CN108460519A - Small-sized river pollutant carrying capacity disaster risk estimation method under pollution sources center of gravity generalization - Google Patents
Small-sized river pollutant carrying capacity disaster risk estimation method under pollution sources center of gravity generalization Download PDFInfo
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Abstract
The present invention relates to small-sized river pollutant carrying capacity disaster risk estimation methods under a kind of pollution sources center of gravity generalization, include the following steps：(1) investigation receive dirty section initial section position x and plan pollution sources quantity n, they are relative to section initial section position xiAnd discharge of sewage qi, pollutant concentration ci, determine that analysis generally changes mode if appropriate for center of gravity, estimate pollution sources center of gravity relative to initial section distance x if suitable center of gravity generalizationc；(2) measurement and determining dirty section controls up to par cross section place x', the initial section pollutant concentration C of receiving0, measure average section of river flow velocity u, discharge of river Q；(3) dirty section contaminant degradation coefficient k and its uncertainty α are received according to measurement result determination；(4) evaluation of risk of the variance D (W) of the section pollutant carrying capacity as the section pollutant carrying capacity is calculated.Through the invention, the risk of river pollutant carrying capacity in the case of pollution sources center of gravity generalization can be effectively estimated using this method, and improves the management level of river water quality.
Description
Technical field
The present invention relates to small-sized river pollutant carrying capacity disaster risk estimation methods under a kind of pollution sources center of gravity generalization, belong to urban river water
Matter management domain.
Background technology
The determination of river pollutant carrying capacity is the important means of river water quality management, and whether river pollutant carrying capacity result of calculation is smart
Whether the height and river water body protection for really determining river water quality management level succeed.In river pollutant carrying capacity calculating process
In, the pollution sources in planning are often generalized as in receiving dirty pollution of river source center of gravity section；This generalization of pollution sources mode is
The center of gravity for being referred to as pollution sources is generally changed.Generally the calculating of river pollutant carrying capacity is although more mature under change mode for previous center of gravity, but
It is the risk for not considering the uncertainty of pollutant carrying capacity estimation completely and bringing, this brings to river water quality protection and management work
Very detrimental effect.
Invention content
The purpose of the present invention aiming at above-mentioned drawback of the existing technology, in order to overcome it is existing in the prior art not
Foot, provides small-sized river pollutant carrying capacity disaster risk estimation method under a kind of pollution sources center of gravity generalization, and pollution can be effectively estimated in this method
The risk that small-sized river pollutant carrying capacity uncertainty is brought under center of gravity generalization of source is easy in water quality management is received in various small-sized rivers
It promotes.
The object of the present invention is achieved like this, small-sized river pollutant carrying capacity evaluation of risk under a kind of pollution sources center of gravity generalization
Method, which is characterized in that include the following steps：
(1) investigation receive dirty section initial section position x and plan pollution sources quantity n, they relative to the section originate
Cross section place xi(i=1,2 ..., n) and discharge of sewage qi(i=1,2 ..., n), pollutant concentration ci(i=1,2 ..., n),
It determines that analysis generally changes mode if appropriate for center of gravity, estimates pollution sources center of gravity relative to starting if suitable center of gravity generalization
Section distance xc；Specifically include following steps：
A. investigation determine receive dirty section initial section position x and it is existing and planning pollution sources quantity n, they are relative to this
Section initial section position xi(i=1,2 ..., n) and discharge of sewage qi(i=1,2 ..., n), pollutant concentration ci(i=1,
2,...,n)；
B. determine that analysis generally changes mode if appropriate for center of gravity, if planning analysis is not concentrated, but compared with
It is distributed in and receives on dirty section along journey for dispersion, then more pollution sources center of gravity is suitble to generally to change mode, if analysis is more
It concentrates on and receives certain point on dirty section and be then not suitable for pollution sources center of gravity and generally change mode；
C. disconnected relative to starting with following formula estimation pollution sources center of gravity if analysis is suitble to pollution sources center of gravity generalization
Identity distance is from xc；
(2) the determining dirty section controls up to par cross section place x', measurement initial section pollutant concentration C of receiving0, average section of river stream
Fast u, discharge of river Q；
(3) dirty section contaminant degradation coefficient k and its uncertainty α are received according to measurement result determination；It specifically includes following
Step:
A. repeated measurement controls up to par section pollutant concentration is multiple, calculates being averaged for controls up to par section pollutant concentration
Value, and as the mathematic expectaion E (C) of mark control section pollutant concentration；Calculate the variance D of controls up to par section pollutant concentration
(C)；
B. combine receive dirty section initial section position x, receive and dirty section controls up to par cross section place x' and be calculated
It marks the mathematic expectaion E (C) of control section pollutant concentration and measures obtained initial section pollutant concentration C0, average section of river
Flow velocity u；Contaminant degradation coefficient k is calculated with following formula：
C. combine receive dirty section initial section position x, receive and dirty section controls up to par cross section place x' and dirt be calculated
The initial section pollutant concentration that dye degradation coefficient k, the variance D (C) of controls up to par section pollutant concentration and measurement obtain
C0, average section of river flow velocity u；The uncertainty α of contaminant degradation coefficient is calculated with following formula：
(4) pollutant of controls up to par section concentration C up to standard is determineds, generally change characteristic, pollutant drop in conjunction with pollution sources center of gravity
Coefficient k and uncertainty α, average section of river flow velocity u, discharge of river Q are solved, the variance D (W) of the section pollutant carrying capacity is calculated, this
It is exactly the risk of the pollutant carrying capacity of the section；Specifically include following steps：
A. according to the water standard of controls up to par section downstream water demand, controls up to par section pollutant concentration up to standard is determined
Cs；
B. in conjunction with pollution sources center of gravity generally change characteristic, contaminant degradation coefficient k and uncertainty α, average section of river flow velocity u,
Discharge of river Q calculates the variance D (W) of the section pollutant carrying capacity with following formula, and here it is the risks of the pollutant carrying capacity of the section：
The advanced science of the method for the present invention, through the invention, small-sized river under pollution sources pollution sources center of gravity generalization of the invention
Pollutant carrying capacity disaster risk estimation method, includes the following steps：(1) investigation, which is received, dirty section initial section position x and plans pollution sources
Quantity n, they are relative to section initial section position xi(i=1,2 ..., n) and discharge of sewage qi(i=1,2 ..., n),
Pollutant concentration ci(i=1,2 ..., n), determine that analysis generally changes mode if appropriate for center of gravity, if being suitble to center of gravity general
Change then estimates pollution sources center of gravity relative to initial section distance xc；(2) it measures and determines that this receives dirty section controls up to par section position
Set x', initial section pollutant concentration C0, measure average section of river flow velocity u, discharge of river Q；(3) river is determined according to measurement result
Section contaminant degradation coefficient k and its uncertainty α；(4) generally change characteristic in conjunction with pollution sources center of gravity, contaminant degradation coefficient k and its
Uncertain α, average section of river flow velocity u, discharge of river Q, the variance D of the section pollutant carrying capacity is calculated with stochastic analysis result
(W), here it is the risks of the pollutant carrying capacity of the section.
In step (1), following steps are specifically included：
A. the determining quantity n for receiving dirty section initial section position x and planning pollution sources of investigation, they rise relative to the section
Beginning cross section place xi(i=1,2 ..., n) and discharge of sewage qi(i=1,2 ..., n), pollutant concentration ci(i=1,2 ...,
n)；
B. determine that analysis generally changes mode if appropriate for center of gravity：If analysis is not concentrated, but more divide
Scattered being distributed in along journey is received on dirty section, then more pollution sources center of gravity is suitble to generally to change mode；If analysis is more concentrated
Then be not suitable for pollution sources center of gravity in receiving certain point on dirty section and generally change mode；
C. disconnected relative to starting with following formula estimation pollution sources center of gravity if analysis is suitble to pollution sources center of gravity generalization
Identity distance is from xc；
In step (3), following steps are specifically included:
A. repeated measurement controls up to par section pollutant concentration is multiple, calculates the average value of the section pollutant concentration, and
Mathematic expectaion E (C) as the pollutant concentration；Calculate the variance D (C) of the section pollutant concentration；
B. it combines the pollutant mathematic expectaion E (C) being calculated and measures obtained initial section pollutant concentration C0,
Average section of river flow velocity u；According to stochastic differential analysis result, contaminant degradation coefficient k is calculated with following formula：
C. it combines and pollution degradation coefficient k is calculated, what the variance D (C) of the section pollutant concentration and measurement obtained
Initial section pollutant concentration C0, average section of river flow velocity u；According to stochastic differential analysis result, contaminant degradation is calculated with following formula
The uncertainty α of coefficient：
In step (4), following steps are specifically included：
A. according to the water standard of control section downstream water demand, control section pollutant concentration C up to standard is determineds；
B. the pollutant concentration C up to standard of control section is determineds, generally change characteristic, contaminant degradation system in conjunction with pollution sources center of gravity
Number k and uncertainty α, average section of river flow velocity u, discharge of river Q calculate the section with following formula with stochastic analysis result and receive dirt
The variance D (W) of ability, here it is the risks of the pollutant carrying capacity of the section：
Advantageous effect：The concept and estimation mode of present invention combination pollutant carrying capacity and stochastic analysis are theoretical, it is proposed that estimate
Calculate small-sized river pollutant carrying capacity risk estimation methods under pollution sources center of gravity generalization.It can effectively estimate pollution sources weight using this method
The risk of river pollutant carrying capacity in the case of the heart generalization, and improve the management level of river water quality.This method is simply square
Just, it is easy to promote in each river management is put into practice.
Description of the drawings
Fig. 1 is the flow diagram of the present invention.
Specific implementation mode
Small-sized river pollutant carrying capacity disaster risk estimation method under a kind of pollution sources center of gravity generalization, includes the following steps：
(1) investigation receive dirty section initial section position x and plan pollution sources quantity n, they relative to the section originate
Cross section place xi(i=1,2 ..., n) and discharge of sewage qi(i=1,2 ..., n), pollutant concentration ci(i=1,2 ..., n),
It determines that analysis generally changes mode if appropriate for center of gravity, estimates pollution sources center of gravity relative to starting if suitable center of gravity generalization
Section distance xc；Specifically include following steps：
A. investigation determine receive dirty section initial section position x and it is existing and planning pollution sources quantity n, they are relative to this
Section initial section position xi(i=1,2 ..., n) and discharge of sewage qi(i=1,2 ..., n), pollutant concentration ci(i=1,
2,...,n)；
B. determine that analysis generally changes mode if appropriate for center of gravity, if planning analysis is not concentrated, but compared with
It is distributed in and receives on dirty section along journey for dispersion, then more pollution sources center of gravity is suitble to generally to change mode, if analysis is more
It concentrates on and receives certain point on dirty section and be then not suitable for pollution sources center of gravity and generally change mode；
C. disconnected relative to starting with following formula estimation pollution sources center of gravity if analysis is suitble to pollution sources center of gravity generalization
Identity distance is from xc；
(2) the determining dirty section controls up to par cross section place x', measurement initial section pollutant concentration C of receiving0, average section of river stream
Fast u, discharge of river Q；
(3) dirty section contaminant degradation coefficient k and its uncertainty α are received according to measurement result determination；It specifically includes following
Step:
A. repeated measurement controls up to par section pollutant concentration is multiple, calculates being averaged for controls up to par section pollutant concentration
Value, and as the mathematic expectaion E (C) of mark control section pollutant concentration；Calculate the variance D of controls up to par section pollutant concentration
(C)；
B. combine receive dirty section initial section position x, receive and dirty section controls up to par cross section place x' and be calculated
It marks the mathematic expectaion E (C) of control section pollutant concentration and measures obtained initial section pollutant concentration C0, average section of river
Flow velocity u；Contaminant degradation coefficient k is calculated with following formula：
C. combine receive dirty section initial section position x, receive and dirty section controls up to par cross section place x' and dirt be calculated
The initial section pollutant concentration that dye degradation coefficient k, the variance D (C) of controls up to par section pollutant concentration and measurement obtain
C0, average section of river flow velocity u；The uncertainty α of contaminant degradation coefficient is calculated with following formula：
(4) pollutant of controls up to par section concentration C up to standard is determineds, generally change characteristic, pollutant drop in conjunction with pollution sources center of gravity
Coefficient k and uncertainty α, average section of river flow velocity u, discharge of river Q are solved, the variance D (W) of the section pollutant carrying capacity is calculated, this
It is exactly the risk of the pollutant carrying capacity of the section；Specifically include following steps：
A. according to the water standard of controls up to par section downstream water demand, controls up to par section pollutant concentration up to standard is determined
Cs；
B. in conjunction with pollution sources center of gravity generally change characteristic, contaminant degradation coefficient k and uncertainty α, average section of river flow velocity u,
Discharge of river Q calculates the variance D (W) of the section pollutant carrying capacity with following formula, and here it is the risks of the pollutant carrying capacity of the section：
The present invention is made with China's Taihu Plain small-sized river actual observation data below in conjunction with the accompanying drawings further
Invention.
(1) according to flow chart shown in Fig. 1, pollution sources construction plan on the river is investigated first：Plan pollution sources in the river
There are about 15, major pollutants are permanganate index, and emission flow is from 0.05 to 0.1 cube of meter per second；Permanganate index is dense
It spends from 8 mg/litres to 10.2 mg/litres.
What the pollution sources in planning more disperseed be distributed in along journey receives dirty section region；Therefore it can will rule of thumb plan
Generalization of pollution sources is positioned at the section position of centre of gravity discharge.
It records this and receives position x=0 meters of dirty section initial section.Using investigation of pollution sources as a result, receiving dirt using following formula determination
Distance x of the pollution sources center of gravity of section relative to initial sectionc；
In this example, 2 kilometers of pollution sources centroidal distance initial section, i.e. xc=2000 meters.
(2) it measures and determines that this receives dirty section controls up to par cross section place x' i.e. x' at 5.2 kilometers of initial section downstream
=5200 meters, initial section permanganate index concentration C0For 9.8 mg/litres, it is 0.01 meter per second to measure average section of river flow velocity u,
Discharge of river Q is 1.15 cubes of meter per seconds.
(2) repeated measurement control section permanganate index is multiple, calculates the average value of the section permanganate index, and
Mathematic expectaion E (C) as permanganate index；Calculate the variance D (C) of the section permanganate index.In this example, the control
The mathematic expectaion of the permanganate index of section processed is 7.2 mg/litres；The variance of permanganate index is 0.58 milligram2/ liter2
The degradation coefficient that the river permanganate index is calculated according to the following formula is 0.166/ day：
The uncertainty that the river permanganate index degradation coefficient is calculated according to the following formula is 0.077/ day1/2:
(3) the section downstream is agricultural water area, executes national water standard《GB3838-2002》In V class water quality marks
Standard, therefore the standard C of the control section permanganate indexsFor 15 mg/litres.
By the above-mentioned permanganate degradation coefficient and uncertainty measured and calculated, receive the length of dirty section, flow and
Flow velocity, initial section permanganate index substitute into following formula：
Can be calculated the risk for receiving dirty section pollutant carrying capacity under center of gravity generalization is 2.99 tons2/ day2。
Claims (1)
1. small-sized river pollutant carrying capacity disaster risk estimation method under a kind of pollution sources center of gravity generalization, which is characterized in that including following step
Suddenly：
(1) investigation receive dirty section initial section position x and plan pollution sources quantity n, they are relative to the section initial section
Position xi(i=1,2 ..., n) and discharge of sewage qi(i=1,2 ..., n), pollutant concentration ci(i=1,2 ..., n), determine
Analysis generally changes mode if appropriate for center of gravity, estimates pollution sources center of gravity relative to initial section if suitable center of gravity generalization
Distance xc；Specifically include following steps：
A. investigation determine receive dirty section initial section position x and it is existing and planning pollution sources quantity n, they are relative to the section
Initial section position xi(i=1,2 ..., n) and discharge of sewage qi(i=1,2 ..., n), pollutant concentration ci(i=1,
2,...,n)；
B. it determines that analysis generally changes mode if appropriate for center of gravity, if planning analysis is not concentrated, but more divides
Scattered being distributed in along journey is received on dirty section, then more pollution sources center of gravity is suitble to generally to change mode, if analysis is more concentrated
Then be not suitable for pollution sources center of gravity in receiving certain point on dirty section and generally change mode；
C. if analysis is suitble to pollution sources center of gravity generalization with following formula estimate pollution sources center of gravity relative to initial section away from
From xc；
；
(2) the determining dirty section controls up to par cross section place x', measurement initial section pollutant concentration C of receiving0, average section of river flow velocity u,
Discharge of river Q；
(3) dirty section contaminant degradation coefficient k and its uncertainty α are received according to measurement result determination；Specifically include following steps:
A. repeated measurement controls up to par section pollutant concentration is multiple, calculates the average value of controls up to par section pollutant concentration,
And as the mathematic expectaion E (C) of mark control section pollutant concentration；Calculate the variance D of controls up to par section pollutant concentration
(C)；
B. combine receive dirty section initial section position x, receive dirty section controls up to par cross section place x' and the mark control that is calculated
The initial section pollutant concentration C that the mathematic expectaion E (C) of section pollutant concentration processed and measurement obtain0, average section of river flow velocity
u；Contaminant degradation coefficient k is calculated with following formula：
；
C. combine receive dirty section initial section position x, receive dirty section controls up to par cross section place x' and be calculated pollution drop
The initial section pollutant concentration C that solution coefficient k, the variance D (C) of controls up to par section pollutant concentration and measurement obtain0, river
Section mean flow rate u；The uncertainty α of contaminant degradation coefficient is calculated with following formula：
；
(4) pollutant of controls up to par section concentration C up to standard is determineds, generally change characteristic, contaminant degradation system in conjunction with pollution sources center of gravity
Number k and uncertainty α, average section of river flow velocity u, discharge of river Q, calculate the variance D (W) of the section pollutant carrying capacity, here it is
The risk of the pollutant carrying capacity of the section；Specifically include following steps：
A. according to the water standard of controls up to par section downstream water demand, controls up to par section pollutant concentration C up to standard is determineds；
B. generally change characteristic, contaminant degradation coefficient k and uncertainty α, average section of river flow velocity u, river in conjunction with pollution sources center of gravity
Flow Q calculates the variance D (W) of the section pollutant carrying capacity with following formula, and here it is the risks of the pollutant carrying capacity of the section：
。
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| CN113240203A (en) * | 2021-06-16 | 2021-08-10 | 生态环境部南京环境科学研究所 | Method for calculating pollution contribution rate of medium and small river channel sections of multiple pollution sources |
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| CN113240203A (en) * | 2021-06-16 | 2021-08-10 | 生态环境部南京环境科学研究所 | Method for calculating pollution contribution rate of medium and small river channel sections of multiple pollution sources |
| CN113240203B (en) * | 2021-06-16 | 2024-04-16 | 生态环境部南京环境科学研究所 | Method for calculating pollution contribution rate of cross section of small river in multiple pollution sources |
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