CN111898273A - River water environment capacity determination method based on water quality target of water functional area - Google Patents
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Abstract
The invention relates to a river water environment capacity determining method based on water quality target of a water functional area, which uses a computer to determine the catchment range of a river in the water functional area; obtaining the recent water quality change trend of each river; constructing a pollution source optimized water quality numerical model according to the pollution source response parameters and the current risk controllable capacity of the scattered stain discharge points; and determining the maximum allowable discharge capacity of the dispersed draining spots according to the current risk controllable capacity of the dispersed draining spots by taking whether the pollution source optimized water quality numerical model has the optimal solution as a judgment basis. The method is simple and high in precision, and the allowable sewage discharge capacity of the water environment of each drainage point of the river can be determined and considered.
Description
Technical Field
The invention belongs to the technical field of water environment management, and particularly relates to a river water environment capacity determination method based on a water quality target of a water functional area.
Background
At present, the calculation method of the water environment capacity mainly comprises two main categories of a deterministic method and an uncertain method.
The deterministic method mainly uses a mechanical water quality model as a main tool and mainly comprises an analytical formula method, a model trial and error method and a simulation optimization method, uncertain factors are introduced through restrictive conditions, the requirements on safety and control risk are expressed, and a calculation result is a fixed value. The analytical formula method adopts a steady-state water quality model for direct calculation, has small workload and the widest application, but has lower precision and can not be used for calculating the dynamic water environment capacity. The model trial and error method adopts a dynamic water quality model to repeatedly measure and calculate, has high calculation precision, but has relatively low calculation efficiency. The simulation optimization method based on the planning theory organically combines the simulation method with the optimization method, is flexible, can greatly improve the efficiency and the precision, but has almost the synonym of the concepts of the capacity and the total amount, is different from the connotation of the domestic water environment capacity, and emphasizes the total pollutant distribution.
The uncertainty method analyzes and calculates the water environment capacity or the value range of the capacity under a certain credibility level from the uncertainty angle, wherein the water quality random process method based on a deterministic model, the random differential equation model method and the grey (parameter) water quality planning method are not widely applied due to the limitation of interval value taking on distribution, the complexity of mathematical processing and the like.
Disclosure of Invention
The invention aims to provide a method which is simple in calculation and high in precision and can distribute pollutant discharge to scattered pollution discharge points. The specific technical scheme is as follows:
a river water environment capacity determination method based on water quality targets of a water functional area comprises the following steps:
(1) determining a river catchment range in a water functional area by a computer by utilizing a method of combining ArcGIS software and actual river data of GPS positioning correction;
(2) collecting water quality monitoring data of the river in recent years, evaluating the water quality of the river in the water functional area by adopting a comprehensive pollution index method, and analyzing the water quality according to the current situation of the river; performing trend analysis on the water quality by adopting the spearman rank correlation coefficient to obtain the recent water quality change trend of each river;
(3) acquiring pollution source response parameters, wherein the pollution source response parameters comprise the discharge capacity of each index pollutant of a drainage basin, the positions of dispersed discharge points in the drainage basin and the discharge capacity in a metering period, and the discharge position, the discharge capacity of the pollutant and the pollutant type of a pollution source; the pollutants comprise COD and NH3-N and TP water quality indicators;
(4) constructing a pollution source optimized water quality numerical model according to the pollution source response parameters and the current risk controllable capacity of the scattered stain discharge points;
(5) and determining the maximum allowable discharge capacity of the dispersed draining spots according to the current risk controllable capacity of the dispersed draining spots by taking whether the pollution source optimized water quality numerical model has the optimal solution as a judgment basis.
The pollution source optimized water quality numerical model in the step (4) comprises the following steps: an objective function and a constraint;
the objective function is the self-cleaning capacity of the drainage basin;
the constraints comprise basin ecological function constraints, pollution source pollution discharge total quantity constraints, pollution source pollution discharge demand constraints and basin environment safety constraints.
Step (5), comprising the following substeps:
(5.1) solving the pollution source optimized water quality numerical model;
(5.2) if the pollution source optimized water quality numerical model has the optimal solution, adjusting the current allowable capacity of the dispersed drainage spots to the current risk controllable capacity of the dispersed drainage spots;
(5.3) if the absolute value of the difference between the adjusted allowable capacity and the allowable capacity before adjustment is less than or equal to the preset safety threshold, determining the adjusted allowable capacity as the maximum allowable discharge capacity of the scattered dirt discharge points.
The step (5) further comprises the following substeps:
(5.4) if the absolute value of the difference value between the adjusted allowable capacity and the allowable capacity before adjustment is larger than the preset safety threshold, adjusting the current risk controllable capacity of the dispersed dirt discharge points according to the adjusted allowable capacity and the current unallowed capacity of the dispersed dirt discharge points;
and (5.5) constructing a pollution source optimized water quality numerical model according to the pollution source response parameters and the current risk controllable capacity of the scattered pollution discharging points.
The step (5) further comprises the following substeps:
(5.6) if the pollution source optimized water quality numerical model does not have the optimal solution, adjusting the current unallowable capacity of the dispersed drainage spots to the current risk controllable capacity of the dispersed drainage spots;
and (5.7) adjusting the current risk controllable capacity of the dispersed draining spots according to the adjusted unallowable capacity and the current allowable capacity of the dispersed draining spots, and then constructing a pollution source optimized water quality numerical model according to the pollution source response parameters and the current risk controllable capacity of the dispersed draining spots.
The step (5) further comprises the following substeps:
(5.8) calculating the mean value of the adjusted allowable capacity and the current unallowed capacity of the dispersed taint discharge point as a primary mean value, and adjusting the current risk controllable capacity of the dispersed taint discharge point to be the primary mean value;
(5.9) said adjusting the current risk controllable capacity of the dispersed spotting points according to the adjusted disallowed capacity and the current allowed capacity of the dispersed spotting points, comprising: and calculating the average value of the adjusted unallowable capacity and the current allowable capacity of the scattered dirt discharge points as a secondary average value, and adjusting the current risk controllable capacity of the scattered dirt discharge points to the secondary average value.
The invention has the following advantages:
according to the river water environment capacity determination method based on the water quality target of the water functional area, provided by the invention, a pollution source optimized water quality numerical model can be constructed according to the response parameters of the pollution source and the current risk controllable capacity of the dispersed drainage spots, and then whether the pollution source optimized water quality numerical model has an optimal solution or not is taken as a judgment basis, and the maximum allowable drainage capacity of the dispersed drainage spots is determined according to the current risk controllable capacity of the dispersed drainage spots.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples, but the scope of the present invention is not limited thereto.
Firstly, establishing a complete river water environment capacity management system, which comprises a parameter acquisition module, a model construction module and an allowable discharge capacity determination module;
the parameter acquisition module is used for acquiring pollution source response parameters, wherein the pollution source response parameters comprise the discharge capacity of each index pollutant of the drainage basin, the positions of the dispersed discharge points in the drainage basin and the discharge capacity in the metering period, and the discharge position, the discharge capacity of the pollutant and the pollutant type of the pollution source;
the model construction module is used for constructing a pollution source optimized water quality numerical model according to the pollution source response parameters and the current risk controllable capacity of the scattered stain discharge points; the pollution source optimization water quality numerical model comprises: an objective function and a constraint;
the objective function is the self-cleaning capacity of the drainage basin;
the constraint includes: the method comprises the following steps of basin ecological function restriction, pollution source pollution discharge total amount restriction, pollution source pollution discharge demand restriction and basin environment safety restriction.
And the allowable discharge capacity determining module is used for determining the maximum allowable discharge capacity of the dispersed draining spots according to the current risk controllable capacity of the dispersed draining spots by taking whether the pollution source optimized water quality numerical model has the optimal solution as a judgment basis. The allowable discharge capacity determination module includes: the model solving submodule, the allowable capacity adjusting submodule, the allowable emission capacity determining submodule and the primary risk controllable capacity adjusting submodule are arranged; the model solving submodule is used for solving a pollution source optimized water quality numerical model; the allowable capacity adjusting submodule is used for adjusting the current allowable capacity of the dispersed stain discharging points to the current risk controllable capacity of the dispersed stain discharging points when the pollution source optimized water quality numerical model has the optimal solution; the allowable discharge capacity determining submodule is used for determining the adjusted allowable capacity as the maximum allowable discharge capacity of the scattered discharge spots when the absolute value of the difference value between the adjusted allowable capacity and the allowable capacity before adjustment is smaller than or equal to a preset safety threshold value;
and the primary risk controllable capacity adjusting submodule is used for adjusting the current risk controllable capacity of the dispersed stain discharge points according to the adjusted allowable capacity and the current unallowable capacity of the dispersed stain discharge points when the absolute value of the difference value between the adjusted allowable capacity and the adjusted allowable capacity is larger than a preset safety threshold, and then starting the model building module to build a pollution source optimized water quality numerical model according to the pollution source response parameters and the current risk controllable capacity of the dispersed stain discharge points.
The allowable discharge capacity determination module further includes: a disallowed capacity adjustment submodule and a secondary risk controllable capacity adjustment submodule; the unallowable capacity adjusting submodule is used for adjusting the current unallowable capacity of the dispersed stain discharging point to the current risk controllable capacity of the dispersed stain discharging point when the pollution source optimized water quality numerical model does not have the optimal solution; and the secondary risk controllable capacity adjusting submodule is used for adjusting the current risk controllable capacity of the dispersed stain discharging points according to the adjusted unallowable capacity and the current allowable capacity of the dispersed stain discharging points, and then starting the model building module to build a pollution source optimized water quality numerical model according to the pollution source response parameters and the current risk controllable capacity of the dispersed stain discharging points.
The management system is used for determining the river water environment capacity based on the water quality target of the water functional area, and comprises the following steps:
(1) determining a river catchment range in a water functional area by a computer by utilizing a method of combining ArcGIS software and actual river data of GPS positioning correction;
(2) collecting water quality monitoring data of the river in recent years, evaluating the water quality of the river in the water functional area by adopting a comprehensive pollution index method, and analyzing the water quality according to the current situation of the river; performing trend analysis on the water quality by adopting the spearman rank correlation coefficient to obtain the recent water quality change trend of each river;
(3) acquiring pollution source response parameters, wherein the pollution source response parameters comprise the discharge capacity of each index pollutant of a drainage basin, the positions of dispersed discharge points in the drainage basin and the discharge capacity in a metering period, and the discharge position, the discharge capacity of the pollutant and the pollutant type of a pollution source; the pollutants comprise COD and NH3-N and TP water quality indicators;
(4) constructing a pollution source optimized water quality numerical model according to the pollution source response parameters and the current risk controllable capacity of the scattered stain discharge points; the pollution source optimized water quality numerical model comprises: an objective function and a constraint;
the objective function is the self-cleaning capacity of the drainage basin;
the constraints comprise basin ecological function constraints, pollution source pollution discharge total quantity constraints, pollution source pollution discharge demand constraints and basin environment safety constraints.
(5) And determining the maximum allowable discharge capacity of the dispersed draining spots according to the current risk controllable capacity of the dispersed draining spots by taking whether the pollution source optimized water quality numerical model has the optimal solution as a judgment basis.
Step (5), comprising the following substeps:
(5.1) solving the pollution source optimized water quality numerical model;
(5.2) if the pollution source optimized water quality numerical model has the optimal solution, adjusting the current allowable capacity of the dispersed drainage spots to the current risk controllable capacity of the dispersed drainage spots;
(5.3) if the absolute value of the difference between the adjusted allowable capacity and the allowable capacity before adjustment is less than or equal to the preset safety threshold, determining the adjusted allowable capacity as the maximum allowable discharge capacity of the scattered dirt discharge points.
(5.4) if the absolute value of the difference value between the adjusted allowable capacity and the allowable capacity before adjustment is larger than the preset safety threshold, adjusting the current risk controllable capacity of the dispersed dirt discharge points according to the adjusted allowable capacity and the current unallowed capacity of the dispersed dirt discharge points;
and (5.5) constructing a pollution source optimized water quality numerical model according to the pollution source response parameters and the current risk controllable capacity of the scattered pollution discharging points.
(5.6) if the pollution source optimized water quality numerical model does not have the optimal solution, adjusting the current unallowable capacity of the dispersed drainage spots to the current risk controllable capacity of the dispersed drainage spots;
and (5.7) adjusting the current risk controllable capacity of the dispersed draining spots according to the adjusted unallowable capacity and the current allowable capacity of the dispersed draining spots, and then constructing a pollution source optimized water quality numerical model according to the pollution source response parameters and the current risk controllable capacity of the dispersed draining spots.
(5.8) calculating the mean value of the adjusted allowable capacity and the current unallowed capacity of the dispersed taint discharge point as a primary mean value, and adjusting the current risk controllable capacity of the dispersed taint discharge point to be the primary mean value;
(5.9) said adjusting the current risk controllable capacity of the dispersed spotting points according to the adjusted disallowed capacity and the current allowed capacity of the dispersed spotting points, comprising: and calculating the average value of the adjusted unallowable capacity and the current allowable capacity of the scattered dirt discharge points as a secondary average value, and adjusting the current risk controllable capacity of the scattered dirt discharge points to the secondary average value.
Claims (6)
1. A river water environment capacity determination method based on a water quality target of a water functional area is characterized by comprising the following steps:
(1) determining a river catchment range in a water functional area by a computer by utilizing a method of combining ArcGIS software and actual river data of GPS positioning correction;
(2) collecting water quality monitoring data of the river in recent years, evaluating the water quality of the river in the water functional area by adopting a comprehensive pollution index method, and analyzing the water quality according to the current situation of the river; performing trend analysis on the water quality by adopting the spearman rank correlation coefficient to obtain the recent water quality change trend of each river;
(3) acquiring pollution source response parameters, wherein the pollution source response parameters comprise the discharge capacity of each index pollutant of a drainage basin, the positions of dispersed discharge points in the drainage basin and the discharge capacity in a metering period, and the discharge position, the discharge capacity of the pollutant and the pollutant type of a pollution source; the pollutants comprise COD and NH3-N and TP water quality indicators;
(4) constructing a pollution source optimized water quality numerical model according to the pollution source response parameters and the current risk controllable capacity of the scattered stain discharge points;
(5) and determining the maximum allowable discharge capacity of the dispersed draining spots according to the current risk controllable capacity of the dispersed draining spots by taking whether the pollution source optimized water quality numerical model has the optimal solution as a judgment basis.
2. The method for determining river water environment capacity based on water quality target of water functional area according to claim 1, wherein the pollution source optimization water quality numerical model in step (4) comprises: an objective function and a constraint;
the objective function is the self-cleaning capacity of the drainage basin;
the constraints comprise basin ecological function constraints, pollution source pollution discharge total quantity constraints, pollution source pollution discharge demand constraints and basin environment safety constraints.
3. The method for determining the river water environment capacity based on the water quality target of the water functional area according to the claim 1 or 2, wherein the step (5) comprises the following sub-steps:
(5.1) solving the pollution source optimized water quality numerical model;
(5.2) if the pollution source optimized water quality numerical model has the optimal solution, adjusting the current allowable capacity of the dispersed drainage spots to the current risk controllable capacity of the dispersed drainage spots;
(5.3) if the absolute value of the difference between the adjusted allowable capacity and the allowable capacity before adjustment is less than or equal to the preset safety threshold, determining the adjusted allowable capacity as the maximum allowable discharge capacity of the scattered dirt discharge points.
4. The method for determining the river water environment capacity based on the water quality target of the water functional area according to claim 3, wherein the step (5) further comprises the following sub-steps:
(5.4) if the absolute value of the difference value between the adjusted allowable capacity and the allowable capacity before adjustment is larger than the preset safety threshold, adjusting the current risk controllable capacity of the dispersed dirt discharge points according to the adjusted allowable capacity and the current unallowed capacity of the dispersed dirt discharge points;
and (5.5) constructing a pollution source optimized water quality numerical model according to the pollution source response parameters and the current risk controllable capacity of the scattered pollution discharging points.
5. The method for determining the river water environment capacity based on the water quality target of the water functional area according to claim 3, wherein the step (5) further comprises the following sub-steps:
(5.6) if the pollution source optimized water quality numerical model does not have the optimal solution, adjusting the current unallowable capacity of the dispersed drainage spots to the current risk controllable capacity of the dispersed drainage spots;
and (5.7) adjusting the current risk controllable capacity of the dispersed draining spots according to the adjusted unallowable capacity and the current allowable capacity of the dispersed draining spots, and then constructing a pollution source optimized water quality numerical model according to the pollution source response parameters and the current risk controllable capacity of the dispersed draining spots.
6. The method for determining the river water environment capacity based on the water quality target of the water functional area according to claim 3, wherein the step (5) further comprises the following sub-steps:
(5.8) calculating the mean value of the adjusted allowable capacity and the current unallowed capacity of the dispersed taint discharge point as a primary mean value, and adjusting the current risk controllable capacity of the dispersed taint discharge point to be the primary mean value;
(5.9) said adjusting the current risk controllable capacity of the dispersed spotting points according to the adjusted disallowed capacity and the current allowed capacity of the dispersed spotting points, comprising: and calculating the average value of the adjusted unallowable capacity and the current allowable capacity of the scattered dirt discharge points as a secondary average value, and adjusting the current risk controllable capacity of the scattered dirt discharge points to the secondary average value.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113297814A (en) * | 2021-05-21 | 2021-08-24 | 中国环境科学研究院 | River lake water quality limit value-based watershed dynamic water environment capacity calculation method and system |
| CN117332959A (en) * | 2023-09-28 | 2024-01-02 | 中建生态环境集团有限公司 | River basin river entering pollutant regulation and control method based on section water quality reaching standard |
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| CN103218485A (en) * | 2013-04-03 | 2013-07-24 | 郑州大学 | Method for calculating small watershed environmental capacity under support of GIS (Geographic Information System) technology |
| JP2014134621A (en) * | 2013-01-09 | 2014-07-24 | Nikon Corp | Waterproof device |
| CN110516343A (en) * | 2019-08-22 | 2019-11-29 | 中国水利水电科学研究院 | Lake and reservoir environmental capacity of water based on Water Functional Zone water quality objective refines regulation method |
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| JP2014134621A (en) * | 2013-01-09 | 2014-07-24 | Nikon Corp | Waterproof device |
| CN103218485A (en) * | 2013-04-03 | 2013-07-24 | 郑州大学 | Method for calculating small watershed environmental capacity under support of GIS (Geographic Information System) technology |
| CN110516343A (en) * | 2019-08-22 | 2019-11-29 | 中国水利水电科学研究院 | Lake and reservoir environmental capacity of water based on Water Functional Zone water quality objective refines regulation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113297814A (en) * | 2021-05-21 | 2021-08-24 | 中国环境科学研究院 | River lake water quality limit value-based watershed dynamic water environment capacity calculation method and system |
| CN113297814B (en) * | 2021-05-21 | 2023-09-26 | 中国环境科学研究院 | River basin dynamic water environment capacity calculation method and system based on river and lake water quality limit value |
| CN117332959A (en) * | 2023-09-28 | 2024-01-02 | 中建生态环境集团有限公司 | River basin river entering pollutant regulation and control method based on section water quality reaching standard |
| CN117332959B (en) * | 2023-09-28 | 2024-05-28 | 中建生态环境集团有限公司 | River basin river entering pollutant regulation and control method based on section water quality reaching standard |
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