CN111898273B - 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 a water quality target of a water functional area, which uses a computer to determine a river catchment range 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; and determining the maximum allowable discharge capacity of the scattered stain discharge according to the current risk controllable capacity of the scattered stain discharge by taking whether the optimal solution exists in the pollution source optimized water quality numerical model as a judgment basis. The method is simple and high in precision, and the allowable sewage discharge capacity of the water environment considering each sewage discharge spot of the river can be determined.
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 types of deterministic methods and uncertainty methods.
The deterministic method takes a mechanical water quality model as a main tool, mainly comprises an analytical formula method, a model trial-and-error method and a simulation optimization method, uncertainty factors are introduced through limiting conditions, requirements on safety and control risk are expressed, and a calculation result is a fixed value. The analytic formula method adopts a steady-state water quality model to directly calculate, 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 for repeated measurement and calculation, and has high calculation precision but 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 the concept of the capacity and the total amount is almost synonymous, is different from the connotation of the domestic water environment capacity, and emphasizes the total amount distribution of pollutants.
The uncertainty method analyzes and calculates the water environment capacity or the value range of the capacity under a certain credibility level from an uncertainty angle, wherein the water quality stochastic process method, the stochastic differential equation model method and the gray (parameter) water quality planning method based on a deterministic model are not widely applied due to the reasons of limitation of interval value on distribution, complexity of mathematical treatment and the like.
Disclosure of Invention
The invention aims to provide a pollution discharge distributor which is simple in calculation, high in precision and capable of distributing pollutant discharge at dispersed pollution discharge points. The specific technical scheme is as follows:
a river water environment capacity determining method based on water quality targets of water functional areas comprises the following steps:
(1) Determining a river catchment range in the water function area by using a computer by using an ArcGIS software and GPS positioning correction actual river data combination method;
(2) Collecting water quality monitoring data of the river in recent years, evaluating the water quality of the river in the water function area by adopting a comprehensive pollution index method, and analyzing the current situation of the river; carrying out trend analysis on water quality by adopting a sporman rank correlation coefficient to obtain the recent water quality change trend of each river;
(3) Obtaining pollution source response parameters, wherein the pollution source response parameters comprise the pollution discharge amount of each index pollutant of a river basin, the position of dispersed discharged stains in the river basin and the pollution discharge amount in a metering period, and the pollution discharge position, the pollutant discharge amount and the pollutant type of the pollution source; the pollutants comprise COD and NH 3 -N and TP water quality index;
(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;
(5) And determining the maximum allowable discharge capacity of the scattered stain discharge according to the current risk controllable capacity of the scattered stain discharge by taking whether the optimal solution exists in the pollution source optimized water quality numerical model as a judgment basis.
The pollution source optimizing water quality numerical model in the step (4) comprises the following steps: objective functions and constraints;
the objective function is the self-cleaning capacity of the river basin;
the constraints comprise a river basin ecological function constraint, a pollution source total pollution discharge amount constraint, a pollution source pollution discharge demand amount constraint and a river basin environment safety constraint.
Step (5) comprising the sub-steps of:
(5.1) solving the pollution source optimized water quality numerical model;
(5.2) if the pollution source optimized water quality numerical model has an optimal solution, adjusting the current allowable capacity of the scattered stain discharge to the current risk controllable capacity of the scattered stain discharge;
and (5.3) if the absolute value of the difference between the adjusted allowable capacity and the allowable capacity before adjustment is smaller than or equal to a preset safety threshold, determining the adjusted allowable capacity as the maximum allowable discharge capacity of the scattered stains.
Step (5) further comprises the sub-steps of:
(5.4) if the absolute value of the difference between the adjusted allowable capacity and the allowable capacity before adjustment is greater than the preset safety threshold, adjusting the current risk controllable capacity of the scattered stain removal according to the adjusted allowable capacity and the current disallowed capacity of the scattered stain removal;
(5.5) then performing said constructing a pollution source optimized water quality numerical model based on said pollution source response parameters and the current risk controllable capacity of the dispersed drain points.
Step (5) further comprises the sub-steps of:
(5.6) if the pollution source optimized water quality numerical model does not have an optimal solution, adjusting the current disallowed capacity of the scattered stain discharge to the current risk controllable capacity of the scattered stain discharge;
and (5.7) adjusting the current risk controllable capacity of the scattered stain discharge according to the adjusted impermissible capacity and the current allowable capacity of the scattered stain discharge, and then executing the construction of 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.
Step (5) further comprises the sub-steps of:
(5.8) calculating an average value of the adjusted allowable capacity and the current allowable capacity of the scattered stain removal as a primary average value, and adjusting the current risk controllable capacity of the scattered stain removal to the primary average value;
(5.9) adjusting the current risk controllable capacity of the dispersed spot according to the adjusted disallowed capacity and the current allowed capacity of the dispersed spot, including: and calculating the average value of the adjusted disallowed capacity and the current allowable capacity of the scattered stain discharge as a secondary average value, and adjusting the current risk controllable capacity of the scattered stain discharge to the secondary average value.
The invention has the advantages that:
according to the river water environment capacity determining method based on the water quality target of the water functional area, the pollution source optimizing water quality numerical model can be constructed according to the pollution source response parameters and the current risk controllable capacity of the scattered stain discharge, whether the pollution source optimizing water quality numerical model has an optimal solution or not is taken as a judgment basis, the maximum allowable discharge capacity of the scattered stain discharge is determined according to the current risk controllable capacity of the scattered stain discharge, the method is simple and high in accuracy, and the allowable discharge capacity of the water environment considering each stain discharge of a river can be determined.
Detailed Description
The present invention will be further described with reference to the following examples, but the scope of the present invention is not limited thereto.
Firstly, a complete river water environment capacity management system is established, and the system 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 pollution discharge amount of pollutants of various indexes of a river basin, the position of scattered discharged stains in the river basin and the pollution discharge amount in a metering period, and the pollution discharge position, the pollutant discharge amount and the pollutant types 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; the pollution source optimizing water quality numerical model comprises the following steps: objective functions and constraints;
the objective function is the self-cleaning capability of the river basin;
the constraints include: the ecological function constraint of the river basin, the total pollution source and pollution discharge amount constraint, the pollution source and pollution discharge demand constraint and the safety constraint of the river basin environment.
The allowable discharge capacity determining module is used for determining the maximum allowable discharge capacity of the scattered stain discharge according to the current risk controllable capacity of the scattered stain discharge by taking whether the optimal solution exists in the pollution source optimized water quality numerical model as a judging basis. The allowable discharge capacity determination module includes: the system comprises a model solving sub-module, a capacity adjustment allowing sub-module, a discharge capacity determining sub-module and a primary risk controllable capacity adjustment sub-module; the model solving sub-module is used for solving a pollution source optimizing water quality numerical model; the allowable capacity adjustment sub-module is used for adjusting the current allowable capacity of the scattered stain discharge to the current risk controllable capacity of the scattered stain discharge when the optimal solution exists in the pollution source optimized water quality numerical model; a permissible discharge capacity determination sub-module for determining the adjusted permissible capacity as a maximum permissible discharge capacity of the scattered spot discharge when an absolute value of a difference between the adjusted permissible capacity and the permissible capacity before adjustment is less than or equal to a preset safety threshold;
the primary risk controllable capacity adjustment sub-module is used for adjusting the current risk controllable capacity of the scattered stain discharge according to the adjusted allowable capacity and the current disallowed capacity of the scattered stain discharge when the absolute value of the difference between the adjusted allowable capacity and the allowable capacity before adjustment is larger than a preset safety threshold, and then starting the model construction module to construct 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.
The allowable discharge capacity determination module further includes: a capacity adjustment sub-module and a secondary risk controllable capacity adjustment sub-module are not allowed; a disallowed capacity adjustment sub-module for adjusting the current disallowed capacity of the scattered stain discharge to the current risk controllable capacity of the scattered stain discharge when the optimal solution does not exist in the pollution source optimized water quality numerical model; the secondary risk controllable capacity adjustment sub-module is used for adjusting the current risk controllable capacity of the scattered stain discharge according to the adjusted impermissible capacity and the current allowable capacity of the scattered stain discharge, and then starting the model construction module to construct 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.
The river water environment capacity determining method based on the water quality target of the water functional area is adopted by the management system and comprises the following steps:
(1) Determining a river catchment range in the water function area by using a computer by using an ArcGIS software and GPS positioning correction actual river data combination method;
(2) Collecting water quality monitoring data of the river in recent years, evaluating the water quality of the river in the water function area by adopting a comprehensive pollution index method, and analyzing the current situation of the river; carrying out trend analysis on water quality by adopting a sporman rank correlation coefficient to obtain the recent water quality change trend of each river;
(3) Obtaining pollution source response parameters, wherein the pollution source response parameters comprise the pollution discharge amount of each index pollutant of a river basin, the position of dispersed discharged stains in the river basin and the pollution discharge amount in a metering period, and the pollution discharge position, the pollutant discharge amount and the pollutant type of the pollution source; the pollutants comprise COD and NH 3 -N and TP water quality index;
(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; the pollution source optimizing water quality numerical model comprises the following steps: objective functions and constraints;
the objective function is the self-cleaning capacity of the river basin;
the constraints comprise a river basin ecological function constraint, a pollution source total pollution discharge amount constraint, a pollution source pollution discharge demand amount constraint and a river basin environment safety constraint.
(5) And determining the maximum allowable discharge capacity of the scattered stain discharge according to the current risk controllable capacity of the scattered stain discharge by taking whether the optimal solution exists in the pollution source optimized water quality numerical model as a judgment basis.
Step (5) comprising the sub-steps of:
(5.1) solving the pollution source optimized water quality numerical model;
(5.2) if the pollution source optimized water quality numerical model has an optimal solution, adjusting the current allowable capacity of the scattered stain discharge to the current risk controllable capacity of the scattered stain discharge;
and (5.3) if the absolute value of the difference between the adjusted allowable capacity and the allowable capacity before adjustment is smaller than or equal to a preset safety threshold, determining the adjusted allowable capacity as the maximum allowable discharge capacity of the scattered stains.
(5.4) if the absolute value of the difference between the adjusted allowable capacity and the allowable capacity before adjustment is greater than the preset safety threshold, adjusting the current risk controllable capacity of the scattered stain removal according to the adjusted allowable capacity and the current disallowed capacity of the scattered stain removal;
(5.5) then performing said constructing a pollution source optimized water quality numerical model based on said pollution source response parameters and the current risk controllable capacity of the dispersed drain points.
(5.6) if the pollution source optimized water quality numerical model does not have an optimal solution, adjusting the current disallowed capacity of the scattered stain discharge to the current risk controllable capacity of the scattered stain discharge;
and (5.7) adjusting the current risk controllable capacity of the scattered stain discharge according to the adjusted impermissible capacity and the current allowable capacity of the scattered stain discharge, and then executing the construction of 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.
(5.8) calculating an average value of the adjusted allowable capacity and the current allowable capacity of the scattered stain removal as a primary average value, and adjusting the current risk controllable capacity of the scattered stain removal to the primary average value;
(5.9) adjusting the current risk controllable capacity of the dispersed spot according to the adjusted disallowed capacity and the current allowed capacity of the dispersed spot, including: and calculating the average value of the adjusted disallowed capacity and the current allowable capacity of the scattered stain discharge as a secondary average value, and adjusting the current risk controllable capacity of the scattered stain discharge to the secondary average value.
Claims (6)
1. A river water environment capacity determining 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 the water function area by using a computer by using an ArcGIS software and GPS positioning correction actual river data combination method;
(2) Collecting water quality monitoring data of the river in recent years, evaluating the water quality of the river in the water function area by adopting a comprehensive pollution index method, and analyzing the current situation of the river; carrying out trend analysis on water quality by adopting a sporman rank correlation coefficient to obtain the recent water quality change trend of each river;
(3) Obtaining pollution source response parameters, wherein the pollution source response parameters comprise the pollution discharge amount of each index pollutant of a river basin and the scattered pollution discharge positionsPosition in the flow field and discharge capacity in the metering period, and discharge position, pollutant discharge capacity and pollutant type of the pollution source; the pollutants comprise COD and NH 3 -N and TP water quality index;
(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;
(5) And determining the maximum allowable discharge capacity of the scattered stain discharge according to the current risk controllable capacity of the scattered stain discharge by taking whether the optimal solution exists in the pollution source optimized water quality numerical model as a judgment basis.
2. The method for determining the environmental capacity of a river water based on the water quality objective of a water function area according to claim 1, wherein the pollution source optimizing water quality numerical model in step (4) comprises: objective functions and constraints;
the objective function is the self-cleaning capacity of the river basin;
the constraints comprise a river basin ecological function constraint, a pollution source total pollution discharge amount constraint, a pollution source pollution discharge demand amount constraint and a river basin environment safety constraint.
3. A method for determining the environmental capacity of a river based on the water quality objective of a water function area according to claim 1 or 2, characterized by the step (5) of:
(5.1) solving the pollution source optimized water quality numerical model;
(5.2) if the pollution source optimized water quality numerical model has an optimal solution, adjusting the current allowable capacity of the scattered stain discharge to the current risk controllable capacity of the scattered stain discharge;
and (5.3) if the absolute value of the difference between the adjusted allowable capacity and the allowable capacity before adjustment is smaller than or equal to a preset safety threshold, determining the adjusted allowable capacity as the maximum allowable discharge capacity of the scattered stains.
4. A method for determining the environmental capacity of a river based on the water quality objective of a water function field as defined in claim 3, wherein the step (5) further comprises the sub-steps of:
(5.4) if the absolute value of the difference between the adjusted allowable capacity and the allowable capacity before adjustment is greater than the preset safety threshold, adjusting the current risk controllable capacity of the scattered stain removal according to the adjusted allowable capacity and the current disallowed capacity of the scattered stain removal;
(5.5) then performing said constructing a pollution source optimized water quality numerical model based on said pollution source response parameters and the current risk controllable capacity of the dispersed drain points.
5. A method for determining the environmental capacity of a river based on the water quality objective of a water function field as defined in claim 3, wherein the step (5) further comprises the sub-steps of:
(5.6) if the pollution source optimized water quality numerical model does not have an optimal solution, adjusting the current disallowed capacity of the scattered stain discharge to the current risk controllable capacity of the scattered stain discharge;
and (5.7) adjusting the current risk controllable capacity of the scattered stain discharge according to the adjusted impermissible capacity and the current allowable capacity of the scattered stain discharge, and then executing the construction of 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.
6. A method for determining the environmental capacity of a river based on the water quality objective of a water function field as defined in claim 3, wherein the step (5) further comprises the sub-steps of:
(5.8) calculating an average value of the adjusted allowable capacity and the current allowable capacity of the scattered stain removal as a primary average value, and adjusting the current risk controllable capacity of the scattered stain removal to the primary average value;
(5.9) adjusting the current risk controllable capacity of the dispersed spot according to the adjusted disallowed capacity and the current allowed capacity of the dispersed spot, including: and calculating the average value of the adjusted disallowed capacity and the current allowable capacity of the scattered stain discharge as a secondary average value, and adjusting the current risk controllable capacity of the scattered stain discharge to the secondary average value.
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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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