Method and system for predicting pollutant reduction amount of water diversion and diversion project regulation and storage reservoir

Abstract

The method comprises the following steps: (1) collecting water quality routine monitoring data of a water source area of the water diversion and diversion project, the regulation and storage reservoir and main branches thereof, and pollutant river entering quantity, regulation and storage reservoir shoreline data and reservoir entering and exiting flow of different river sections; (2) predicting the water quality condition of the regulation and storage reservoir, and calculating the pollutant reduction amount of the regulation and storage reservoir; (3) calculating the pollutant allowable concentration of the main and branch river mouths of the regulation and storage reservoir, inversely calculating the pollutant allowable concentration of different river sections, calculating the pollutant concentration of different river sections, and determining the land pollutant reduction amount of the regulation and storage reservoir and the land pollutant reduction amount of different river sections of the main and branch flows; and (4) calculating the reduction amount of pollutants in the water area of the regulation and storage reservoir. The invention provides a water and land planning pollutant reduction method, establishes a water quality safety guarantee prediction system for a water diversion and diversion project regulation and storage reservoir, and provides a systematic methodology for calculation of the reservoir reduction amount of pollutants in a region (basin).

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pollutant prediction, and more particularly to a method and system for predicting pollutant reduction of a reservoir for water diversion and regulation. BACKGROUND

[0002] A water diversion and regulation project generally consists of a water source project, a water conveyance project, control and cross structures, a reservoir for water diversion and regulation, and terminal supporting projects, and is generally divided into a water source area and a downstream area of the water source, a water conveyance route area, and a receiving area. A large water diversion and regulation project generally crosses two or more river basins or water resource divisions, and has the characteristics of wide involvement and diversified environmental impact. The construction and operation of a water diversion and regulation project will inevitably have an impact on the surface water environment while solving the problem of water resource shortage.

[0003] The reservoir for water diversion and regulation is an important part of the water diversion and regulation project, and ensuring the water quality safety is the primary task to ensure the normal performance of the water supply benefit of the water diversion and regulation project. Reducing the amount of pollutants entering the reservoir is the primary way to achieve stable and standard water quality of the reservoir for water diversion and regulation, and the key problem is how to determine the sources of pollutant reduction and the amount of pollutant reduction. In order to distinguish the responsibility of the reservoir (a certain reservoir in the region before being determined as the reservoir for water diversion and regulation of the water diversion and regulation project) and the water diversion and regulation project, it is usually required to ensure the stable and standard water quality of the reservoir through pollutant reduction measures before the implementation of the water diversion and regulation project, and on this basis, through direct purification measures of the water diversion and regulation project or equivalent replacement reduction measures of pollutants in the reservoir basin, the newly added pollutants brought by the water supplement of the water diversion and regulation project are reduced. Among them, the formulation of the pollutant reduction measures of the reservoir is more based on the whole reservoir (small and medium-sized reservoirs) or typical bay (large reservoirs), and the amount of pollutants entering the reservoir from the land is determined by calculating the water pollution carrying capacity and the amount of pollutants entering the reservoir from the land, to determine the land pollutant emission reduction scheme and the amount of land pollutant reduction.

[0004] The pollutant source of a reservoir is generally composed of two parts, i.e., land exogenous pollutant input and water endogenous pollutant release. The land pollutant input reduction is mainly realized through a series of engineering and non-engineering measures such as source reduction, process control and end reduction, and the water endogenous pollutant release control is implemented through measures such as water landscape construction and aquatic organism regulation. Among them, the water endogenous pollutant release control measures generally have the characteristics of low cost and good landscape effect. Reasonable determination of the land and water pollutant reduction amount can ensure the water quality safety of the reservoir while avoiding the problems of excessive investment and resource waste caused by the fact that the land and water pollutant reduction targets are all borne by the land reduction measures. However, the existing pollutant reduction method system has the following shortcomings: 1. The land pollutant input reduction takes the river as a whole, and cannot clearly define the land pollutant input reduction target of different river sections; 2. The pollutant reduction mainly depends on the land pollutant reduction, and ignores the water pollutant reduction target requirement; 3. The water-land integrated pollutant reduction method system considering the pollutant reduction requirement of the water supplement of the water diversion project has not been established. SUMMARY

[0005] The purpose of the present application is to consider the influence of the basin pollutant input and the water diversion project implementation on the water quality of the reservoir, to calculate the land and water pollutant reduction amount of the reservoir, and to further determine the land pollutant spatiotemporal reduction amount, and to propose a pollutant reduction amount prediction method and system for the reservoir of the water diversion project.

[0006] Based on the above problems, the present application adopts the following technical scheme: A pollutant reduction amount prediction method for the reservoir of the water diversion project, comprising the following steps: Step 1. Collect the water inflow and outflow position of the reservoir, the long series monthly flow process of the reservoir, the pollutant input amount of different river sections of the main tributaries in the present situation year and the design level year respectively; collect the monthly water quality monitoring data of the water source area of the water diversion project, the reservoir and its main tributaries in the past three years, the shoreline data of the reservoir, and the empirical value of the pollutant degradation coefficient of other rivers in the same water resources partition; monitor the pollutant concentration in different water areas with different time intervals and the main tributary inflow point as the center; Step 2. Obtain the monthly pollutant concentration monitoring value of the reservoir in the present situation year and the monthly pollutant concentration prediction value of the reservoir in the design level year, and compare them with the upper limit of the pollutant concentration under the water quality management target, respectively, to calculate the monthly pollutant reduction amount of the reservoir in the present situation year and the design level year; Step 3. According to the monthly flow process of the current year and the design level year dry year, the pollutant storage capacity of the reservoir in the current year and the design level year is calculated respectively, and the allowable inflow concentration of the reservoir is calculated; according to the pollutant inflow of the main tributary in different river sections, the monthly concentration of the pollutant in different river sections in the current year and the design level year dry year is calculated respectively, and the allowable inflow concentration of the pollutant is determined; by comparing the monthly inflow concentration of the pollutant in the main tributary of the reservoir with the monthly allowable inflow concentration of the pollutant, the reduction amount of the land pollutant in the main tributary in the dry year after the implementation of the water diversion project in the current year and the design level year is calculated; Step 4. The monthly allowable concentration of the pollutant in different river sections is calculated by inversely calculating the monthly allowable concentration of the pollutant in the main tributary of the reservoir, and the reduction amount of the land pollutant in different river sections of the main tributary in the dry year in the current year and the design level year is calculated by comparing the monthly concentration of the pollutant in different river sections with the monthly allowable concentration of the pollutant. Step 5. The monthly reduction amount of the pollutant in the water area of the reservoir in the dry year in the current year is calculated; the monthly reduction amount of the pollutant in the water area of the reservoir in the dry year in the design level year is calculated according to the principle that the implementation of the water diversion project does not increase the pollutant load.

[0007] Further, in step 2, the dry year is the year corresponding to the 90% guarantee rate of the average flow obtained by arranging the long series of inflow flow in the current year or the design level year after the implementation of the water diversion project; The first month of the dry year of the reservoir in the design level year after the implementation of the water diversion project i The first month of the dry year of the reservoir in the design level year after the implementation of the water diversion project j The first month of the dry year of the reservoir in the design level year after the implementation of the water diversion project

[0008]

[0009] In the formula, The first month of the dry year of the reservoir in the design level year after the implementation of the water diversion project i The first month of the dry year of the reservoir in the design level year after the implementation of the water diversion project j The first month of the dry year of the reservoir in the design level year after the implementation of the water diversion project q i,des The first month of the dry year of the reservoir in the design level year after the implementation of the water diversion project i The first month of the dry year of the reservoir in the design level year after the implementation of the water diversion project 3 The first month of the dry year of the reservoir in the design level year after the implementation of the water diversion project The first month of the dry year of the reservoir in the design level year after the implementation of the water diversion project i The first month of the dry year of the reservoir in the design level year after the implementation of the water diversion project j The first month of the dry year of the reservoir in the design level year after the implementation of the water diversion project The first month of the dry year of the reservoir in the design level year after the implementation of the water diversion project i The first month of the dry year of the reservoir in the design level year after the implementation of the water diversion project 3 The first month of the dry year of the reservoir in the design level year after the implementation of the water diversion project The first month of the dry year of the reservoir in the design level year after the implementation of the water diversion project i The first month of the dry year of the reservoir in the design level year after the implementation of the water diversion project 3; The time (s) for the water in the reservoir to fully mix during the dry year after the implementation of the designed annual water diversion project; The current annual regulating reservoir i Month j Concentration of the pollutant, mg / L; and The following are the current year and design year, respectively, the dry year after the implementation of the water diversion project, and the first reservoir bay at the end of a tributary of the regulating reservoir. i Month j The comprehensive degradation coefficient of the pollutants, 1 / s; The current situation is the 20th year of dry season. i Monthly inflow to the regulating reservoir, m 3 / s; The current situation is that the reservoir is located at the end of a tributary of a reservoir during dry seasons. i Average water depth in the monthly diffusion zone, m; The current situation is that the reservoir is located at the end of a tributary of a reservoir during dry seasons. i Lunar diffusion region diffusion angle, rad; and The radii (in meters) are the diffusion zones centered on the ends of the main tributaries in the current year and the dry year, respectively. and The current annual and dry year diffusion zone radii are respectively: and The concentration of the same pollutant at that time, in mg / L.

[0010] Furthermore, the first [value] was calculated from the monitored and predicted values ​​of pollutant concentrations in the regulating reservoir during dry years after the implementation of the water diversion project in the current year and the design level year. i Month j The calculation methods for the reduction of various pollutants are as follows:

[0011] In the formula, X ij,now0 and X ij,des0 These are the current year and the design year based on water quality targets, respectively, the dry year after the implementation of the water diversion project. i Month j Pollutant reduction amount, g / s; c s,j Under the water quality management objectives of water storage reservoirs, the first j The upper limit of the concentration of each pollutant, in mg / L.

[0012] Furthermore, in step 3, the current year and design level year of the water diversion project are compared with the dry year of the reservoir after the implementation of the project. i Month jThe calculation method for the permissible concentration of pollutants entering the storage is as follows:

[0013]

[0014] In the formula, c ij,ynow , c ij,ydes These are the current year and the design year, respectively, the dry year after the implementation of the water diversion project, and the reservoir's first [year]. i Month j Permissible concentration of pollutants entering the storage facility, mg / L; M ij,now , M ij,des These are the current year and the design year, respectively, the dry year after the implementation of the water diversion project, and the reservoir's first [year]. i Month j Pollutant carrying capacity, g / s; When the regulating reservoir is a small to medium-sized reservoir, the current year and the design level year are the dry years after the implementation of the water diversion project. i Month j The calculation method for the pollution carrying capacity of each pollutant is as follows:

[0015]

[0016] In the formula, The current year's dry season is the first year of water storage reservoir. i Monthly outflow rate, m 3 / s; The current year's dry season is the first year of water storage reservoir. i Monthly reservoir volume, m 3 ; When the regulating reservoir is a large reservoir, the current year and the design level year, after the implementation of the water diversion project, the dry year of a certain major tributary of the regulating reservoir, i Month j The calculation method for the pollution carrying capacity of each pollutant is as follows:

[0017]

[0018] In the formula, The design level is based on the implementation of the water diversion project, and the dry season is the first year of the reservoir at the end of a tributary of the reservoir. i Average water depth in the monthly diffusion zone, m; The design level is based on the implementation of the water diversion project, and the dry season is the first year of the reservoir at the end of a tributary of the reservoir. i Lunar diffusion region diffusion angle, rad; and These are the current year and the design year, respectively, the dry year after the implementation of the water diversion project. i The radius of the diffusion zone centered at the end of the main tributary, in meters.

[0019] Furthermore, in step 3, a major tributary is divided along the direction of water flow into... N +1 river section, depending on the distribution of pollution sources within the catchment area. N For each river section, the pre-pollutant pollution source distribution was calculated separately. N The amount of pollutants entering the river in a certain section of the river, the current situation in a dry year, and the water level of a certain tributary of a regulating reservoir. x The first section of the river j Concentration of pollutants and the first j Concentration of pollutants entering the database The calculation method is as follows: x =1,2,3…… N

[0020] In the formula, and The current situation is that of a certain tributary in a dry year. x -1 river section and the N +1 river section i Monthly traffic, m 3 / s; and These are the current year and the dry year of a certain tributary. x The river section, the first x -1 river section and the N The first section of the river i Month j Concentration of the pollutant, mg / L; The current situation is the dry year of a certain tributary terminal section i Month j Concentration values ​​of various pollutants entering the storage, mg / L; For the current situation of a certain branch in a certain year x The first section of the river i Month j The amount of each pollutant entering the river, in g / s; For the current situation of a certain branch in a certain year x The first section of the river i Monthly wastewater discharge into the river, m 3 / s; For a certain branch x The length of each river segment, in meters; For a certain branch N+ The length of one river segment, in meters (m). and Each of the following is a branch of the river. x- 1 section and the first N +1 river section i Month j The comprehensive degradation coefficient of pollutants, 1 / s, is based on empirical values ​​of pollutant degradation coefficients from other rivers within the same water resource zone. and The current situation of a certain branch in the current year x- 1 section and the first N +1 river section i Average cross-sectional width per month, m 2 ; After the implementation of the designed annual water diversion project, during dry years, the reservoir on a certain tributary... x The first section of the river i Month j Concentration of pollutants entering the database The calculation method is as follows: x =1,2,3…… N

[0021] In the formula, and For the dry year of a certain tributary after the implementation of the designed horizontal water diversion project x -1 river section and the N +1 river section i Monthly traffic, m 3 / s; and These are the results of the water diversion project implemented at the designed annual level, and the dry season of a certain tributary. x -1 river section and the N The first section of the river i Month j Concentration of the pollutant, mg / L; The design level is based on the implementation of a water diversion project, and the dry season is the first year at the end of a certain tributary. i Month j Concentration values ​​of various pollutants entering the storage, mg / L; After the implementation of the designed horizontal water diversion project, a certain branch of the project... x The first section of the river i Month j The amount of each pollutant entering the river, in g / s; After the implementation of the designed horizontal water diversion project, a certain branch of the project... x The first section of the river i Monthly wastewater discharge into the river, m 3 / s; and These are the first tributaries after the implementation of the designed annual water diversion project. x- 1 section and the first N +1 river section i Average cross-sectional width per month, m 2 .

[0022] Furthermore, in step 3, the pollutant inflow concentration at the end of a tributary of the reservoir during a dry year after the implementation of the water diversion project in the current year and the design level year is used to calculate the first pollutant concentration in the land area of ​​the reservoir during a dry year. i Month j The calculation methods for the reduction of various pollutants are as follows:

[0023]

[0024] In the formula, X ij,now1 and X ij,des1 These are the current year and design year based on the pollution carrying capacity, respectively, and the dry year after the implementation of the water diversion project, representing the first year of dry season in the land area of ​​the regulating reservoir. i Month j Pollutant reduction amount, g / s.

[0025] Furthermore, in step 4, a major tributary is divided along the direction of water flow into... N +1 river section, depending on the distribution of pollution sources within the catchment area. N For each river section, starting with the allowable concentration of a certain pollutant entering the reservoir, the allowable concentration of that pollutant at each node is calculated in reverse order. The calculation method for the allowable concentration of a certain pollutant in each section of a tributary during the current dry year is as follows:

[0026] 0,1,2…… N -1 In the formula, , , These are, respectively, a node at the end of a tributary in the current year and the dry year, and the first... z The river section, the first z+ 1 section of the river i Month j Permissible concentration values ​​for each pollutant, mg / L; and These are the nodes at the end of a certain branch and the first... z The first section of the river i Month j The comprehensive degradation coefficient of the pollutants, 1 / s; and These are respectively the distance from the end of a branch to the previous node and the first z The length of each river segment, in meters; and These represent the current state of a certain tributary from its terminal point to the previous node and the first... z The first section of the river i Average cross-sectional width per month, m 2 ; and These represent the current year, the dry year, and the point from the end of a tributary to the previous node and the first... z The first section of the river i Average monthly flow, m 3 / s; The calculation method for the allowable concentration of a certain pollutant in each section of a tributary during a dry year after the implementation of the designed annual water diversion project is as follows:

[0027] 0,1,2…… N -1 In the formula, , , These are, respectively, a node at the end of a tributary during a dry year after the implementation of the designed annual water diversion project; the first... z The river section, the first z+ 1 section of the river i Month j Permissible concentration values ​​for each pollutant, mg / L; and These represent the distance from the end of a tributary to the previous node and the first node after the implementation of the designed annual water diversion project. z The first section of the river i Average cross-sectional width per month, m 2 ; and These represent the distance from the end of a tributary to the previous node and the first node during a dry year after the implementation of the designed horizontal water diversion project. z The first section of the river i Average monthly flow, m 3 / s; Considering the water quality standards required for a certain river section, and comparing it with the first node... i Month j The difference between the permissible concentration and the calculated concentration of a pollutant, and the current situation at a certain node of a certain tributary during a dry year. i Month j The reduction amount of each pollutant is calculated as follows:

[0028]

[0029] In the formula, and These are the current year's dry year's source of a certain tributary and the first x The first section of the river i Month j Pollutant reduction amount, g / s; , and These are the current year's dry year's source of a certain tributary, the first x -1 river section, the x The first section of the river i Monthly traffic, m 3 / s; and These are the current year's dry year's source of a certain tributary and the first x The first section of the river i Month j Concentration of each pollutant, mg / L; and These are the current year's dry year's source of a certain tributary and the first x The first section of the river j Upper limit of concentration for each pollutant, mg / L; and These are the current year's dry year's source of a certain tributary and the first x The first section of the river i Month j Permissible concentration values ​​for each pollutant, mg / L; After the implementation of the designed annual water diversion project, during a dry year, at a certain node on a certain tributary... i Month j The reduction amount of each pollutant is calculated as follows:

[0030] In the formula, and These are the source of a tributary and the first tributary after the implementation of the designed annual water diversion project. x The first section of the river i Month j Pollutant reduction amount, g / s; , and These are the headwaters of a tributary after the implementation of the designed annual water diversion project. x -1 river section, the x The first section of the river i Monthly traffic, m 3 / s; and These are the source of a tributary and the first tributary after the implementation of the designed annual water diversion project. x The first section of the riveri Month j Concentration of the pollutant, mg / L; and These are the source of a tributary and the first tributary after the implementation of the designed annual water diversion project. x The first section of the river j Upper limit of concentration for each pollutant, mg / L; and These are the source of a tributary and the first tributary after the implementation of the designed annual water diversion project. x The first section of the river i Month j Permissible concentration values ​​for each pollutant, in mg / L.

[0031] Furthermore, in step 4, the water diversion project is implemented at the designed level for the following year. x The first section of the river i Month j The principle is that the amount of pollutants entering the river will not increase compared to the current situation. After the implementation of the designed annual water diversion project, at a certain node of a certain tributary during a dry year... i Month j The calculation methods for the reduction of various pollutants are as follows:

[0032]

[0033] In the formula, To ensure the implementation of the designed water diversion project in the first year x The first section of the river i Month j The design level of a certain tributary after the implementation of a water diversion project is calculated with the boundary condition that the amount of pollutants entering the river does not increase compared to the current situation. x The first section of the river i Month j Pollutant reduction amount, g / s; The final design level of a certain tributary water diversion project after its implementation. x The first section of the river i Month j Pollutant reduction amount, g / s.

[0034] Furthermore, in step 5, the method for determining the monthly pollutant reduction amount in the reservoir water area during dry years after the implementation of the water diversion project in the current year and design level year is as follows:

[0035]

[0036]

[0037] In the formula, and These are the current year and the design year, respectively, the dry year of the water diversion project after its implementation. i Month j Pollutant reduction amount, g / s; The design level for the annual water diversion project during the dry season. i Monthly Hydration Process (Step 1) j The amount of newly added pollutants, g / s; q is The first water diversion project designed for the dry year. i Monthly replenishment flow to the regulating reservoir, m 3 / s; The current annual water diversion project is located in the water source area of ​​the first i Month j Concentration of each pollutant, mg / L; The current annual regulating reservoir i Month j The concentration of each pollutant is expressed in mg / L; ∑ represents the sum of the reduction amounts of multiple tributaries flowing into the reservoir, in g / s. On the other hand, the present invention provides a system for predicting the pollutant reduction of water diversion and regulation reservoirs, comprising: Module 1. It is used to collect data on the inflow and outflow locations of water in the regulating reservoirs for current and design years, as well as the long-term monthly flow processes and pollutant inflow amounts in different sections of major tributaries; to collect monthly water quality monitoring data for the water source areas of water diversion projects, regulating reservoirs, and their major tributaries for the past three years, as well as shoreline data of regulating reservoirs and empirical values ​​of pollutant degradation coefficients for other rivers within the same water resource zone; and to monitor pollutant concentrations in different water areas at different time intervals, centered on the inflow points of major tributaries. Module 2. It is used to obtain the monthly monitoring values ​​of pollutant concentrations in the current year and the predicted values ​​of pollutant concentrations in the reservoir during the dry season of the design level year, and compare them with the upper limit of each pollutant concentration under the water quality management target, and calculate the monthly pollutant reduction amount of the reservoir during the dry season of the current year and the design level year. Module 3. It is used to calculate the pollutant carrying capacity and allowable inflow concentration of the regulating reservoir in the current year and the design level year based on the monthly flow process during the dry season in the current year and the design level year; based on the pollutant inflow of different sections of the main tributaries, it calculates the monthly pollutant concentration of different sections during the dry season in the current year and the design level year and determines the pollutant inflow concentration; it compares the monthly pollutant inflow concentration of the main tributaries of the regulating reservoir with the monthly allowable inflow concentration of pollutants; and calculates the amount of land-based pollutant reduction of the main tributaries after the implementation of the water diversion project in the current year and the design level year. Module 4. It is used to calculate the monthly allowable pollutant concentration in different river sections by using the monthly allowable inflow concentration of pollutants in the main tributaries of the regulating reservoir, compare the monthly pollutant concentration in different river sections with the monthly allowable pollutant concentration, and calculate the amount of land pollutant reduction in different river sections of the main tributaries in the current year and the design level year during the dry season. Module 5. It is used to calculate the monthly pollutant reduction in the water area of ​​the regulating reservoir during the current dry year; and to calculate the monthly pollutant reduction in the water area during the design dry year, based on the principle that the implementation of the water diversion project will not increase the pollutant load.

[0038] Compared with the prior art, the present invention has the following beneficial effects: 1) By determining the allowable concentration of pollutants at the end of the river flowing into the reservoir (at the reservoir's inlet) based on the water body's pollution carrying capacity, and comparing this with the upper limit requirements of the target concentration for water quality management in different river sections, the allowable concentration of pollutants in different river sections at different times is calculated. Furthermore, based on the difference between the pollutant concentration and the allowable concentration in each river section, and the river flow rate, the pollutant reduction amount for different river sections at different times is calculated. Compared to existing technologies, this invention optimizes and adjusts the traditional pollutant reduction amount for reservoirs from the annual value at the end of the river flowing into the reservoir (at the reservoir's inlet) to values ​​for different river sections at different times, which is more conducive to guiding the formulation of pollutant reduction plans for different regions and periods of land.

[0039] 2) By comparing the difference between the amount of pollutant reduction entering the reservoir and the sum of the pollutant reduction amounts at the ends of each river flowing into the reservoir (at the reservoir's inlet), the amount of pollutant reduction in the reservoir area at different times before and after the implementation of the water diversion project is determined. Compared with existing technologies, this invention expands the traditional model of reducing pollutant entering the reservoir from a single land-based model to a model that reduces pollutants entering the reservoir from both land and water areas. This avoids the problems of excessive investment and resource waste caused by relying solely on land-based reduction measures to achieve pollutant reduction targets in both land and water areas.

[0040] 3) Considering the pollutant reduction requirements of water diversion projects, we propose a water-land integrated pollutant reduction method under different scenarios before and after the implementation of water diversion projects, and establish a water quality safety prediction system for water diversion project reservoirs, providing a systematic, novel and applicable methodology for calculating the reduction of pollutants entering rivers in the region (basin). Attached Figure Description

[0041] Figure 1 This invention provides a flowchart for predicting the reduction of pollutants in water diversion and regulation reservoirs.

[0042] Figure 2 Flowchart for calculating pollutant reduction in water storage reservoirs.

[0043] Figure 3 Flowchart for calculating the reduction of land-based pollutants in water storage reservoirs.

[0044] Figure 4 A flowchart for calculating the reduction of land-based pollutants in different sections of the main tributaries of the reservoir.

[0045] Figure 5 A flowchart for calculating the reduction of pollutants in the water area of ​​a water storage reservoir. Detailed Implementation

[0046] To facilitate understanding and implementation of the present invention by those skilled in the art, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0047] Given the shortcomings of existing pollutant reduction methods, such as the inability to clearly define the reduction targets for land-based pollutants entering rivers in different river sections and the neglect of pollutant reduction targets for water areas, this paper establishes for the first time a comprehensive land-water pollutant reduction method that considers the pollutant reduction requirements of water diversion projects. It proposes a method and system for predicting pollutant reduction in reservoirs of water diversion projects. Using the allowable concentration values ​​of pollutants in different river sections of the main tributaries of the reservoir as a link, the method calculates the pollutant reduction in the reservoir water area by calculating the pollutant reduction in the reservoir, the land-based pollutant reduction, and the newly added pollutants from the water diversion project, and determines the pollutant reduction in different river sections of the main tributaries, thus improving the pollutant reduction method system for lakes and reservoirs.

[0048] This invention predicts the water quality of the reservoirs after the implementation of the water diversion project in the design year by collecting routine monitoring data on the water quality of the source area, regulating reservoirs, and major tributaries of the current year, as well as the inflow and outflow data of the regulating reservoirs after the implementation of the water diversion project in the current year and the design year, and the amount of pollutants entering the rivers of different sections of the major tributaries. Using water quality target requirements as constraints, it calculates the amount of pollutant reduction in the regulating reservoirs after the implementation of the project in the current year and the design year. Secondly, it calculates the pollution carrying capacity of the estuary areas of the major tributaries after the implementation of the project in the current year and the design year, and determines the pollution levels at the estuaries. The allowable concentrations of pollutants and the allowable concentrations of pollutants in different river sections are calculated based on the results of pollution source surveys. The allowable concentrations of pollutants at tributary estuaries are compared to determine the reduction amount of land-based pollutants entering the reservoir from the main rivers flowing into the reservoir. The allowable concentrations of pollutants in different sections of tributaries are compared to determine the reduction amount of land-based pollutants in different sections of the main rivers flowing into the reservoir. Finally, considering the reduction amount of pollutants in the regulating reservoir and the reduction amount of major pollutants entering the river from tributaries, and based on the principle that the implementation of the water diversion project will not increase the pollutant load, the reduction amount of pollutants in the water area of ​​the regulating reservoir after the implementation of the water diversion project in the current year and the design level year is calculated.

[0049] Example 1 The present invention will now be described in detail using the example of predicting water quality safety in the regulating reservoir of the EB Water Resources Allocation Project (hereinafter referred to as "EB Project"). This invention also has guiding significance for predicting water quality safety in the regulating reservoir of other water diversion projects.

[0050] The EB project uses the DC Reservoir as its water source, starting at the DC Reservoir dam, traversing the EB hill area from northwest to southeast, and ending at the tail of the W Reservoir. The total length of the water conveyance line is approximately 270 km, and the water receiving area is approximately 10,000 km². 2 To ensure flexibility in water resource allocation, the EB project designates the existing large reservoir, FC Reservoir, located in the lower reaches of the water conveyance line, as an online regulating reservoir. The FC Reservoir dam controls a catchment area of ​​460 km². 2 The basin has an average annual temperature of 15.7℃ and an average annual precipitation of 958 mm, of which the average annual precipitation during the flood season or irrigation season (May to September) is 675 mm; the average annual runoff is 172 million m³. 3 The average annual runoff during the flood season or irrigation season is 121 million cubic meters. 3 The FC Reservoir has multi-year regulation capabilities, with a normal water level of 124.0m; the total reservoir capacity is 265 million m³. 3 Of which, the effective storage capacity is 137 million m³. 3 Dead storage capacity 0.558 billion m³ 3 The hydraulic retention time is approximately 407 days, indicating a relatively weak water exchange capacity. FC Reservoir is a river-type reservoir with a surface area of ​​20.14 km². 2 The average water surface width is 500m, involving major inflow rivers A, B, and C, with river B being the main stream of the FC reservoir. The FC reservoir is a crucial online regulating reservoir for the EB project. The EB project uses the right abutment of the FC reservoir as the water replenishment point and the left abutment of the FC reservoir as the starting point of the water conveyance tunnel to achieve the goal of replenishing water to the receiving area. Figure 1 ).

[0051] In this embodiment, the conversion of seconds to months via time conversion mainly includes the following steps: Step 1. Collect data on the inflow and outflow locations of the regulating reservoirs for the current year and the design year, as well as the monthly flow process and pollutant inflow amounts in different sections of the main tributaries; collect monthly water quality monitoring data for the water source area of ​​the water diversion project, the regulating reservoirs and their main tributaries for the past three years, shoreline data of the regulating reservoirs, and empirical values ​​of pollutant degradation coefficients for other rivers within the same water resource zone; monitor pollutant concentrations in different water areas at different time intervals, centered on the inflow points of the main tributaries.

[0052] Table 1. Current Annual Total Phosphorus Inflow into Rivers by Section (Unit: t)

[0053] Table 2 Total Phosphorus Inflow into Rivers by Section after Implementation of Water Diversion Project at Design Horizontal Year (Unit: t)

[0054] Step 2. Obtain the monthly monitoring values ​​of pollutant concentrations in the current year and the predicted values ​​of pollutant concentrations in the reservoir during the dry season of the design level year. Compare these values ​​with the upper limits of each pollutant concentration under the water quality management target, and calculate the monthly pollutant reduction amount in the reservoir during the dry season of the current year and the design level year.

[0055] Table 3 shows the monthly inflow rates during dry seasons calculated from long-term data.

[0056] Table 4. Monthly average total phosphorus monitoring data for the past three years for the water source area, regulating reservoir and its main tributaries of the water diversion project. Unit: mg / L

[0057] Table 5. Monthly Total Phosphorus Reduction in Regulating Reservoirs During Dry Years (Unit: t)

[0058] Table 6 Monthly Inflow and Outflow Flow of Regulating Reservoirs During Dry Years After Implementation of the Design-Level Annual Water Diversion Project (Unit: m³) 3 / s

[0059] Table 7. Monthly Predicted Total Phosphorus Concentration in Regulating Reservoirs During Dry Years After Implementation of the Design-Level Annual Water Diversion Project (Unit: mg / L)

[0060] Table 8. Monthly Reduction of Total Phosphorus in Regulating Reservoirs During Dry Seasons After Implementation of the Design-Level Annual Water Diversion Project (Unit: t)

[0061] Step 3. Based on the monthly flow process of the current year and the design level year during the dry season, calculate the pollutant carrying capacity and allowable inflow concentration of the regulating reservoir for the current year and the design level year respectively; based on the pollutant inflow of different sections of the main tributaries, calculate the monthly pollutant concentration of different sections of the river during the dry season for the current year and the design level year respectively, and determine the pollutant inflow concentration; compare the monthly inflow concentration of pollutants of the main tributaries of the regulating reservoir with the monthly allowable inflow concentration of pollutants, and calculate the amount of land-based pollutant reduction of the main tributaries after the implementation of the water diversion project in the current year and the design level year during the dry season. Table 9. Monthly Total Phosphorus Retention Capacity of Regulating Reservoirs in Current Dry Years (Unit: t)

[0062] Table 10. Monthly Allowable Total Phosphorus Concentration in Regulating Reservoirs During Current Dry Years (Unit: mg / L)

[0063] Table 11 Monthly Total Phosphorus Carrying Capacity of Regulating Reservoirs During Dry Years After Implementation of the Design-Level Annual Water Diversion Project (Unit: t)

[0064] Table 12 Monthly Allowable Total Phosphorus Concentration in Reservoirs During Dry Years After Implementation of the Design-Level Annual Water Diversion Project (Unit: mg / L)

[0065] Table 13 Total phosphorus concentration and inflow concentration in different river sections during current dry years (unit: mg / L)

[0066] Table 14 Total phosphorus concentration and its concentration entering the river after the implementation of the water diversion project at the design annual level (Unit: mg / L)

[0067] Table 15 Monthly Reduction of Total Phosphorus Inflow into Regulating Reservoirs in Current Years and Dry Years (Unit: t)

[0068] Table 16 Monthly Reduction of Total Phosphorus Inflow into Main Tributaries of the Regulating Reservoir During Dry Years After Implementation of the Design-Level Water Diversion Project (Unit: t)

[0069] Step 4. Calculate the monthly allowable pollutant concentrations for different river sections by using the monthly allowable inflow concentrations of pollutants in the main tributaries of the reservoir. Compare the monthly pollutant concentrations in different river sections with the monthly allowable pollutant concentrations to calculate the land-based pollutant reduction in different river sections of the main tributaries during the current year and the design level year dry season.

[0070] Table 17 Permissible Total Phosphorus Concentration Values ​​for Tributaries of Regulating Reservoirs in Current Years and Dry Years (Unit: mg / L)

[0071] Table 18 Monthly Reduction of Total Phosphorus Inflow into Reservoirs by Tributary Sections During Current and Dry Years (Unit: t)

[0072] Table 19 Permissible Total Phosphorus Concentration Values ​​for Tributaries of the Regulating Reservoir in Dry Years After Project Implementation (Design Year) Unit: mg / L

[0073] Table 20 Monthly Total Phosphorus Reduction in Land Area of ​​Tributary Sections of Regulating Reservoirs During Dry Years After Project Implementation at Design Horizon (Unit: t)

[0074] Step 5. Calculate the monthly pollutant reduction in the water area of ​​the regulating reservoir during the current dry year; based on the principle that the implementation of the water diversion project will not increase the pollutant load, calculate the monthly pollutant reduction in the water area during the design dry year.

[0075] Table 21 Monthly Total Phosphorus Reduction in Regulating Reservoir Water Areas During Current Dry Years (Unit: t)

[0076] Table 22 Monthly Increase in Pollutants During Dry Years After Implementation of the Water Diversion Project at Design Horizon (Unit: t)

[0077] Table 23 Monthly Reduction of Total Phosphorus Pollutants in the Regulating Reservoir Water Area During Dry Years After the Implementation of the Design-Level Annual Water Diversion Project (Unit: t)

[0078] Example 2 This embodiment provides a system for predicting the pollutant reduction of a water diversion project's regulating reservoir, including: Module 1. It is used to collect data on the inflow and outflow locations of water in the regulating reservoirs for current and design years, as well as the long-term monthly flow processes and pollutant inflow amounts in different sections of major tributaries; to collect monthly water quality monitoring data for the water source areas of water diversion projects, regulating reservoirs, and their major tributaries for the past three years, as well as shoreline data of regulating reservoirs and empirical values ​​of pollutant degradation coefficients for other rivers within the same water resource zone; and to monitor pollutant concentrations in different water areas at different time intervals, centered on the inflow points of major tributaries. Module 2. It is used to obtain the monthly monitoring values ​​of pollutant concentrations in the current year and the predicted values ​​of pollutant concentrations in the reservoir during the dry season of the design level year, and compare them with the upper limit of each pollutant concentration under the water quality management target, and calculate the monthly pollutant reduction amount of the reservoir during the dry season of the current year and the design level year. Module 3. It is used to calculate the pollutant carrying capacity and allowable inflow concentration of the regulating reservoir in the current year and the design level year based on the monthly flow process during the dry season in the current year and the design level year; based on the pollutant inflow of different sections of the main tributaries, it calculates the monthly pollutant concentration of different sections during the dry season in the current year and the design level year and determines the pollutant inflow concentration; it compares the monthly pollutant inflow concentration of the main tributaries of the regulating reservoir with the monthly allowable inflow concentration of pollutants; and calculates the amount of land-based pollutant reduction of the main tributaries after the implementation of the water diversion project in the current year and the design level year. Module 4. It is used to calculate the monthly allowable pollutant concentration in different river sections by using the monthly allowable inflow concentration of pollutants in the main tributaries of the regulating reservoir, compare the monthly pollutant concentration in different river sections with the monthly allowable pollutant concentration, and calculate the amount of land pollutant reduction in different river sections of the main tributaries in the current year and the design level year during the dry season. Module 5. It is used to calculate the monthly pollutant reduction in the water area of ​​the regulating reservoir during the current dry year; and to calculate the monthly pollutant reduction in the water area during the design dry year, based on the principle that the implementation of the water diversion project will not increase the pollutant load.

[0079] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

[0080] It should be understood that any parts not described in detail in this specification belong to the prior art.

[0081] It should be understood that the above description of the preferred embodiments is quite detailed, but it should not be considered as a limitation on the scope of protection of this invention. Those skilled in the art, under the guidance of this invention, can make substitutions or modifications without departing from the scope of protection of the claims of this invention, and all such substitutions or modifications fall within the scope of protection of this invention. The scope of protection of this invention should be determined by the appended claims.

Claims

1. A method for predicting pollutant reduction in regulating reservoirs of water diversion projects, characterized in that, Includes the following steps: Step 1. Collect data on the inflow and outflow locations of the regulating reservoirs for the current year and the design year, as well as the monthly flow processes and pollutant inflow amounts in different sections of the main tributaries; collect monthly water quality monitoring data for the water source area of ​​the water diversion project, the regulating reservoirs, and their main tributaries for the past three years, as well as shoreline data of the regulating reservoirs and empirical values ​​of pollutant degradation coefficients for other rivers within the same water resource zone; monitor pollutant concentrations in different water areas at different time intervals, centered on the inflow points of the main tributaries. Step 2. Obtain the monthly monitoring values ​​of pollutant concentrations in the current year and the predicted values ​​of pollutant concentrations in the reservoir during the dry season of the design level year, and compare them with the upper limit of each pollutant concentration under the water quality management target, and calculate the monthly pollutant reduction amount of the reservoir during the dry season of the current year and the design level year. Step 3. Based on the monthly flow process of the current year and the design level year during the dry season, calculate the pollutant carrying capacity and allowable inflow concentration of the regulating reservoir for the current year and the design level year respectively; based on the pollutant inflow of different sections of the main tributaries, calculate the monthly pollutant concentration of different sections of the river during the dry season for the current year and the design level year respectively, and determine the pollutant inflow concentration; compare the monthly inflow concentration of pollutants of the main tributaries of the regulating reservoir with the monthly allowable inflow concentration of pollutants, and calculate the amount of land-based pollutant reduction of the main tributaries after the implementation of the water diversion project in the current year and the design level year during the dry season. Step 4. Calculate the monthly allowable pollutant concentrations for different river sections by using the monthly allowable pollutant concentrations of the main tributaries of the reservoir. Compare the monthly pollutant concentrations of different river sections with the monthly allowable pollutant concentrations to calculate the reduction of land-based pollutants in different river sections of the main tributaries during the current year and the design level year during the dry season. Step 5. Calculate the monthly pollutant reduction in the water area of ​​the regulating reservoir during the current dry year; based on the principle that the implementation of the water diversion project will not increase the pollutant load, calculate the monthly pollutant reduction in the water area during the design dry year.

2. The method for predicting pollutant reduction in a water diversion and regulation reservoir according to claim 1, characterized in that: In step 2, the dry year is the year corresponding to the 90% guaranteed annual average flow rate obtained by frequency distribution of the long series of inflows after the implementation of the water diversion project, which is based on the current year or the design level year. After the implementation of the designed annual water diversion project, the reservoir will be used for water storage during dry years. i Month j The methods for predicting the concentration of various pollutants are as follows: In the formula, The design level for the annual water diversion project, after its implementation, is the first dry year for the reservoir to regulate water levels. i Month j Concentration of each pollutant, mg / L; q i,des The first dry year after the implementation of the designed horizontal water diversion project i Monthly inflow to the regulating reservoir, m 3 / s; The first dry year after the implementation of the designed horizontal water diversion project i Month j Concentration of each pollutant entering the storage, mg / L; The design level for the annual water diversion project, after its implementation, is the first dry year for the reservoir to regulate water levels. i Monthly outflow rate, m 3 / s; The design level for the annual water diversion project, after its implementation, is the first dry year for the reservoir to regulate water levels. i Monthly reservoir volume, m 3 ; The time (s) for the water in the reservoir to fully mix during the dry year after the implementation of the designed annual water diversion project; The current annual regulating reservoir i Month j Concentration of the pollutant, mg / L; and The following are the current year and design year, respectively, the dry year after the implementation of the water diversion project, and the first reservoir bay at the end of a tributary of the regulating reservoir. i Month j The comprehensive degradation coefficient of the pollutants, 1 / s; The current situation is the 20th year of dry season. i Monthly inflow to the regulating reservoir, m 3 / s; The current situation is that the reservoir is located at the end of a tributary of a reservoir during dry seasons. i Average water depth in the monthly diffusion zone, m; The current situation is that the reservoir is located at the end of a tributary of a reservoir during dry seasons. i Lunar diffusion region diffusion angle, rad; and The radii (in meters) are the diffusion zones centered on the ends of the main tributaries in the current year and the dry year, respectively. and The current annual and dry year diffusion zone radii are respectively: and The concentration of the same pollutant at that time, in mg / L.

3. The method for predicting pollutant reduction in a water diversion and regulation reservoir according to claim 2, characterized in that: The first value was calculated from the monitored and predicted values ​​of pollutant concentrations in the reservoir during the dry season after the implementation of the water diversion project in the current year and the design year. i Month j The calculation methods for the reduction of various pollutants are as follows: In the formula, X ij,now0 and X ij,des0 These are the current year and the design year based on water quality targets, respectively, the dry year after the implementation of the water diversion project. i Month j Pollutant reduction amount, g / s; c s,j Under the water quality management objectives of water storage reservoirs, the first j The upper limit of the concentration of each pollutant, in mg / L.

4. The method for predicting pollutant reduction in a water diversion and regulation reservoir according to claim 3, characterized in that: In step 3, the current year and design level year are compared with the dry year of the water diversion project after its implementation. i Month j The calculation method for the permissible concentration of pollutants entering the storage is as follows: In the formula, c ij,ynow , c ij,ydes These are the current year and the design year, respectively, the dry year after the implementation of the water diversion project, and the reservoir's first [year]. i Month j Permissible concentration of pollutants entering the storage facility, mg / L; M ij,now , M ij,des These are the current year and the design year, respectively, the dry year after the implementation of the water diversion project, and the reservoir's first [year]. i Month j Pollutant carrying capacity, g / s; When the regulating reservoir is a small to medium-sized reservoir, the current year and the design level year are the dry years after the implementation of the water diversion project. i Month j The calculation method for the pollution carrying capacity of each pollutant is as follows: In the formula, The current year's dry season is the first year of water storage reservoir. i Monthly outflow rate, m 3 / s; The current year's dry season is the first year of water storage reservoir. i Monthly reservoir volume, m 3 ; When the regulating reservoir is a large reservoir, the current year and the design level year, after the implementation of the water diversion project, the dry year of a certain major tributary of the regulating reservoir, i Month j The calculation method for the pollution carrying capacity of each pollutant is as follows: In the formula, The design level is based on the implementation of the water diversion project, and the dry season is the first year of the reservoir at the end of a tributary of the reservoir. i Average water depth in the monthly diffusion zone, m; The design level is based on the implementation of the water diversion project, and the dry season is the first year of the reservoir at the end of a tributary of the reservoir. i Lunar diffusion region diffusion angle, rad; and These are the current year and the design year, respectively, the dry year after the implementation of the water diversion project. i The radius of the diffusion zone centered at the end of the main tributary, in meters.

5. The method for predicting pollutant reduction in a water diversion and regulation reservoir according to claim 4, characterized in that: In step 3, a major tributary is divided along the direction of water flow into... N +1 river section, depending on the distribution of pollution sources within the catchment area. N For each river section, the pre-pollutant pollution source distribution was calculated separately. N The amount of pollutants entering the river in a certain section of the river, the current situation in a dry year, and the water level of a certain tributary of a regulating reservoir. x The first section of the river j Concentration of pollutants and the first j Concentration of pollutants entering the database The calculation method is as follows: x =1,2,3…… N In the formula, and The current situation is that of a certain tributary in a dry year. x -1 river section and the N +1 river section i Monthly traffic, m 3 / s; and These are the current year and the dry year of a certain tributary. x The river section, the first x -1 river section and the N The first section of the river i Month j Concentration of the pollutant, mg / L; The current situation is the dry year of a certain tributary terminal section i Month j Concentration values ​​of various pollutants entering the storage, mg / L; For the current situation of a certain branch in a certain year x The first section of the river i Month j The amount of each pollutant entering the river, in g / s; For the current situation of a certain branch in a certain year x The first section of the river i Monthly wastewater discharge into the river, m 3 / s; For a certain branch x The length of each river segment, in meters; For a certain branch N+ The length of one river segment, in meters (m). and Each of the following is a branch of the river. x- 1 section and the first N +1 river section i Month j The comprehensive degradation coefficient of pollutants, 1 / s, is based on empirical values ​​of pollutant degradation coefficients from other rivers within the same water resource zone. and The current situation of a certain branch in the current year x- 1 section and the first N +1 river section i Average cross-sectional width per month, m 2 ; After the implementation of the designed annual water diversion project, during dry years, the reservoir on a certain tributary... x The first section of the river i Month j Concentration of pollutants entering the database The calculation method is as follows: x =1,2,3…… N In the formula, and For the dry year of a certain tributary after the implementation of the designed horizontal water diversion project x -1 river section and the N +1 river section i Monthly traffic, m 3 / s; and These are the results of the water diversion project implemented at the designed annual level, and the dry season of a certain tributary. x -1 river section and the N The first section of the river i Month j Concentration of the pollutant, mg / L; The design level is based on the implementation of a water diversion project, and the dry season is the first year at the end of a certain tributary. i Month j Concentration values ​​of various pollutants entering the storage, mg / L; After the implementation of the designed horizontal water diversion project, a certain branch of the project... x The first section of the river i Month j The amount of each pollutant entering the river, in g / s; After the implementation of the designed horizontal water diversion project, a certain branch of the project... x The first section of the river i Monthly wastewater discharge into the river, m 3 / s; and These are the first tributaries after the implementation of the designed annual water diversion project. x- 1 section and the first N +1 river section i Average cross-sectional width per month, m 2 .

6. The method for predicting pollutant reduction in a water diversion and regulation reservoir according to claim 5, characterized in that: In step 3, the pollutant inflow concentration at the end of a tributary of the reservoir and the allowable inflow concentration are calculated based on the current year and design level year pollutant inflow concentration values ​​at the end of the water diversion project in the dry year. i Month j The calculation methods for the reduction of various pollutants are as follows: In the formula, X ij,now1 and X ij,des1 These are the current year and design year based on the pollution carrying capacity, respectively, and the dry year after the implementation of the water diversion project, representing the first year of dry season in the land area of ​​the regulating reservoir. i Month j Pollutant reduction amount, g / s.

7. The method for predicting pollutant reduction in a water diversion and regulation reservoir according to claim 6, characterized in that: In step 4, a major tributary is divided along the direction of water flow into... N +1 river section, depending on the distribution of pollution sources within the catchment area. N For each river section, starting with the allowable concentration of a certain pollutant entering the reservoir, the allowable concentration of that pollutant at each node is calculated in reverse order. The calculation method for the allowable concentration of a certain pollutant in each section of a tributary during the current dry year is as follows: 0,1,2…… N -1 In the formula, , , These are, respectively, a node at the end of a tributary in the current year and the dry year, and the first... z The river section, the first z+ 1 section of the river i Month j Permissible concentration values ​​for each pollutant, mg / L; and These are the nodes at the end of a certain branch and the first... z The first section of the river i Month j The comprehensive degradation coefficient of the pollutants, 1 / s; and These are respectively the distance from the end of a branch to the previous node and the first z The length of each river segment, in meters; and These represent the current state of a certain tributary from its terminal point to the previous node and the first... z The first section of the river i Average cross-sectional width per month, m 2 ; and These represent the current year, the dry year, and the point from the end of a tributary to the previous node and the first... z The first section of the river i Average monthly flow, m 3 / s; The calculation method for the allowable concentration of a certain pollutant in each section of a tributary during a dry year after the implementation of the designed annual water diversion project is as follows: 0,1,2…… N -1 In the formula, , , These are, respectively, a node at the end of a tributary during a dry year after the implementation of the designed annual water diversion project; the first... z The river section, the first z+ 1 section of the river i Month j Permissible concentration values ​​for each pollutant, mg / L; and These represent the distance from the end of a tributary to the previous node and the first node after the implementation of the designed annual water diversion project. z The first section of the river i Average cross-sectional width per month, m 2 ; and These represent the distance from the end of a tributary to the previous node and the first node during a dry year after the implementation of the designed horizontal water diversion project. z The first section of the river i Average monthly flow, m 3 / s; Considering the water quality standards required for a certain river section, and comparing it with the first node... i Month j The difference between the permissible concentration and the calculated concentration of a pollutant, and the current situation at a certain node of a certain tributary during a dry year. i Month j The reduction amount of each pollutant is calculated as follows: In the formula, and These are the current year's dry year's source of a certain tributary and the first x The first section of the river i Month j Pollutant reduction amount, g / s; , and These are the current year's dry year's source of a certain tributary, the first x -1 river section, the x The first section of the river i Monthly traffic, m 3 / s; and These are the current year's dry year's source of a certain tributary and the first x The first section of the river i Month j Concentration of each pollutant, mg / L; and These are the current year's dry year's source of a certain tributary and the first x The first section of the river j Upper limit of concentration for each pollutant, mg / L; and These are the current year's dry year's source of a certain tributary and the first x The first section of the river i Month j Permissible concentration values ​​for each pollutant, mg / L; After the implementation of the designed annual water diversion project, during a dry year, at a certain node on a certain tributary... i Month j The reduction amount of each pollutant is calculated as follows: In the formula, and These are the source of a tributary and the first tributary after the implementation of the designed annual water diversion project. x The first section of the river i Month j Pollutant reduction amount, g / s; , and These are the headwaters of a tributary after the implementation of the designed annual water diversion project. x -1 river section, the x The first section of the river i Monthly traffic, m 3 / s; and These are the source of a tributary and the first tributary after the implementation of the designed annual water diversion project. x The first section of the river i Month j Concentration of the pollutant, mg / L; and These are the source of a tributary and the first tributary after the implementation of the designed annual water diversion project. x The first section of the river j Upper limit of concentration for each pollutant, mg / L; and These are the source of a tributary and the first tributary after the implementation of the designed annual water diversion project. x The first section of the river i Month j Permissible concentration values ​​for each pollutant, in mg / L.

8. The method for predicting pollutant reduction in a water diversion and regulation reservoir according to claim 7, characterized in that: In step 4, the water diversion project is implemented at the designed level for the following year. x The first section of the river i Month j The principle is that the amount of pollutants entering the river will not increase compared to the current situation. After the implementation of the designed annual water diversion project, at a certain node of a certain tributary during a dry year... i Month j The calculation methods for the reduction of various pollutants are as follows: In the formula, To ensure the implementation of the designed water diversion project in the first year x The first section of the river i Month j The design level of a certain tributary after the implementation of a water diversion project is calculated with the boundary condition that the amount of pollutants entering the river does not increase compared to the current situation. x The first section of the river i Month j Pollutant reduction amount, g / s; The final design level of a certain tributary water diversion project after its implementation. x The first section of the river i Month j Pollutant reduction amount, g / s.

9. The method for predicting pollutant reduction in a water diversion and regulation reservoir according to claim 8, characterized in that: In step 5, the method for determining the monthly pollutant reduction amount in the reservoir water area during the dry year after the implementation of the water diversion project in the current year and design level year is as follows: In the formula, and These are the current year and the design year, respectively, the dry year of the water diversion project after its implementation. i Month j Pollutant reduction amount, g / s; The design level for the annual water diversion project during the dry season. i Monthly Hydration Process (Step 1) j The amount of newly added pollutants, g / s; q is The first water diversion project designed for the dry year. i Monthly replenishment flow to the regulating reservoir, m 3 / s; The current annual water diversion project is located in the water source area of ​​the first i Month j Concentration of each pollutant, mg / L; The current annual regulating reservoir i Month j The concentration of each pollutant is expressed in mg / L; ∑ represents the sum of the reduction amounts of multiple tributaries flowing into the reservoir, in g / s.

10. A system for predicting pollutant reduction in water storage reservoirs of water diversion projects, characterized in that, include: Module 1. It is used to collect data on the inflow and outflow locations of water in the regulating reservoirs for current and design years, as well as the long-term monthly flow processes and pollutant inflow amounts in different sections of major tributaries; to collect monthly water quality monitoring data for the water source areas of water diversion projects, regulating reservoirs, and their major tributaries for the past three years, as well as shoreline data of regulating reservoirs and empirical values ​​of pollutant degradation coefficients for other rivers within the same water resource zone; and to monitor pollutant concentrations in different water areas at different time intervals, centered on the inflow points of major tributaries. Module 2. It is used to obtain the monthly monitoring values ​​of pollutant concentrations in the current year and the predicted values ​​of pollutant concentrations in the reservoir during the dry season of the design level year, and compare them with the upper limit of each pollutant concentration under the water quality management target, and calculate the monthly pollutant reduction amount of the reservoir during the dry season of the current year and the design level year. Module 3. It is used to calculate the pollutant carrying capacity and allowable inflow concentration of the regulating reservoir in the current year and the design level year based on the monthly flow process during the dry season in the current year and the design level year; based on the pollutant inflow of different sections of the main tributaries, it calculates the monthly pollutant concentration of different sections during the dry season in the current year and the design level year and determines the pollutant inflow concentration; it compares the monthly pollutant inflow concentration of the main tributaries of the regulating reservoir with the monthly allowable inflow concentration of pollutants; and calculates the amount of land-based pollutant reduction of the main tributaries after the implementation of the water diversion project in the current year and the design level year. Module 4. It is used to calculate the monthly allowable pollutant concentration in different river sections by using the monthly allowable inflow concentration of pollutants in the main tributaries of the regulating reservoir, compare the monthly pollutant concentration in different river sections with the monthly allowable pollutant concentration, and calculate the amount of land pollutant reduction in different river sections of the main tributaries in the current year and the design level year during the dry season. Module 5. It is used to calculate the monthly pollutant reduction in the water area of ​​the regulating reservoir during the current dry year; and to calculate the monthly pollutant reduction in the water area during the design dry year, based on the principle that the implementation of the water diversion project will not increase the pollutant load. The pollutant reduction prediction system for water diversion and regulation reservoirs is used to perform the steps in the pollutant reduction prediction method for water diversion and regulation reservoirs as described in any one of claims 1-9.

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