A method, system, storage medium and electronic device for calculating water environment capacity

Abstract

The present invention provides a method, system, storage medium and electronic device for calculating water environment capacity, the method comprising the following steps: dividing and calculating river sections according to water function zones and control section positions; obtaining the calculation boundary of the calculated river sections according to the water quality targets and control requirements of each of the calculated river sections; determining the water environment capacity calculation method and corresponding calculation parameters of each of the calculated river sections based on the calculation boundary and the river characteristics of the calculated river sections; obtaining the water environment capacity of each of the calculated river sections based on the calculation method and calculation parameters. The water environment capacity calculation method, system, storage medium and electronic device of the present invention simultaneously meet the water function zone management requirements and the control section water quality assessment requirements, realize the change analysis of water environment capacity at different periods and different guarantee rates for different types of projects, and provide technical support for regional total pollution control.

Description

Technical Field

[0001] The present invention belongs to the technical field of ecological environmental protection, and in particular relates to a water environment capacity calculation method, system, storage medium and electronic equipment. Background Art

[0002] Water environment capacity refers to the maximum allowable pollution absorption capacity of a water body under the premise of meeting water quality standards. This concept includes at least four aspects: the abundance of water environment capacity should meet the quality requirements of human life and production; the pollution absorption capacity of water bodies for certain pollutants; meet the sustainable development of social economy; maintain the self-purification capacity of water bodies and the integrity of water ecosystems. Water environment capacity is mainly composed of dilution capacity and self-purification capacity, among which dilution capacity relies on dilution to achieve water quality goals, and self-purification achieves self-purification of pollutants through physical, chemical and biological effects.

[0003] In the field of water environment governance, water environment capacity analysis and water pollution source tracing are the key foundations for scientifically formulating governance plans. At present, the assessment requirements for water environment quality mainly include the compliance requirements for control sections and water functional areas. When calculating water environment capacity, usually only one of the dilution capacity or self-purification capacity is considered to achieve total pollutant control. However, the existing technology has the following shortcomings: At present, water environment capacity calculation mostly only considers one of the dilution capacity or self-purification capacity, resulting in the calculated water environment capacity being unable to effectively connect with the water environment management objectives. The traditional static water environment capacity calculation method ignores the dynamic changes of parameters such as hydrological conditions, production and discharge of pollutants, and self-purification capacity, which makes the calculation results limited in practical applications. The traditional water environment capacity calculation method is more suitable for water environment governance dominated by point source pollution, but has defects in non-point source pollution governance. This easily leads to problems of excess purification capacity or substandard water quality. The existing water environment quality assessment requirements only include the compliance requirements for control sections and water functional areas, and do not fully consider factors such as water environment capacity abundance and social and economic sustainable development.

[0004] Therefore, how to provide a water environment capacity calculation method to solve the above problems has become an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide a water environment capacity calculation method, system, storage medium and electronic device to solve the technical problems of the current water environment capacity calculation method being single, ignoring dynamic changes, having a limited scope of application, and incomplete water environment quality assessment. It can simultaneously meet the water functional area management requirements and the control section water quality assessment requirements, and realize the change analysis of water environment capacity at different periods and different guarantee rates for different types of projects, providing technical support for regional total pollution control.

[0006] In a first aspect, the present invention provides a method for calculating water environment capacity, the method comprising the following steps: dividing and calculating a river section according to water function sections and control section locations;

[0007] According to the water quality objectives and control requirements of each calculated river section, the calculation boundary of the calculated river section is obtained;

[0008] Determine the water environment capacity calculation method and corresponding calculation parameters of each calculated river section based on the calculation boundary;

[0009] Based on the calculation method and calculation parameters, the water environment capacity of each calculated river section is obtained.

[0010] In an implementation of the first aspect, the water environment capacity calculation method includes a method for calculating the overall water environment capacity of a water functional area and a method for calculating the water environment capacity of a control section based on the calculation boundary.

[0011] In an implementation of the first aspect, the water environment capacity calculation method includes a zero-dimensional model method, a one-dimensional model method, a two-dimensional model method, a model trial and error method, a linear programming method, a random programming method, a probability dilution model method, a gray system theory method, and a blind number theory method.

[0012] In an implementation of the first aspect, the capacity calculation scale, the hydrological guarantee rate, and the degradation coefficient.

[0013] In an implementation of the first aspect, based on the calculation method and the calculation parameters, obtaining the water environment capacity of each calculated river section includes the following steps:

[0014] Based on the calculation method and calculation parameters, the overall water environment capacity of the water function zone of each calculated river section and the water environment capacity of the control section that meets the standards are obtained;

[0015] The overall water environment capacity of the water functional zone of each calculated river section and the water environment capacity of the control section that meets the standards are compared, and the smaller value is obtained as the water environment capacity of the calculated river section.

[0016] In an implementation of the first aspect, after obtaining a smaller value as the water environment capacity of the calculated river section, spatial and temporal statistical accumulation is performed according to the target river channel and administrative area to obtain the total water environment capacity of the river channel and administrative area, using the following formula:

[0017]

[0018] Among them, the M ij It represents the water environment capacity of the ith river section in the jth time period, m represents the number of river sections, and n represents the number of days in the calculation period.

[0019] In an implementation of the first aspect, after obtaining the smaller value as the water environment capacity of the calculated river section, it also includes optimizing the allocation of the water environment capacity of each calculated river section by using an optimization algorithm based on the optimization target and constraints.

[0020] In a second aspect, the present invention provides a water environment capacity calculation system, the system comprising a river section division module, a boundary acquisition module, a method setting module and a capacity calculation module;

[0021] The river section division module is used to divide and calculate the river section according to the water function section and the control section position;

[0022] The boundary acquisition module is used to obtain the calculation boundary of the calculated river section according to the water quality target and control requirements of each calculated river section;

[0023] The method setting module is used to determine the water environment capacity calculation method and corresponding calculation parameters of each calculated river section based on the calculation boundary;

[0024] The capacity calculation module is used to obtain the water environment capacity of each calculated river section based on the calculation method and calculation parameters.

[0025] In a third aspect, the present invention provides an electronic device, the electronic device comprising: a processor and a memory;

[0026] The memory is used to store computer programs;

[0027] The processor is used to execute the computer program stored in the memory so that the electronic device executes the above-mentioned water environment capacity calculation method.

[0028] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which implements the above-mentioned water environment capacity calculation method when executed by an electronic device.

[0029] As described above, the water environment capacity calculation method, system, storage medium and electronic device of the present invention have the following features:

[0030] Beneficial effects:

[0031] The water environment capacity calculation method, system, storage medium and electronic device described in the present invention provide a dual-standard calculation method that can simultaneously meet the water function zone management requirements and the control section water quality assessment requirements: Water function zoning is to divide the river into different functional areas according to the natural attributes, social functions and economic needs of the river, and set specific water quality goals and protection requirements for each area. The method of the present invention can ensure that the water quality in the water function zone reaches the set water quality target and meets the management requirements of the water function zone. The control section refers to a water quality monitoring point at a specific location in the river, which is used to evaluate the water quality status of the river. The method of the present invention can ensure that the water quality of the control section meets the assessment requirements and meets specific water quality management goals.

[0032] The water environment capacity calculation method, system, storage medium and electronic device described in the present invention provide a dynamic water environment capacity calculation method: the method of the present invention can perform dynamic water environment capacity calculation according to the water quality changes of the river in different time periods. For example, the corresponding water environment capacity calculation can be performed according to the water quality changes of the river in different seasons and different climatic conditions. In addition, the method of the present invention can perform corresponding water environment capacity calculation according to the water quality changes of the river under different guarantee rates. For example, the corresponding water environment capacity calculation can be performed according to the water quality changes of the river under a 90% guarantee rate.

[0033] The water environment capacity calculation method, system, storage medium and electronic device described in the present invention provide technical support for the analysis of changes in water environment capacity: through the method of the present invention, the water environment capacity of the river can be accurately calculated to provide a scientific basis for the total regional pollution control. For example, corresponding pollution control measures can be formulated according to the water environment capacity of the river to ensure that the water quality of the river meets the requirements of environmental protection. The method of the present invention can provide technical support for the analysis of changes in water environment capacity of different types of projects at different times and different guarantee rates. For example, it can provide decision-making support for urban planning, industrial layout, ecological protection, etc., to ensure that the impact of the project on river water quality is within a controllable range.

[0034] In summary, the present invention provides a dynamic water environment capacity calculation method based on double standards suitable for rivers. The method can simultaneously meet the management requirements of water functional areas and the water quality assessment requirements of control sections, and provide technical support for the analysis of changes in water environment capacity of different types of projects at different periods and different guarantee rates, thereby providing a scientific basis for regional total pollution control. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Shown is a flow chart of a method for calculating water environment capacity in one embodiment of the present invention;

[0036] Figure 2Shown is a schematic diagram of a river section division method in an embodiment of a water environment capacity calculation method of the present invention;

[0037] Figure 3 Shown is a flow chart of steps in a method for calculating water environment capacity according to an embodiment of the present invention;

[0038] Figure 4 Shown is a schematic diagram of the structure of a water environment capacity calculation system in one embodiment of the present invention;

[0039] Figure 5 It is a schematic structural diagram of an electronic device of the present invention in one embodiment. DETAILED DESCRIPTION

[0040] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0041] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0042] The technical solutions in the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0043] like Figure 1 As shown, in one embodiment, the water environment capacity calculation method of the present invention includes steps S11 to S14.

[0044] Step S11, dividing and calculating the river section according to the water function section and the control section position.

[0045] Specifically, the core of this step is to divide the river into multiple calculation sections, so as to carry out specific water environment capacity calculation for different sections. The division principle takes into account the location of the control section, the water function section and the flow direction of the river, ensuring the pertinence and accuracy of the calculation. Figure 2 As shown in the figure, the principles for calculating river section division are as follows:

[0046] (1) For river sections with only control sections: This refers to the presence of specific control sections in the river for monitoring and assessing water quality, but no clear water function zoning. The control section is used as the downstream boundary, and the section from the previous section with assessment requirements or the upstream boundary of the calculated river section to the control section is a calculated river section. For details, see Figure 2 Calculate the river section A in this way. This can ensure that the water quality before the control section can meet the assessment requirements, and also provide a clear scope for the water quality management of this section.

[0047] (2) For river sections with control sections located in the middle of water function zones: This refers to the situation where the river is divided into water function zones and has control sections, and the control sections are located in the middle of the water function zones. The water function zone is divided into two sections, the upper and lower sections, with the section from the last section with assessment requirements or the upstream boundary of the calculated river channel to the control section as one calculated river section. Figure 2 The section from this control section to the downstream boundary of the water function zone is another section for calculation. Figure 2 This division can evaluate the water quality conditions of the upstream and downstream water functional areas separately, while ensuring that the water quality of the control section meets the standards.

[0048] (3) For river sections with only water function zones: This refers to the situation where the river is divided into water function zones but no control sections are set. The entire water function zone is regarded as one calculation river section. Figure 2 This allows the pollution load to be assessed for the entire water function zone, ensuring that the water quality objectives for the water function zone are met.

[0049] Through such a division, it can be ensured that each calculated river section has clear water quality targets and pollution control requirements, which is convenient for the subsequent water environment capacity calculation. The division of each river section is based on its specific water quality management needs and assessment standards, making the water environment capacity calculation more accurate and practical. In addition, this division method also takes into account the actual flow direction and water quality conditions of the river, which helps to implement more effective pollution control and water quality improvement measures.

[0050] Step S12: acquiring the calculation boundary of the calculated river section according to the water quality target and control requirements of each calculated river section.

[0051] The calculation boundary is mainly based on the water quality target requirements of the water functional zone, and the upper limit value of the corresponding environmental quality standard category is taken as the water quality target of the lower boundary of each calculation unit. The water quality target of the river section in the non-water functional zone refers to the water quality target requirements of the functional zoning that eventually flows into the water area. The water quality target and section assessment target of the non-boundary water functional zone are considered as water quality restriction targets.

[0052] Specifically, the calculation boundary refers to the water quality target value set for each calculation unit (such as a river section) when calculating the water environment capacity. This target value will serve as a benchmark for assessing the water environment capacity to ensure that the calculation results can meet the predetermined water quality protection requirements.

[0053] (1) Main basis for determining the calculation boundary

[0054] 1) Water quality target requirements for water functional areas:

[0055] For river sections within a water function zone, the calculation boundary is usually determined based on the water quality targets set for the water function zone. Water quality targets are usually set by environmental protection departments or water resources management departments and reflect the basic requirements for water quality in a specific water function zone.

[0056] 2) Upper limit of environmental quality standard category

[0057] When determining the calculation boundary, the upper limit of the corresponding environmental quality standard category is usually taken as the water quality target. This is because the water environment capacity calculation is to ensure that the water quality does not exceed these standards, so the upper limit represents the maximum pollution load that the water environment can withstand.

[0058] (2) Specific setting of calculation boundary

[0059] Calculation boundary of water function zone: For river sections in water function zones, the calculation boundary is the upper limit of the water quality target for that function zone. For example, if the water quality target for a function zone is Class II water, then the calculation boundary is the upper limit of the water quality standard for Class II water.

[0060] Calculation boundary of non-water functional zone: For river sections in non-water functional zones, their water quality targets refer to the water quality target requirements of the functional zoning of the water area they eventually flow into. This means that even if a river section does not belong to a specific water functional zone, its water quality target should be consistent with the water quality target of the water functional zone it eventually flows into.

[0061] Water quality targets and cross-section assessment targets for non-boundary water functional areas: For non-boundary water functional areas, that is, those water functional areas that are not directly connected to external water bodies, their water quality targets and cross-section assessment targets are also considered as water quality restriction targets. This is because although these areas are not directly connected to external water bodies, their water quality conditions still have an important impact on the water quality of the entire water system.

[0062] In actual operation, determining the calculation boundary requires collecting relevant environmental quality standards, water function zoning, and river water quality monitoring data. The specific conditions of different river sections need to be considered, such as the distribution of pollution sources, the self-purification capacity of the river, and hydrological conditions, to ensure that the calculation boundary meets both regulatory requirements and actual conditions. After determining the calculation boundary, the water environment capacity of each river section can be calculated based on these boundary values, and then the water environment capacity of the entire water system can be evaluated. Through the above steps, it can be ensured that the results of the water environment capacity calculation are both scientific and reasonable, and can meet the actual needs of water environment management.

[0063] by Figure 2 For example, assuming that there is no water quality control requirement upstream of river section A, the water quality target of control section I is Class II, the water quality target of water functional area 1 is Class III, the water quality target of control section II is Class III, and the water quality target of water functional area 2 is Class IV. Taking the pollutant COD as an example, according to the above principles, the calculation boundary of the upstream water quality of river section A is determined to be 20 mg / L (Class III), the calculation boundary of the upstream water quality of river section B is 20 mg / L (Class III), the calculation boundary of the upstream water quality of river section C is 20 mg / L (Class III), and the calculation boundary of the upstream water quality of river section D is 20 mg / L (Class III).

[0064] Step S13: determining the water environment capacity calculation method and corresponding calculation parameters of each calculated river section based on the calculation boundary.

[0065] Specifically, a suitable method for calculating water environment capacity is selected according to the characteristics of the river. As shown in Table 1, the methods for calculating water environment capacity include formula method: zero-dimensional model method, one-dimensional model method, two-dimensional model method; model trial and error method; system planning method: linear programming method, random programming method; probability dilution model method; uncertain mathematical method: grey system theory method, blind number theory method.

[0066] (1) Zero-dimensional model method

[0067] When the following conditions are met: the river section is a small river section with uniform pollutant mixing (Q≤15m 3 / s); the ratio of river water flow to sewage flow is greater than 10-20; shallower and narrower rivers where the mixing distance of sewage into the water body does not need to be considered.

[0068] 1) Assume that pollutants enter the river section from the upstream section of the calculated river section, and only consider the dilution effect of water volume. Use the following formula:

[0069] M=(C S -C0)(Q+Q p )

[0070] Where M is the pollution holding capacity of the water area, g / s; C sis the target water quality concentration value, mg / L; C0 is the water quality pollutant concentration value of the initial section, mg / L; Q is the inflow flow of the initial section, m 3 / s;;Q p is the amount of wastewater discharged, m 3 / s.

[0071] 2) Assuming that pollutants enter the water body from the calculated river section, only the dilution effect is considered. The following formula is used:

[0072] M=C S (Q+Q p )-C0Q

[0073] Where M is the pollution holding capacity of the water area, g / s; C s is the target water quality concentration value, mg / L; C0 is the water quality pollutant concentration value of the initial section, mg / L; Q is the inflow flow of the initial section, m 3 / s;Q p is the amount of wastewater discharged, m 3 / s.

[0074] 3) Assuming that pollutants enter the water body from the calculated river section, dilution and self-purification are considered. The following formula is used:

[0075] M=C S (Q+Q p )-C0Q+KVC S

[0076] Where M is the pollution holding capacity of the water area, g / s; C s is the target water quality concentration value, mg / L; C0 is the water quality pollutant concentration value of the initial section, mg / L; Q is the inflow flow of the initial section, m 3 / s;Q p is the amount of wastewater discharged, m 3 / s; K is the comprehensive degradation coefficient of pollutants, 1 / s; V is the volume of the water body in the calculated area, m 3 .

[0077] The advantages of the zero-dimensional model method are that the formula is simple and the calculation parameters are few. It is suitable for areas with many rivers and complex water systems. It is suitable for the overall compliance of water function areas, but not for cross-section compliance.

[0078] (2) One-dimensional model method

[0079] When the following conditions are met: small and medium-sized river sections (Q<150m 3 / s); wide and shallow river sections; pollutants can be basically mixed evenly in a relatively short period of time.

[0080] 1) Without considering the location and discharge method of the existing sewage outlet, the following formula is used:

[0081]

[0082] Where, L is the longitudinal distance along the river section, m; u is the average flow velocity of the river section under the design flow, m / s; the meanings of other symbols are the same as in the above formula.

[0083] 2) Consider the location and discharge method of the existing sewage outlets, and do not consider the impact of the existing pollutants entering the river. Use the following formula

[0084]

[0085] Where x is the distance from the sewage outlet to the lower section of the calculated river section, m; the meanings of other symbols are the same as in the above formula.

[0086] 3) Considering the impact of the existing pollutant inflow into the river, only water dilution is considered for the remaining capacity, and pollutant degradation is not considered. The following formula is used:

[0087]

[0088] Where a is the rate of pollutants entering the river, g / s; the meanings of other symbols are the same as in the above formula.

[0089] The one-dimensional model method takes into account the changes in pollutants in the longitudinal direction of the river, requires fewer calculation parameters, and can be used for the overall compliance of water functional areas and the compliance of control sections. It is widely used in management practice, but different outlet generalization methods will lead to large differences in calculation results.

[0090] (3) Two-dimensional model method

[0091] When the following conditions are met: large river sections (Q ≥ 150m 3 / s); pollutants are discharged continuously and steadily; the cross section of the river is rectangular; because the model is strictly controlled, it is suitable for calculating the pollution absorption capacity of river sections in drinking water sources.

[0092] 1) Considering the impact of the existing pollutant inflow into the river, only water dilution is considered for the remaining capacity, and pollutant degradation is not considered. The following formula is used:

[0093]

[0094] Where h is the average water depth of the calculated water area, m; Ey is the lateral diffusion coefficient of the pollutant, m 2 / s; y is the lateral distance from the calculation point to the shore, m; the meanings of other symbols are the same as in the above formula.

[0095] 2) Consider the location and discharge method of the existing sewage outlets, and do not consider the impact of the existing pollutant discharge into the river. Use the following formula:

[0096]

[0097] The symbols have the same meaning as in the above formula.

[0098] The two-dimensional model method takes into account both the changes in pollutants in the longitudinal direction of the river and the changes in the lateral direction of the river. It is suitable for situations where the water quality of the control section meets the standards, but the calculation formula is relatively complicated and is rarely used in practice.

[0099] (4) Model trial and error method

[0100] When applied to the calculation of a single river channel or other water bodies with relatively simple calculation conditions. The river can be divided into different sections. A large amount of pollutants are added to the upper section of the first section to make the water quality there reach the upper limit of the water quality standard. The amount of pollutants added is the environmental capacity of this river section. Due to the flow and degradation of river water, when pollutants flow to the next control section, the concentration of pollutants is reduced. When it is lower than the water quality standard, a certain amount of pollutants can be added to the water without exceeding the water quality standard. The amount of this part of pollutants can be considered as the water environmental capacity of the second river section. By analogy, the sum of the capacity of each river section is the total environmental capacity.

[0101] The model trial and error method adds pollution sources to the calculated river section and pays attention to whether the water quality of the control section and the water function area exceeds the limit. After repeated trials and multiple iterations, the calculated water quality is close to the water quality limit of the control section and the water function area. The total amount of pollution sources input is the water environment capacity of the river section. The calculation accuracy is relatively high; it can be applied to both the control section and the overall standard. However, the calculation efficiency is low, and the calculation results are greatly affected by the setting method of the outlet location.

[0102] (5) System Planning Method

[0103] The system planning method has a wide range of applications and can be applied to different water bodies such as non-tidal rivers, lakes and reservoirs as well as tidal river networks and estuaries.

[0104] 1) The linear programming method uses the following formula:

[0105] Objective function:

[0106] Constraints:

[0107] Where i is the water quality control point number; f is the number of water quality control points; j is the sewage outlet number; z is the number of sewage outlets; X is the pollution load; L X is the total pollution load; a ij is the pollution contribution coefficient of the unit load of the j-th sewage outlet to the i-th water quality control point; Cbi is the pollution background concentration at the water quality control point; is the water quality target at the ith control point.

[0108] 2) The stochastic programming method uses the following formula:

[0109] Objective function:

[0110] Constraints:

[0111] ξ j ~logz(X i ,u 2 )

[0112] X i ≥0

[0113] Among them, ξ j is the actual discharge volume of the sewage outlet; Pr{} represents the probability of the event occurring; a i is the requirement for water quality compliance rate; lpgz() represents the distribution law it obeys.

[0114] The system planning method has a wide range of applications, a high degree of automation, and high calculation efficiency.

[0115] (6) Probability Dilution Model Method

[0116] When the following conditions are met: it is applicable to the calculation of some difficult-to-degrade substances, and is used for the calculation of some small rivers or local sections of large rivers). The calculation idea adopted is:

[0117] 1) Based on certain basic assumptions, a probabilistic dilution model of downstream concentration after the pollutants are evenly mixed with the water body is established;

[0118] 2) Use the moment approximation method to solve the compliance rate of the control section under a certain control concentration;

[0119] 3) Use numerical integration to solve the water environment capacity of the water body under different control concentrations and different compliance rates in the control section.

[0120] The water environment capacity obtained by the probability dilution model method has a random fluctuation process, which is more in line with the actual situation of the water body; but it does not take into account the degradation process of pollutants; it does not take into account the situation of non-point source pollution; the calculation formula is relatively complicated and difficult to apply to the calculation of complex water bodies; and it requires a large amount of data.

[0121] (7) Uncertain Mathematics

[0122] 1) The calculation idea of ​​the grey system theory method is:

[0123] Using the current data, through grey correlation analysis and GM model, the arrangement of industrial wastewater volume, domestic sewage volume and total discharge of major pollutants in the basin area from history to the current situation is derived, and the model is debugged and verified.

[0124] The derivation model is used to predict the total discharge of industrial wastewater and domestic sewage and the total load of each pollutant in each year between the current year and the target year.

[0125] The water environment capacity is calculated based on the predicted data.

[0126] 2) The calculation idea of ​​the blind number theory method is: express the river flow, flow velocity, pollutant concentration, etc. in the form of blind numbers, and calculate the water environment capacity of the river according to the formula method. This water environment capacity is also expressed in the form of blind numbers.

[0127] The unascertained mathematical method fully considers the uncertainty of various parameters in the water environment system and is more in line with the actual situation of the water body. Compared with the probability model dilution method, the calculation process is simpler and it is suitable for situations where there is relatively little data.

[0128] In actual operation, the river characteristics are first analyzed, including river size, river shape, flow direction and flow rate. According to the flow size of the river, it is determined whether it is a small, medium or large river. For example, if the flow is less than 15m 3 / s can be regarded as a small river, suitable for the zero-dimensional model method. Wide and shallow river sections are suitable for the one-dimensional model method, while large river sections or river sections with non-uniform mixing of pollutants may require a two-dimensional model method. A river with a certain flow direction can choose a one-dimensional model method, and a river with complex flow velocity and flow direction may require a more complex model. Secondly, determine the management needs. If you are concerned about the water quality of a specific assessment section, you may need to use a one-dimensional or two-dimensional model method. If you are concerned about pollution control in the entire water function area, the system planning method or the zero-dimensional model method may be more appropriate. For ecologically sensitive areas, more sophisticated calculation methods may need to be considered, such as the two-dimensional model method or the probability dilution model method. Thirdly, consider technical feasibility. According to the type and quantity of data available, select an appropriate calculation method. For example, if the data is limited, you may need to use a model trial and error method or an undetermined mathematical method. Consider computing resources, such as the limitations of hardware and software tools, and select a calculation method that can be actually operated.

[0129] In one embodiment, based on the calculation boundary, a suitable water environment capacity calculation method is selected. For small rivers, a zero-dimensional model method is selected. For medium-sized rivers, a one-dimensional model method is selected. For large rivers, a two-dimensional model method is selected. For complex river systems, a system planning method or a probability dilution model method is considered. For cases with insufficient data, a model trial and error method or an undetermined mathematical method is considered. Through the above steps, the water environment capacity calculation method that is most suitable for a specific river can be determined to ensure that the calculation results are both scientific and practical and can meet the needs of water environment management and planning.

[0130] Specifically, the method for calculating the water environment capacity of each calculated river section based on the calculation boundary includes a method for calculating the overall water environment capacity of the water functional area based on the calculation boundary and a method for calculating the water environment capacity of the control section that meets the standards.

[0131] According to the definition of water environment capacity, the maximum amount of pollutants that a water body can accommodate under given hydrological conditions, provided that the specified water environment objectives are met, is the water environment capacity. In one embodiment, the calculation method for determining the overall water environment capacity of a water functional area based on the calculation boundary adopts the following formula:

[0132] M L =C SL (Q L +Q pL )-C 0L Q L +K L V L C SL

[0133] Among them, M L represents the water environment capacity of the calculated river section L, Q L represents the inflow flow of the inlet section of the calculated river section L, C 0L It represents the water quality concentration of the inlet section of the calculated river section L, Q pL represents the side inflow flow of the calculated river section L based on the current outflow volume, C SL represents the concentration of the water body in the river section L under the corresponding water quality standard, V L To calculate the volume of water in the water body, K L Represents the water quality degradation coefficient of the calculated river section L.

[0134] The core of the definition of the water environment capacity of a section is that the maximum amount of pollutants that a water body can accommodate under given hydrological conditions while meeting the water quality targets of a specific assessment section is the water environment capacity. The calculation methods include the formula method and the model trial method. For typical river network areas, the flow direction and velocity of the river are uncertain throughout the year, and the water environment model trial method should be used. For rivers with a certain flow direction, the one-dimensional or two-dimensional water environment capacity calculation formula in Table 1 can be selected.

[0135] Furthermore, the water environment capacity calculation method and corresponding calculation parameters of each calculated river section are determined based on the calculation boundary. The calculation parameters include: capacity calculation scale, hydrological guarantee rate, and degradation coefficient.

[0136] The calculation method is the framework and guiding principle of the entire water environment capacity calculation process. Different calculation methods may require different parameters and input data. For example, one-dimensional models and two-dimensional models have different parameter requirements, so you need to first determine which model to use in order to know which specific parameters are needed. Once the calculation method is determined, the required calculation parameters can be determined based on the specific requirements of the method. These parameters should match the selected method to ensure the accuracy of the calculation results. After the calculation method is determined, the required parameters can be collected and verified in a more targeted manner. The choice of calculation method will affect the type and amount of computing resources required. Determining the method first can help plan computing resources, such as hardware equipment, software tools, and data acquisition.

[0137] Select the appropriate calculation method based on the river's characteristics (such as size, flow direction, pollution status, etc.), management requirements (such as cross-section compliance, overall compliance, etc.) and technical feasibility (such as data availability, computing power, etc.). After the calculation method is determined, collect and determine the required parameters according to the requirements of the method, such as hydrological data, water quality data, pollutant characteristic parameters, degradation coefficients, etc.

[0138] The calculation parameters can reflect the specific hydrological, water quality and ecological conditions of a river or water body. Different rivers and water bodies have different characteristics, so it is necessary to select appropriate parameters according to the actual situation. Calculation parameters such as hydrological guarantee rate and degradation coefficient have a direct impact on the calculation results of water environment capacity. Accurate parameters can ensure that the calculation results are closer to the actual situation, thus providing a reliable basis for decision-making. Water environment management requires different management strategies for different goals (such as drinking water source protection, industrial water use, ecological protection, etc.). The determination of calculation parameters helps to meet the management needs of these specific goals. Water environment capacity may need to be evaluated on different time scales (such as years, months, days or hours). Determining the calculation parameters can ensure that the analysis on different time scales is appropriate. For example, determining the hydrological guarantee rate can ensure that when designing water environment capacity, extreme hydrological conditions with a certain probability, such as floods or droughts, are taken into account, thereby ensuring the safety of the water environment; the degradation coefficient reflects the natural attenuation rate of pollutants in the water body. Different pollutants, different water quality conditions and water temperature will affect the degradation coefficient. Accurate degradation coefficients are essential for predicting the behavior of pollutants in water bodies; choosing the right calculation scale (year, month, day) can ensure that the water environment capacity calculation can meet planning and management requirements. For example, short-term planning may require a finer time scale to assess the impact of pollution events; parameters such as flow, flow rate, water temperature and water quality concentration are the basic data for water environment capacity calculation. Determining these parameters helps to accurately simulate the transport and transformation of pollutants in water bodies.

[0139] In one embodiment, this step can be calculated in the medium- and long-term planning according to the design hydrological conditions of the driest month with a 90% guaranteed rate mentioned in the "Regulations for Calculating the Pollution Assimilating Capacity of Water Areas" as the calculation year type. The calculation scale is year or month. If it involves projects such as sewage plant outlet setting and combined system overflow pollution control, it is necessary to calculate the water environment capacity according to the most unfavorable conditions. The most unfavorable hydrological conditions include the driest situation and the maximum pollution load on rainy days. The water environment capacity time scale needs to be calculated to the day or hour. In order to determine the effect requirements of ecological engineering in different periods, ecological restoration projects need to consider the seasonal effect differences of ecological measures. Overall, the water environment capacity allocation is required for the whole year, quarter or month. The water environment capacity time scale needs to be calculated to the quarter or month, and the degradation coefficient on the time scale needs to be adjusted. The degradation coefficient can be obtained by actual measurement, experience reference, etc.

[0140] Step S14: Based on the calculation method and calculation parameters, the water environment capacity of each calculated river section is obtained.

[0141] Specifically, based on the calculation method and calculation parameters, obtaining the water environment capacity of each calculated river section includes the following steps:

[0142] Based on the calculation method and calculation parameters, the overall water environment capacity of the water function zone of each calculated river section and the water environment capacity of the control section that meets the standards are obtained;

[0143] When calculating the water environment capacity of a river, the overall water environment capacity of each calculated river section is compared with the water environment capacity of the cross section, and the smaller value is taken to ensure that the water quality of the river meets both the overall and local environmental protection requirements. The overall water environment capacity of the water function area of ​​each calculated river section and the water environment capacity of the control section are compared to obtain the smaller value as the water environment capacity of the calculated river section. The formula is as follows:

[0144] M 河段i =min(M 断面达标i , M 总体达标i )

[0145] Among them, M 河段i M is the water environment capacity that meets the overall standard and the water environment capacity that meets the standard of the section i. 断面达标i is the standard capacity of section i, M 总体达标i is the overall compliance capacity of river section i.

[0146] Further, after obtaining the smaller value as the water environment capacity of the calculated river section, the spatial and temporal statistical accumulation is performed according to the target river channel and administrative area to obtain the total water environment capacity of the river channel and administrative area, using the following formula:

[0147]

[0148] Among them, the M ij It represents the water environment capacity of the ith river section in the jth time period, m represents the number of river sections, and n represents the number of days in the calculation period.

[0149] The calculation in this step involves accumulating the water environmental capacity of the calculated river section in space and time to obtain the total water environmental capacity of the river and administrative area.

[0150] In one embodiment, the minimum spatial calculation unit is a river section, i.e., the section of the river between two nodes where the flow is relatively consistent. The minimum temporal calculation unit is a day, i.e., calculating the water environment capacity every day. The steps are as follows:

[0151] S141. Calculate the daily water environment capacity of a single river section

[0152] First, the water environmental capacity calculation formula for each river section is used to calculate the water environmental capacity value of each river section on each day. This value represents the maximum amount of pollutants that the river section can carry on a specific day without causing water quality standards to be violated.

[0153] S142, spatial accumulation

[0154] The water environment capacity value of each river section is spatially accumulated, that is, the water environment capacity values ​​of all river sections are summed up to obtain the water environment capacity of the entire river.

[0155] S143, Time Accumulation

[0156] The water environment capacity values ​​of each river section in all calculation periods (for example, each day) are accumulated over time to obtain the total water environment capacity of the river section during the calculation period.

[0157] In actual operation, for each river section, calculate its water environment capacity on each day. Add up the daily water environment capacity values ​​of all river sections to obtain the water environment capacity of the entire river channel on each day. Accumulate the water environment capacity values ​​of the river channel every day to obtain the water environment capacity of the river channel during the entire calculation period. If statistics are required by administrative district, add up the water environment capacity values ​​of all river sections belonging to the same administrative district. In this way, it can be ensured that the water environment capacity of the river channel and administrative district at different time scales is calculated, providing a scientific basis for water environment management and planning.

[0158] In one embodiment, when calculating the water environment capacity of a large river or a relatively simple water network area (including a small number of rivers and a certain river flow direction), for a river section that only has water function zone management requirements or control section assessment requirements, such as Figure 2 The water environment capacity of river section A when its control section meets the standard is calculated according to the one-dimensional or two-dimensional calculation formula in the formula method, and the water environment capacity of river section D when its overall standard is calculated according to the zero-dimensional calculation formula in the formula method; for river sections with dual assessment requirements, such as Figure 1 In calculating river section B, the smaller value is taken after calculating according to the two calculation formulas in the formula method, so as to meet both requirements at the same time. The water environment capacity calculation results of each calculated river section are accumulated to obtain the water environment capacity of the river or region that takes into account both overall compliance and cross-section compliance.

[0159] In one embodiment, when calculating the water environment capacity in a complex river network area, considering that there are many rivers and the river flow direction is uncertain, the zero-dimensional calculation formula in the formula method is generally used to calculate the water environment capacity of each river section when the overall standard is met, and the model trial and error method is used to analyze the water environment capacity when the control section meets the standard. The calculation results of the two methods for each river section are taken as the smaller value and then accumulated to obtain the water environment capacity of the river network area that takes into account both overall and cross-section compliance.

[0160] In one embodiment, if Figure 3As shown in the figure, a river is selected as the implementation object, and the river section is calculated according to the water function zoning and the location of the control section. The water quality targets of each control section and the water quality control requirements of the water function zone are clarified. According to the water quality targets and control requirements of each calculated river section, the calculation boundary is determined. Based on the calculation boundary, the calculation method of the overall water environment capacity of the water function zone and the calculation method of the water environment capacity of the section are determined respectively, and the calculation parameters are determined, including the capacity calculation scale, hydrological guarantee rate, degradation coefficient, etc. Calculate the water environment capacity of each calculated river section, compare the overall water environment capacity of each calculated river section and the water environment capacity of the section, take the smaller value of the two, and add them up according to the statistics of the river channel and administrative area to obtain the water environment capacity of the corresponding river channel and administrative area.

[0161] The protection scope of the water environment capacity calculation method described in the embodiment of the present invention is not limited to the execution order of the steps listed in this embodiment. All solutions implemented by adding, reducing or replacing steps in the prior art based on the principles of the present invention are included in the protection scope of the present invention.

[0162] An embodiment of the present invention also provides a water environment capacity calculation system, which can implement the water environment capacity calculation method described in the present invention. However, the implementation device of the water environment capacity calculation system described in the present invention includes but is not limited to the structure of the water environment capacity calculation system listed in this embodiment. All structural deformations and replacements of the prior art made according to the principles of the present invention are included in the protection scope of the present invention.

[0163] like Figure 4 As shown, in one embodiment, the water environment capacity calculation system of the present invention includes a river section division module 41, a boundary acquisition module 42, a method setting module 43 and a capacity calculation module 44.

[0164] The river section division module 41 is used to divide and calculate the river section according to the water function section and the control section position.

[0165] The boundary acquisition module 42 is connected to the river section division module 41, and is used to obtain the calculation boundary of the calculation river section according to the water quality target and control requirements of each calculation river section.

[0166] The method setting module 43 is connected to the boundary acquisition module 42 and is used to determine the water environment capacity calculation method and corresponding calculation parameters of each calculated river section based on the calculation boundary.

[0167] The capacity calculation module 44 is connected to the method setting module 43 and is used to obtain the water environment capacity of each calculated river section based on the calculation method and calculation parameters.

[0168] In the several embodiments provided by the present invention, it should be understood that the disclosed system, device or method can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules / units is only a logical function division, and there may be other division methods in actual implementation, such as multiple modules or units can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules or units, which can be electrical, mechanical or other forms.

[0169] The modules / units described as separate components may or may not be physically separated, and the components displayed as modules / units may or may not be physical modules, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules / units may be selected according to actual needs to achieve the purpose of the embodiments of the present invention. For example, the functional modules / units in the various embodiments of the present invention may be integrated into one processing module, or each module / unit may exist physically separately, or two or more modules / units may be integrated into one module / unit.

[0170] Those of ordinary skill in the art should further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0171] The embodiment of the present invention also provides a computer-readable storage medium. A person of ordinary skill in the art can understand that all or part of the steps in the method for implementing the above embodiment can be completed by instructing the processor through a program, and the program can be stored in a computer-readable storage medium, and the storage medium is a non-transitory medium, such as a random access memory, a read-only memory, a flash memory, a hard disk, a solid-state hard disk, a magnetic tape, a floppy disk, an optical disc, and any combination thereof. The above storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more available media. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a digital video disc (DVD)), or a semiconductor medium (e.g., a solid-state disk (SSD)), etc.

[0172] An embodiment of the present invention further provides an electronic device, which includes a processor and a memory.

[0173] The memory is used to store computer programs.

[0174] The memory includes: ROM, RAM, disk, USB flash drive, memory card or CD and other media that can store program codes.

[0175] The processor is connected to the memory and is used to execute the computer program stored in the memory so that the electronic device executes the above-mentioned water environment capacity calculation method.

[0176] Preferably, the processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.

[0177] like Figure 5As shown, the electronic device of the present invention is in the form of a general computing device. The components of the electronic device may include but are not limited to: one or more processors or processing units 51, a memory 52, and a bus 53 connecting different system components (including the memory 52 and the processing unit 51).

[0178] Bus 53 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor or a local bus using any of a variety of bus architectures. For example, these architectures include but are not limited to Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MAC) bus, Enhanced ISA bus, Video Electronics Standards Association (VESA) local bus and Peripheral Component Interconnect (PCI) bus.

[0179] Electronic devices typically include a variety of computer system readable media. These media can be any available media that can be accessed by the electronic device, including volatile and non-volatile media, removable and non-removable media.

[0180] The memory 52 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 521 and / or cache memory 522. The electronic device may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, the storage system 523 may be used to read and write non-removable, non-volatile magnetic media ( Figure 5 not shown, usually called a "hard drive"). Although Figure 5 Not shown, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk"), and an optical disk drive for reading and writing to a removable non-volatile optical disk (e.g., a CD-ROM, a DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to the bus 53 via one or more data medium interfaces. The memory 52 may include at least one program product having a set (e.g., at least one) of program modules that are configured to perform the functions of the various embodiments of the present invention.

[0181] A program / utility 524 having a set (at least one) of program modules 5241 may be stored, for example, in the memory 52, such program modules 5241 including but not limited to an operating system, one or more application programs, other program modules, and program data, each of which or some combination thereof may include an implementation of a network environment. The program modules 5241 generally perform the functions and / or methods of the embodiments described herein.

[0182] The electronic device may also communicate with one or more external devices (e.g., keyboards, pointing devices, displays, etc.), one or more devices that enable a user to interact with the electronic device, and / or any device that enables the electronic device to communicate with one or more other computing devices (e.g., network cards, modems, etc.). Such communication may be performed via input / output (I / O) interface 54. Furthermore, the electronic device may also communicate with one or more networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) via network adapter 55. Figure 5 As shown, the network adapter 55 communicates with other modules of the electronic device via the bus 53. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in conjunction with the electronic device, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0183] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

[0184]

[0185]

[0186]

[0187]

Claims

1. A method for calculating water environment capacity, characterized in that: The method comprises the following steps: Divide and calculate river sections according to the water function sections and the positions of the control sections, wherein the division principle includes the position of the control section, the water function section and the flow direction of the river, and the calculated river sections include river sections with only the control section, river sections with the control section located in the middle of the water function section and river sections with only the water function section, wherein the river sections with the control section located in the middle of the water function section include upstream boundary-control section river sections and control section-downstream boundary river sections; According to the water quality targets and control requirements of each of the calculated river sections, the calculation boundaries of the calculated river sections are obtained, wherein the calculation boundaries include the water quality calculation boundaries of the control water function area, the calculation boundaries of the non-water function area, and the section assessment targets; Determine a water environment capacity calculation method and corresponding calculation parameters for each calculated river section based on the calculation boundary and the river characteristics of the calculated river section; Based on the calculation method and the calculation parameters, the water environment capacity of each of the calculated river sections is obtained, specifically including: based on the preset water environment capacity calculation method and calculation parameters, the overall water environment capacity of the water function area of ​​each of the calculated river sections and the water environment capacity of the control section are obtained; the overall water environment capacity of the water function area of ​​each of the calculated river sections and the water environment capacity of the control section are compared to obtain the smaller value as the water environment capacity of the calculated river section; and after obtaining the smaller value as the water environment capacity of the calculated river section, the total water environment capacity of the river and the administrative area is obtained by performing spatial and temporal statistical accumulation according to the target river channel and administrative area, using the following formula: Where M represents the total water environment capacity, M ij It represents the water environment capacity of the ith river section in the jth time period, m represents the number of river sections, and n represents the number of days in the calculation period.

2. The water environment capacity calculation method according to claim 1, characterized in that: The water environment capacity calculation method includes a method for calculating the overall water environment capacity of a water functional area based on the calculation boundary and a method for calculating the water environment capacity of a control section.

3. The water environment capacity calculation method according to claim 1, characterized in that: The water environment capacity calculation method includes a zero-dimensional model method, a one-dimensional model method, a two-dimensional model method, a model trial and error method, a linear programming method, a random programming method, a probability dilution model method, a grey system theory method, and a blind number theory method.

4. The water environment capacity calculation method according to claim 1, characterized in that: The calculation parameters include: capacity calculation scale, hydrological guarantee rate, and degradation coefficient.

5. The method for calculating water environment capacity according to claim 1, characterized in that: After obtaining the smaller value as the water environment capacity of the calculated river section, the method further includes optimizing the allocation of the water environment capacity of each calculated river section by using an optimization algorithm based on the optimization target and constraint conditions.

6. A water environment capacity calculation system, characterized in that: The system includes a river section division module, a boundary acquisition module, a method setting module and a capacity calculation module; The river section division module is used to divide and calculate the river section according to the water function section and the control section position, wherein the division principle includes the position of the control section, the water function section and the flow direction of the river, and the calculated river section includes the river section with only the control section, the river section with the control section located in the middle of the water function section and the river section with only the water function section, wherein the river section with the control section located in the middle of the water function section includes the upstream boundary-control section river section and the control section-downstream boundary river section; The boundary acquisition module is used to obtain the calculation boundary of the calculated river section according to the water quality target and control requirements of each calculated river section, wherein the calculation boundary includes the water quality calculation boundary of the control water function area, the calculation boundary of the non-water function area and the section assessment target; The method setting module is used to determine the water environment capacity calculation method and corresponding calculation parameters of each calculated river section based on the calculation boundary; The capacity calculation module is used to obtain the water environment capacity of each of the calculated river sections based on the calculation method and calculation parameters, specifically including: based on the preset water environment capacity calculation method and calculation parameters, obtaining the overall water environment capacity of the water function area of ​​each of the calculated river sections and the water environment capacity of the control section that meets the standard; comparing the overall water environment capacity of the water function area of ​​each of the calculated river sections and the water environment capacity of the control section that meets the standard, and obtaining the smaller value as the water environment capacity of the calculated river section; and after obtaining the smaller value as the water environment capacity of the calculated river section, performing spatial and temporal statistical accumulation according to the target river channel and administrative area to obtain the total water environment capacity of the river channel and administrative area, using the following formula: Where M represents the total water environment capacity, M ij It represents the water environment capacity of the ith river section in the jth time period, m represents the number of river sections, and n represents the number of days in the calculation period.

7. An electronic device, characterized in that: The electronic device comprises: a processor and a memory; The memory is used to store computer programs; The processor is used to execute the computer program stored in the memory so that the electronic device executes the water environment capacity calculation method according to any one of claims 1 to 5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by an electronic device, the water environment capacity calculation method according to any one of claims 1 to 5 is implemented.

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