Urban drainage system multi-node cooperative control method based on multi-objective optimization

Abstract

The invention discloses an urban drainage system multi-node cooperative control method based on multi-objective optimization, and relates to the technical field of drainage, and the method comprises the steps: obtaining a water loss coefficient of an urban basic block; analyzing to obtain a water level upper limit and a water level lower limit of the urban basic block; respectively forming a first water storage plot set and a second water storage plot set of the urban basic blocks; analyzing to obtain the water level variation of the city basic block on the day; determining management attributes of the urban basic blocks; forming a drainage set of the urban basic blocks; and forming a drought-resistant set of the urban basic blocks. By obtaining the water loss coefficient of the urban basic block, obtaining the water level variation of the urban basic block on the day and forming the flood drainage set and the drought resistance set of the urban basic block, various factors of planting in each city are considered in a targeted mode, the selected scheme can meet the drought resistance and flood drainage requirements to a large extent, and therefore the method has the advantages that the planting efficiency is improved, and the planting cost is reduced. And the urban drainage system is controlled through the greening vegetation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drainage, in particular to a multi-node cooperative control method for urban drainage system based on multi-objective optimization. BACKGROUND

[0002] Urban drainage is a huge and critical municipal engineering field, which is directly related to urban safety, public health, environmental protection and life quality. Urban drainage system refers to a complete set of engineering facilities for collecting, transporting, processing and discharging urban rainwater and sewage. It can prevent waterlogging, control pollution, protect health, maintain water ecology and support sustainable urban development. There is a large area of green vegetation in the city, which needs additional water during drought. The existing urban drainage system only has the function of waterlogging drainage, and the drainage function adaptation degree is not high. In addition, there is no corresponding regulation and control function for drought in the city. SUMMARY

[0003] To solve the above technical problems, the multi-node cooperative control method for urban drainage system based on multi-objective optimization is provided, which solves the problems in the background art.

[0004] To achieve the above purposes, the technical scheme adopted by the present application is: The multi-node cooperative control method for urban drainage system based on multi-objective optimization comprises: Obtaining at least one city basic block, obtaining green vegetation in the city basic block, obtaining the position and ground surface height of the city basic block; Analyzing the soil and height of the city basic block to obtain the water loss coefficient of the city basic block; Based on the green vegetation in the city basic block, the upper limit and lower limit of the water level of the city basic block are analyzed and obtained; Obtaining at least one water storage block, the water storage block is a reservoir, dam, lake or water pool, and obtaining the real-time water level of the water storage block; According to the connection relationship between the water storage block and the city basic block, the first water storage block set and the second water storage block set of the city basic block are formed respectively, and the gate is installed on the pipeline connecting the water storage block and the city basic block; According to the weather forecast and the water loss coefficient, the water level change of the city basic block on the same day is analyzed; According to the water level change, the management attribute of the city basic block is determined, and the management attribute is waterlogging drainage or drought resistance; When the management attribute of the city basic block is waterlogging drainage, the waterlogging drainage set of the city basic block is formed according to the first water storage block set; When the management attribute of the city basic block is drought resistance, the drought resistance set of the city basic block is formed according to the second water storage block set; According to the formed drainage or drought relief system, the gates of the pipelines connecting the water storage area and the basic urban area are controlled.

[0005] Preferably, obtaining at least one city basic block includes the following steps: The city is evenly divided into at least one urban local block. The surface height and planted green vegetation of the urban local block are counted. Adjacent urban local blocks with the same surface height and the same green vegetation are merged to obtain at least one urban basic block.

[0006] Preferably, the analysis of the soil and height of the urban basic block to obtain the water loss coefficient of the urban basic block includes the following steps: Soil samples are taken from the basic urban blocks to obtain sampling blocks. Each sampling block is a cube with a top area of ​​a unit area. The first moisture content of the sampling block at the current moment is obtained, and the second moisture content of the sampling block after a preset time is obtained. The preset time is set based on experience, and the units of the first and second moisture contents are percentages. The difference between the first moisture content and the second moisture content is multiplied by the volume of the sampling block and then divided by the preset time to obtain the moisture loss rate of the urban basic block. The maximum surface elevation of the basic urban blocks is taken as the first elevation, and the minimum surface elevation of the basic urban blocks is taken as the second elevation. The difference between the first and second elevations is used to obtain the reference elevation. The difference between the surface elevation of the urban basic block and the second elevation is used to obtain the effective elevation of the urban basic block. The effective elevation of the urban basic block is divided by the reference elevation to obtain the effective coefficient of the urban basic block. The effective coefficient of a city's basic block is obtained by multiplying the water loss rate of the city's basic block by the water loss rate of the city's basic block.

[0007] Preferably, the step of analyzing the upper and lower limits of water levels in urban basic blocks based on the green vegetation in the urban basic blocks includes the following steps: Obtain at least one historical planting record of the green vegetation, and use historical planting records of normal growth of the green vegetation as reference planting records; The upper limit of the historical water level of the urban basic block in the planting situation will be used as the upper limit of the water level of the urban basic block; The lower limit of the historical water level of the urban basic block in the reference planting situation will be used as the lower limit of the water level of the urban basic block.

[0008] Preferably, the first set of water-retaining land parcels and the second set of water-retaining land parcels that respectively form the basic urban blocks include the following steps: The water storage plots whose real-time water level is lower than the lower limit of the water level of the basic urban area are aggregated to form the first water storage plot set of the basic urban area. The water storage plots whose real-time water level is higher than the upper limit of the water level of the basic urban area are aggregated to form the second set of water storage plots of the basic urban area.

[0009] Preferably, the step of analyzing the daily water level change of the urban basic block based on weather forecasts and water loss coefficients includes the following steps: Obtain the temperature range of the environment, divide the temperature range of the environment into equal intervals, and obtain at least one identification point; Under the condition that the ambient temperature is equal to the value at the identification point, the amount of water evaporation per unit area of ​​land is obtained. The identification point is paired with the amount of water evaporation per unit area of ​​land and fitted to obtain the evaporation fitting function. Based on the weather forecast, obtain the rainfall and actual temperature for the day. The rainfall is the cumulative depth of the rainfall that day. Substitute the actual temperature of the day into the evaporation fitting function to obtain the actual evaporation. Multiply the actual evaporation by the area of ​​the city's basic block to obtain the total evaporation. The total water loss is obtained by multiplying the water loss coefficient of the basic urban area by the area of ​​the basic urban area. Rainfall is multiplied by the area of ​​the basic urban block to obtain the rainwater volume, and the rainwater volume is multiplied by the water loss coefficient to obtain the retained rainwater volume. Subtracting the total evaporation and total loss from the retained rainfall yields the effective rainfall. Dividing the effective rainfall by the area of ​​the urban basic block yields the daily water level change of the urban basic block.

[0010] Preferably, determining the management attributes of the urban basic block based on the water level change includes the following steps: The predicted water level of the city's basic blocks is obtained by superimposing the initial water level and the water level change of the basic blocks on the same day. If the predicted water level of a basic urban area is greater than the upper limit of the water level of the basic urban area, then the management attribute of the basic urban area is flood drainage. If the predicted water level of a city's basic block is lower than the lower limit of the water level of the city's basic block, then the management attribute of the city's basic block is drought resistance.

[0011] Preferably, the process of forming a drainage set for the urban basic block based on the first set of water storage plots includes the following steps: The average water level of the basic urban area is obtained by taking the average of the upper and lower limits of the water level. Subtracting the average water level of the basic urban area from the predicted water level of the basic urban area yields the required drainage water level of the basic urban area. Multiplying the required drainage water level of the basic urban area by the area of ​​the basic urban area yields the required drainage volume of the basic urban area. The average of the predicted water levels for the basic urban blocks is used to obtain the reference water level; The difference between the reference water level and the real-time water level of the water storage area is multiplied by the area of ​​the water storage area to obtain the drainage capacity of the water storage area. Form at least one drainage scheme, which satisfies that a subset of the first water storage plot set of the urban basic block is used as the first preliminary set of the urban basic block in the drainage scheme; Take the union of the first preliminary set of urban basic blocks in the drainage plan to obtain the first total set. Add up the drainage capacity of the water storage blocks in the first total set to obtain the total drainage capacity. The total amount of water that should be drained from all the basic urban blocks is summed up to obtain the total amount of water that should be drained. Select one of the drainage schemes where the total drainage volume is less than the total drainage capacity as the target drainage scheme, and use the first preliminary set of urban basic blocks in the target drainage scheme as the drainage set of urban basic blocks.

[0012] Preferably, the process of forming a drought-resistant set of urban basic blocks based on the second set of water storage plots includes the following steps: A water threshold is formed by subtracting the predicted water level of the urban basic block from the average water level of the urban basic block to obtain the drought-resistant water level of the urban basic block. The drought-resistant water level of the urban basic block, the area of ​​the urban basic block, and the water threshold are multiplied together to obtain the drought-resistant water volume of the urban basic block. The drought resistance capacity of the water storage plot is obtained by multiplying the difference between the real-time water level and the reference water level by the area of ​​the water storage plot. Form at least one drought relief scheme, which satisfies that a subset of the second water storage plot set of the urban basic block is used as the second preliminary set of the urban basic block in the drought relief scheme; The drought relief length is obtained by summing the pipeline lengths between the basic urban blocks and the water storage plots in the second reserve set of the basic urban blocks. The drought relief lengths in the drought relief schemes are summed to obtain the comprehensive drought relief length. The second preliminary set of urban basic blocks in the drought relief plan is combined to obtain the second total set. The drought relief capacity of the water storage blocks in the second total set is added together to obtain the total drought relief capacity. The total amount of drought-resistant water required for all basic urban blocks is obtained by summing up the drought-resistant water requirements. Select the drought relief plan with a total drought relief capacity greater than the total amount of drought relief required as the reserve drought relief plan, select the reserve drought relief plan with the smallest comprehensive drought relief length as the target drought relief plan, and select the second reserve set of urban basic blocks in the target drought relief plan as the drought relief set of urban basic blocks. The specific threshold for moisture formation is as follows: At least one sampling point is uniformly taken below the surface of the basic urban block. If the difference in historical moisture content measured in spring, summer, autumn and winter does not exceed the allowable measurement error, the sampling point is taken as the target sampling point. The target moisture content is obtained by averaging the historical moisture content measured at the target sampling points in spring, summer, autumn and winter. The minimum value of the target moisture content at at least one target sampling point is used as the moisture threshold.

[0013] Preferably, controlling the gate of the pipeline connecting the water storage plot and the urban basic block includes the following steps: When the management attribute of the urban basic block is drainage, if the real-time water level of the urban basic block exceeds the upper limit of the urban basic block's water level, the gate of the pipeline connecting the water storage plot in the drainage set to the urban basic block will be opened until the real-time water level of the urban basic block is equal to the average water level of the urban basic block, and then the gate will be closed. When the management attribute of the urban basic block is drought resistance, if the real-time water level of the urban basic block is lower than the lower limit of the water level of the urban basic block, the gate of the pipeline connecting the water storage plot in the drought resistance set to the urban basic block will be opened until the real-time water level of the urban basic block is equal to the average water level of the urban basic block, and then the gate will be closed. The real-time water level of the city's basic blocks is obtained as follows: If the surface of a city block is covered by water, the water level of the city block will be used as the real-time water level of the city block. If the surface of the basic urban block is not covered by water, the real-time moisture content at the sampling point is measured. If the real-time moisture content at the sampling point is greater than the moisture threshold, the sampling point is used as a feature sampling point. The maximum height of the feature sampling points is used as the real-time water level of the city's basic blocks.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: By obtaining the water loss coefficient of the basic urban blocks, the upper and lower limits of the water level of the basic urban blocks, the daily water level change of the basic urban blocks, and the drainage and drought resistance sets of the basic urban blocks, the different water loss caused by soil height can be analyzed. This allows for the understanding of the impact of weather on the daily water level change of the basic urban blocks. Furthermore, based on the different types of green vegetation in the basic urban blocks, the limits of drought or flood tolerance of the basic urban blocks can be analyzed. By combining these factors, a management plan for the urban drainage system can be derived. Because it takes into account various planting factors in each city, the selected plan can largely meet the needs of drought resistance and drainage. Since green vegetation covers the entire city, its drainage needs are similar to those of the city; therefore, meeting the drainage control needs of green vegetation can also meet the city's drainage needs. Thus, the urban drainage system can be controlled from multiple perspectives. Attached Figure Description

[0015] Figure 1This is a flowchart illustrating the multi-node collaborative control method for urban drainage systems based on multi-objective optimization according to the present invention. Figure 2 This is a flowchart illustrating the process of analyzing the soil and height of urban basic blocks to obtain the water loss coefficient of urban basic blocks according to the present invention. Figure 3 This is a flowchart illustrating the process of analyzing and obtaining the upper and lower limits of water levels in urban basic blocks based on the green vegetation in urban basic blocks according to the present invention. Figure 4 This is a schematic diagram illustrating the process of forming the first and second water storage plot sets of the urban basic blocks according to the present invention. Figure 5 This is a flowchart illustrating the process of analyzing and obtaining the daily water level change of a basic urban area based on weather forecasts and water loss coefficients, as described in this invention. Figure 6 This is a flowchart illustrating the process of determining the management attributes of urban basic blocks based on water level changes, according to the present invention. Figure 7 This is a schematic diagram of the process of forming a drainage set of urban basic blocks based on the first set of water storage plots according to the present invention; Figure 8 This is a schematic diagram of the process of forming a drought-resistant set of urban basic blocks based on the second water storage plot set according to the present invention; Figure 9 This is a schematic diagram illustrating the process of controlling the gate of the pipeline connecting the water storage plot and the urban basic block according to the present invention. Detailed Implementation

[0016] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0017] Reference Figure 1 As shown, a multi-node collaborative control method for urban drainage systems based on multi-objective optimization includes: Obtain at least one city block, obtain the green vegetation within the city block, and obtain the location and surface elevation of the city block. The soil and height of the urban basic block were analyzed to obtain the water loss coefficient of the urban basic block; Based on the green vegetation in the basic urban blocks, the upper and lower limits of the water level in the basic urban blocks are analyzed and obtained. Obtain at least one water storage site, which can be a reservoir, dam, lake, or pond, and obtain the real-time water level of the water storage site; Based on the connection relationship between the water storage plots and the urban basic blocks, the first water storage plot set and the second water storage plot set of the urban basic blocks are formed respectively, and gates are installed on the pipelines connecting the water storage plots and the urban basic blocks. Based on weather forecasts and water loss coefficients, the daily water level changes in the city's basic blocks were analyzed. Based on the water level change, determine the management attribute of the basic urban area, which is either flood drainage or drought resistance. When the management attribute of the basic urban block is drainage, the drainage set of the basic urban block is formed according to the first water storage block set; When the management attribute of the basic urban block is drought resistance, a drought resistance set of the basic urban block is formed based on the set of the second water storage blocks; According to the formed drainage or drought relief system, the gates of the pipelines connecting the water storage area and the basic urban area are controlled.

[0018] In this plan, the urban drainage system is regulated. The pipes of the urban drainage system are specially designed to connect to the green vegetation in the basic urban blocks, so that drainage can be carried out at these points. At the same time, it also connects to water storage plots to replenish the green vegetation during droughts. Therefore, there is no need for additional special watering of the green vegetation. In urban drainage, regulation is only required during droughts and floods. Normal drainage is sufficient for the rest of the time. Therefore, in this plan, regulation is only required during droughts and floods. During regulation, the basic urban blocks and water storage areas are analyzed to assess water level changes in the basic urban blocks based on varying weather conditions. It's important to note that differences in soil type, elevation, and vegetation within these blocks lead to varying degrees of water loss. Furthermore, the tolerance to drought and flood varies. Therefore, these factors must be considered when controlling rural water conservancy facilities to manage the opening and closing of gates connecting the basic urban blocks and water storage areas, thus addressing drought and flood issues. Water level identification is crucial. During floods, the water level is easily identifiable as the surface of the basic urban blocks is submerged. However, during droughts, the water level is below the surface, making identification more difficult. Currently, there are no established standards for reference; a series of steps will be developed to address this issue in future plans. All the heights and water levels here are statistically obtained with the horizontal plane as the reference plane, which ensures that the measurement standards are consistent.

[0019] Obtaining at least one city basic block includes the following steps: The city is evenly divided into at least one urban local block. The surface height and planted green vegetation of the urban local block are counted. Adjacent urban local blocks with the same surface height and the same green vegetation are merged to obtain at least one urban basic block.

[0020] Reference Figure 2 As shown, the analysis of soil and height of urban basic blocks to obtain the water loss coefficient of urban basic blocks includes the following steps: Soil samples are taken from the basic urban blocks to obtain sampling blocks. Each sampling block is a cube with a top area of ​​a unit area. The first moisture content of the sampling block at the current moment is obtained, and the second moisture content of the sampling block after a preset time is obtained. The preset time is set based on experience, and the units of the first and second moisture contents are percentages. The difference between the first moisture content and the second moisture content is multiplied by the volume of the sampling block and then divided by the preset time to obtain the moisture loss rate of the urban basic block. The maximum surface elevation of the basic urban blocks is taken as the first elevation, and the minimum surface elevation of the basic urban blocks is taken as the second elevation. The difference between the first and second elevations is used to obtain the reference elevation. The difference between the surface elevation of the urban basic block and the second elevation is used to obtain the effective elevation of the urban basic block. The effective elevation of the urban basic block is divided by the reference elevation to obtain the effective coefficient of the urban basic block. The effective coefficient of a city's basic block is obtained by multiplying the water loss rate of the city's basic block by the water loss rate of the city's basic block.

[0021] Here, water loss is partly due to the autonomous flow of water, which is caused by gravity. This can be estimated by analyzing the water loss rate per unit area of ​​land in the basic urban area based on the sampling plots. Since water loss is accomplished through soil infiltration, water loss occurs from high to low. The lower areas bear the weight of the lost water, so the water loss rate is slower at lower areas and faster at higher areas. Therefore, this needs to be considered, which forms the effective coefficient, which is based on the ratio of height difference and satisfies the condition that the effective coefficient at lower areas is less than that at higher areas. A sampling block is a cube obtained by sampling downwards from the surface of the city's basic block, and the top of the sampling block is the surface of the city's basic block.

[0022] Reference Figure 3 As shown, based on the green vegetation in the urban basic block, the analysis of the upper and lower limits of the water level in the urban basic block includes the following steps: Obtain at least one historical planting record of the green vegetation, and use historical planting records of normal growth of the green vegetation as reference planting records; The upper limit of the historical water level of the urban basic block in the planting situation will be used as the upper limit of the water level of the urban basic block; The lower limit of the historical water level of the urban basic block in the reference planting situation will be used as the lower limit of the water level of the urban basic block.

[0023] The upper and lower limits of water levels in urban basic blocks are easy to understand. The upper limit corresponds to the tolerance limit of green vegetation in urban basic blocks to flooding, and it is easy to know that the upper limit of water levels is above the surface of urban basic blocks. The lower limit of water levels corresponds to the tolerance limit of green vegetation in urban basic blocks to drought, and it is easy to know that the lower limit of water levels is below the surface of urban basic blocks.

[0024] Reference Figure 4 As shown, the first and second sets of water storage plots, which respectively form the basic urban blocks, include the following steps: The water storage plots whose real-time water level is lower than the lower limit of the water level of the basic urban area are aggregated to form the first water storage plot set of the basic urban area. The water storage plots whose real-time water level is higher than the upper limit of the water level of the basic urban area are aggregated to form the second set of water storage plots of the basic urban area.

[0025] Reference Figure 5 As shown, based on weather forecasts and water loss coefficients, the analysis of the daily water level change in the city's basic blocks includes the following steps: Obtain the temperature range of the environment, divide the temperature range of the environment into equal intervals, and obtain at least one identification point; Under the condition that the ambient temperature is equal to the value at the identification point, the amount of water evaporation per unit area of ​​land is obtained. The identification point is paired with the amount of water evaporation per unit area of ​​land and fitted to obtain the evaporation fitting function. Based on the weather forecast, obtain the rainfall and actual temperature for the day. The rainfall is the cumulative depth of the rainfall that day. Substitute the actual temperature of the day into the evaporation fitting function to obtain the actual evaporation. Multiply the actual evaporation by the area of ​​the city's basic block to obtain the total evaporation. The total water loss is obtained by multiplying the water loss coefficient of the basic urban area by the area of ​​the basic urban area. Rainfall is multiplied by the area of ​​the basic urban block to obtain the rainwater volume, and the rainwater volume is multiplied by the water loss coefficient to obtain the retained rainwater volume. Subtracting the total evaporation and total loss from the retained rainfall yields the effective rainfall. Dividing the effective rainfall by the area of ​​the urban basic block yields the daily water level change of the urban basic block.

[0026] Rainfall in weather forecasts is usually not measured by volume, but by the cumulative depth of rainwater. The rainfall on a given day may be 0 mm or 100 mm. Therefore, when the rainfall is 0 mm, the water level change is negative due to water loss and evaporation. In other words, the water level change can be either positive or negative.

[0027] Reference Figure 6 As shown, determining the management attributes of a city's basic blocks based on water level changes includes the following steps: The predicted water level of the city's basic blocks is obtained by superimposing the initial water level and the water level change of the basic blocks on the same day. If the predicted water level of a basic urban area is greater than the upper limit of the water level of the basic urban area, then the management attribute of the basic urban area is flood drainage. If the predicted water level of a city's basic block is lower than the lower limit of the water level of the city's basic block, then the management attribute of the city's basic block is drought resistance.

[0028] No action is required if the predicted water level of a city block is between the upper and lower limits of the water level of that city block.

[0029] Reference Figure 7 As shown, based on the first set of water storage plots, the process of forming the drainage system for the basic urban area includes the following steps: The average water level of the basic urban area is obtained by taking the average of the upper and lower limits of the water level. Subtracting the average water level of the basic urban area from the predicted water level of the basic urban area yields the required drainage water level of the basic urban area. Multiplying the required drainage water level of the basic urban area by the area of ​​the basic urban area yields the required drainage volume of the basic urban area. The average of the predicted water levels for the basic urban blocks is used to obtain the reference water level; The difference between the reference water level and the real-time water level of the water storage area is multiplied by the area of ​​the water storage area to obtain the drainage capacity of the water storage area. Form at least one drainage scheme, which satisfies that a subset of the first water storage plot set of the urban basic block is used as the first preliminary set of the urban basic block in the drainage scheme; Take the union of the first preliminary set of urban basic blocks in the drainage plan to obtain the first total set. Add up the drainage capacity of the water storage blocks in the first total set to obtain the total drainage capacity. The total amount of water that should be drained from all the basic urban blocks is summed up to obtain the total amount of water that should be drained. Select one of the drainage schemes where the total drainage volume is less than the total drainage capacity as the target drainage scheme, and use the first preliminary set of urban basic blocks in the target drainage scheme as the drainage set of urban basic blocks.

[0030] Flood drainage and drought relief differ in nature, and therefore require different approaches. When flooding requires drainage, simply opening the corresponding sluice gate is sufficient; the length of the pipeline connecting the water storage area and the urban infrastructure does not affect drainage. However, during droughts, water replenishment is affected by the length of the pipeline connecting the water storage area and the urban infrastructure. The longer the pipeline, the longer the replenishment time, which impacts the timeliness of drought relief and may further affect the yield of the urban infrastructure. Therefore, when forming a flood drainage pool, only drainage schemes with a total drainage volume less than the total drainage capacity are considered. This indicates that the pool can receive the discharged water, and the desired scheme can be selected from among them. Here, the total drainage capacity needs to be calculated. Since water flows from high to low, the total drainage capacity needs to be calculated based on the liquid level difference. When forming a drought relief system, it is necessary not only to consider the comparison between the amount of water required for drought relief and the total drought relief capacity, but also to control the time required for water replenishment, that is, to select the option with the shortest total length of the transmission pipeline. Here, it is also necessary to calculate the drought relief capacity, following the principle that water flows from high to low, and to calculate the drought relief capacity based on the liquid level difference.

[0031] Reference Figure 8 As shown, based on the second set of water storage plots, the drought-resistant set for forming the basic urban block includes the following steps: A water threshold is formed by subtracting the predicted water level of the urban basic block from the average water level of the urban basic block to obtain the drought-resistant water level of the urban basic block. The drought-resistant water level of the urban basic block, the area of ​​the urban basic block, and the water threshold are multiplied together to obtain the drought-resistant water volume of the urban basic block. The drought resistance capacity of the water storage plot is obtained by multiplying the difference between the real-time water level and the reference water level by the area of ​​the water storage plot. Form at least one drought relief scheme, which satisfies that a subset of the second water storage plot set of the urban basic block is used as the second preliminary set of the urban basic block in the drought relief scheme; The drought relief length is obtained by summing the pipeline lengths between the basic urban blocks and the water storage plots in the second reserve set of the basic urban blocks. The drought relief lengths in the drought relief schemes are summed to obtain the comprehensive drought relief length. The second preliminary set of urban basic blocks in the drought relief plan is combined to obtain the second total set. The drought relief capacity of the water storage blocks in the second total set is added together to obtain the total drought relief capacity. The total amount of drought-resistant water required for all basic urban blocks is obtained by summing up the drought-resistant water requirements. Select the drought relief plan with a total drought relief capacity greater than the total amount of drought relief required as the reserve drought relief plan, select the reserve drought relief plan with the smallest comprehensive drought relief length as the target drought relief plan, and select the second reserve set of urban basic blocks in the target drought relief plan as the drought relief set of urban basic blocks. The specific threshold for moisture formation is as follows: At least one sampling point is uniformly taken below the surface of the basic urban block. If the difference in historical moisture content measured in spring, summer, autumn and winter does not exceed the allowable measurement error, the sampling point is taken as the target sampling point. The target moisture content is obtained by averaging the historical moisture content measured at the target sampling points in spring, summer, autumn and winter. The minimum value of the target moisture content at at least one target sampling point is used as the moisture threshold.

[0032] During drought relief, common sense tells us that the distance from the upper limit of the water level to the ground surface in a basic urban area is less than the distance from the lower limit of the water level to the ground surface. This is because the root systems of green vegetation are relatively long and can access water from deeper below the ground surface. Therefore, both the average water level and the predicted water level of a basic urban area are below the ground surface. Thus, subtracting the predicted water level from the average water level of a basic urban area yields the required drought relief water level. However, multiplying the required drought relief water level by the area of ​​the basic urban area results in a combined volume of soil and water. It is necessary to determine the total amount of water in this volume as the required drought relief water volume. The water threshold is the content of sufficient water. Therefore, based on this, the required drought relief water volume can be calculated.

[0033] Reference Figure 9 As shown, controlling the gates of the pipeline connecting the water storage area and the urban infrastructure includes the following steps: When the management attribute of the urban basic block is drainage, if the real-time water level of the urban basic block exceeds the upper limit of the urban basic block's water level, the gate of the pipeline connecting the water storage plot in the drainage set to the urban basic block will be opened until the real-time water level of the urban basic block is equal to the average water level of the urban basic block, and then the gate will be closed. When the management attribute of the urban basic block is drought resistance, if the real-time water level of the urban basic block is lower than the lower limit of the water level of the urban basic block, the gate of the pipeline connecting the water storage plot in the drought resistance set to the urban basic block will be opened until the real-time water level of the urban basic block is equal to the average water level of the urban basic block, and then the gate will be closed. The real-time water level of the city's basic blocks is obtained as follows: If the surface of a city block is covered by water, the water level of the city block will be used as the real-time water level of the city block. If the surface of the basic urban block is not covered by water, the real-time moisture content at the sampling point is measured. If the real-time moisture content at the sampling point is greater than the moisture threshold, the sampling point is used as a feature sampling point. The maximum height of the feature sampling points is used as the real-time water level of the city's basic blocks.

[0034] Determining water levels during droughts is difficult, mainly because water levels are below the surface and there is no standard for judgment. Here, a moisture threshold is used to determine water levels. The moisture threshold is the moisture content in soil with sufficient moisture. Therefore, the real-time water level of urban blocks during droughts can be determined using the moisture threshold.

[0035] Furthermore, this solution also proposes a storage medium on which a computer-readable program is stored. When the computer-readable program is invoked, the aforementioned multi-node collaborative control method for urban drainage systems based on multi-objective optimization is executed.

[0036] It is understandable that the storage medium can be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; an optical medium, such as a DVD; or a semiconductor medium, such as a solid-state drive (SSD).

[0037] In summary, the advantages of this invention are as follows: By obtaining the water loss coefficient of the basic urban blocks, the upper and lower limits of the water level of the basic urban blocks, the daily water level change of the basic urban blocks, and the drainage and drought resistance sets of the basic urban blocks, the different water loss situations caused by soil height can be analyzed. This allows for the understanding of the impact of weather on the daily water level change of the basic urban blocks. Furthermore, based on the different types of green vegetation in the basic urban blocks, the limits of drought or flood resistance of the basic urban blocks can be analyzed. Therefore, a management plan for the urban drainage system can be derived by considering all these factors. Because it takes into account various planting factors in each city, the selected plan can largely meet the needs of drought resistance and drainage. Since the green vegetation covers the entire city, its drainage needs are similar to those of the city. Therefore, meeting the drainage control needs of the green vegetation can also meet the city's drainage needs. Thus, the urban drainage system can be controlled from multiple perspectives.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A multi-node collaborative control method for urban drainage systems based on multi-objective optimization, characterized in that, include: Obtain at least one city block, obtain the green vegetation within the city block, and obtain the location and surface elevation of the city block. The soil and height of the urban basic blocks were analyzed to obtain the water loss coefficient of the urban basic blocks; Based on the green vegetation in the basic urban blocks, the upper and lower limits of the water level in the basic urban blocks are analyzed and obtained. Obtain at least one water storage site, which can be a reservoir, dam, lake, or pond, and obtain the real-time water level of the water storage site; Based on the connection relationship between the water storage plots and the basic urban blocks, the first set of water storage plots and the second set of water storage plots are formed respectively. Gates are installed on the pipelines connecting the water storage plots and the basic urban blocks. Based on weather forecasts and water loss coefficients, the daily water level changes in the city's basic blocks were analyzed. Based on the water level change, determine the management attribute of the basic urban area, which is either flood drainage or drought resistance. When the management attribute of the basic urban block is drainage, the drainage set of the basic urban block is formed according to the first water storage block set; When the management attribute of the basic urban block is drought resistance, a drought resistance set of the basic urban block is formed based on the set of the second water storage blocks; According to the formed drainage or drought relief system, the gates of the pipelines connecting the water storage area and the basic urban area are controlled.

2. The multi-node collaborative control method for urban drainage systems based on multi-objective optimization according to claim 1, characterized in that, The process of obtaining at least one city basic block includes the following steps: The city is evenly divided into at least one urban local block. The surface height and planted green vegetation of the urban local block are counted. Adjacent urban local blocks with the same surface height and the same green vegetation are merged to obtain at least one urban basic block.

3. The multi-node collaborative control method for urban drainage systems based on multi-objective optimization according to claim 2, characterized in that, The analysis of the soil and height of the urban basic block to obtain the water loss coefficient of the urban basic block includes the following steps: Soil samples are taken from the basic urban blocks to obtain sampling blocks. Each sampling block is a cube with a top area of ​​a unit area. The first moisture content of the sampling block at the current moment is obtained, and the second moisture content of the sampling block after a preset time is obtained. The preset time is set based on experience, and the units of the first and second moisture contents are percentages. The difference between the first moisture content and the second moisture content is multiplied by the volume of the sampling block and then divided by the preset time to obtain the moisture loss rate of the urban basic block. The maximum surface elevation of the basic urban blocks is taken as the first elevation, and the minimum surface elevation of the basic urban blocks is taken as the second elevation. The difference between the first and second elevations is used to obtain the reference elevation. The difference between the surface elevation of the urban basic block and the second elevation is used to obtain the effective elevation of the urban basic block. The effective elevation of the urban basic block is divided by the reference elevation to obtain the effective coefficient of the urban basic block. The effective coefficient of a city's basic block is obtained by multiplying the water loss rate of the city's basic block by the water loss rate of the city's basic block.

4. The multi-node collaborative control method for urban drainage systems based on multi-objective optimization according to claim 3, characterized in that, The process of analyzing the upper and lower limits of water levels in urban basic blocks based on green vegetation includes the following steps: Obtain at least one historical planting record of the green vegetation, and use historical planting records of normal growth of the green vegetation as reference planting records; The upper limit of the historical water level of the urban basic block in the planting situation will be used as the upper limit of the water level of the urban basic block; The lower limit of the historical water level of the urban basic block in the reference planting situation will be used as the lower limit of the water level of the urban basic block.

5. The multi-node collaborative control method for urban drainage systems based on multi-objective optimization according to claim 4, characterized in that, The first and second sets of water-retaining land parcels, which respectively form the basic urban blocks, include the following steps: The water storage plots whose real-time water level is lower than the lower limit of the water level of the basic urban area are aggregated to form the first water storage plot set of the basic urban area. The water storage plots whose real-time water level is higher than the upper limit of the water level of the basic urban area are aggregated to form the second set of water storage plots of the basic urban area.

6. The multi-node collaborative control method for urban drainage systems based on multi-objective optimization according to claim 5, characterized in that, The process of analyzing the daily water level change of a city's basic blocks based on weather forecasts and water loss coefficients includes the following steps: Obtain the temperature range of the environment, divide the temperature range of the environment into equal intervals, and obtain at least one identification point; Under the condition that the ambient temperature is equal to the value at the identification point, the amount of water evaporation per unit area of ​​land is obtained. The identification point is paired with the amount of water evaporation per unit area of ​​land and fitted to obtain the evaporation fitting function. Based on the weather forecast, obtain the rainfall and actual temperature for the day. The rainfall is the cumulative depth of the rainfall that day. Substitute the actual temperature of the day into the evaporation fitting function to obtain the actual evaporation. Multiply the actual evaporation by the area of ​​the city's basic block to obtain the total evaporation. The total water loss is obtained by multiplying the water loss coefficient of the basic urban area by the area of ​​the basic urban area. Rainfall is multiplied by the area of ​​the basic urban block to obtain the rainwater volume, and the rainwater volume is multiplied by the water loss coefficient to obtain the retained rainwater volume. Subtracting the total evaporation and total loss from the retained rainfall yields the effective rainfall. Dividing the effective rainfall by the area of ​​the urban basic block yields the daily water level change of the urban basic block.

7. The multi-node collaborative control method for urban drainage systems based on multi-objective optimization according to claim 6, characterized in that, Determining the management attributes of urban basic blocks based on water level changes includes the following steps: The predicted water level of the city's basic blocks is obtained by superimposing the initial water level and the water level change of the basic blocks on the same day. If the predicted water level of a basic urban area is greater than the upper limit of the water level of the basic urban area, then the management attribute of the basic urban area is flood drainage. If the predicted water level of a city's basic block is lower than the lower limit of the water level of the city's basic block, then the management attribute of the city's basic block is drought resistance.

8. The multi-node collaborative control method for urban drainage systems based on multi-objective optimization according to claim 7, characterized in that, The process of forming a drainage system for the basic urban blocks based on the first set of water storage sites includes the following steps: The average water level of the basic urban area is obtained by taking the average of the upper and lower limits of the water level. Subtracting the average water level of the basic urban area from the predicted water level of the basic urban area yields the required drainage water level of the basic urban area. Multiplying the required drainage water level of the basic urban area by the area of ​​the basic urban area yields the required drainage volume of the basic urban area. The average of the predicted water levels for the basic urban blocks is used to obtain the reference water level; The difference between the reference water level and the real-time water level of the water storage area is multiplied by the area of ​​the water storage area to obtain the drainage capacity of the water storage area. Form at least one drainage scheme, which satisfies that a subset of the first water storage plot set of the urban basic block is used as the first preliminary set of the urban basic block in the drainage scheme; Take the union of the first preliminary set of urban basic blocks in the drainage plan to obtain the first total set. Add up the drainage capacity of the water storage blocks in the first total set to obtain the total drainage capacity. The total amount of water that should be drained from all the basic urban blocks is summed up to obtain the total amount of water that should be drained. Select one of the drainage schemes where the total drainage volume is less than the total drainage capacity as the target drainage scheme, and use the first preliminary set of urban basic blocks in the target drainage scheme as the drainage set of urban basic blocks.

9. The multi-node collaborative control method for urban drainage systems based on multi-objective optimization according to claim 8, characterized in that, The process of forming a drought-resistant set for the basic urban blocks based on the second set of water storage plots includes the following steps: A water threshold is formed by subtracting the predicted water level of the urban basic block from the average water level of the urban basic block to obtain the drought-resistant water level of the urban basic block. The drought-resistant water level of the urban basic block, the area of ​​the urban basic block, and the water threshold are multiplied together to obtain the drought-resistant water volume of the urban basic block. The drought resistance capacity of the water storage plot is obtained by multiplying the difference between the real-time water level and the reference water level by the area of ​​the water storage plot. Form at least one drought relief scheme, which satisfies that a subset of the second water storage plot set of the urban basic block is used as the second preliminary set of the urban basic block in the drought relief scheme; The drought relief length is obtained by summing the pipeline lengths between the basic urban blocks and the water storage plots in the second reserve set of the basic urban blocks. The drought relief lengths in the drought relief schemes are summed to obtain the comprehensive drought relief length. The second preliminary set of urban basic blocks in the drought relief plan is combined to obtain the second total set. The drought relief capacity of the water storage blocks in the second total set is added together to obtain the total drought relief capacity. The total amount of drought-resistant water required for all basic urban blocks is obtained by summing up the drought-resistant water requirements. Select the drought relief plan with a total drought relief capacity greater than the total amount of drought relief required as the reserve drought relief plan, select the reserve drought relief plan with the smallest comprehensive drought relief length as the target drought relief plan, and select the second reserve set of urban basic blocks in the target drought relief plan as the drought relief set of urban basic blocks. The specific threshold for moisture formation is as follows: At least one sampling point is uniformly taken below the surface of the basic urban block. If the difference in historical moisture content measured in spring, summer, autumn and winter does not exceed the allowable measurement error, the sampling point is taken as the target sampling point. The target moisture content is obtained by averaging the historical moisture content measured at the target sampling points in spring, summer, autumn and winter. The minimum value of the target moisture content at at least one target sampling point is used as the moisture threshold.

10. The multi-node collaborative control method for urban drainage systems based on multi-objective optimization according to claim 9, characterized in that, Controlling the gates of the pipeline connecting the water storage plot and the urban infrastructure includes the following steps: When the management attribute of the urban basic block is drainage, if the real-time water level of the urban basic block exceeds the upper limit of the urban basic block's water level, the gate of the pipeline connecting the water storage plot in the drainage set to the urban basic block will be opened until the real-time water level of the urban basic block is equal to the average water level of the urban basic block, and then the gate will be closed. When the management attribute of the urban basic block is drought resistance, if the real-time water level of the urban basic block is lower than the lower limit of the water level of the urban basic block, the gate of the pipeline connecting the water storage plot in the drought resistance set to the urban basic block will be opened until the real-time water level of the urban basic block is equal to the average water level of the urban basic block, and then the gate will be closed. The real-time water level of the city's basic blocks is obtained as follows: If the surface of a city block is covered by water, the water level of the city block will be used as the real-time water level of the city block. If the surface of the basic urban block is not covered by water, the real-time moisture content at the sampling point is measured. If the real-time moisture content at the sampling point is greater than the moisture threshold, the sampling point is used as a feature sampling point. The maximum height of the feature sampling points is used as the real-time water level of the city's basic blocks.

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