity and pollutant storage effect of the initial rainwater storage project on the rainfall process is an important means of water quantity and water quality regulation.

[0003] The prior art has solved the problem of water quantity and water quality simulation and control of the initial rainwater storage project in the city to a certain extent. However, in the face of the complex hydraulic relationship, water quality purification process and real-time regulation demand of the initial rainwater storage project in the city, the prior art still has many problems, which are specifically described as follows:

[0004] Firstly, the initial rainwater storage project in the city has a complex hydraulic relationship, and when overflow occurs in the storage tank, the water quantity and pollutants will have different flow paths. Specifically, when the storage tank does not overflow, the water quantity and pollutants entering the plant will first enter the storage tank, and then be discharged into the river by the water pump unit after water quality purification treatment; when the storage tank overflows, in order to ensure the overall safety of the project, the water quantity and pollutants entering the plant will be directly discharged into the river through the orifice gate to reduce the pressure on the initial rainwater storage tank. The prior art adopts a series type hydraulic connection, and the flow path of the water quantity and pollutants is single whether the storage tank overflows or not, which cannot reflect the actual hydraulic relationship of the initial rainwater storage tank.

[0005] Secondly, the urban initial rainwater storage project has a complex water quality purification process, and the purification process is nonlinear and dynamic. Specifically, the initial rainwater storage tank project has many processes such as coarse grid, physical sedimentation, oxidation-reduction reaction, and the water quality purification result is not only related to the concentration of the inlet, but also closely related to the water power influencing factors of the treatment process, such as hydraulic retention time, water depth, flow rate, etc. In the existing technology, the initial rainwater storage project is generally generalized as a uniform mixer in the process of deducing the water quantity and water quality process of the initial rainwater storage project, and the pollution load removal rate in the engineering design is used to represent the water quality purification function of the initial rainwater storage project. This generalization method not only ignores the multi-process water quality purification process in the initial rainwater storage tank, but also lacks the dynamic regulation and control of the initial rainwater storage tank to the pollution load.

[0006] Thirdly, the urban initial rainwater storage project has the practical demand of real-time regulation and control, and the practical demand needs to be regulated and controlled in real time according to the water depth of the storage tank, so the real-time and operability of the regulation and control method is extremely high. In the existing technology, the opening and closing water depth of the water pump unit is used to adjust the drainage and pollution process of the initial rainwater storage project in the process of regulating and controlling the water quantity and water quality process of the initial rainwater storage project, but this regulation and control process is quite different from the actual situation. In the actual operation process of the initial rainwater storage project, if there is no overflow in the process of precipitation, the rainwater is generally stored in the storage tank, and after the rain, the initial rainwater is gradually purified and discharged into the river; if overflow occurs during the precipitation process, the overflow water needs to be quickly discharged into the river to reduce the damage to the project itself. SUMMARY

[0007] The purpose of the present application is to provide a water quantity and water quality process simulation and regulation method for the initial rainwater storage project, which is a water quantity and water quality process simulation and regulation method for the initial rainwater storage project in the urban area.

[0008] To achieve the above purpose, the technical scheme of the present application is:

[0009] The water power relationship structure model of the initial rainwater storage project is constructed, the water quality purification process of the initial rainwater storage project is constructed, and the real-time scheduling mode of the initial rainwater storage project is constructed, wherein:

[0010] The water power relationship structure model of the initial rainwater storage project is constructed, the water quality purification process of the initial rainwater storage project is constructed, and the real-time scheduling mode of the initial rainwater storage project is constructed, wherein:

[0011] The water quality purification process of the constructed initial rainwater storage project is: on the basis of the device hydraulic relationship structure, a multiple function relationship formula of the effluent water quality concentration and the influent water quality concentration, the hydraulic retention time and the water depth elements is established, and on the basis of the water balance control equation, an effluent water quality concentration calculation formula is proposed to represent the water quality purification process inside the initial rainwater storage project.

[0012] The real-time scheduling mode of the constructed initial rainwater storage project is: on the basis of the device hydraulic relationship structure and the water quality purification process, the transfer process of the inflow and outflow water quality of the initial rainwater storage project is dynamically and real-timely regulated, so as to reduce and lag the peak value of the rainwater inflow into the river and the peak value of the initial rainwater pollution load.

[0013] Further, the device hydraulic relationship structure comprises: a rainwater inlet pipeline, a rainwater storage tank, a tank outlet pipeline, a water pump unit, an orifice gate, a water quality purification node, an outlet node, and an outlet pipeline; wherein: the rainwater inlet pipeline is connected to the rainwater storage tank, the tank outlet pipeline of the rainwater storage tank is connected to the water pump unit, the water pump unit is provided with a plurality of water pumps arranged side by side, the outputs of the plurality of water pumps are collected to the water quality purification node, the water quality purification node is connected to the outlet node, the rainwater storage tank is provided with an overflow port, the overflow port is connected to the outlet node through the orifice gate, finally, the outlet node is uniformly connected to the outlet pipeline, and the orifice gate is a bidirectional pump gate.

[0014] Further, in the process of the rainfall in the field:

[0015] When the rainwater storage tank does not overflow, the inflow water quantity and pollutants flow into the rainwater storage tank through the rainwater inlet pipeline, the water pump unit pumps out the rainwater in the rainwater storage tank from the tank outlet pipeline to the water quality purification node to reduce the pollutants, and finally, the water is discharged into the river through the outlet node and the outlet pipeline;

[0016] When the rainwater storage tank overflows, the water quantity and pollutants overflowing from the overflow port directly enter the outlet node through the orifice gate, and then enter the river through the outlet pipeline.

[0017] Further, the rainwater inlet pipeline and the outlet pipeline adopt a circular concrete pipeline, the rainwater storage tank has a cuboid shape, and the volume is determined by the actual engineering design storage capacity; the water pump unit has a pumping capacity according to the design of the initial rainwater storage tank, and the water quality treatment capacity of the water quality purification node is consistent with the water quality treatment process and the pollution load removal ratio of the initial rainwater storage tank.

[0018] Further, the water balance control equation of the device is:

[0019]

[0020] In the formula:

[0021] W t+Δt , W t represent the flow of rainwater into the plant pipeline and the rainwater storage tank at t+Δt, t, m 3 / s, or the water head of the water pump unit, m;

[0022] S1, S2, respectively represent the cross-sectional area of the rainwater into the plant pipeline;

[0023] WL1, WL2 respectively represent the water level at the front end and the rear end of the rainwater storage tank and the water pump unit;

[0024] V is the average flow rate of the rainwater into the plant pipeline at t, m 3 / s, the average hydraulic radius, m, and the average cross-sectional area, m 2 ;

[0025] L is the length of the rainwater into the plant pipeline, m;

[0026] M=g(n / 1.49) 2 ; n is the Manning roughness coefficient;

[0027] g is the acceleration of gravity, which is 9.80, m / s 2 ;

[0028] The water quality concentration calculation formula is:

[0029] C out =a+(C in -a)*EXP[(-b / 3600)*(DT / WD)]

[0030] Wherein:

[0031] C out , C in respectively represent the water quality concentration of the initial rainwater storage project into the plant and out of the plant;

[0032] a is a constant coefficient, which is determined according to the type of pollutants;

[0033] b is a constant coefficient;

[0034] DT represents the hydraulic retention time inside the rainwater storage tank, h;

[0035] WD represents the water depth inside the rainwater storage tank, m.

[0036] Further, b is 0.99, a is 1 when the type of pollutants is chemical oxygen demand, and a is 0.01 when the type of pollutants is total phosphorus or ammonia nitrogen.

[0037] Further, the dynamic real-time regulation comprises: when the real-time storage capacity of the rainwater storage tank is less than the highest warning water level, the state of the water pump unit is closed, otherwise the state of the water pump unit is opened; and when the real-time storage capacity of the rainwater storage tank is greater than the highest warning water level, the orifice gate is opened to drain until the storage capacity of the rainwater storage tank is reduced below the highest warning water level.

[0038] Further, the dynamic real-time regulation provides the following rule statements for the real-time scheduling of the initial rainwater storage project:

[0039] RULE PUMP%%defines the name of the water pump scheduling rule, RULE is the index of the scheduling rule name, and PUMP is the scheduled water pump object

[0040] IF NODE Storage Volume<Wmax%%judges the water quantity in the rainwater storage tank, IF is the judgment index, NODE is the rainwater storage tank index, Storage Volume is the water quantity value index of the rainwater storage tank, < is the judgment symbol, and Wmax is the warning water quantity threshold of the rainwater storage tank

[0041] AND LINK FLOW>0%%AND is parallel to the IF judgment index, which is a supplement to the IF judgment index, LINK is the inlet pipeline index, FLOW is the inlet pipeline flow index, and > is the judgment symbol

[0042] THEN PUMP STATUS=OFF%%THEN is the execution index after the judgment, STATUS is the state of the scheduled water pump object, = is the judgment symbol, and OFF represents the closed state

[0043] ELSE PUMP STATUS=ON%%ELSE is the execution index after the judgment, which is in repulsion relationship with THEN, and ON represents the open state

[0044] RULE Orifice%%defines the name of the orifice gate scheduling rule, RULE is the index of the scheduling rule name, and Orifice is the scheduled orifice gate object

[0045] IF NODE Storage Volume>=Wmax%%same as above

[0046] THEN ORIFICE SETTING=1%%ORIFICE is the scheduled object, SETTING is the state of the scheduled orifice gate object, = is the judgment symbol, and 1 represents that the orifice gate is fully opened

[0047] ELSE ORIFICE SETTING = 0% 0 represents the orifice gate is fully closed

[0048] The above rule statement is divided into two parts, one part controls the opening and closing of the water pump unit, and the other part controls the opening and closing of the orifice gate. The rule statement for controlling the opening and closing of the water pump unit starts with "RULE PUMP". In the initial rainwater storage engineering water quantity and quality deduction process, the storage volume is represented as a node, and the real-time storage capacity of the storage volume is represented as "NODE Storage Volume". When the real-time storage capacity of the storage volume is less than the set storage capacity Wmax1, and the inflow is greater than 0, the state of the water pump unit "PUMP STATUS" is closed, otherwise the state of the water pump unit is opened. The digital twin is used to reduce the peak of the initial rainwater storage engineering to water quantity and pollutants during the game precipitation. On the other hand, in the control of the opening and closing of the orifice gate, "RULE Orifice" is started, and in the initial rainwater storage engineering water quantity and quality deduction process, the real-time storage capacity of the storage volume "NODE Storage Volume" is greater than the maximum storage capacity Wmax. In order to prevent overflow of the rainwater storage tank, the orifice gate is opened urgently to discharge until the storage capacity of the storage tank is reduced to below the maximum storage capacity Wmax.

[0049] Further, when the state of the water pump unit is opened, the number of water pumps started is determined according to the flow of the rainwater inflow pipeline, or the real-time storage capacity change speed of the rainwater storage tank, or the purification capacity of the water quality purification node to different water quality.

[0050] The beneficial effects of the present application are: compared with the prior art, the method of the present application has better application effect in the aspects of hydraulic relationship construction, water quality purification treatment and real-time regulation.

[0051] 1. In the aspect of hydraulic relationship construction, the prior art generally generalizes the initial rainwater storage engineering as a storage tank in the initial rainwater storage engineering water quantity and quality process deduction process, only considers the water storage condition of the initial rainwater storage engineering in the actual situation, ignores the water quality purification and regulation of water quantity and pollutants of the initial rainwater storage engineering, and leads to the problem that the initial rainwater storage engineering water quantity and quality change process cannot be accurately determined in the prior art. In view of this problem, the present application ingeniously uses pipeline, reservoir, water pump, orifice gate and other hydraulic structures to realize the digital twin mapping of the initial rainwater storage engineering. Through the pipeline network, storage tank, water pump and other structures, the water quantity transmission and pollutant reduction process of the storage tank under the condition of no overflow is deduced. Through the pipeline network, storage tank, orifice and other structures, the process of emergency discharge of water quantity of the storage tank under the condition of overflow is deduced. This hydraulic relationship construction method deduces the initial rainwater storage engineering water quantity and pollutant transmission process, which is highly consistent with the actual situation.

[0052] 2. In the aspect of water quality purification treatment, the prior art generally generalizes the initial rainwater storage project as a uniform mixer in the process of developing the water quantity and water quality process deduction of the initial rainwater storage project, and a single pollution load removal rate in engineering design is used to represent the water quality purification function of the initial rainwater storage project. This generalization method not only ignores the internal multi-channel water quality purification process of the initial rainwater storage tank, but also lacks the dynamic regulation and control effect of the initial rainwater storage tank on the pollution load. In view of this problem, the present application establishes a functional relationship between the effluent water quality concentration and the influent water quality, the water depth of the storage tank and the hydraulic retention time of the storage tank based on a large amount of measured data of the water quantity and water quality of the initial rainwater storage tank, and accurately depicts the dynamic regulation and control process of the initial rainwater storage project on the effluent water quality.

[0053] 3. In the aspect of real-time scheduling, the prior art generally uses the set-on and set-off water depth of the water pump unit to adjust the drainage and pollution process of the initial rainwater storage project in the process of developing the water quantity and water quality process regulation of the initial rainwater storage project. However, this regulation and control process is quite different from the actual situation. In the actual operation process of the initial rainwater storage project, if there is no overflow in the process of the rainfall, the rainwater is generally stored in the storage tank, and the initial rainwater is gradually purified and discharged into the river after the rain; if overflow occurs in the process of the rainfall, the overflow water quantity generally needs to be quickly discharged into the river to reduce the damage to the project itself. Therefore, the present application introduces a real-time control strategy in the water quantity and water quality deduction process of the initial rainwater storage project in view of the deficiencies of the prior art and in combination with the actual operation rules, and realizes the reverse hydrological process of "intercepting and intercepting pollution in the rain, and supplying clean water after the rain", which is highly consistent with the actual operation scheduling rules.

[0054] The present application will be further explained in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0055] Figure 1 Real-time regulation and control flow chart of the initial rainwater storage project;

[0056] Figure 2 Hydraulic relationship structure diagram of the water quantity and water quality process deduction of the initial rainwater storage project;

[0057] Figure 3 is the water quantity deduction and regulation and control result diagram of the initial rainwater storage project with 2-hour rainfall of 0.5-year frequency as an example;

[0058] Figure 4 is the water quality deduction and regulation and control result diagram of the initial rainwater storage project with 2-hour rainfall of 0.5-year frequency as an example.

[0059] In the drawings: 1 is a rainwater inlet pipeline, 2 is a rainwater storage tank, 3 is a tank outlet pipeline, 4 is a water pump unit, 5 is an orifice gate, 6 is a water quality purification node, 7 is an effluent node, and 8 is an effluent pipeline.Figure 3 and Figure 4 The blue line is the water quantity and quality change process deduced by the prior art method, and the yellow line is the water quantity and quality change process deduced by the present application. DETAILED DESCRIPTION

[0060] Embodiment 1:

[0061] A water quantity and quality process simulation and regulation method for an initial rainwater storage project, which is used for an urban initial rainwater storage project, such as the one shown in the accompanying drawings. Figure 1 The accompanying drawings Figure 2 As shown in the accompanying drawings, the method comprises: constructing a hydraulic relationship structure model of the initial rainwater storage project, constructing a water quality purification process of the initial rainwater storage project, and constructing a real-time scheduling mode of the initial rainwater storage project, wherein:

[0062] The construction of the hydraulic relationship structure model of the initial rainwater storage project is to construct a device hydraulic relationship structure of the initial rainwater storage project, which adopts a combination mode of an orifice gate and a water pump linkage, and comprises a control node of a water quantity and a pollutant transmission process.

[0063] The construction of the water quality purification process of the initial rainwater storage project is to establish a multiple function relationship formula of an effluent water quality concentration and an influent water quality concentration, a hydraulic retention time, and a water depth element on the basis of the device hydraulic relationship structure, to propose an effluent water quality concentration calculation formula on the basis of a water quantity balance formula, to use the effluent water quality concentration calculation formula to represent the water quality purification process inside the initial rainwater storage project, and to express the multiple function relationship of the effluent water quality concentration and the influent water quality concentration, the hydraulic retention time, and the water depth element.

[0064] The construction of the real-time scheduling mode of the initial rainwater storage project is to dynamically and real-timely regulate and control the transmission process of the water quantity and quality of the initial rainwater storage project on the basis of the device hydraulic relationship structure and the water quality purification process, to reduce and lag the peak value of the rainwater inflow into a river and the peak value of the initial rainwater pollution load.

[0065] Embodiment 2:

[0066] This embodiment is a refinement of Embodiment 1. This embodiment skillfully uses pipe gate pumps and other hydraulic structures to accurately depict the water quantity and pollutant transmission process of the initial rainwater storage project in different scenarios such as no overflow and overflow, to clarify the setting principles and methods of key nodes in the digital twin of the initial rainwater storage project, and to clarify the key control equations in the water quantity and quality deduction process. This innovation overcomes the problem of unclear water quantity and pollutant discharge path caused by the unclear depiction of the complex hydraulic relationship of the initial rainwater storage project in the prior art.

[0067] As shown in the accompanying drawings Figure 2As shown, the device hydraulic relationship structure includes: rainwater inlet pipeline 1, rainwater storage tank 2, tank outlet pipeline 3, water pump unit 4, orifice gate 5, water quality purification node 6, outlet node 7, outlet pipeline 8; wherein: the rainwater inlet pipeline 1 is connected to the rainwater storage tank 2, the tank outlet pipeline 3 of the rainwater storage tank 2 is connected to the water pump unit 4, the water pump unit 4 is provided with multiple water pumps arranged side by side according to the actual number of water pumps, the outputs of the multiple water pumps are collected to the water quality purification node 6, the water quality purification node 6 is further connected to the outlet node 7, the rainwater storage tank 2 is provided with an overflow port, the overflow port is connected to the outlet node 7 through the orifice gate 5, finally the outlet node 7 is uniformly connected to the outlet pipeline 8, and the orifice gate 5 is a bidirectional pump gate.

[0068] Embodiment 3:

[0069] This embodiment is a refinement of embodiment 2, as Figure 2 In combination Figure 1 As shown, during the process of the field precipitation, when the rainwater storage tank 2 does not overflow, the water quantity and pollutants are flowed into the rainwater storage tank 2 through the rainwater inlet pipeline 1, the water pump unit 4 pumps the rainwater in the rainwater storage tank 2 out through the tank outlet pipeline 3 and transports it to the water quality purification node 6 to reduce the pollutants, finally, the purified water with reduced pollutants is discharged into the river through the outlet node 7 and the outlet pipeline 8, and at the same time, a part of the purified water is divided from the outlet node 7, returns to the rainwater storage tank 2 through the orifice gate 5 and the overflow port, and dilutes the rainwater in the rainwater storage tank 2. The summary description is that when the rainwater storage tank 2 does not overflow, the water quantity and water quality transmission path is rainwater inlet pipeline 1→rainwater storage tank 2→tank outlet pipeline 3→water pump unit 4→water quality purification node 6→outlet node 7→outlet pipeline 8.

[0070] During the process of the field precipitation, when the rainwater storage tank 2 overflows, the water quantity and pollutants overflowing from the overflow port directly enter the outlet node 7 through the orifice gate 5, and then are discharged into the river through the outlet pipeline 8. The summary description is that when the rainwater storage tank 2 overflows, the water quantity and water quality transmission path is rainwater inlet pipeline 1→rainwater storage tank 2→orifice gate 5→outlet node 7→outlet pipeline 8.

[0071] Embodiment 4:

[0072] This embodiment is a refinement of embodiment 2, the rainwater inlet pipeline 1 and the outlet pipeline 8 adopt circular concrete pipelines, the shape of the rainwater storage tank 2 is a cuboid, the volume is determined by the actual engineering design storage capacity, that is, determined by the multiple function relationship in the water balance control equation and the water quality concentration calculation formula; the water pump set 4 is designed according to the pumping capacity of the initial rainwater storage tank, and the water quality treatment capacity of the water quality purification node 6 is consistent with the water quality treatment process and pollution load removal ratio of the initial rainwater storage tank.

[0073] Embodiment 5:

[0074] This embodiment is a refinement of embodiment 1, wherein:

[0075] The water balance control equation of the device is:

[0076]

[0077] In the formula:

[0078] W t+Δt , W t represents the flow of the rainwater inlet pipeline 1 and the rainwater storage tank 2 at t+Δt and t, m 3 / s, or the water head of the water pump set 4, m;

[0079] S1, S2, respectively represent the cross-sectional area of the rainwater inlet pipeline 1;

[0080] WL1, WL2 respectively represent the water level at the front end and the rear end of the rainwater storage tank 2 and the water pump set 4;

[0081] is the average flow velocity of the rainwater inlet pipeline 1 at t, m 3 / s, the average hydraulic radius, m, and the average cross-sectional area, m 2 ;

[0082] L is the length of the rainwater inlet pipeline 1, m;

[0083] M=g(n / 1.49) 2 ; n is the Manning roughness coefficient;

[0084] g is the acceleration of gravity, which is 9.80, m / s 2 ;

[0085] The water quality concentration calculation formula is:

[0086] C out =a+(C in -a)*EXP[(-b / 3600)*(DT / WD)]

[0087] Wherein:

[0088] C out 、C in respectively represent the concentration of influent and effluent of the initial rainwater storage project;

[0089] a is a constant coefficient, which is determined according to the type of pollutants, when the type of pollutants is chemical oxygen demand, a is 1; when the type of pollutants is total phosphorus or ammonia nitrogen, a is 0.01;

[0090] b is a constant coefficient, and the value of b is 0.99;

[0091] DT represents the hydraulic retention time in the rainwater storage tank, h;

[0092] WD represents the water depth in the rainwater storage tank, m.

[0093] The water balance control equation and the water quality concentration calculation formula of the device constitute a digital model for simulating the water quantity and water quality process in the initial rainwater storage, and the dynamic regulation and control process of various water quality purification processes on the effluent water quality concentration is represented by changing the variable of the multivariate function in the water balance control equation and the water quality concentration calculation formula, which overcomes the problem of static evaluation of the water quality of the initial rainwater storage project in the prior art.

[0094] The above embodiment has:

[0095] In terms of the method for constructing the hydraulic relationship structure of the initial rainwater storage project, based on the existing hydrological, hydrodynamic and water quality mechanism model, the digital twin mapping of the initial rainwater storage project is realized by skillfully using pipeline, water storage tank, water pump, orifice gate and other hydraulic structures, so that the water quantity and pollutant transport process is consistent with the actual situation, and the problem of incorrect water quantity and pollutant transport path caused by the simplification of the hydraulic relationship in the water quantity and water quality simulation process of the initial rainwater storage tank is overcome.

[0096] In terms of the method for constructing the water quality purification process of the initial rainwater storage project, based on a large amount of water quantity and water quality measurement data, a functional relationship between the effluent water quality and the influent water quality, the water depth of the storage tank and the hydraulic retention time of the storage tank is established, so that the effluent water quality is consistent with the degree of pollution load reduction of the actual initial rainwater storage tank, and the problem of large deviation of the effluent water quality from the actual situation caused by the use of a simple pollution load removal rate in the water quality purification of the initial rainwater storage tank is overcome.

[0097] In the aspect of constructing the real-time scheduling mode of the initial rainwater storage project, a real-time control strategy is adopted, a rule controller is added in the water quantity and quality simulation process of the initial rainwater storage project, the real-time control of the water pump unit and the orifice gate in the initial rainwater storage project is completed, the reverse hydrological process of "cutting off sewage in rain and supplying clean water after rain" of the initial rainwater storage project is realized, and the problem that the water quantity and quality of the outlet of the initial rainwater storage project deviates too much from the actual situation due to the adoption of the one-way static control rule of setting the pump starting water level is overcome.

[0098] Embodiment 6:

[0099] This embodiment is a refinement of Embodiment 1, and the dynamic real-time regulation includes: when the real-time storage capacity of the rainwater storage tank 2 is less than the highest warning water level, the state of the water pump unit 4 is the closed state, otherwise the state of the water pump unit is the open state; and when the real-time storage capacity of the rainwater storage tank 2 is greater than the highest warning water level, the orifice gate 5 is opened to discharge, until the storage capacity of the rainwater storage tank 2 falls below the highest warning water level.

[0100] Embodiment 7:

[0101] Based on the real-time control strategy, a real-time control regulator is added in the model water power and water quality calculation process, the opening and closing mode of the water pump unit 4 and the orifice gate 5 is scheduled through the control rule, so as to realize the real-time scheduling purpose of the initial rainwater storage tank project; the regulation and control process of the initial rainwater storage project is completed through the real-time control regulator, the control rule statement in the real-time control regulator is written in the mode of "named variable" plus "variable relationship value" plus "variable relationship variable", and is called in the form of if-then-else, for the water quantity and quality process deduction method of the initial rainwater storage project provided in this embodiment, the following rule statements are provided in this embodiment for the dynamic real-time scheduling of the initial rainwater storage project:

[0102] RULE PUMP%%Definition of water pump scheduling rule name, RULE is the scheduling rule name index, PUMP is the water pump object to be scheduled

[0103] IF NODE Storage Volume < Wmax%%Judge the water quantity in the rainwater storage tank, IF is the judgment index, NODE is the rainwater storage tank index, Storage Volume is the rainwater storage tank water quantity value index, < is the judgment symbol, Wmax is the rainwater storage tank warning water quantity threshold

[0104] AND LINK FLOW > 0%%AND is parallel to the IF judgment index, which is a supplement to the IF judgment index, LINK is the inlet pipe index, FLOW is the inlet pipe flow index, > is the judgment symbol

[0105] THEN PUMP STATUS=OFF % % THEN is the execution index after the end of the judgment, STATUS is the state of the scheduled water pump object, = is the judgment symbol, and OFF represents the closed state

[0106] ELSE PUMP STATUS=ON % % ELSE is the execution index after the end of the judgment, which is in repulsion relationship with THEN, and ON represents the open state

[0107] RULE Orifice % % Define the orifice gate scheduling rule name, RULE is the scheduling rule name index, and Orifice is the scheduled orifice gate object

[0108] IF NODE Storage Volume >= Wmax % % Same as above

[0109] THEN ORIFICE SETTING=1 % % ORIFICE is the scheduled object, SETTING is the state of the scheduled orifice gate object, = is the judgment symbol, and 1 represents that the orifice gate is fully open

[0110] ELSE ORIFICE SETTING=0 % % 0 represents that the orifice gate is fully closed

[0111] The above rule statements are divided into two parts, one part controls the start and stop of the water pump set 4, and the other part controls the start and stop of the orifice gate 5. Among them, the rule statement for controlling the start and stop of the water pump set 4 starts with “RULE PUMP”. In the initial rainwater storage project water quantity and quality deduction process, the storage tank is taken as a node, and “NODE Storage Volume” represents the real-time storage capacity of the storage tank. When the real-time storage capacity of the storage tank is less than the set storage capacity Wmax1, and “LINK FLOW>0” represents that the inflow is greater than 0, the state of the water pump set “PUMP STATUS” is closed. Otherwise, the state of the water pump set 4 is open, which is used for digital twin to cut the peak of water quantity and pollutants of the initial rainwater storage project during the on-site rainfall. On the other hand, in the control of the start and stop of the orifice gate 5, “RULE Orifice” is started. In the initial rainwater storage project water quantity and quality deduction process, when the real-time storage capacity of the storage tank “NODE Storage Volume” is greater than the maximum storage capacity Wmax, the orifice gate 5 is urgently opened to discharge in order to prevent overflow of the rainwater storage tank, until the storage capacity of the storage tank decreases to below the maximum storage capacity Wmax.

[0112] Example 8:

[0113] The embodiment is further refined on the basis of embodiment 7 or 8, and when the state of the water pump unit is an open state, the number of started water pumps is determined according to the flow of the rainwater inlet pipeline 1, or the real-time storage capacity change speed of the rainwater storage tank 2, or the purification capacity of the water quality purification node 6 for different water qualities.

[0114] The comparison between the above-mentioned embodiment technical solution and the prior art shows the advantages of the embodiment, as shown in the accompanying Figure 3 , accompanying Figure 4 Compared with the prior art, the initial rainwater storage engineering water quantity and water quality process simulation deduction and regulation method provided by the embodiment has better application effects in the aspects of hydraulic relationship construction, water quality purification treatment, and real-time regulation.

[0115] First, in terms of hydraulic relationship construction, the prior art generally generalizes the initial rainwater storage engineering as a storage tank in the process of carrying out the initial rainwater storage engineering water quantity and water quality process deduction, only considers the water storage condition of the initial rainwater storage engineering in the actual situation, ignores the water quality purification and regulation of water quantity and pollutants of the initial rainwater storage engineering, and leads to the problem that the initial rainwater storage engineering water quantity and water quality change process cannot be accurately determined in the prior art. To solve this problem, the application ingeniously uses pipeline, storage tank, water pump, orifice gate and other hydraulic structures to realize the digital twin mapping of the initial rainwater storage engineering. Through the pipeline network, storage tank, water pump and other structures, the water quantity transmission and pollutant reduction process of the storage tank under the condition of no overflow is deduced. Through the pipeline network, storage tank, orifice gate and other structures, the process of emergency water quantity discharge of the storage tank under the condition of overflow is deduced. The initial rainwater storage engineering water quantity and pollutant transmission process deduced by this hydraulic relationship construction method is highly consistent with the actual situation.

[0116] Second, in terms of water quality purification treatment, the prior art generally generalizes the initial rainwater storage engineering as a uniform mixer in the process of carrying out the initial rainwater storage engineering water quantity and water quality process deduction, and only uses the pollution load removal rate in engineering design to represent the water quality purification function of the initial rainwater storage engineering. This generalization method not only ignores the multiple water quality purification processes inside the initial rainwater storage tank, but also lacks the dynamic regulation of the initial rainwater storage tank to the pollution load. To solve this problem, the application establishes a functional relationship between the outlet water quality concentration, inlet water quality, water depth of the storage tank, and hydraulic retention time of the storage tank based on a large amount of initial rainwater storage tank inlet and outlet water quantity and water quality measurement data, accurately describes the dynamic regulation process of the initial rainwater storage engineering to the outlet water quality.

[0117] Three is in the real-time scheduling mode, the prior art generally in the early stage of rainwater storage engineering water quality process control process, using the set water pump unit to adjust the initial rainwater storage engineering drainage process of opening and closing water depth, but this control process is quite different from the actual situation. Initial rainwater storage engineering in the actual operation process, such as in the process of rainfall without overflow, generally store rainwater in the reservoir, after the rain, gradually purify the initial rainwater and discharge into the river; If overflow occurs during the rainfall process, it is generally necessary to quickly discharge the overflow into the river to reduce the damage to the project itself. Therefore, the present patent is aimed at the deficiencies of the prior art, and the actual operation rules are collected, and the real-time control strategy is introduced in the water quantity and water quality deduction process of the initial rainwater storage engineering, the controller is added in the water quantity and water quality iteration calculation, the control rule statement is written, the reverse hydrological process of "rain interception and pollution interception, rainwater supply" is realized, and the actual operation scheduling rules are highly consistent.

[0118] The water quantity deduction and regulation of the initial rainwater storage engineering is carried out with 2 hours of 0.5 year rainfall as an example Figure 3 , the water quality deduction and regulation is carried out as shown in Figure 4 , the blue line in the figure is the water quantity and water quality change process deduced by the prior art method, and the yellow line is the water quantity and water quality change process deduced by the present patent. It can be seen that compared with the prior art, the water quantity peak of the present patent is 4 hours later than the prior art, the water quality concentration peak is 4.3 hours later than the prior art, and the water quality concentration peak is 32.4% lower than the prior art, which further illustrates that the initial rainwater storage engineering water quantity and water quality deduction and regulation method provided by the present patent fully plays the function of rainwater storage tank capacity in water storage and water quality dilution, and is highly consistent with the scheduling rules of the actual project.

Claims

1. A method for simulating and controlling the water quantity and quality process of an initial rainwater storage project, used in urban initial rainwater storage projects, characterized in that, The method includes: constructing a hydraulic relationship structure model of the initial rainwater storage project, constructing a water purification process of the initial rainwater storage project, and constructing a real-time scheduling method for the initial rainwater storage project, wherein: The hydraulic relationship structure model for constructing the initial rainwater storage project is the equipment hydraulic relationship structure for constructing the initial rainwater storage project. The equipment hydraulic relationship structure adopts a combination of orifice gate and water pump linkage, including control nodes for water volume and pollutant transmission processes. The water purification process of the initial rainwater storage project is as follows: based on the hydraulic relationship structure of the equipment, a multivariate functional relationship is established between the effluent water quality concentration and the influent water quality concentration, hydraulic residence time, and water depth. Based on the water balance control equation, an effluent water quality concentration calculation formula is proposed. The effluent water quality concentration calculation formula is used to characterize the water purification process inside the initial rainwater storage project. The real-time scheduling method for constructing the initial rainwater storage project is based on the hydraulic relationship structure of the equipment and the water purification process. It dynamically and in real-time controls the transfer process of the inflow and outflow of water and water quality of the initial rainwater storage project, thereby reducing and delaying the peak flow of rainwater into the river and the peak pollution load of the initial rainwater. The water balance control equation for the equipment is: In the formula: W t The flow rate (m) represents the flow rate of rainwater entering the plant pipe (1) and the rainwater storage tank (2) at time t+Δt and t. 3 / s, or the head of the water pump unit (4), m; S1 and S2 represent the cross-sectional areas of the rainwater inlet pipe (1), respectively. WL1 and WL2 represent the water levels at the front and rear ends of the rainwater storage tank (2) and the pump unit (4), respectively. Let be the average flow velocity (m) of rainwater entering the plant pipe (1) at time t. 3 / s, average hydraulic radius (m), average cross-sectional area (m²) 2 ; L is the length of the rainwater inlet pipe (1), in meters; M = g(n / 1.49) 2 n is the Manning roughness coefficient; g is the acceleration due to gravity, with a value of 9.80 m / s². 2 ; The formula for calculating the water concentration is: C out =a+(C in -a)*EXP[(-b / 3600)*(DT / WD)] in: C out C in These represent the influent and effluent water quality concentrations of the initial rainwater storage project, respectively. 'a' is a constant coefficient, determined according to the type of pollutant. b is a constant coefficient; DT represents the hydraulic retention time inside the rainwater storage tank, in hours (h). WD represents the water depth inside the rainwater storage tank, in meters (m).

2. The method for simulating and controlling the water quantity and quality process of an initial rainwater storage project according to claim 1, characterized in that, The hydraulic structure of the equipment includes: rainwater inlet pipe (1), rainwater storage tank (2), outlet pipe (3), pump unit (4), orifice gate (5), water purification node (6), outlet node (7), and outlet pipe (8); wherein: the rainwater inlet pipe (1) is connected to the rainwater storage tank (2), the outlet pipe (3) of the rainwater storage tank (2) is connected to the pump unit (4), the pump unit (4) is equipped with multiple pumps in parallel, the output of the multiple pumps is collected at the water purification node (6), the water purification node (6) is then connected to the outlet node (7), the rainwater storage tank (2) is equipped with an overflow outlet, the overflow outlet is connected to the outlet node (7) through the orifice gate (5), and finally the outlet node (7) is uniformly connected to the outlet pipe (8), and the orifice gate (5) is a bidirectional pump gate.

3. The method for simulating and controlling the water quantity and quality process of an initial rainwater storage project according to claim 2, characterized in that, During the precipitation event: When the rainwater storage tank (2) does not overflow, the incoming water and pollutants flow into the rainwater storage tank (2) through the rainwater inlet pipe (1). The water pump unit (4) pumps the rainwater in the rainwater storage tank (2) from the outlet pipe (3) and transports it to the water purification node (6) to reduce the pollutants. Finally, it is discharged into the river through the outlet node (7) and the outlet pipe (8). When the rainwater storage tank (2) overflows, the water volume and pollutants overflowing from the overflow outlet directly enter the out-factory node (7) through the orifice gate (5), and then enter the river through the out-factory pipeline (8).

4. The method for simulating and controlling the water quantity and quality process of an initial rainwater storage project according to claim 2, characterized in that, The rainwater inlet pipeline (1) and the out-factory pipeline (8) adopt circular concrete pipelines. The shape of the rainwater storage tank (2) is a cuboid, and its volume is determined by the actual engineering design storage capacity. The water pump unit (4) is designed according to the pumping capacity of the water pump for the initial rainwater storage tank, and the water quality treatment capacity of the water quality purification node (6) is consistent with the water quality treatment process and pollution load removal ratio of the initial rainwater storage tank.

5. The method for simulating and controlling the water quantity and quality process of an initial rainwater storage project according to claim 1, characterized in that, In the water volume balance control equation of the equipment b takes the value of 0.

99. When the pollutant category is chemical oxygen demand, a is 1; when the pollutant category is total phosphorus or ammonia nitrogen, a is 0.

01.

6. The method for simulating and controlling the water quantity and quality process of an initial rainwater storage project according to claim 1, characterized in that, The dynamic real-time regulation includes: when the real-time storage volume of the rainwater storage tank (2) is less than the highest warning water level, the state of the water pump unit (4) is the closed state, otherwise the state of the water pump unit is the open state; and when the real-time storage volume of the rainwater storage tank (2) is greater than the highest warning water level, the orifice gate (5) is opened for drainage until the storage volume of the rainwater storage tank (2) drops below the highest warning water level.

7. The method for simulating and controlling the water quantity and quality process of an initial rainwater storage project according to claim 1, characterized in that, The dynamic real-time regulation provides the following rule statements for the real-time scheduling of the initial rainwater storage project RULE PUMP%%Defines the name of the water pump scheduling rule. RULE is the index of the scheduling rule name, and PUMP is the water pump object to be scheduled IF NODE Storage Volume<Wmax%%Judges the water volume in the rainwater storage tank. IF is the judgment index, NODE is the rainwater storage tank index, Storage Volume is the rainwater storage tank water volume value index, <is the judgment symbol, and Wmax is the warning water volume threshold of the rainwater storage tank AND LINK FLOW>0%%AND is juxtaposed with the IF judgment index and is a supplement to the IF judgment index. LINK is the inlet pipeline index, FLOW is the inlet pipeline flow index, and > is the judgment symbol THEN PUMP STATUS=OFF%%THEN is the execution index after the judgment. STATUS is the state of the scheduled water pump object, = is the judgment symbol, and OFF represents the closed state ELSE PUMP STATUS=ON%%ELSE is the execution index after the judgment and is mutually exclusive with THEN. ON represents the open state RULE Orifice%%Defines the name of the orifice gate scheduling rule. RULE is the index of the scheduling rule name, and Orifice is the orifice gate object to be scheduled IF NODE Storage Volume>=Wmax%%Judges the water volume in the rainwater storage tank. IF is the judgment index, NODE is the rainwater storage tank index, Storage Volume is the rainwater storage tank water volume value index, >= is the judgment symbol, and Wmax is the warning water volume threshold of the rainwater storage tank THEN ORIFICE SETTING = 1% %ORIFICE is the object to be scheduled, SETTING is the state of the orifice gate object to be scheduled, and = is the judgment symbol, where 1 means all orifice gates are open. ELSE ORIFICE SETTING = 0%%0 means all orifice gates are closed; The above rule statement is divided into two parts: one part controls the opening and closing of the pump unit (4), and the other part controls the opening and closing of the orifice gate (5). The rule statement controlling the opening and closing of the pump unit (4) starts with "RULE PUMP". During the initial rainwater storage project's water quantity and quality simulation, the storage tank is used as a node, and "NODE Storage Volume" represents the real-time storage capacity of the storage tank. When the real-time storage capacity of the storage tank is less than the set storage capacity Wmax1, and "LINK FLOW>0" indicates that the inflow rate is greater than 0, the status of the pump unit "PUMP STATUS" is closed. Otherwise, the status of the pump unit (4) is open. This is used to digitally represent the peak-shaving effect of the initial rainwater storage project on water quantity and pollutants during the rainfall. On the other hand, the rule statement controlling the opening and closing of the orifice gate (5) starts with "RULE Orifice". During the initial rainwater storage project's water quantity and quality simulation, the real-time storage capacity of the storage tank "NODE Storage Volume" is used as a node. When the volume is greater than the maximum storage capacity Wmax, in order to prevent the rainwater storage tank from overflowing, the orifice gate (5) is opened urgently to release the water until the storage tank capacity drops below the maximum storage capacity Wmax.

8. A method for simulating and controlling the water quantity and quality process of an initial rainwater storage project according to claim 6 or 7, characterized in that, When the pump unit is in the open state, the number of pumps started is determined based on the flow rate of the rainwater inlet pipe (1), or the real-time storage capacity change rate of the rainwater storage tank (2), or the purification capacity of the water purification node (6) for different water qualities.

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