Water volume and water quality process simulation and regulation and control method for initial rainwater regulation and storage project

Abstract

The invention discloses a water volume and water quality process simulation and regulation and control method for an initial rainwater regulation and storage project. The device has a certain scale of water storage and complete water quality purification functions, and can play roles in peak clipping, peak stagnation, pollution reduction and pollution control in the water quantity and water quality change process in the session precipitation process. According to the method, the hydraulic relation structure model of the initial rainwater regulation and storage project, the water quality purification process of the initial rainwater regulation and storage project and the real-time scheduling mode of the initial rainwater regulation and storage project are constructed, and the water quantity and water quality change process of the initial rainwater regulation and storage project is simulated and deduced; project operation and maintenance personnel are enabled to know the water volume and water quality change conditions of the initial rainwater regulation and storage project in the imminent session rainfall process in advance, a regulation and control plan is formed through simulation deduction, and then the peak values of runoff and pollution load entering a river are reduced and lagged in the actual operation process. The method has a good effect in practical application.

Description

Technical Field

[0001] The present invention relates to a method for simulating and regulating the water quantity and water quality process of an initial rainwater storage project, which is used for simulating and regulating the water quantity and water quality process of an initial rainwater storage project in an urban area. Background Art

[0002] Accurately carrying out the deduction and regulation of the water quantity and water quality of the initial rainwater storage project and providing a reliable preview plan for the actual operation and maintenance work are important guarantees for the long-term operation and maintenance of the initial rainwater storage project. There are three difficulties in the deduction and regulation of the water quantity and water quality of the initial rainwater storage project: First, the hydraulic relationship is complex. The hydraulic relationship inside the initial rainwater storage project is restricted by various types of hydraulic structures such as pipelines, pumps, and gates. The transmission paths of its water quantity and pollutants are diverse. How to accurately depict the transmission paths of the water quantity and pollutants in the initial rainwater storage project under different scenarios is the prerequisite for carrying out the deduction work of the water quantity and water quality. Second, the water quality purification process is complex. There are multiple complex water quality purification treatment processes inside the initial rainwater storage project, and there are many factors affecting the concentration of the effluent water quality. How to accurately reflect the dynamic reduction effect of the initial rainwater storage project on pollutants is a necessary condition for carrying out the deduction work of the water quantity and water quality. Third, the real-time regulation is difficult. The initial rainwater storage project needs to dynamically adjust the opening and closing times of the pump units and gates according to the precipitation conditions and the storage capacity of the storage tank. How to accurately reflect the storage effect of the initial rainwater storage project on the water quantity and pollutants during the precipitation process is an important means for carrying out the water quantity and water quality regulation work.

[0003] The existing technology has solved the problems of simulating and controlling the water quantity and water quality of the initial rainwater storage project in urban areas to a certain extent. However, in the face of the complex hydraulic connection, water quality purification process and real-time regulation requirements of the initial rainwater storage project in urban areas, there are still many problems in the existing technology, which are specifically described as follows:

[0004] First, the initial rainwater storage project in urban areas has a complex hydraulic relationship, and when the storage tank overflows, the water quantity and pollutants will have different flow paths. Specifically, when the storage tank does not overflow, the incoming water quantity and pollutants will first enter the storage tank, and after being treated by water quality purification, they will be discharged into the river by the pump unit; when the storage tank overflows, to ensure the overall safety of the project, the incoming water quantity and pollutants will directly be quickly discharged into the river through the orifice gate to reduce the pressure on the initial rainwater storage tank. The existing technology adopts a series hydraulic connection. Whether the storage tank overflows or not, the flow paths of the water quantity and pollutants are single and cannot reflect the actual hydraulic relationship of the initial rainwater storage tank.

[0005] Second, the initial rainwater storage project in urban areas has a complex water quality purification process, and this purification process is non-linear and dynamic. Specifically, the initial rainwater storage tank project has many processes such as coarse grids, physical sedimentation, and redox reactions. The water quality purification result is not only related to the incoming concentration, but also closely related to the hydraulic influencing factors of each treatment process, such as hydraulic retention time, water depth, flow velocity, etc. In the existing technology, when generally carrying out the process deduction of the water volume and water quality of the initial rainwater storage project, the initial rainwater storage project is generalized as a uniform mixer, and the water quality purification function of the initial rainwater storage project is characterized solely by the pollution load removal rate during engineering design. This generalization method not only ignores the multiple water quality purification processes inside the initial rainwater storage tank, but also lacks the dynamic regulation effect of the initial rainwater storage tank on the pollution load.

[0006] Third, the initial rainwater storage project in urban areas has the practical need for real-time regulation, and this practical need requires real-time regulation according to the water depth of the storage tank. Therefore, the requirements for the real-time performance and operability of the regulation method are extremely high. In the existing technology, when generally carrying out the process regulation of the water volume and water quality of the initial rainwater storage project, the opening and closing water depths of the pump unit are set to regulate the drainage and sewage discharge process of the initial rainwater storage project, but this regulation process is very different from the actual situation. During the actual operation of the initial rainwater storage project, when there is no overflow during a rainfall event, the rainwater is generally stored in the storage tank and the initial rainwater is gradually purified and discharged into the river after the rain; when there is an overflow during a rainfall event, the overflow water volume generally needs to be quickly discharged into the river to reduce the damage to the project itself. Summary of the Invention

[0007] The purpose of the present invention is to propose a method for simulating and regulating the water volume and water quality process of an initial rainwater storage project, which is used for simulating and regulating the water volume and water quality process of the initial rainwater storage project in urban areas.

[0008] To achieve the above purpose, the technical solution of the present invention is:

[0009] Construct a hydraulic relationship structure model of the initial rainwater storage project, construct the water quality purification process of the initial rainwater storage project, and construct the real-time scheduling method of the initial rainwater storage project, where:

[0010] The construction of the hydraulic relationship structure model of the initial rainwater storage project: is to construct the equipment hydraulic relationship structure of the initial rainwater storage project. The equipment hydraulic relationship structure adopts the combined mode of orifice gate and pump linkage, including the control nodes of the water volume and pollutant transmission process;

[0011] The water quality purification process of the constructed initial rainwater storage project: Based on the hydraulic relationship structure of the equipment, a multivariate function relationship among the effluent water quality concentration, influent water quality concentration, hydraulic retention time, and water depth elements is established. Based on the water volume balance control equation, a calculation formula for the effluent water quality concentration is proposed, and the water quality purification process inside the initial rainwater storage project is characterized by using the calculation formula for the effluent water quality concentration;

[0012] The real-time scheduling method of the constructed initial rainwater storage project: Based on the hydraulic relationship structure and water quality purification process of the equipment, the transfer process of the influent and effluent water volume and quality of the initial rainwater storage project is dynamically and real-timely regulated to reduce and delay the peak values of the rainwater runoff into the river and the peak values of the initial rainwater pollution load.

[0013] Furthermore, the hydraulic relationship structure of the equipment includes: the rainwater inlet pipeline, the rainwater storage tank, the outlet pipeline, the pump unit, the orifice gate, the water quality purification node, the outlet node, and the outlet pipeline; among them: the rainwater inlet pipeline is connected to the rainwater storage tank, the outlet pipeline of the rainwater storage tank is connected to the pump unit, the pump unit is provided with a plurality of pumps arranged in parallel, the outputs of the plurality of pumps are collected at the water quality purification node, the water quality purification node is then connected to the outlet node, the rainwater storage tank is provided with an overflow port, and 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 two-way pump gate.

[0014] Furthermore, during the process of a precipitation event:

[0015] When the rainwater storage tank does not overflow, the influent water volume and pollutants flow into the rainwater storage tank through the rainwater inlet pipeline, and the pump unit pumps out the rainwater in the rainwater storage tank from the outlet pipeline and transports it to the water quality purification node to reduce pollutants, and finally discharges it into the river through the outlet node and the outlet pipeline;

[0016] When the rainwater storage tank overflows, the overflow water volume and pollutants flow directly into the outlet node through the orifice gate and then enter the river through the outlet pipeline.

[0017] Furthermore, the rainwater inlet pipeline and the outlet pipeline adopt circular concrete pipelines, the shape of the rainwater storage tank is a cuboid, and the volume is determined by the actual engineering design storage capacity; the pump unit is based on the pumping capacity of the pumps designed for 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 pollution load removal ratio of the initial rainwater storage tank.

[0018] Furthermore, the water volume balance control equation of the equipment is:

[0019]

[0020] In the formula:

[0021] W t+Δt and W t represent the flow rates of the rainwater inlet pipeline and the rainwater storage tank at times t+Δt and t, in m 3 / s, or the head of the pump unit, in m;

[0022] S 1 and S 2 respectively represent the cross-sectional areas of the rainwater inlet pipeline;

[0023] WL 1 and WL 2 respectively represent the water levels at the front and back ends of the rainwater storage tank and the pump unit;

[0024] is the average flow velocity of the rainwater inlet pipeline at time t, in m 3 / s, the average hydraulic radius, in m, and the average cross-sectional area, in m 2 ;

[0025] L is the length of the rainwater inlet pipeline, in m;

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

[0027] g is the acceleration due to gravity, with a value of 9.80, in m / s 2 ;

[0028] The water quality concentration calculation formula is:

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

[0030] Where:

[0031] C out and C in respectively represent the influent and effluent water quality concentrations of the initial rainwater storage project;

[0032] a is a constant coefficient, determined according to the pollutant category;

[0033] b is a constant coefficient;

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

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

[0036] Further, b is set to 0.99. When the pollutant type is chemical oxygen demand, a is 1; when the pollutant type is total phosphorus or ammonia nitrogen, a is 0.01.

[0037] Further, the dynamic real-time regulation includes: when the real-time storage volume of the rainwater storage tank is less than the highest warning water level, the state of the water pump unit 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 is greater than the highest warning water level, the orifice gate is opened for discharging until the storage volume of the rainwater storage tank drops 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 water pump object to be scheduled

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

[0041] AND LINK FLOW>0%%AND is juxtaposed with the IF judgment index and is a supplement to the IF judgment index. LINK is the index of the incoming pipeline, FLOW is the index of the incoming pipeline flow, 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 and is mutually exclusive with THEN. 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 orifice gate object to be scheduled

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

[0046] THEN ORIFICE SETTING=1%%ORIFICE is the object to be scheduled, 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 that the orifice gate is fully closed

[0048] The above rule statements are divided into two parts. One part controls the opening and closing of the pump unit, and the other part controls the opening and closing of the orifice gate. Among them, the rule statements for controlling the opening and closing of the pump unit start with "RULE PUMP". During the water quantity and water quality deduction process of the initial rainwater storage project, the storage tank is regarded as a node, and the real-time storage capacity of the storage tank is represented by "NODE Storage Volume". When the real-time storage capacity of the storage tank is less than the set storage capacity Wmax1 of the storage tank, and "LINK FLOW>0" represents that the influent flow is greater than 0, the status of the pump unit "PUMP STATUS" is in the closed state; otherwise, the status of the pump unit is in the open state, which is used to digitally twin the peak shaving effect of the initial rainwater storage project on water quantity and pollutants during the precipitation period. On the other hand, for controlling the opening and closing of the orifice gate, it starts with "RULE Orifice". During the water quantity and water quality deduction process of the initial rainwater storage project, when the real-time storage capacity of the storage tank "NODE Storage Volume" is greater than the maximum storage capacity Wmax, in order to prevent the rainwater storage tank from overflowing, the orifice gate is opened emergently for drainage until the storage capacity of the storage tank drops below the maximum storage capacity Wmax.

[0049] Furthermore, when the status of the pump unit is in the open state, the number of pumps started is determined according to the flow rate of the rainwater inlet pipeline, or the change rate of the real-time storage capacity of the rainwater storage tank, or the purification ability of the water quality purification node for different water qualities.

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

[0051] 1. In terms of hydraulic relationship construction, the prior art generally generalizes the initial rainwater storage project into a storage tank when carrying out the deduction process of the water quantity and water quality process of the initial rainwater storage project. It only considers the water storage situation of the initial rainwater storage project in reality, and ignores the water quality purification and the regulation of water quantity and pollutants of the initial rainwater storage project, which leads to the problem that the water quantity and water quality change process of the initial rainwater storage project is not accurately grasped and calculated in the current technology. In response to this problem, the present invention cleverly uses hydraulic structures such as pipelines, reservoirs, water pumps, and orifice gates to achieve digital twin mapping of the initial rainwater storage project. Through pipe networks, storage tanks, water pumps and other structures, the water volume transmission and pollutant reduction process of the storage tank without overflow is deduced. Through pipe networks, storage tanks, orifice gates and other structures, the process of emergency water discharge of the storage tank under overflow is deduced. The water volume and pollutant transmission process of the initial rainwater storage project deduced by this hydraulic relationship construction method is highly consistent with the actual situation.

[0052] 2. In terms of water quality purification, the prior art generally generalizes the initial rainwater storage project into a uniform mixer during the deduction of the water quantity and quality process of the initial rainwater storage project, and uses the pollution load removal rate during engineering design to characterize the water quality purification function of the initial rainwater storage project. 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 pollution load by the initial rainwater storage tank. In response to this problem, the present invention is based on a large amount of measured data on the inlet and outlet water quality of the initial rainwater storage tank, and establishes a functional relationship between the factory water quality concentration and the inlet water quality, the water depth of the reservoir, and the hydraulic retention time of the reservoir, accurately describing the dynamic regulation process of the initial rainwater storage project on the factory water quality.

[0053] 3. In terms of real-time scheduling, the prior art generally uses the start-stop water depth of the water pump unit to adjust the drainage and sewage discharge process of the initial rainwater storage project during the process of regulating the water quantity and water quality of the initial rainwater storage project, but this regulation process is very different from the actual situation. In the actual operation of the initial rainwater storage project, if there is no overflow during the precipitation process, the rainwater is generally stored in the reservoir, and the initial rainwater is gradually purified and discharged into the river after the rain; if overflow occurs during the precipitation process, it is generally necessary to quickly discharge the overflow water into the river to reduce the damage to the project itself. Therefore, the present invention aims at the deficiencies of the prior art and integrates the actual operation rules. In the process of water quantity and water quality deduction of the initial rainwater storage project, a real-time control strategy is introduced to realize the reverse hydrological process of "intercepting water and sewage in the rain, and replenishing clean water after the rain", which is highly consistent with the actual operation scheduling rules.

[0054] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 Real-time regulation flowchart of the initial rainwater storage project;

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

[0057] Figure 3 Taking the 2-hour precipitation with a recurrence interval of 0.5 years as an example, the water quantity deduction and regulation result diagram of the initial rainwater storage project;

[0058] Figure 4 Taking the 2-hour precipitation with a recurrence interval of 0.5 years as an example, the water quality deduction and regulation result diagram of the initial rainwater storage project.

[0059] In the figure: 1 rainwater inlet pipeline, 2 rainwater storage tank, 3 outlet pipeline, 4 pump unit, 5 orifice gate, 6 water quality purification node, 7 outlet node, 8 outlet pipeline, Figure 3 and Figure 4 In [figure name] and [figure name], 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 invention. Detailed implementation manners

[0060] Example 1:

[0061] A method for simulating and regulating the water quantity and quality processes of an initial rainwater storage project, which is used for the initial rainwater storage project in urban areas. As shown in the attached Figure 1 Attached Figure 2 figure, the method includes: 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 method of the initial rainwater storage project, wherein:

[0062] The constructing of the hydraulic relationship structure model of the initial rainwater storage project: is to construct the equipment hydraulic relationship structure of the initial rainwater storage project. The equipment hydraulic relationship structure adopts the combined mode of orifice gate and pump linkage, and includes control nodes for the processes of water quantity and pollutant transmission;

[0063] The constructing of the water quality purification process of the initial rainwater storage project: is to establish a multivariate function relationship formula of the outlet water quality concentration with the inlet water quality concentration, hydraulic retention time, and water depth elements on the basis of the equipment hydraulic relationship structure, and propose an outlet water quality concentration calculation formula on the basis of the water quantity balance formula. The outlet water quality concentration calculation formula is used to characterize the water quality purification process inside the initial rainwater storage project, and expresses the multivariate function relationship of the outlet water quality concentration with the inlet water quality concentration, hydraulic retention time, and water depth elements;

[0064] The real-time scheduling method for constructing the initial rainwater storage project: Based on the hydraulic relationship structure of the equipment and the water quality purification process, it dynamically and real-timely regulates the transfer process of the water volume and water quality of the initial rainwater storage project's inflow and outflow, reducing and delaying the peak values of the rainwater runoff into the river and the peak load of the initial rainwater pollution.

[0065] Embodiment 2:

[0066] This embodiment is a refinement of Embodiment 1. This embodiment cleverly uses hydraulic structures such as pipe gates and pumps to accurately depict the water volume and pollutant transfer processes of the initial rainwater storage project in different scenarios such as no overflow and overflow, clarifies the setting principles and methods of key nodes during the digital twin of the initial rainwater storage project, as well as the key control equations in the water volume and water quality deduction process. This innovation overcomes the problem in the prior art that the complex hydraulic relationship of the initial rainwater storage project is depicted vaguely, resulting in unclear water volume and pollutant discharge paths.

[0067] As Figure 2 shown, the hydraulic relationship structure of the equipment includes: the rainwater inlet pipe 1, the rainwater storage tank 2, the outlet pipe 3 of the tank, the pump unit 4, the orifice gate 5, the water quality purification node 6, the outlet node 7, and the outlet pipe 8; among them: 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 provided with a plurality of pumps arranged in parallel according to the actual number of pumps, the outputs of the plurality of pumps are gathered at the water quality purification node 6, the water quality purification node 6 is then connected to the outlet node 7, the rainwater storage tank 2 is provided with an overflow port, and the overflow port 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 two-way pump gate.

[0068] Embodiment 3:

[0069] This embodiment is a refinement of Embodiment 2. As Figure 2 combined with Figure 1 shown, during the process of a precipitation event, when there is no overflow in the rainwater storage tank 2, the inflow water volume and pollutants enter the rainwater storage tank 2 through the rainwater inlet pipe 1, the pump unit 4 pumps out the rainwater in the rainwater storage tank 2 from the outlet pipe 3 and transports it to the water quality purification node 6 to reduce pollutants, and finally discharges into the river through the outlet node 7 and the outlet pipe 8. At the same time, a part of the purified water that reduces pollutants is separated at the outlet node 7 and returns to the rainwater storage tank 2 through the orifice gate 5 and the overflow port to dilute the rainwater in the rainwater storage tank 2. Summarized description: When there is no overflow in the rainwater storage tank 2, the water volume and water quality transfer path is rainwater inlet pipe 1 → rainwater storage tank 2 → outlet pipe 3 of the tank → pump unit 4 → water quality purification node 6 → outlet node 7 → outlet pipe 8.

[0070] During the precipitation process, when the rainwater storage tank 2 overflows, the water volume and pollutants overflowing from the overflow port directly enter the factory outlet node 7 through the orifice gate 5, and then enter the river through the factory outlet pipeline 8. Summary description: When the rainwater storage tank 2 overflows, the water volume and water quality transmission path is the rainwater inlet pipeline 1 → rainwater storage tank 2 → orifice gate 5 → factory outlet node 7 → factory outlet pipeline 8.

[0071] Example 4:

[0072] This example is a refinement of Example 2. The rainwater inlet pipeline 1 and the factory outlet pipeline 8 adopt circular concrete pipelines. The shape of the rainwater storage tank 2 is a cuboid, and the volume is determined by the actual engineering design storage capacity, that is: determined by the multivariate function relationship in the water balance control equation and the water quality concentration calculation formula; the water pump unit 4 should be in accordance with the pumping capacity of the water pump designed for the initial rainwater storage tank, and the water quality treatment capacity of the water quality purification node 6 should be consistent with the water quality treatment process and pollution load removal ratio of the initial rainwater storage tank.

[0073] Example 5:

[0074] This example is a refinement of Example 1, where:

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

[0076]

[0077] In the formula:

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

[0079] S 1 、S 2 respectively represent the cross-sectional areas of the rainwater inlet pipeline 1;

[0080] WL 1 、WL 2 respectively represent the water levels at the front and rear ends of the rainwater storage tank 2 and the water pump unit 4;

[0081] is the average flow velocity of the rainwater inlet pipeline 1 at time t, m 3 / s, average hydraulic radius, m, 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 ; where n is the Manning roughness coefficient;

[0084] g is the acceleration due to gravity, with a value of 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] Where:

[0088] C out and C in represent the influent and effluent water quality concentrations of the initial rainwater storage project respectively;

[0089] a is a constant coefficient, determined according to the pollutant category. 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;

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

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

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

[0093] The water volume balance control equation and water quality concentration calculation formula of the equipment constitute a digital model for simulating the water volume and water quality process in the initial rainwater storage. By changing the multivariate function variables in the water volume balance control equation and water quality concentration calculation formula, it characterizes the dynamic regulation process of various water quality purification processes on the effluent water quality concentration, overcoming the problem of static evaluation of the water quality of the initial rainwater storage project in the existing technology.

[0094] The above embodiments have:

[0095] In terms of the construction method of the hydraulic relationship structure of the initial rainwater storage project, based on the existing hydrological, hydrodynamic and water quality mechanism models, it cleverly uses hydraulic structures such as pipelines, reservoirs, pumps, and orifice gates to realize the digital twin mapping of the initial rainwater storage project, making its water volume and pollutant transmission processes consistent with the actual situation, and overcoming the problem of incorrect water volume and pollutant transmission paths caused by the simplification and singleization of the hydraulic relationship in the water volume and water quality simulation process of the current initial rainwater storage tank.

[0096] In terms of the construction method of the water quality purification process for the initial rainwater storage project, based on a large amount of measured water volume and water quality data, a functional relationship was established among the effluent water quality, influent water quality, water depth of the storage tank, and hydraulic retention time of the storage tank, so that the effluent water quality is consistent with the degree of pollution load reduction of the actual initial rainwater storage tank, overcoming the problem that the effluent water quality of the current initial rainwater storage tank deviates too much from the actual situation due to the simple pollution load removal rate method in water quality purification.

[0097] In terms of the construction of the real-time scheduling method for the initial rainwater storage project, a real-time control strategy was adopted. A rule controller was added during the simulation process of the water volume and water quality of the initial rainwater storage project to complete the real-time control of the pump unit and orifice gate in the initial rainwater storage project, realizing the reverse hydrological process of "intercepting pollutants during rain and replenishing clean water after rain" in the initial rainwater storage project, overcoming the problem that the effluent water volume and quality of the current initial rainwater storage project deviate too much from the actual situation due to the adoption of the one-way static control rule of setting the pump starting water level.

[0098] Example 6:

[0099] This example is a refinement of Example 1. 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 pump unit 4 is in the closed state; otherwise, the state of the pump unit is in 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 for drainage until the storage capacity of the rainwater storage tank 2 drops below the highest warning water level.

[0100] Example 7:

[0101] Based on the real-time control strategy, during the calculation process of the hydrodynamic water quality of the model, a real-time control regulator was added to schedule the opening and closing modes of the pump unit 4 and the orifice gate 5 through control rules, so as to achieve the purpose of real-time scheduling of the initial rainwater storage tank project; the implementation control process of the initial rainwater storage project is completed through the real-time control regulator. The control rule statements inside the real-time control regulator are written in the mode of "named variable" plus "variable relationship value" plus "variable relationship variable", and are called in the form of if-then-else. For the method of deducing the water volume and water quality process of the initial rainwater storage project provided in this example, the following rule statements are provided for the dynamic real-time scheduling of the initial rainwater storage project:

[0102] RULE PUMP%%Defines the name of the pump scheduling rule. RULE is the index of the scheduling rule name, and PUMP is the pumped water object

[0103] IF NODE Storage Volume < Wmax %% Determine 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

[0104] AND LINK FLOW > 0 %% AND is parallel to 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

[0105] THEN PUMP STATUS = OFF %% THEN is the execution index after the judgment. STATUS is the status of the dispatching 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 judgment, and it is mutually exclusive with THEN. ON represents the open state

[0107] RULE Orifice %% Define the name of the orifice gate dispatching rule. RULE is the dispatching rule name index, and Orifice is the orifice gate object to be dispatched

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

[0109] THEN ORIFICE SETTING = 1 %% ORIFICE is the object to be dispatched, SETTING is the status of the dispatching orifice gate object, = is the judgment symbol, and 1 represents that all orifice gates are opened

[0110] ELSE ORIFICE SETTING = 0 %% 0 represents that all orifice gates are closed

[0111] The above rule statements are 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. Among them, the rule statement for controlling the opening and closing of the pump unit 4 starts with "RULE PUMP". During the water quantity and water quality deduction process of the initial rainwater storage project, the storage tank is regarded as a node, and the real-time storage capacity of the storage tank is represented by "NODE Storage Volume". When the real-time storage capacity of the storage tank is less than the set storage capacity Wmax1 of the storage tank, and "LINK FLOW>0" indicates that the incoming plant flow is greater than 0, the status of the pump unit "PUMP STATUS" is in the closed state; otherwise, the status of the pump unit 4 is in the open state, which is used to digitally twin the peak shaving effect of the initial rainwater storage project on water quantity and pollutants during the rainfall event. On the other hand, for controlling the opening and closing of the orifice gate 5, it starts with "RULE Orifice". During the water quantity and water quality deduction process of the initial rainwater storage project, when the real-time storage capacity of the storage tank "NODE Storage Volume" is greater than the maximum storage capacity Wmax, to prevent the rainwater storage tank from overflowing, the orifice gate 5 is opened emergently for discharging until the storage capacity of the storage tank drops below the maximum storage capacity Wmax.

[0112] Embodiment 8:

[0113] This embodiment is a further refinement based on Embodiment 7 or 8. When the status of the pump unit is in the open state, the number of pumps started is determined according to the flow rate of the rainwater incoming pipeline 1, or the change rate of the real-time storage capacity of the rainwater storage tank 2, or the purification ability of the water quality purification node 6 for different water qualities.

[0114] The comparison between the technical solutions of the above embodiments and the prior art demonstrates the advantages of this embodiment, as shown in Appendix Figure 3 Appendix Figure 4 . Compared with the prior art, an initial rainwater storage project water quantity and water quality process simulation, deduction and regulation method provided by this embodiment has good application effects in three aspects: 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 project into a storage tank when carrying out the deduction of the water quantity and water quality process of the initial rainwater storage project. It only considers the water storage situation of the initial rainwater storage project in reality, and ignores the water quality purification and the regulation of water quantity and pollutants of the initial rainwater storage project, which leads to the problem that the water quantity and water quality change process of the initial rainwater storage project is not accurately grasped and calculated in the current technology. In response to this problem, the present invention cleverly uses hydraulic structures such as pipelines, reservoirs, water pumps, and orifice gates to achieve digital twin mapping of the initial rainwater storage project. Through pipe networks, storage tanks, water pumps and other structures, the water volume transmission and pollutant reduction process of the storage tank without overflow is deduced. Through pipe networks, storage tanks, orifice gates and other structures, the process of emergency water discharge of the storage tank under overflow is deduced. The water volume and pollutant transmission process of the initial rainwater storage project deduced by this hydraulic relationship construction method is highly consistent with the actual situation.

[0116] Second, in terms of water quality purification, the prior art generally generalizes the initial rainwater storage project into a uniform mixer during the deduction of the water quantity and quality process of the initial rainwater storage project, and uses the pollution load removal rate during engineering design to characterize the water quality purification function of the initial rainwater storage project. 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 pollution load by the initial rainwater storage tank. In response to this problem, the present invention is based on a large amount of measured data on the inlet and outlet water quality of the initial rainwater storage tank, and establishes a functional relationship between the factory water quality concentration and the inlet water quality, the water depth of the reservoir, and the hydraulic retention time of the reservoir, accurately describing the dynamic regulation process of the factory water quality by the initial rainwater storage project.

[0117] Third, in terms of real-time scheduling, the prior art generally uses the start-stop water depth of the water pump unit to adjust the drainage and sewage process of the initial rainwater storage project during the process of regulating the water quantity and quality of the initial rainwater storage project, but this regulation process is very different from the actual situation. In the actual operation of the initial rainwater storage project, if there is no overflow during the precipitation process, the rainwater is generally stored in the reservoir, and the initial rainwater is gradually purified and discharged into the river after the rain; if overflow occurs during the precipitation process, it is generally necessary to quickly discharge the overflow water into the river to reduce the damage to the project itself. Therefore, this patent targets the deficiencies of the prior art and combines the actual operation rules. In the process of water quantity and quality deduction of the initial rainwater storage project, a real-time control strategy is introduced, and a controller is added to the iterative calculation of water quantity and quality. By writing control rule statements, the reverse hydrological process of "intercepting water and sewage in the rain and replenishing clean water after the rain" is realized, which is highly consistent with the actual operation scheduling rules.

[0118] Taking the 2-hour precipitation with a return period of 0.5 years as an example, the water volume deduction and regulation of the initial rainwater storage project are as shown in the attached figure.Figure 3 , water quality deduction and regulation are as attached Figure 4 , in the figure, 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 this invention patent. It can be seen that, compared with the prior art, the water quantity peak value of this invention patent lags behind the prior art by 4 hours, and the water quality concentration peak value lags behind the prior art by 4.3 hours. Moreover, the water quality concentration peak value is reduced by 32.4% compared with the prior art, which further illustrates that the water quantity and quality deduction and regulation method for the initial rainwater storage project provided by this invention patent fully exerts the functions of the rainwater storage tank capacity in terms of water quantity storage and water quality dilution, and is highly consistent with the scheduling rule of storing first and discharging later in the actual project.

Claims

1. A method for simulating and regulating the water quantity and quality process of an initial rainwater storage project, which is used for an initial rainwater storage project in an urban area, and is characterized in that: The method comprises: constructing a hydraulic relationship structure model of an initial rainwater regulation and storage project, constructing a water quality purification process of the initial rainwater regulation and storage project, and constructing a real-time dispatching method of the initial rainwater regulation and storage project, wherein: The hydraulic relationship structure model for constructing the initial rainwater regulation and storage project is to construct the equipment hydraulic relationship structure of the initial rainwater regulation and storage project, and the equipment hydraulic relationship structure adopts a linkage combination of orifice gates and water pumps, including control nodes of water volume and pollutant transmission process; The water quality purification process of the initial rainwater storage project is as follows: on the basis of the hydraulic relationship structure of the equipment, a multivariate function relationship between the effluent water quality concentration and the influent water quality concentration, hydraulic retention time, and water depth elements is established, and a calculation formula for the effluent water quality concentration is proposed on the basis of the water balance control equation. The calculation formula for the effluent water quality concentration is used to characterize the water quality purification process inside the initial rainwater storage project; The real-time dispatching method for constructing the initial rainwater storage project is to dynamically and real-time regulate the transfer process of the inflow and outflow water quality of the initial rainwater storage project on the basis of the hydraulic relationship structure of the equipment and the water quality purification process, so as to reduce and delay the peak value of rainwater runoff into the river and the peak value of initial rainwater pollution load.

2. The method for simulating and controlling the water quantity and quality process of an initial rainwater storage project according to claim 1 is characterized in that: The hydraulic relationship structure of the equipment comprises: a rainwater inlet pipe (1), a rainwater storage tank (2), an outlet pipe (3), a water pump unit (4), an orifice gate (5), a water quality purification node (6), an outlet node (7), and an 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 water pump unit (4), the water pump unit (4) is provided with a plurality of parallel water pumps, the outputs of the plurality of 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) via 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 two-way 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 is characterized in that: During the precipitation event: When the rainwater storage tank (2) does not overflow, the inflow water and pollutants flow into the rainwater storage tank (2) through the rainwater inflow pipe (1), and the water pump unit (4) pumps rainwater from the rainwater storage tank (2) through the outflow pipe (3) and transports it to the water purification node (6) to reduce pollutants, and finally discharges the rainwater into the river through the outflow node (7) and the outflow pipe (8); When the rainwater storage tank (2) overflows, the water and pollutants overflowing from the overflow outlet directly enter the outlet node (7) through the orifice gate (5), and then enter the river through the outlet pipeline (8).

4. The method for simulating and controlling water quantity and quality processes of an initial rainwater storage project according to claim 2 is characterized in that: 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, 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 the pollution load removal ratio of the initial rainwater storage tank.

5. The method for simulating and regulating the water quantity and water quality process of an initial rainwater storage project according to claim 1, characterized in that The water volume balance control equation of the equipment is: In the formula: W t+Δt , W t represents the flow rate of rainwater inlet pipeline (1) and rainwater storage tank (2) at time t+Δt, m 3 / s, or the water head of the pump unit (4), m; S1 and S2 respectively represent the cross-sectional areas of the rainwater inlet pipeline (1); WL1 and WL2 respectively represent the water levels at the front and rear ends of the rainwater storage tank (2) and the water pump unit (4); is the average flow rate of the rainwater inlet pipe (1) at time t, m 3 / s, average hydraulic radius, m, average water-passing cross-sectional area, m 2 ; L is the length of the rainwater inlet pipeline (1), in m; M=g(n / 1.49) 2 ; n is the Manning roughness coefficient; g is the acceleration due to gravity, which is 9.80, m / s 2 ; The water quality concentration calculation formula is: C out =a+(C in -a)*EXP[(-b / 3600)*(DT / WD)] Where: C out , C in They represent the inlet and outlet water quality concentrations of the initial rainwater storage project respectively; a is a constant coefficient, determined according to the pollutant category; b is a constant coefficient; DT represents the hydraulic retention time inside the rainwater storage tank, in h; WD represents the water depth inside the rainwater storage tank, in m.

6. The method for simulating and controlling water quantity and quality processes of a rainwater storage project according to claim 5 is characterized in that: 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.

7. The method for simulating and controlling water quantity and quality processes of a rainwater storage project according to claim 1 is characterized in that: 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 for drainage until the storage capacity of the rainwater storage tank (2) drops below the highest warning water level.

8. The method for simulating and controlling water quantity and quality processes of a rainwater storage project according to claim 1 is 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%% Same as above THEN ORIFICE SETTING=1%%ORIFICE is the object of scheduling, SETTING is the state of the orifice gate object, = is the judgment symbol, 1 means that 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 water pump unit (4), and the other part controls the opening and closing of the orifice gate (5). The rule statement for controlling the opening and closing of the water pump unit (4) starts with "RULE PUMP". In the process of water quantity and water quality deduction of the initial rainwater storage project, the storage tank is used as a node, and the real-time storage capacity of the storage tank is represented by "NODE Storage Volume". When the real-time storage capacity of the storage tank is less than the set storage capacity Wmax1 of the storage tank, and "LINK FLOW>0" represents that the inflow flow is greater than 0, the state of the water pump unit "PUMP STATUS" is closed, otherwise the state of the water pump unit (4) is open, which is used for the digital twin to reduce the peak of water quantity and pollutants in the initial rainwater storage project during the rainfall period. On the other hand, in controlling the opening and closing of the orifice gate (5), it starts with "RULE Orifice". In the process of water quantity and water quality deduction of the initial rainwater storage project, the real-time storage capacity of the storage tank "NODE Storage Volume" is represented by "NODE Storage Volume". 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 discharge the water until the storage tank capacity drops below the maximum storage capacity Wmax.

9. The method for simulating and controlling water quantity and quality processes of a rainwater storage project according to claim 7 or 8, characterized in that: When the water pump unit is in the on state, the number of water pumps started is based on the flow rate of the rainwater inlet pipeline (1), or the real-time storage capacity change speed of the rainwater storage tank (2), or The water purification node (6) determines the purification capacity of different water qualities.

Images