CN107292527A - A kind of sewerage system performance estimating method - Google Patents
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- 101100366940 Mus musculus Stom gene Proteins 0.000 description 3
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Abstract
The invention discloses a kind of sewerage system performance estimating method, belong to municipal drainage technical field.This method integrated system elasticity is assessed and Assessment of Sustainability, and it is concretely comprised the following steps：(1) system resilience evaluation index and Assessment of Sustainability index are determined, and weighs the factor of each index；(2) sewerage system model is utilized, these factor values are calculated, and corresponding desired value is calculated according to formula；(3) by integrated formula, the performance index of drainage system is calculated.The method of the present invention can assess sewerage system performance, and system resilience, sustainability in the case of different threats (extreme rainfall, component failures etc.), assessment result is more accurate, objective, and workable, is capable of the planning and designing of preferably assisted drainage system.
Description
Technical field
The invention belongs to municipal drainage technical field, more specifically to a kind of assessment of sewerage system performance
Method.
Background technology
Sewerage system refers to collect, convey, handle, regenerate and dispose the facility of sewage and rainwater group in a certain way
The totality (separate system storm-water system or combined flow system) of synthesis, under Global climate change and the background of urbanization, in city
It is flooded frequently to occur.Sewerage system is the important component of urban waterlogging preventing and treating, and the quality of its systematic function is used for
Most important, therefore, the assessment of sewerage system performance just has great importance.
How systematic function is assessedThe research to drainage system Performance Evaluation carried out at present, is substantially from waterpower
Can (hydraulic performance) set out, according to different scenes (different reoccurrence, rainfall pattern etc.), by modeling or
Analysis is calculated, some indexs are obtained, such as ponding volume, ponding last, depth of accumulated water, then the row of assessment is gone to according to these parameters
The performance of water system.But the appraisal procedure of current existing sewerage system performance mostly has the following disadvantages：One is not consider
Difference threatens the elasticity (resilience) of system in the case of (such as component failures)；Two be the sustainability for not considering system, because
This, existing appraisal procedure is difficult to the performance quality for truly judging sewerage system.
Said system elasticity refers to system under extreme rain fall under (such as a-hundred-year rainfall) or component of a system failure
The response of (such as blocking of Pipeline damage, inlet for stom water, failure of pump) to these threats (extreme rainfall, component damage etc.) recovers energy
Power.Mugumeet al. (2015) have carried out research to the flexibility analysis method of drainage system, using total waterlogging volume, always become a mandarin
Volume, four indexs of average waterlogging time and simulated time calculate and quantify elasticity, and analyze Pipeline damage from 0%-100%'s
Drainage system elasticity number (with the increase of Pipeline damage ratio, elasticity is also decreased).TahmasebiBirgani Y.etal.
(2013) system resilience is quantified using waterlogging volume and recovery time two indices.Casal-Camposetal. in (2015)
Elastic index includes 5 classifications：Pipeline waterlogging, river dissolved oxygen, river ammonia nitrogen, combined sewer overflow, river flood, each classification
Elasticity quantify also different, such as pipeline waterlogging lasts two indices quantization using waterlogging volume and waterlogging, and river dissolved oxygen is adopted
Quantified with year least concentration with two indices are lasted.Two documents consider climate change etc. after wherein, but do not account for component
The threat situation of (Pipeline damage etc.) is damaged, therefore its elasticity to municipal drainage performance is assessed and there is larger error.
In the case that system sustainability refers to that system keeps service standard, make society, economy, environmental index benefit maximum
Change.But, the need for research, the first class index of drainage system sustainability, it is not limited to society, economy, environment three
Individual aspect.Due to differences such as research purpose, objects, first class index, two-level index (parameter), computational methods are also variant.
TahmasebiBirgani Y.etal. (2013) first class index considers traditional society, economy, three aspects of environment, and two grades refer to
Mark is respectively adopted benefit attractive in appearance, cost and maintenance cost, Rainwater Quality, quantization parameter be respectively beautifying city ability (it is high/
It is medium/low), kind of Best Management Practices construction cost ($) and maintenance cost ($/year), total suspended solid (Kg).Casal-
Camposetal. (2015) sustainability first class index using pipeline waterlogging, river dissolved oxygen, river ammonia nitrogen, combined sewer overflow,
River flood, using energy source, cost, acceptability, parameter are respectively impacted loss (￡), the influence to aquatic resources
([6h minimum (mg/l)]), the influence ([99%ile (mg/l)]) to aquatic resources, overflow to it is attractive in appearance with health effect,
CO when impacted loss (￡), operation2Discharge (ton), it is life cycle cost (￡), high/medium/low.
Therefore, system resilience and sustainability are included to the assessment factor scope of sewerage system performance, for city
The accurate objective judgement of drainage system performance is significant, so as to preferably instruct the optimization of sewerage system to set
Meter.
The content of the invention
1. the invention technical problem to be solved
It is an object of the invention to overcome to be difficult to truly judge city using existing sewerage system performance estimating method
There is provided a kind of sewerage system performance estimating method for the deficiency of drainage system performance quality.Integrated system elasticity of the present invention
Assess and sustainable assessment, by sewerage system model, by quantitative approach, drainage system performance integrate to comment
It is fixed, so as to which accuracy, the objectivity of sewerage system Performance Evaluation is effectively ensured, and then it can be preferably applied to instruct
The optimization design of sewerage system.
2. technical scheme
To reach above-mentioned purpose, the technical scheme that the present invention is provided is：
A kind of sewerage system performance estimating method of the present invention, this method integrated system elasticity is assessed and sustainability
Assess, Comprehensive Assessment is carried out to sewerage system performance, following steps are specifically included：
Step 1: determining system resilience evaluation index and Assessment of Sustainability index, and weigh the factor of each index；
Step 2: using sewerage system model, above-mentioned factor values are calculated, and calculating obtains corresponding evaluation index
Value；
Step 3: by integrated formula, calculating the performance index for obtaining drainage system.
Further, the index of measurement system resilience is：{ system resilience }, the factor of measurement index { system resilience }
For：{ elasticity }；The index of measurement system sustainability is：{ society, economical, environment }, the factor of measurement index { society } is：
{ system waterlogging volume }；The factor of measurement index { economic } is：{ system cost, system operation maintenance cost }；Measurement index { ring
Border } the factor be：{ contamination control rate, rainwater utilization amount }.
Further, what the system resilience was assessed comprises the following steps that：
(1) from hydraulic performance angle, using sewerage system model, extreme rain fall or the component of a system are simulated
Failure situation, obtains corresponding parameter value：Waterlogging volume, waterlogging lasts, into the runoff cumulative volume of system, and total simulation lasts；
(2) calculate and weigh the factor { elasticity }, its calculation formula is as follows：
In above formula, R0For { elasticity } factor, scope is [0,1], for a certain specific scene, and 0 represents that elasticity is very low, 1
Represent that elasticity is very high；F is the total waterlogging volume of system, for the summation of all node waterlogging volumes；D is all waterlogging nodes in system
Average waterlogging lasts；VtiTo enter the runoff cumulative volume of system；tnAlways simulate and last for system；
(3) measurement index { system resilience } is calculated, its calculation formula is：
In above formula, R is { system resilience } index, and R is bigger, represents that the elasticity of drainage system is better, in specific threat
Adaptability is stronger, recovers faster；I is the number of components of system failure；N is the total the number of components of system；R0,iFor when i
{ elasticity } factor values corresponding during component damage, are calculated by formula (a)；PiFor the corresponding damage fraction when i component damage,
Calculated and obtained by certain particular type component damage number divided by certain particular type component sum.
Further, the step of system Assessment of Sustainability is as follows：
(1) sewerage system model is utilized, extreme rain fall or component of a system failure situation is simulated, acquired corresponding
Parameter value：Waterlogging volume, annual flow overall control rate, single contamination index such as TSS, total nitrogen, total phosphorus or its combined index, rain
Milliosmolarity, rain water storage storage under water；
(2) drainage system actual conditions to be assessed are combined, the maximum of the Assessment of Sustainability metrics evaluation factor is set
And minimum value, normalized is made to evaluation points, from Min-max standardized methods, formula is as follows：
In formula, actual value is the numerical value of certain parameter, is obtained by modeling or as obtained by calculating；Minimum value takes zero or taken
The actual value lower limit value of multiple schemes；Maximum, waterlogging volume value, with reference to be not provided with it is low influence development facility scene under
The total waterlogging volume value of system；Contamination control rate maximum is set to 0.9, and the maximum of other specification is set with reference to actual value；
(3) measurement index { society } is calculated, its calculation formula is：
ISo=1-IF(d)；
In formula, ISoFor { society } index, ISoIt is bigger, show that the social effect of system is better；IFFor normalized waterlogging body
Product, is calculated by modeling and normalization formula (c) and obtained；
(4) measurement index { economic } is calculated, its calculation formula is as follows：
IEc=[(1-IC1)(1-IC2)]1/2(e)；
In formula, IEcFor { economical } index, IEcIt is bigger, show that the economic effect of system is better；IC1Made for normalized system
Valency, IC2For normalized system maintenance operating cost；
(5) measurement index { environment } is calculated, its calculation formula is as follows：
IEn=(IK·IS)1/2(f)；
In formula, IEnFor { environment } index, IEnIt is bigger, show that system is better to the effect of environment；IKFor normalized pollution
Control rate, can be represented by annual flow overall control rate, or with single contamination index such as TSS, total nitrogen, total phosphorus or combined index table
Show；ISFor normalized rainwater utilization amount, being calculated by rainwater infiltration amount and rainwater storage amount (can be by modeling and normalization
Formula (c), which is calculated, to be obtained)；
(6) measurement index { sustainability } is calculated, its calculation formula is as follows：
S=(ISo·IEc·IEn)1/3(g)；
In formula, S is { sustainability } index, and S is bigger, represents that the sustainability of drainage system is better；ISoRefer to for { society }
Mark, is calculated by formula (d)；IEcFor { economic } index, calculated by formula (e)；IEnCalculated for { environment } index by formula (f).
Further, when there is multiple schemes in drainage system planning and designing, the parameter maximum ginseng in formula (c)
Examine the parameter actual value upper limit value in multiple schemes；When only single scheme, parameter maximum is directly with reference in actual value
Value is limited, and control is at less than 2 times of actual value upper limit value.
Further, the calculation formula of the drainage system performance index is：
PI=(RS)1/2(h)；
In formula, PI is systematic function index, and PI is bigger, represents that the performance of drainage system is better；R is that { system resilience } refers to
Mark, is calculated by formula (b)；S is { sustainability } index, is calculated by formula (g).
3. beneficial effect
The technical scheme provided using the present invention, compared with prior art, with following remarkable result：
(1) a kind of sewerage system performance estimating method of the invention, integrated system elasticity is assessed and sustainable assessment,
By sewerage system model, by quantitative approach, Comprehensive Assessment is carried out to drainage system performance, assessment result is more accurate
Really, and consider drainage system practical operation situation (such as component failures), therefore, it is possible to be preferably applied to instruct municipal drainage system
The optimization and design of system, are conducive to designing the sewerage system of more elasticity and sustainability.
(2) a kind of sewerage system performance estimating method of the invention, for society, environmental index, giving has
The measurement factor of metrizability, it is ensured that the operability and objectivity of assessment；Simultaneously to { economical }, { environment }, { sustainable
Property } and the assessment formula of drainage system performance index optimize, artificial evaluation criterion weight is set so as to be prevented effectively from
Subjectivity, further ensure accuracy, the objectivity of System drainage Performance Evaluation.
Brief description of the drawings
Fig. 1 is a kind of index of sewerage system performance estimating method of the present invention and the schematic diagram of factor composition.
Fig. 2 is elastic calculation result of the system resilience assessment in the case of pipeline fault (0%-100%) in embodiment 1.
Embodiment
A kind of sewerage system performance estimating method of the present invention, this method integrated system elasticity is assessed and sustainability
Assess, Comprehensive Assessment is carried out to sewerage system performance, following steps are specifically included：
Step 1: determining system resilience evaluation index and Assessment of Sustainability index, and weigh the factor of each index.
System resilience, which is assessed, refers to system under extreme rain fall under (such as a-hundred-year rainfall) or component of a system failure
(such as blocking of Pipeline damage, inlet for stom water, failure of pump) is to the response recovery capability of these threats (extreme rainfall, component damage etc.)
Assess.System Assessment of Sustainability refers to that system (refers mainly to climate change, the feelings of land use change survey in the case of different threats
Scape, does not consider component failures, i.e. component failures 0%) Assessment of Sustainability.
The index of measurement system resilience is in the present invention：{ system resilience }, the factor of measurement index { system resilience } is：
{ elasticity }；The index of measurement system sustainability is：{ society, economical, environment }, the factor of measurement index { society } is：{ system
Waterlogging volume }；The factor of measurement index { economic } is：{ system cost, system operation maintenance cost }；Measurement index { environment }
The factor is：{ contamination control rate, rainwater utilization amount }.
Step 2: using sewerage system model, above-mentioned factor values are calculated, and calculating obtains corresponding evaluation index
Value.
What system resilience was assessed in the present invention comprises the following steps that：
(1) from hydraulic performance angle, using sewerage system model, extreme rain fall is simulated (such as a century one
Meet rainfall) or component of a system failure situation (such as blocking of Pipeline damage, inlet for stom water, failure of pump), obtain corresponding parameter value：It is interior
Flooded volume, waterlogging lasts, into the runoff cumulative volume of system, and total simulation lasts；
(2) calculate and weigh the factor { elasticity }, its calculation formula is as follows：
In above formula, R0For { elasticity } factor, scope is [0,1], for a certain specific scene (extreme rainfall, tripe systems
Part damage ratio etc.), 0 represents that elasticity is very low, and 1 represents that elasticity is very high；F is the total waterlogging volume of system, for all node waterlogging bodies
Long-pending summation；D lasts for the average waterlogging of all waterlogging nodes in system；VtiTo enter the runoff cumulative volume of system；tnFor system
Total simulation lasts；
(3) measurement index { system resilience } is calculated, its calculation formula is：
In above formula, R is { system resilience } index, and R is bigger, represents that the elasticity of drainage system is better, in specific threat (component
Damage, extreme rainfall etc.) in adaptability it is stronger, recover faster；I for system failure component (pipeline, water pump and other
Type component) quantity；N is total component (pipeline, the water pump and other types component) quantity of system；R0,iFor when i component damage
When it is corresponding elasticity } factor values, by formula (a) calculate；PiIt is specific by certain for the corresponding damage fraction when i component damage
Type component damage number divided by certain particular type component sum are calculated and obtained.
It is as follows the step of system Assessment of Sustainability in the present invention：
(1) sewerage system model is utilized, different threat situations (such as climate change, land use change survey) are simulated,
Acquire corresponding parameter value：Waterlogging volume, annual flow overall control rate, single contamination index such as TSS, total nitrogen, total phosphorus or its
Combined index, rainwater infiltration amount, rain water storage storage；
(2) drainage system actual conditions to be assessed are combined, the maximum of the Assessment of Sustainability metrics evaluation factor is set
And minimum value, normalized is made to evaluation points, from Min-max standardized methods, formula is as follows：
In formula, actual value is the numerical value of certain parameter, is obtained by modeling or as obtained by calculating；Minimum value, for letter
Just count, take zero (if multiple schemes, also can be by project plan comparison, with reference to actual value lower limit value)；Maximum, waterlogging volume
Maximum value with reference to the total waterlogging bulking value of system (the present drainage system rule being not provided with low influence development facility scene
Meter is delineated, the low influence exploitation of warp-wise, the transformation of sustainable direction)；Contamination control rate maximum is set to 0.9, other specification
Maximum set with reference to actual value (due in drainage system planning and designing, general more than one scheme, so with reference to multi-scheme
Actual value upper limit value；When only single scheme, actual value upper limit value is directly referred to, and control in actual value upper limit value
Less than 2 times).
(3) measurement index { society } is calculated, its calculation formula is：
ISo=1-IF(d)；
In formula, ISoFor { society } index, ISoIt is bigger, show that the social effect of system is better；IFFor normalized waterlogging body
Product, is calculated by modeling and normalization formula (c) and obtained；
(4) measurement index { economic } is calculated, its calculation formula is as follows：
IEc=[(1-IC1)(1-IC2)]1/2(e)；
In formula, IEcFor { economical } index, IEcIt is bigger, show that the economic effect of system is better；IC1Made for normalized system
Valency, IC2For normalized system maintenance operating cost, IC1And IC2It is specific to combine system under evaluation cost design and formula (c) meter
Obtain；
(5) measurement index { environment } is calculated, its calculation formula is as follows：
IEn=(IK·IS)1/2(f)；
In formula, IEnFor { environment } index, IEnIt is bigger, show that system is better to the effect of environment；IKFor normalized pollution
Control rate, can be represented, or represented with single contamination index such as TSS, total nitrogen, total phosphorus or combined index by annual flow overall control rate
(can be calculated and obtained by modeling and normalization formula (c))；ISFor normalized rainwater utilization amount, by rainwater infiltration amount and
Rainwater storage amount is calculated, and rainwater infiltration amount and rain water storage storage can be calculated by modeling and normalization formula (c) and obtained；
(6) measurement index { sustainability } is calculated, its calculation formula is as follows：
S=(ISo·IEc·IEn)1/3(g)；
In formula, S is { sustainability } index, and S is bigger, represents that the sustainability of drainage system is better；ISoRefer to for { society }
Mark, is calculated by formula (d)；IEcFor { economic } index, calculated by formula (e)；IEnCalculated for { environment } index by formula (f).
Step 3: by integrated formula, the performance index for obtaining drainage system is calculated, the drainage system performance index
Calculation formula is：
PI=(RS)1/2(h)；
In formula, PI is systematic function index, and PI is bigger, represents that the performance of drainage system is better；R is that { system resilience } refers to
Mark, is calculated by formula (b)；S is { sustainability } index, is calculated by formula (g).
Sustainability is the channeling direction of drainage system planning and designing, and the flexibility analysis of system, then could be aware that system
To the response recovery capability of different threats (climate change, Pipeline damage etc.), reply can be formulated according to the elastic situation of system
Strategy, to adapt to uncertain future.Therefore, in order to tackle the difference threat such as climate change, pipeline fault, for draining system
System, it is considered to which integrated system elasticity and Assessment of Sustainability are significant.Sewerage system performance is usual in the prior art
It is estimated according only to hydraulic performance (index such as ponding volume, ponding last, depth of accumulated water etc.), due to failing to consider to threaten,
Its evaluation result differs greatly with result of practical application, and the theoretical direction to drainage system planning and designing is not good enough.The present invention is integrated
System resilience is assessed and sustainable assessment, is not only considered that system failure etc. is different and is threatened, and considers the cost of system, maintenance fortune
Row expense, environment, social effect etc., are assessed more fully；It is right by quantitative approach simultaneously by sewerage system model
Drainage system performance carries out Comprehensive Assessment, so as to ensure the accuracy of assessment result, and considers that drainage system operation may
The situation (such as component failures) of appearance, therefore, it is possible to be preferably applied to instruct the planning and designing of sewerage system, is conducive to
Design the sewerage system of more elasticity and sustainability.
Although TahmasebiBirgani Y.etal. (2013) and Casal-Camposetal. (2015) are integrated with bullet
Property and sustainability, but its index, method are different, and in this two documents multiple index importances quantization method it is also different,
TahmasebiBirgani Y.etal. (2013) are used using analytic hierarchy process (AHP) (AHP), Casal-Camposetal. (2015)
The method of weighting (swing weighting) is swung, both approaches have certain subjectivity all by expert opinion.This
Invention gives the measurement factor with metrizability for society, environmental index, it is ensured that the operability of assessment and objective
Property；Measurement index { economic }, { environment }, { sustainability } and drainage system performance index are entered using the method for the present invention simultaneously
Row, which is calculated, to be assessed, and the subjectivity of artificial setting evaluation criterion weight can also be prevented effectively from, so as to ensure the accurate of result of calculation
Property, objectivity, and then advantageously ensure that the accuracy of sewerage system Performance Evaluation, objectivity, can be preferably applied to refer to
Lead the design and optimization of sewerage system.
To further appreciate that present disclosure, in conjunction with specific embodiment, the present invention is described in detail.
Embodiment 1
The present embodiment is newly-designed low to certain using the method for the present invention with reference to Fig. 1 using Chizhou City, Anhui Province as background
Influence exploitation drainage system A, which carries out, to be assessed.
The relevant evaluation factor is determined first, and the evaluation points that the present embodiment is determined are：{ system resilience, waterlogging volume, makes
Valency, operation and maintenance cost, contamination control rate, rainwater utilization amount }.
By sewerage system model, carry out system resilience and assess：The present embodiment considers that different threaten is system pipeline
Failure (0%-100%) is damaged, modeling is carried out.Elasticity is calculated according to formula (a), as a result as shown in Fig. 2 according to formula
(b) computing system elasticity, as a result for：R=0.592.
By sewerage system model, carry out Assessment of Sustainability：The present embodiment is counted to be easy, and climate change is not considered
Deng threat.By sewerage system model, the value of the relevant evaluation factor is obtained, (the present embodiment drainage system has as shown in table 1
3 designs, 1 column data of table comes from design first).
The value of the relevant evaluation factor of table 1
With reference to drainage system actual conditions to be assessed, the maximum and minimum value of evaluation points are set.Minimum value, in order to
Simplicity meter, the present embodiment takes zero.Maximum, the maximum reference of waterlogging volume is not provided with low influence development facility scene
The total waterlogging bulking value of system (when the present embodiment is without low influence development facility, the total waterlogging bulking value 30000m of system3).Contamination control
Rate maximum is set to 0.9, and other specification then refers to actual value upper limit value, controls below 2 times.As shown in table 2.(cost
Set higher with maintenance cost maximum, be because in unlisted other 2 designs, there is cost and maintenance cost difference
Beyond 162,000,000 yuan and 31.9 ten thousand yuan).
The maximum and minimum value of the relevant evaluation factor of table 2
According to formula (c)-(f), evaluation points are made with normalized, and parameter { society }, { economical }, { ring
Border }, be as a result respectively：ISo=0.756；IEc=0.427；IEn=0.965.
According to formula (g), the sustainability index of computing system, as a result for：S=0.678.
Finally, according to integrated formula (h), the performance index of computing system, as a result for：PI=0.633.
Performance evaluation result more than, it will be appreciated that the performance in terms of the drainage system performance indications, system A's
{ environment } index is fine, but { economic } index is relatively low, and planning and design scheme also has improvement space.
Claims (6)
1. a kind of sewerage system performance estimating method, it is characterised in that：This method integrated system elasticity is assessed and sustainable
Property assess, to sewerage system performance carry out Comprehensive Assessment, specifically include following steps：
Step 1: determining system resilience evaluation index and Assessment of Sustainability index, and weigh the factor of each index；
Step 2: using sewerage system model, above-mentioned factor values are calculated, and calculating obtains corresponding evaluation index value；
Step 3: by integrated formula, calculating the performance index for obtaining drainage system.
2. a kind of sewerage system performance estimating method according to claim 1, it is characterised in that：Weigh system resilience
Index be：{ system resilience }, the factor of measurement index { system resilience } is：{ elasticity }；The index of measurement system sustainability
For：{ society, economical, environment }, the factor of measurement index { society } is：{ system waterlogging volume }；Measurement index { economic } because
Son is：{ system cost, system operation maintenance cost }；The factor of measurement index { environment } is：{ contamination control rate, rainwater utilization
Amount }.
3. a kind of sewerage system performance estimating method according to claim 2, it is characterised in that the system resilience
That assesses comprises the following steps that：
(1) from hydraulic performance angle, using sewerage system model, extreme rain fall or component of a system failure are simulated
Situation, obtains corresponding parameter value：Waterlogging volume, waterlogging lasts, into the runoff cumulative volume of system, and total simulation lasts；
(2) calculate and weigh the factor { elasticity }, its calculation formula is as follows：
<mrow>
<msub>
<mi>R</mi>
<mn>0</mn>
</msub>
<mo>=</mo>
<mn>1</mn>
<mo>-</mo>
<mfrac>
<mi>F</mi>
<msub>
<mi>V</mi>
<mrow>
<mi>t</mi>
<mi>i</mi>
</mrow>
</msub>
</mfrac>
<mo>&times;</mo>
<mfrac>
<mi>D</mi>
<msub>
<mi>t</mi>
<mi>n</mi>
</msub>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mi>a</mi>
<mo>)</mo>
</mrow>
<mo>;</mo>
</mrow>
In above formula, R0For { elasticity } factor, scope is [0,1], for a certain specific scene, and 0 represents that elasticity is very low, and 1 represents bullet
Property is very high；F is the total waterlogging volume of system, for the summation of all node waterlogging volumes；D is average interior for all waterlogging nodes in system
Flood lasts；VtiTo enter the runoff cumulative volume of system；tnAlways simulate and last for system；
(3) measurement index { system resilience } is calculated, its calculation formula is：
<mrow>
<mi>R</mi>
<mo>=</mo>
<msubsup>
<mi>&Sigma;</mi>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>n</mi>
</msubsup>
<mo>&lsqb;</mo>
<mrow>
<mo>(</mo>
<msub>
<mi>R</mi>
<mrow>
<mn>0</mn>
<mo>,</mo>
<mi>i</mi>
<mo>+</mo>
<mn>1</mn>
</mrow>
</msub>
<mo>+</mo>
<msub>
<mi>R</mi>
<mrow>
<mn>0</mn>
<mo>,</mo>
<mi>i</mi>
</mrow>
</msub>
<mo>)</mo>
</mrow>
<mo>&CenterDot;</mo>
<mrow>
<mo>(</mo>
<msub>
<mi>P</mi>
<mrow>
<mi>i</mi>
<mo>+</mo>
<mn>1</mn>
</mrow>
</msub>
<mo>-</mo>
<msub>
<mi>P</mi>
<mi>i</mi>
</msub>
<mo>)</mo>
</mrow>
<mo>/</mo>
<mn>2</mn>
<mo>&rsqb;</mo>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mi>b</mi>
<mo>)</mo>
</mrow>
<mo>;</mo>
</mrow>
In above formula, R is { system resilience } index, and R is bigger, represents elastic better, the adaptation in specific threat of drainage system
Ability is stronger, recovers faster；I is the number of components of system failure；N is the total the number of components of system；R0,iFor when i component
{ elasticity } factor values corresponding during damage, are calculated by formula (a)；PiFor the corresponding damage fraction when i component damage, by certain
Particular type component damage number divided by certain particular type component sum are calculated and obtained.
4. a kind of sewerage system performance estimating method according to claim 2, it is characterised in that the system can be held
The step of continuous property is assessed is as follows：
(1) sewerage system model is utilized, the rainfall in the case of different threats is simulated, acquires corresponding parameter value：Waterlogging
Volume, annual flow overall control rate, single contamination index or pollution combined index, rainwater infiltration amount, rain water storage storage；
(2) drainage system actual conditions to be assessed are combined, the maximum and most of the Assessment of Sustainability metrics evaluation factor is set
Evaluation points are made normalized by small value, and from Min-max standardized methods, formula is as follows：
In formula, actual value is the numerical value of certain parameter, is obtained by modeling or as obtained by calculating；Minimum value takes zero or taken multiple
The actual value lower limit value of scheme；Maximum, waterlogging volume value, with reference to the system being not provided with low influence development facility scene
Total waterlogging volume value；Contamination control rate maximum is set to 0.9, and the maximum of other specification is set with reference to actual value.
(3) measurement index { society } is calculated, its calculation formula is：
ISo=1-IF(d)；
In formula, ISoFor { society } index, ISoIt is bigger, show that the social effect of system is better；IFFor normalized waterlogging volume, by
Modeling and normalization formula (c), which are calculated, to be obtained；
(4) measurement index { economic } is calculated, its calculation formula is as follows：
IEc=[(1-IC1)(1-IC2)]1/2(e)；
In formula, IEcFor { economical } index, IEcIt is bigger, show that the economic effect of system is better；IC1For normalized system cost,
IC2For normalized system maintenance operating cost；
(5) measurement index { environment } is calculated, its calculation formula is as follows：
IEn=(IK·IS)1/2(f)；
In formula, IEnFor { environment } index, IEnIt is bigger, show that system is better to the effect of environment；IKFor normalized contamination control
Rate, can be represented by annual flow overall control rate, or be represented with single contamination index or pollution combined index；ISFor normalized rain
Water usage, is calculated by rainwater infiltration amount and rainwater storage amount, rainwater infiltration amount and rain water storage storage is by modeling and returns
One, which changes formula (c), calculates acquisition；
(6) measurement index { sustainability } is calculated, its calculation formula is as follows：
S=(ISo·IEc·IEn)1/3(g)；
In formula, S is { sustainability } index, and S is bigger, represents that the sustainability of drainage system is better；ISoFor society } index, by
Formula (d) is calculated；IEcFor { economic } index, calculated by formula (e)；IEnCalculated for { environment } index by formula (f).
5. a kind of sewerage system performance estimating method according to claim 4, it is characterised in that：When drainage system planning
When there is multiple schemes in design, the parameter maximum in formula (c) refers to the parameter actual value upper limit value in multiple schemes；
When only single scheme, parameter maximum directly refers to actual value upper limit value, and control is at 2 times of actual value upper limit value
Below.
6. a kind of sewerage system performance estimating method according to any one of claim 1-5, it is characterised in that：It is described
The calculation formula of drainage system performance index is：
PI=(RS)1/2(h)；
In formula, PI is systematic function index, and PI is bigger, represents that the performance of drainage system is better；R is { system resilience } index, by
Formula (b) is calculated；S is { sustainability } index, is calculated by formula (g).
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