A method and system for predicting pollutant reduction of a water diversion project regulation reservoir

Abstract

The application discloses a kind of water diversion project water storage reservoir pollutant reduction amount prediction method and system, comprising the following steps: (1) collecting water source area of water diversion project, water storage reservoir and its main tributary water quality routine monitoring data and different river reach pollutant inflow, water storage reservoir shoreline data, reservoir inflow and outflow;(2) predict water quality condition of water storage reservoir, calculate water storage reservoir pollutant reduction amount;(3) calculate pollutant allowable concentration of main tributary estuary of water storage reservoir and inverse calculate pollutant allowable concentration of different river reaches, calculate the pollutant concentration of different river reaches, determine the land pollutant reduction amount of water storage reservoir and the land pollutant reduction amount of different river reaches of main tributary;(4) calculate water area pollutant reduction amount of water storage reservoir.The present application proposes water-land integrated pollutant reduction method, establishes water quality safety guarantee prediction system of water diversion project water storage reservoir, and provides systematic methodology for regional (basin) pollutant inflow reduction amount calculation.

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 generally consists of two parts, i.e. land exogenous pollutant input and water endogenous pollutant release. The reduction of land exogenous pollutant input is mainly realized through a series of engineering and non-engineering measures such as source reduction, process control and end reduction. The control of water endogenous pollutant release is mainly realized through measures such as water landscape construction and aquatic organism regulation. Among them, the control measures of water endogenous pollutant release generally have the characteristics of low cost and good landscape effect. Reasonable determination of the reduction amount of land and water pollutants 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 reduction target of land and water pollutants is borne by the land reduction measures. However, the existing pollutant reduction method system has the following shortcomings: 1. The reduction of land pollutant into the reservoir is taken as a whole for the rivers entering the reservoir, and the reduction target of land pollutant into the river for different river sections cannot be determined; 2. The reduction of land pollutant is mainly considered, and the requirement of water pollutant reduction target is ignored; 3. The water-land integrated pollutant reduction method system considering the pollutant reduction requirement of water supplement by the water diversion project has not been established. SUMMARY

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

[0006] Based on the above problems, the present application adopts the following technical scheme:

[0007] A method for predicting the reduction amount of pollutants in the reservoir of the water diversion project, comprising the following steps:

[0008] Step 1. Collect the water inflow and outflow positions of the reservoir in the present situation year and the design level year, the long series of monthly flow processes thereof, the pollutant inflow amount of different river sections of the main tributaries; 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 values of pollutant degradation coefficients of other rivers in the same water resource partition; monitor the pollutant concentrations in different time intervals and different water areas with the main tributary inflow point as the center;

[0009] Step 2. Obtain the monthly pollutant concentration monitoring values of the reservoir in the present situation year and the monthly pollutant concentration prediction values 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;

[0010] 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.

[0011] 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.

[0012] 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.

[0013] Furthermore, 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.

[0014] 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:

[0015]

[0016]

[0017] In the formula, The first reservoir to regulate water flow during the dry season after the implementation of the designed horizontal water diversion project. 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 first reservoir to regulate water flow during the dry season after the implementation of the designed horizontal water diversion project. i Monthly outflow rate, m 3 / s; The first reservoir to regulate water flow during the dry season after the implementation of the designed horizontal water diversion project. 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 The 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.

[0018] 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:

[0019]

[0020] 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 j The upper limit of the concentration of each pollutant, in mg / L.

[0021] 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 j The calculation method for the permissible concentration of pollutants entering the storage is as follows:

[0022]

[0023]

[0024] 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;

[0025] 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:

[0026]

[0027]

[0028] In the formula, The current annual dry season is the first year of water storage reservoir. i Monthly outflow rate, m 3 / s; The current annual dry season is the first year of water storage reservoir. i Monthly reservoir volume, m 3 ;

[0029] 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:

[0030]

[0031]

[0032] In the formula, The average water depth of the diffusion zone in the design level year after the implementation of the water diversion project, m i The average water depth of the diffusion zone in the design level year after the implementation of the water diversion project, m The diffusion angle of the diffusion zone in the design level year after the implementation of the water diversion project, rad i The diffusion angle of the diffusion zone in the design level year after the implementation of the water diversion project, rad and The radius of the diffusion zone with the end of the main branch as the center in the design level year after the implementation of the water diversion project, m i The radius of the diffusion zone with the end of the main branch as the center in the design level year after the implementation of the water diversion project, m

[0033] Further, in step 3, a certain main branch is divided into N +1 river sections along the water flow direction, and the pollution sources in the catchment area are distributed in the first N river sections, and the pollutant inflow into the river of the first N river sections is calculated respectively, and the concentration of the first x pollutant in the first j river section of a certain branch in the design level year after the implementation of the water diversion project and the concentration of the first j pollutant into the reservoir are calculated as follows:

[0034] x =1,2,3… N

[0035]

[0036] In the formula, and are the flow rates of the first x -1 river section and the first N +1 river section of a certain branch in the design level year, m 3 / s; i and are the concentrations of the first pollutant in the first x river section, the first x -1 river section and the first N river section of a certain branch in the design level year, mg / L; i is the concentration of the first j pollutant into the reservoir at the end of a certain branch in the design level year, mg / L; is the concentration of the first i pollutant into the reservoir at the end of a certain branch in the design level year, mg / L; j is the concentration of the first pollutant into the reservoir at the end of a certain branch in the design level year, mg / L; x is the concentration of the first i pollutant into the reservoir at the end of a certain branch in the design level year, mg / L; j is the concentration of the first pollutant into the reservoir at the end of a certain branch in the design level year, mg / L;x the length of the i th river section of a certain tributary i the monthly waste water discharge into the river, m 3 / s; the length of the i th river section of a certain tributary x the length of the i th river section of a certain tributary the length of the i th river section of a certain tributary N+ the length of the i th river section of a certain tributary and the length of the i th river section of a certain tributary x- the length of the i th river section of a certain tributary N the length of the i th river section of a certain tributary i the monthly concentration of the i th pollutant in the i th river section of a certain tributary j the monthly concentration of the i th pollutant in the i th river section of a certain tributary and the average cross-sectional width of the i th river section of a certain tributary x- the average cross-sectional width of the i th river section of a certain tributary N the average cross-sectional width of the i th river section of a certain tributary i the average cross-sectional width of the i th river section of a certain tributary 2 ;

[0037] the monthly concentration of the i th pollutant in the i th river section of a certain tributary x the monthly concentration of the i th pollutant in the i th river section of a certain tributary i the monthly concentration of the i th pollutant in the i th river section of a certain tributary j the monthly concentration of the i th pollutant in the i th river section of a certain tributary The calculation method is as follows:

[0038] x =1,2,3…… N

[0039]

[0040] In the formula, and the monthly concentration of the i th pollutant in the i th river section of a certain tributary x the monthly concentration of the i th pollutant in the i th river section of a certain tributary N the monthly concentration of the i th pollutant in the i th river section of a certain tributary i the monthly concentration of the i th pollutant in the i th river section of a certain tributary 3 / s; and the monthly concentration of the i th pollutant in the i th river section of a certain tributary x the monthly concentration of the i th pollutant in the i th river section of a certain tributary N the monthly concentration of the i th pollutant in the i th river section of a certain tributary i the monthly concentration of the i th pollutant in the i th river section of a certain tributary j the monthly concentration of the i th pollutant in the i th river section of a certain tributary the monthly concentration of the i th pollutant in the i th river section of a certain tributary i the monthly concentration of the i th pollutant in the i th river section of a certain tributary j the monthly concentration of the i th pollutant in the i th river section of a certain tributary 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 .

[0041] 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:

[0042]

[0043]

[0044] 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.

[0045] 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:

[0046]

[0047] 0,1,2…… N -1

[0048] 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;

[0049] 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:

[0050]

[0051] 0,1,2…… N -1

[0052] 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 first section of the river, 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;

[0053] 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:

[0054]

[0055]

[0056] 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;

[0057] 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:

[0058]

[0059] 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.

[0060] 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:

[0061]

[0062]

[0063] 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 Monthj 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.

[0064] 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:

[0065]

[0066]

[0067]

[0068] 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.

[0069] On the other hand, the present invention provides a system for predicting the pollutant reduction of water diversion and regulation reservoirs, comprising:

[0070] 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.

[0071] Module II. It is used to obtain the monthly concentration monitoring values of pollutants in the reservoir in the current year and the predicted values of pollutants in the reservoir in the dry year of the design level year, and compare them with the upper limit of the concentration of each pollutant under the water quality management target, to calculate the monthly pollutant reduction amount of the reservoir in the current year and the dry year of the design level year;

[0072] Module III. It is used to calculate the pollutant carrying capacity and allowable concentration of the reservoir in the current year and the dry year of the design level year according to the monthly flow process of the reservoir in the current year and the dry year of the design level year, respectively; the monthly concentration of pollutants in different river reaches in the current year and the dry year of the design level year is calculated according to the pollutant inflow amount of the main tributaries in different river reaches, and the pollutant inflow concentration is determined; the monthly inflow concentration of pollutants in the main tributaries of the reservoir is compared with the monthly allowable inflow concentration of pollutants, and the land pollutant reduction amount of the main tributaries in the dry year after the implementation of the water diversion project in the current year and the dry year of the design level year is calculated;

[0073] Module IV. It is used to calculate the monthly allowable concentration of pollutants in different river reaches by inversely calculating the monthly allowable concentration of pollutants in the main tributaries of the reservoir, and the land pollutant reduction amount of different river reaches in the main tributaries in the current year and the dry year of the design level year is calculated by comparing the difference between the monthly concentration of pollutants in different river reaches and the monthly allowable concentration of pollutants.

[0074] Module V. It is used to calculate the monthly pollutant reduction amount of the reservoir in the current year and the dry year; and the monthly pollutant reduction amount of the reservoir in the dry year of the design level year is calculated based on the principle that the implementation of the water diversion project does not increase the pollutant load.

[0075] Compared with the prior art, the present application has the following beneficial effects:

[0076] 1) The allowable concentration of pollutants at the end of the inflow river (at the reservoir) is determined by the water pollution carrying capacity, the allowable concentration of pollutants in different river reaches of the inflow river at different periods is calculated by comparing the upper limit of the water quality management target concentration, and the pollutant inflow reduction amount in different river reaches at different periods is calculated according to the difference between the pollutant concentration and the allowable concentration of pollutants and the flow of the river. Compared with the prior art, the present application optimizes and adjusts the traditional reservoir pollutant inflow reduction amount from the end of the inflow river (at the reservoir) to the value in different river reaches of the inflow river at different periods, which is more conducive to guiding the formulation of pollutant inflow reduction schemes in different regions at different periods.

[0077] 2) The difference between the pollutant reduction amount of the reservoir and the sum of the pollutant reduction amounts of the end of each river (the place where the reservoir is located) is determined to determine the pollutant reduction amount of the reservoir area at different periods before and after the implementation of the water diversion project. Compared with the prior art, the pollutant reduction amount of the traditional reservoir is expanded from a single land pollutant reduction mode to a land and water pollutant reduction mode, which can avoid the problem of excessive investment and resource waste caused by the fact that the land and water pollutant reduction target is entirely borne by the land reduction measures.

[0078] 3) Considering the pollutant reduction requirement of the water diversion project, a water and land coordinated pollutant reduction method for different scenarios before and after the implementation of the water diversion project is proposed, and a water quality safety guarantee prediction system for the reservoir of the water diversion project is established, which provides a systematic, novel and applicable methodology for the calculation of the pollutant reduction amount of the region (watershed) into the river. BRIEF DESCRIPTION OF DRAWINGS

[0079] Figure 1 The present application is a pollutant reduction amount prediction flowchart for the reservoir of the water diversion project.

[0080] Figure 2 The present application is a pollutant reduction amount calculation flowchart for the reservoir.

[0081] Figure 3 The present application is a land pollutant reduction amount calculation flowchart for the reservoir.

[0082] Figure 4 The present application is a land pollutant reduction amount calculation flowchart for the main tributaries of the reservoir.

[0083] Figure 5 The present application is a water pollutant reduction amount calculation flowchart for the reservoir. DETAILED DESCRIPTION

[0084] In order to facilitate those skilled in the art to understand and implement the present application, the present application will be further described in detail below in conjunction with the drawings and examples. It should be understood that the implementation examples described herein are only for illustration and explanation of the present application, and are not intended to limit the present application.

[0085] In view of the fact that the existing pollutant reduction method system cannot clearly define the land pollutant reduction target of different river sections and ignores the water pollutant reduction target requirement, a water and land coordinated pollutant reduction method system considering the pollutant reduction requirement of the water diversion project is first established, a pollutant reduction amount prediction method and system for the reservoir of the water diversion project are proposed, the pollutant reduction amount of the reservoir, the land pollutant reduction amount and the newly added pollutant amount of the water diversion project are calculated by taking the allowable concentration value of the pollutant of the main tributaries of the reservoir as the link, the water pollutant reduction amount of the reservoir is calculated, and the pollutant reduction amount of the main tributaries of the reservoir is determined, thereby perfecting the pollutant reduction method system for the lake and reservoir.

[0086] The present application predicts the water quality condition of the reservoir after the implementation of the water diversion project in the design level year by collecting the routine monitoring data of the water quality of the water source area of the water diversion project in the current year, the reservoir and its main tributaries, the reservoir inflow and outflow data in the current year and the design level year after the implementation of the water diversion project, and the pollutant inflow of the main tributaries in different river sections, taking the water quality target requirement as the constraint, calculating the pollutant reduction amount of the reservoir in the current year and the design level year after the implementation of the project; secondly, the pollutant carrying capacity of the estuary area of the main tributaries in the current year and the design level year after the implementation of the project is calculated, and the allowable concentration of pollutants in the estuary of the tributaries and the allowable concentration of pollutants in different river sections are determined, the pollutant concentration in different river sections is calculated combined with the pollution source investigation results, and the main inflow river land pollutant inflow reduction amount is determined by comparing the allowable concentration of pollutants in the estuary of the tributaries, and the main inflow river land pollutant reduction amount in different river sections is determined by comparing the allowable concentration of pollutants in different river sections; finally, the pollutant reduction amount of the reservoir and the main pollutant inflow reduction amount of the tributaries are considered, and the principle of not increasing the pollutant load after the implementation of the water diversion project is considered, and the pollutant reduction amount of the reservoir water area in the current year and the design level year after the implementation of the water diversion project is calculated.

[0087] Example 1

[0088] The present application is applicable to the EB water resources allocation project (hereinafter referred to as "EB project") reservoir water quality safety guarantee prediction, and the present application is applicable to the EB project reservoir water quality safety guarantee prediction.

[0089] The EB project takes the DC reservoir as the water source, the starting point is located in front of the DC reservoir dam, the water diversion line is about 270km long from northwest to southeast through the EB land, and the receiving area is about 10,000km 2 . In order to ensure the flexibility of water resources allocation, the FC reservoir, a large reservoir located in the middle and lower reaches of the water diversion line, is set as an online regulation reservoir. The FC reservoir dam controls a basin area of 460km 2 . The average annual temperature of the basin is 15.7℃, the average annual precipitation is 958mm, and the average annual precipitation during the flood season or irrigation period (May to September) is 675mm; the average annual runoff is 172 million m 3 , of which the average annual runoff during the flood season or irrigation period is 121 million m 3 . The FC reservoir has a multi-year regulation performance, and the normal storage level is 124.0m; the total reservoir capacity is 265 million m 3 , of which the useful reservoir capacity is 137 million m 3 , the dead reservoir capacity is 55.8 million m 3 , the hydraulic retention time is about 407 days, and the water exchange capacity is weak. The FC reservoir is a river type reservoir with a water surface area of 20.14km2 The average water surface width is 500 m, and it involves main rivers such as A, B and C, and B is the main stream of the FC reservoir. The FC reservoir is an important online regulating reservoir of the EB project. The EB project takes the right dam shoulder of the FC reservoir as the water supplement point, and takes the left dam shoulder of the FC reservoir as the starting point of the water conveying tunnel, so as to realize the goal of water supplement to the water receiving area. Figure 1

[0090] In this embodiment, the second scale is converted into the month scale by time conversion, which mainly includes the following steps:

[0091] Step 1. Collect the water inflow and outflow position of the present year and the design level year, the long series of monthly flow process of the reservoir, the pollutant inflow of the main tributaries in different river sections, respectively; collect the monthly water quality monitoring data of the water source area of the diversion and regulation project, the reservoir and its main tributaries in the past three years, the shoreline data of the reservoir, 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 with the main tributary inflow point as the center.

[0092] Table 1 Total phosphorus inflow of different river sections in the present year Unit: t

[0093]

[0094] Table 2 Total phosphorus inflow of different river sections after the implementation of the design level year diversion and regulation project Unit: t

[0095]

[0096] Step 2. Obtain the monthly concentration monitoring value of the pollutant of the reservoir in the present year and the monthly concentration prediction value of the pollutant of the reservoir in the design level year dry year, and compare them with the upper limit of the concentration of each pollutant under the water quality management target, respectively, to calculate the monthly pollutant reduction amount of the reservoir in the present year and the design level year dry year.

[0097] Table 3 Monthly inflow of the reservoir in the present year dry year calculated from the long series of data

[0098]

[0099] Table 4 Monthly average total phosphorus monitoring data of the water source area of the diversion and regulation project, the reservoir and its main tributaries in the present three years Unit: mg / L

[0100]

[0101] Table 5 Monthly total phosphorus reduction amount of the reservoir in the present year dry year Unit: t

[0102]

[0103] ​Table 6 Monthly inflow and outflow of the reservoir in the dry season of the design level year after the implementation of the water diversion project Unit: m 3 / s

[0104]

[0105] Table 7 Total phosphorus concentration of the reservoir in the dry season of the design level year after the implementation of the water diversion project Unit: mg / L

[0106]

[0107] Table 8 Total phosphorus reduction of the reservoir in the dry season of the design level year after the implementation of the water diversion project Unit: t

[0108]

[0109] Step 3. According to the monthly flow process of the current year and the design level year in the dry season, the pollutant carrying capacity and the allowable inflow concentration of the reservoir in the current year and the design level year are calculated respectively. According to the pollutant inflow of different river sections of the main tributary, the monthly concentration of pollutants in different river sections in the current year and the design level year in the dry season is calculated respectively, and the pollutant inflow concentration is determined. By comparing the monthly inflow concentration of pollutants in the main tributary of the reservoir with the monthly allowable inflow concentration of pollutants, the reduction of land pollutants in the main tributary in the dry season of the current year and the design level year after the implementation of the water diversion project is calculated.

[0110] Table 9 Monthly pollutant carrying capacity of the reservoir in the dry season of the current year Unit: t

[0111]

[0112] Table 10 Monthly allowable inflow concentration of total phosphorus of the reservoir in the dry season of the current year Unit: mg / L

[0113]

[0114] Table 11 Monthly pollutant carrying capacity of the reservoir in the dry season of the design level year after the implementation of the water diversion project Unit: t

[0115]

[0116] Table 12 Monthly allowable inflow concentration of total phosphorus of the reservoir in the dry season of the design level year after the implementation of the water diversion project Unit: mg / L

[0117]

[0118] Table 13 Total phosphorus concentration and inflow concentration of different river sections in the dry season of the current year Unit: mg / L

[0119]

[0120] Table 14 Total phosphorus concentration and its concentration into river after implementation of the design level year water diversion project; unit: mg / L

[0121]

[0122] Table 15 Monthly land total phosphorus reduction into reservoir in the current year dry season; unit: t

[0123]

[0124] Table 16 Monthly land total phosphorus reduction into reservoir in the design level year dry season; unit: t

[0125]

[0126] Step 4. The monthly allowable concentration of pollutants into reservoir in the main tributaries is calculated by the monthly allowable concentration of pollutants into reservoir in the main tributaries, and the difference between the monthly concentration of pollutants and the monthly allowable concentration of pollutants in different river sections is compared, and the land pollutant reduction in different river sections in the main tributaries in the current year and the design level year dry season is calculated.

[0127] Table 17 Allowable concentration of total phosphorus in different river sections of reservoir tributaries in the current year dry season; unit: mg / L

[0128]

[0129] Table 18 Monthly land total phosphorus reduction into reservoir in different river sections of reservoir tributaries in the current year dry season; unit: t

[0130]

[0131] Table 19 Allowable concentration of total phosphorus in different river sections of reservoir tributaries in the design level year dry season after implementation of the project; unit: mg / L

[0132]

[0133] Table 20 Monthly land total phosphorus reduction in different river sections of reservoir tributaries in the design level year dry season after implementation of the project; unit: t

[0134]

[0135] Step 5. Calculate the monthly pollutant reduction in the water area of the reservoir in the current year dry season; calculate the monthly pollutant reduction in the water area of the reservoir in the design level year dry season according to the principle that the implementation of the water diversion project does not increase the pollutant load.

[0136] Table 21 Monthly total phosphorus reduction in the water area of the reservoir in the current year dry season; unit: t

[0137]

[0138] Table 22: New pollution amount of the water diversion project in the dry year after the implementation of the design level year

[0139]

[0140] Table 23: Total phosphorus pollution reduction amount of the water storage reservoir in the dry year after the implementation of the water diversion project in the design level year

[0141]

[0142] Example 2

[0143] The embodiment provides a water diversion project water storage reservoir pollution reduction amount prediction system, which comprises:

[0144] Module I. It is used for collecting the water inflow and outflow position of the water storage reservoir in the current year and the design level year, the long series monthly flow process of the water storage reservoir, the pollution inflow amount of the main tributary in different river sections, respectively; collecting the monthly water quality monitoring data of the water source area of the water diversion project, the water storage reservoir and the main tributary in the past three years, the shoreline data of the water storage reservoir, the empirical value of the pollution degradation coefficient of other rivers in the same water resource partition; monitoring the pollution concentration in different water areas with the main tributary inflow point as the center at different time intervals;

[0145] Module II. It is used for obtaining the monthly pollution concentration monitoring value of the water storage reservoir in the current year and the monthly pollution concentration prediction value of the water storage reservoir in the dry year of the design level year, and comparing the monthly pollution concentration prediction value with the upper limit of the pollution concentration under the water quality management target, respectively, to calculate the monthly pollution reduction amount of the water storage reservoir in the current year and the dry year of the design level year;

[0146] Module III. It is used for calculating the pollution carrying capacity and the allowable inflow concentration of the water storage reservoir in the current year and the design level year according to the monthly flow process in the current year and the design level year, respectively; calculating the monthly concentration of the pollution in different river sections in the current year and the dry year of the design level year according to the pollution inflow amount of the main tributary in different river sections, and determining the inflow concentration of the pollution, comparing the monthly inflow concentration of the pollution in the main tributary of the water storage reservoir with the monthly allowable inflow concentration of the pollution, and calculating the land pollution reduction amount of the main tributary in the dry year after the implementation of the water diversion project in the current year and the design level year;

[0147] Module IV. It is used for inversely calculating the monthly allowable concentration of the pollution in different river sections through the monthly allowable inflow concentration of the pollution in the main tributary of the water storage reservoir, comparing the difference between the monthly concentration of the pollution in different river sections and the monthly allowable concentration of the pollution, and calculating the land pollution reduction amount of the main tributary in different river sections in the current year and the dry year of the design level year;

[0148] Module five. It is used for calculating the monthly pollutant reduction of the water area of the reservoir in the current dry year; and the monthly pollutant reduction of the water area of the reservoir in the design dry year is calculated according to the principle of not increasing the pollutant load in the implementation of the water diversion project.

[0149] The above description is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application.

[0150] It should be understood that the parts not elaborated in the specification are all prior art.

[0151] It should be understood that the above description of the preferred embodiments is more detailed, and therefore should not be considered as a limitation on the scope of patent protection of the present application. Ordinary skilled persons in the art can make substitutions or modifications without departing from the scope of protection claimed by the present application, which falls within the scope of protection of the present application. The scope of protection claimed by the present application should be subject to the appended claims.

Claims

1. A method for predicting pollutant reduction amount of a water storage reservoir of a water diversion project, characterized in that, Comprising the following steps: Step 1. Collect the water inflow and outflow locations of the reservoir in the current year and the design level year, the long series of monthly flow processes, and the pollutant inflow of different river sections of the main tributaries, respectively; collect the monthly water quality monitoring data of the water source area of the diversion and regulation project, the reservoir and its main tributaries in the past three years, the shoreline data of the reservoir, and the empirical values of pollutant degradation coefficients of other rivers in the same water resources partition; monitor the pollutant concentrations in different water areas with different time intervals and different centers of the main tributary inflow points; Step 2. Obtain the monthly pollutant concentration monitoring values of the reservoir in the current year and the predicted values of the monthly pollutant concentration of the reservoir in the design level year and the dry year, and compare them with the upper limit of each pollutant concentration under the water quality management target, respectively, to calculate the monthly pollutant reduction amount of the reservoir in the current year and the dry year in the design level year; the dry year is the year corresponding to the 90% guaranteed annual flow obtained by sorting the long series of inflow flows after the implementation of the diversion and regulation project in the current year or the design level year; The designed water level of the reservoir in the dry year after the implementation of the annual water diversion project is i The designed water level of the reservoir in the dry year after the implementation of the annual water diversion project is j The pollutant concentration prediction method is as follows: wherein, is the inflow of the reservoir in the nth month of the dry year after the implementation of the water diversion project in the design level year, m i is the concentration of the nth pollutant in the reservoir in the nth month of the dry year after the implementation of the water diversion project in the design level year, mg / L; j is the concentration of the nth pollutant in the reservoir in the nth month of the dry year after the implementation of the water diversion project in the design level year, mg / L; q i,des is the inflow of the reservoir in the nth month of the dry year after the implementation of the water diversion project in the design level year, m i is the inflow of the reservoir in the nth month of the dry year after the implementation of the water diversion project in the design level year, m 3 / s; is the concentration of the nth pollutant in the reservoir in the nth month of the dry year after the implementation of the water diversion project in the design level year, mg / L; i is the concentration of the nth pollutant in the reservoir in the nth month of the dry year after the implementation of the water diversion project in the design level year, mg / L; j is the concentration of the nth pollutant in the reservoir in the nth month of the dry year after the implementation of the water diversion project in the design level year, mg / L; is the outflow of the reservoir in the nth month of the dry year after the implementation of the water diversion project in the design level year, m i is the outflow of the reservoir in the nth month of the dry year after the implementation of the water diversion project in the design level year, m 3 / s; is the volume of the reservoir in the nth month of the dry year after the implementation of the water diversion project in the design level year, m i is the volume of the reservoir in the nth month of the dry year after the implementation of the water diversion project in the design level year, m 3 ; is the full mixing time of the reservoir in the dry year after the implementation of the water diversion project in the design level year, s; is the concentration of the nth pollutant in the reservoir in the nth month of the dry year, mg / L; i is the concentration of the nth pollutant in the reservoir in the nth month of the dry year, mg / L; j is the concentration of the nth pollutant in the reservoir in the nth month of the dry year, mg / L; and are the comprehensive degradation coefficients of the nth pollutant in the reservoir in the nth month of the dry year after the implementation of the water diversion project in the design level year and the present situation year, respectively, 1 / s; i and j are the comprehensive degradation coefficients of the nth pollutant in the reservoir in the nth month of the dry year after the implementation of the water diversion project in the design level year and the present situation year, respectively, 1 / s; is the inflow of the reservoir in the nth month of the dry year, m i is the inflow of the reservoir in the nth month of the dry year, m 3 / s; is the average water depth of the diffusion zone in the nth month of the dry year, m; i is the average water depth of the diffusion zone in the nth month of the dry year, m; is the diffusion angle of the diffusion zone in the nth month of the dry year, rad; i is the diffusion angle of the diffusion zone in the nth month of the dry year, rad; and are the concentrations of the same pollutant when the radius of the diffusion zone is and are the concentrations of the same pollutant when the radius of the diffusion zone is and are the concentrations of the same pollutant when the radius of the diffusion zone is Step 3. According to the monthly flow processes in the current year and the dry year in the design level year, respectively, calculate the pollutant carrying capacity and the allowable inflow concentration of the reservoir in the current year and the design level year; according to the pollutant inflow of different river sections of the main tributaries, calculate the monthly pollutant concentration of different river sections in the current year and the dry year in the design level year and determine the pollutant inflow concentration, compare the monthly pollutant inflow concentration of the main tributaries of the reservoir with the monthly allowable inflow concentration of the pollutant, and calculate the land pollutant reduction amount of the main tributaries in the dry year after the implementation of the diversion and regulation project in the current year and the design level year; Step 4. Calculate the monthly pollutant allowable concentration of different river sections by inversely calculating the monthly pollutant allowable concentration of the main tributaries of the reservoir, compare the difference between the monthly pollutant concentration of different river sections and the monthly pollutant allowable concentration, and calculate the land pollutant reduction amount of different river sections of the main tributaries in the current year and the dry year in the design level year; Step 5. Calculate the monthly pollutant reduction amount of the reservoir water area in the current year dry year; based on the principle that the implementation of the diversion and regulation project does not increase the pollutant load, calculate the monthly pollutant reduction amount of the water area in the dry year in the design level year.

2. The method according to claim 1, wherein the method is characterized by: The pollutant reduction amount calculation method is as follows: the monitoring value and the predicted value of the pollutant concentration of the reservoir in the dry year after the implementation of the water diversion project are calculated according to the current year and the design level year. i month j The pollutant reduction amount calculation method is as follows: the monitoring value and the predicted value of the pollutant concentration of the reservoir in the dry year after the implementation of the water diversion project are calculated according to the current year and the design level year. wherein X ij,now0 and X ij,des0 is the water quality target-based current year and design level year water diversion project implementation after the dry year of the i month of the j pollutant reduction amount, g / s; c s,j is the upper limit value of the concentration of the j pollutant under the water quality management target of the storage reservoir, mg / L.

3. The method according to claim 2, wherein the method is characterized by: In step 3, the present year and the design level year are introduced to the reservoir in the dry year after the implementation of the water diversion project i month j The calculation method of the allowable reservoir concentration of a pollutant 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 or medium-sized reservoir, the regulating reservoir in the dry year after the implementation of the water diversion project in the current year and the design level year i month j The pollutant carrying capacity calculation method of the pollutant is as follows: In the formula, is the reservoir storage volume in the current year's dry year in the month of i is the outflow flow in the current year's dry year in the month of 3 / s; is the reservoir storage volume in the current year's dry year in the month of i is the outflow flow in the current year's dry year in the month of 3 ; When the regulating reservoir is a large reservoir, the calculation method of the pollutant carrying capacity of a main tributary of the reservoir in the dry season in the current year and the design level year after the implementation of the water diversion project is as follows: i j The calculation method of the pollutant carrying capacity of a main tributary of the reservoir in the dry season in the current year and the design level year after the implementation of the water diversion project 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.

4. The method according to claim 3, wherein the method is characterized by: In step 3, a certain main tributary is divided into N +1 reaches along the water flow direction, and the pollution sources in the catchment area are distributed in the former N reaches. The pollutant inflow of the former N reaches is calculated respectively according to the distribution of pollution sources. The concentration of the x th pollutant in the j th reach of a tributary and the concentration of the j th pollutant into the reservoir in the current year are calculated 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 first 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 first section of the river, x -1 river section and the first 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 ; The design of the water transfer project in the dry year is to store water in the reservoir in the first month of the dry year x for the first river section of a branch i of the reservoir j to reduce the concentration of pollutants in the reservoir 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 first 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 first 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 .

5. The method of claim 4, wherein the method is characterized by: In step 3, the pollutant concentration value of a certain branch end of the reservoir in the dry year after the implementation of the water diversion project is calculated from the current year and the design level year, and the pollutant concentration value allowed to enter the reservoir is calculated to obtain the pollutant reduction amount of the land area of the reservoir in the dry year i month j The calculation method of the pollutant reduction amount is as follows: wherein X ij,now1 and X ij,des1 are the land area of the reservoir in the dry year after the implementation of the water diversion project based on the current year and the design level year of the water diversion project, respectively i month j pollutant reduction, g / s.

6. The method according to claim 5, wherein: In step 4, a certain main tributary is divided into N +1 reaches along the water flow direction, and the pollution sources in the catchment area are distributed in the former N reaches. The allowable concentration of a certain pollutant into the reservoir is the starting concentration, and the allowable concentration of the certain pollutant at each node is calculated in reverse. The calculation method of the allowable concentration of a certain pollutant in each reach of a tributary in the dry year of the present situation 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 first section of the river, 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 of the allowable concentration of a pollutant in each river section of a tributary in the dry year after the implementation of the diversion and regulation project in the design level year 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 first section of the river, 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; The pollutant reduction amount of a certain node of a certain branch in a dry year after the implementation of the designed annual water diversion project is calculated according to the following method: i month j ​ 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.

7. The method according to claim 6, wherein the method is characterized by: 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, the 1st month of the design level year after the implementation of the water diversion and regulation project in the certain branch river x the 1st month of the design level year after the implementation of the water diversion and regulation project in the certain branch river i the 1st month of the design level year after the implementation of the water diversion and regulation project in the certain branch river j the 1st month of the design level year after the implementation of the water diversion and regulation project in the certain branch river x the 1st month of the design level year after the implementation of the water diversion and regulation project in the certain branch river i the 1st month of the design level year after the implementation of the water diversion and regulation project in the certain branch river j the 1st month of the design level year after the implementation of the water diversion and regulation project in the certain branch river the 1st month of the design level year after the implementation of the water diversion and regulation project in the certain branch river x the 1st month of the design level year after the implementation of the water diversion and regulation project in the certain branch river i the 1st month of the design level year after the implementation of the water diversion and regulation project in the certain branch river j the 1st month of the design level year after the implementation of the water diversion and regulation project in the certain branch river 8. The method according to claim 7, wherein the method is characterized by: In step 5, the determination method of the monthly pollutant reduction amount of the reservoir water area in the dry year after the implementation of the diversion and regulation project in the current year and the 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.

9. A system for predicting pollutant reduction amount of a water storage reservoir of a water diversion project, characterized by, Comprising: Module one. It is used to collect the water inflow and outflow locations of the reservoir in the current year and the design level year, the long series of monthly flow processes, and the pollutant inflow of different river sections of the main tributaries, respectively; collect the monthly water quality monitoring data of the water source area of the diversion and regulation project, the reservoir and its main tributaries in the past three years, the shoreline data of the reservoir, and the empirical values of pollutant degradation coefficients of other rivers in the same water resources partition; monitor the pollutant concentrations in different water areas with different time intervals and different centers of the main tributary inflow points; Module II. It is used to obtain the monthly concentration monitoring values of pollutants in the reservoir in the current year and the predicted values of pollutants in the reservoir in the dry year of the design level year, and compare them with the upper limit of the concentration of each pollutant under the water quality management target, to calculate the monthly pollutant reduction amount of the reservoir in the current year and the dry year of the design level year; Module III. It is used to calculate the pollutant carrying capacity and allowable concentration of the reservoir in the current year and the dry year of the design level year according to the monthly flow process of the reservoir in the current year and the dry year of the design level year, respectively; according to the pollutant inflow amount of different river sections of the main tributary, the monthly concentration of pollutants in different river sections in the current year and the dry year of the design level year is calculated, and the pollutant inflow concentration is determined; the monthly inflow concentration of pollutants in the main tributary of the reservoir is compared with the monthly allowable inflow concentration of pollutants, and the land pollutant reduction amount of the main tributary in the dry year after the implementation of the water diversion project in the current year and the dry year of the design level year is calculated; Module IV. It is used to calculate the monthly allowable concentration of pollutants in different river sections by inversely calculating the monthly allowable concentration of pollutants in the main tributary of the reservoir, and to calculate the land pollutant reduction amount of different river sections in the main tributary in the current year and the dry year of the design level year by comparing the difference between the monthly concentration of pollutants in different river sections and the monthly allowable concentration of pollutants; Module V. It is used to calculate the monthly pollutant reduction amount of the reservoir in the current year and the dry year; and to calculate the monthly pollutant reduction amount of the reservoir in the dry year of the design level year based on the principle that the implementation of the water diversion project does not increase the pollutant load; The pollutant reduction prediction system of the reservoir of the water diversion project is used to perform the steps in the pollutant reduction prediction method of the reservoir of the water diversion project according to any one of claims 1-8.

Images