CN107292527B - Urban drainage system performance evaluation method - Google Patents
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Abstract
The invention discloses a performance evaluation method for an urban drainage system, and belongs to the technical field of urban drainage. The method integrates system elasticity evaluation and sustainability evaluation, and comprises the following specific steps: (1) determining a system elasticity evaluation index and a sustainability evaluation index, and a factor for measuring each index; (2) calculating the factor values by using an urban drainage system model, and calculating corresponding index values according to a formula; (3) and calculating the performance index of the drainage system through an integrated formula. The method can evaluate the performance of the urban drainage system, and the system elasticity and sustainability under different threats (extreme rainfall, member faults and the like), has more accurate and objective evaluation results and strong operability, and can better assist the planning and design of the drainage system.
Description
Technical Field
The invention belongs to the technical field of urban drainage, and particularly relates to a method for evaluating the performance of an urban drainage system.
Background
The urban drainage system is a group (split system rainwater system or combined system) formed by combining facilities for collecting, conveying, treating, regenerating and disposing sewage and rainwater in a certain way, and urban inland inundation frequently occurs under the background of global climate change and urbanization. The urban drainage system is an important component for urban waterlogging prevention and treatment, and the performance of the urban drainage system is important for the use of the urban waterlogging prevention and treatment, so that the evaluation of the performance of the urban drainage system has important significance.
How does system performance evaluate? At present, the research on the performance evaluation of the drainage system is basically carried out from hydraulic performance (hydraulic performance), and according to different situations (different reproduction periods, rain types and the like), by means of model simulation or computational analysis, some indexes such as accumulated water volume, accumulated water duration, accumulated water depth and the like are obtained, and then the performance of the drainage system is evaluated according to the parameters. However, most of the existing urban drainage system performance evaluation methods have the following defects: one is the resilience of the system without taking into account different threats (e.g. component failure); secondly, the sustainability of the system is not considered, so that the performance of the urban drainage system is difficult to judge truly by the existing evaluation method.
The system elasticity refers to the capability of the system to respond and recover to the threats (extreme rainfall, component damage and the like) under the condition of extreme rainfall (such as one-hundred-year-old rainfall) or system component faults (such as pipeline damage, rainwater port blockage, pump faults and the like). Mugumeet al (2015) carries out research on an elasticity analysis method of a drainage system, calculates quantitative elasticity by adopting four indexes of total waterlogging volume, total inflow volume, average waterlogging time and simulation time, and analyzes the elasticity value of the drainage system of 0% -100% of pipeline damage (the elasticity is reduced along with the increase of the pipeline damage proportion). Tahmasebibergani y.etal. (2013) quantifies system elasticity using two indicators, waterlogging volume and recovery time. The elasticity indicators in Casal-camposital (2015) include 5 categories: the elasticity quantification of each category is different, such as pipeline waterlogging, river dissolved oxygen, river ammonia nitrogen, combined system overflow and river flood, if the pipeline waterlogging is quantified by two indexes of waterlogging volume and waterlogging duration, and the river dissolved oxygen is quantified by two indexes of annual minimum concentration and duration. The latter two documents take into account climate change etc. but do not take into account the threat of component damage (pipe damage etc.), and therefore have a large error in the elastic assessment of municipal drainage performance.
The system sustainability means that social, economic and environmental index benefits are maximized under the condition that the system maintains service standards. However, for the needs of research, the primary indicators of the sustainability of the drainage system are not limited to social, economic and environmental aspects. The first-level index, the second-level index (parameter) and the calculation method are different due to different research purposes, different objects and the like. The Tahmasebibergani Y.etal (2013) takes three aspects of traditional society, economy and environment into consideration, the second-level indexes respectively adopt aesthetic benefit, manufacturing cost, maintenance cost and rainwater quality, and the quantitative parameters are the capacity (high/medium/low) for beautifying the city, the construction cost ($) and maintenance cost ($/year) for optimal management measures and total suspended solids (Kg). Casal-Camposeal (2015) sustainability primary indexes include pipeline waterlogging, river dissolved oxygen, river ammonia nitrogen, combined overflow, river flood, energy utilization, cost and acceptability, and parameters are respectively influenced loss (£ 6h minimum (mg/l) and influence on aquatic resources]) Influence on aquatic resources ([ 99% ile (mg/l))]) The overflow affects the beauty and health, the affected loss (£), the CO during operation2Emission (ton), life cycle cost (£ t), high/medium/low.
Therefore, the system elasticity and sustainability are brought into the evaluation factor range of the urban drainage system performance, and the method has important significance for accurate and objective judgment of the urban drainage system performance, so that the optimal design of the urban drainage system can be better guided.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to overcome the defect that the performance of an urban drainage system is difficult to judge really by adopting the existing urban drainage system performance evaluation method, and provides the urban drainage system performance evaluation method. The system integrates the system elasticity evaluation and the sustainable evaluation, and comprehensively evaluates the performance of the drainage system by a quantitative method by means of the urban drainage system model, so that the accuracy and the objectivity of the performance evaluation of the urban drainage system can be effectively ensured, and the system can be better used for guiding the optimization design of the urban drainage system.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention discloses a performance evaluation method of an urban drainage system, which integrates system elasticity evaluation and sustainability evaluation and carries out comprehensive evaluation on the performance of the urban drainage system, and specifically comprises the following steps:
step one, determining a system elasticity evaluation index and a sustainability evaluation index, and measuring factors of each index;
calculating the factor value by using an urban drainage system model, and calculating to obtain a corresponding evaluation index value;
and step three, calculating to obtain the performance index of the drainage system through an integrated formula.
Further, the indexes for measuring the elasticity of the system are as follows: { system elasticity }, the factor measuring the index { system elasticity } is: { elasticity }; the indexes for measuring the system sustainability are as follows: the factors of the { society, economy, environment }, and the measurement indexes { society } are: { volume of system waterlogging }; the factors for the metrics { economy } are: { system cost, system operation maintenance cost }; the factors for the metric { environment } are: { pollution control rate, rainwater utilization }.
Further, the specific steps of the system elasticity evaluation are as follows:
(1) from the perspective of hydraulic performance, an urban drainage system model is utilized to simulate extreme rainfall conditions or system component fault conditions, and corresponding parameter values are obtained: the total volume of runoff entering the system is determined according to the waterlogging volume and the waterlogging duration, and the total simulation duration is determined;
(2) and calculating the weighing factor { elasticity }, wherein the calculation formula is as follows:
in the above formula, R0Is { elastic } factor in the range of [0,1]For a particular scenario, 0 means very low elasticity, and 1 means very high elasticity; f is the total waterlogging volume of the system, which is the sum of the waterlogging volumes of all nodes; d is the average waterlogging duration of all waterlogging nodes in the system; vtiIs the total volume of runoff entering the system; t is tnThe total simulation duration for the system;
(3) and calculating a measurement index { system elasticity }, wherein the calculation formula is as follows:
in the formula, R is a { system elasticity } index, the larger R is, the better the elasticity of the drainage system is, and the stronger the adaptability in a specific threat is, the faster the recovery is; i is the number of components damaged by the system; n is the total number of components of the system; r0,iIs the corresponding { elasticity } factor value when i members are damaged, calculated by formula (a); piThe damage score corresponding to the damage of the i components is calculated by dividing the damage number of the components of a certain type by the total number of the components of the certain type.
Further, the system sustainability assessment steps are as follows:
(1) the method comprises the following steps of simulating extreme rainfall conditions or system component fault conditions by utilizing a city drainage system model to obtain corresponding parameter values: the volume of waterlogging, the total annual runoff control rate, single pollution indexes such as TSS, total nitrogen, total phosphorus or the combination indexes thereof, rainwater infiltration capacity and rainwater storage capacity;
(2) setting the maximum value and the minimum value of the evaluation factor of the sustainability evaluation index by combining the actual condition of the drainage system to be evaluated, carrying out normalization processing on the evaluation factor, and selecting a Min-max standardization method, wherein the formula is as follows:
in the formula, the actual value is a numerical value of a certain parameter and is obtained by model simulation or calculation; taking zero as the minimum value or taking the lower limit value of the actual values of a plurality of schemes; taking a maximum value, namely taking a waterlogging volume value, and taking a total waterlogging volume value of the system under the condition that the low-influence development facility is not set as a reference; the maximum value of the pollution control rate is set to be 0.9, and the maximum values of other parameters are set by referring to an actual value;
(3) and (3) calculating a measurement index { society }, wherein the calculation formula is as follows:
ISo＝1-IF(d)；
in the formula ISoIs { social } index, ISoThe larger the size, the better the social effect of the system; i isFCalculating the normalized waterlogging volume by using a model simulation and a normalization formula (c);
(4) and (3) calculating a measurement index { economy }, wherein the calculation formula is as follows:
IEc＝[(1-IC1)(1-IC2)]1/2(e)；
in the formula IEcIs { economic } index, IEcThe larger the size, the better the economic efficiency of the system; i isC1For normalized system cost, IC2Maintaining operating costs for the normalized system;
(5) and calculating the measurement index { environment }, wherein the calculation formula is as follows:
IEn＝(IK·IS)1/2(f)；
in the formula IEnIs the index of the environment,IEnthe larger the size, the better the system is effective on the environment; i isKFor normalized pollution control rates, it can be expressed as a total annual runoff control rate, or as a single pollution indicator such as TSS, total nitrogen, total phosphorus, or a combination indicator; i isSCalculating the rainwater infiltration amount and the rainwater storage amount for the normalized rainwater utilization amount (which can be obtained by model simulation and normalization formula (c));
(6) and calculating a measure { sustainability }, wherein the calculation formula is as follows:
S＝(ISo·IEc·IEn)1/3(g)；
wherein S is a { sustainability } index, and the larger S is, the better the sustainability of the drainage system is; i isSoIs { social } index, calculated by formula (d); i isEcIs { economic } index, calculated by formula (e); i isEnThe index { environment } is calculated by equation (f).
Furthermore, when a plurality of schemes exist in the planning design of the drainage system, the maximum value of the parameter in the formula (c) refers to the upper limit value of the actual value of the parameter in the plurality of schemes; when only a single scheme exists, the maximum value of the parameter directly refers to the upper limit value of the actual value and is controlled to be less than 2 times of the upper limit value of the actual value.
Further, the calculation formula of the drainage system performance index is as follows:
PI＝(R·S)1/2(h)；
in the formula, PI is a system performance index, and the larger the PI is, the better the performance of the drainage system is; r is { system elasticity } index, calculated by formula (b); s is a { sustainability } indicator, calculated by equation (g).
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) according to the urban drainage system performance evaluation method, system elasticity evaluation and sustainable evaluation are integrated, the urban drainage system performance is comprehensively evaluated through a quantitative method by means of an urban drainage system model, the evaluation result is more accurate, and the actual operation conditions (such as component faults and the like) of the drainage system are considered, so that the method can be better used for guiding the optimization and design of the urban drainage system, and is beneficial to designing the urban drainage system with better elasticity and sustainability.
(2) According to the urban drainage system performance evaluation method, the measurement factor with measurability is given according to social and environmental indexes, and the operability and objectivity of evaluation are guaranteed; meanwhile, the evaluation formulas of the { economy }, { environment }, { sustainability } and the drainage system performance index are optimized, so that the subjectivity of manually setting evaluation index weight can be effectively avoided, and the accuracy and objectivity of the system drainage performance evaluation are further ensured.
Drawings
FIG. 1 is a schematic diagram of indexes and factor components of the urban drainage system performance evaluation method of the invention.
Fig. 2 is the elasticity calculation result of the system elasticity evaluation in case of pipe failure (0% -100%) in example 1.
Detailed Description
The invention discloses a performance evaluation method of an urban drainage system, which integrates system elasticity evaluation and sustainability evaluation and carries out comprehensive evaluation on the performance of the urban drainage system, and specifically comprises the following steps:
step one, determining a system elasticity evaluation index and a sustainability evaluation index, and measuring factors of each index.
System resiliency assessment refers to the assessment of the system's ability to recover from response to such threats (extreme rainfall, component damage, etc.) under extreme rainfall conditions (e.g., one hundred year rainfall) or system component failures (e.g., pipe damage, gully plugging, pump failure, etc.). The system sustainability evaluation refers to the sustainability evaluation of the system under different threat situations (mainly referring to the situations of climate change and land utilization change, and not considering component failure, namely 0% of component failure).
The indexes for measuring the system elasticity in the invention are as follows: { system elasticity }, the factor measuring the index { system elasticity } is: { elasticity }; the indexes for measuring the system sustainability are as follows: the factors of the { society, economy, environment }, and the measurement indexes { society } are: { volume of system waterlogging }; the factors for the metrics { economy } are: { system cost, system operation maintenance cost }; the factors for the metric { environment } are: { pollution control rate, rainwater utilization }.
And step two, calculating the factor value by using an urban drainage system model, and calculating to obtain a corresponding evaluation index value.
The specific steps of the system elasticity evaluation in the invention are as follows:
(1) from the perspective of hydraulic performance, an urban drainage system model is utilized to simulate extreme rainfall conditions (such as one-hundred-year-round rainfall) or system component fault conditions (such as pipeline damage, rainwater inlet blockage, pump fault and the like), and corresponding parameter values are obtained: the total volume of runoff entering the system is determined according to the waterlogging volume and the waterlogging duration, and the total simulation duration is determined;
(2) and calculating the weighing factor { elasticity }, wherein the calculation formula is as follows:
in the above formula, R0Is { elastic } factor in the range of [0,1]For a certain scenario (extreme rainfall, different component damage ratios, etc.), 0 means very low elasticity, and 1 means very high elasticity; f is the total waterlogging volume of the system, which is the sum of the waterlogging volumes of all nodes; d is the average waterlogging duration of all waterlogging nodes in the system; vtiIs the total volume of runoff entering the system; t is tnThe total simulation duration for the system;
(3) and calculating a measurement index { system elasticity }, wherein the calculation formula is as follows:
in the formula, R is a { system elasticity } index, the larger R is, the better the elasticity of the drainage system is, and the stronger the adaptability in specific threats (component damage, extreme rainfall and the like) is, the faster the recovery is; i is the number of components (piping, water pumps, and other types of components) that the system is damaged; n is the general component of the system (pipes, pumps and other types of structures)Piece) number; r0,iIs the corresponding { elasticity } factor value when i members are damaged, calculated by formula (a); piThe damage score corresponding to the damage of the i components is calculated by dividing the damage number of the components of a certain type by the total number of the components of the certain type.
In the invention, the steps of system sustainability evaluation are as follows:
(1) the city drainage system model is utilized to simulate different threat conditions (such as climate change, land utilization change and the like), and corresponding parameter values are obtained: the volume of waterlogging, the total annual runoff control rate, single pollution indexes such as TSS, total nitrogen, total phosphorus or the combination indexes thereof, rainwater infiltration capacity and rainwater storage capacity;
(2) setting the maximum value and the minimum value of the evaluation factor of the sustainability evaluation index by combining the actual condition of the drainage system to be evaluated, carrying out normalization processing on the evaluation factor, and selecting a Min-max standardization method, wherein the formula is as follows:
in the formula, the actual value is a numerical value of a certain parameter and is obtained by model simulation or calculation; the minimum value is zero for simple calculation (if the scheme is multiple, the scheme can be compared, and the lower limit value of the actual value is referred); the maximum value, namely the maximum value of the waterlogging volume refers to the total waterlogging volume value of the system under the condition that the low-influence development facility is not set (the current drainage system planning design is changed to the low-influence development and sustainable direction); the maximum value of the pollution control rate is set to be 0.9, and the maximum values of other parameters are set by referring to an actual value (because in the planning design of a drainage system, more than one scheme is generally adopted, the upper limit value of the actual value of multiple schemes is referred to; when only a single scheme is adopted, the upper limit value of the actual value is directly referred to and is controlled to be less than 2 times of the upper limit value of the actual value).
(3) And (3) calculating a measurement index { society }, wherein the calculation formula is as follows:
ISo＝1-IF(d)；
in the formula ISoIs the { social } index,ISothe larger the size, the better the social effect of the system; i isFCalculating the normalized waterlogging volume by using a model simulation and a normalization formula (c);
(4) and (3) calculating a measurement index { economy }, wherein the calculation formula is as follows:
IEc＝[(1-IC1)(1-IC2)]1/2(e)；
in the formula IEcIs { economic } index, IEcThe larger the size, the better the economic efficiency of the system; i isC1For normalized system cost, IC2Maintenance operating costs for the normalized system IC1And IC2Specifically combining the design cost of the system to be evaluated and the formula (c) to obtain the evaluation result;
(5) and calculating the measurement index { environment }, wherein the calculation formula is as follows:
IEn＝(IK·IS)1/2(f)；
in the formula IEnIs { Environment } index, IEnThe larger the size, the better the system is effective on the environment; i isKFor normalized pollution control rate, it can be expressed in terms of total annual runoff control rate, or in terms of individual pollution indicators such as TSS, total nitrogen, total phosphorus, or a combination of indicators (which can be calculated from model simulations and normalization equation (c)); i isSCalculating the rainwater infiltration amount and the rainwater storage amount for the normalized rainwater utilization amount through a rainwater infiltration amount and a rainwater storage amount, wherein the rainwater infiltration amount and the rainwater storage amount can be obtained by model simulation and a normalization formula (c);
(6) and calculating a measure { sustainability }, wherein the calculation formula is as follows:
S＝(ISo·IEc·IEn)1/3(g)；
wherein S is a { sustainability } index, and the larger S is, the better the sustainability of the drainage system is; i isSoIs { social } index, calculated by formula (d); i isEcIs { economic } index, calculated by formula (e); i isEnThe index { environment } is calculated by equation (f).
Step three, calculating to obtain a performance index of the drainage system through an integrated formula, wherein the calculation formula of the performance index of the drainage system is as follows:
PI＝(R·S)1/2(h)；
in the formula, PI is a system performance index, and the larger the PI is, the better the performance of the drainage system is; r is { system elasticity } index, calculated by formula (b); s is a { sustainability } indicator, calculated by equation (g).
Sustainability is a guide direction of the drainage system planning design, and the elastic analysis of the system can know the response recovery capability of the system to different threats (climate change, pipeline damage and the like), and can make a coping strategy according to the elastic condition of the system so as to adapt to the uncertain future. Therefore, in order to cope with different threats such as climate change, pipeline failure and the like, it is important to consider the integrated system elasticity and sustainability evaluation for the drainage system. In the prior art, the performance of an urban drainage system is usually evaluated only according to hydraulic performance (indexes such as accumulated water volume, accumulated water duration, accumulated water depth and the like), and because threats cannot be considered, the evaluation result is greatly different from the actual application result, and the theoretical guidance of the planning design of the drainage system is not good enough. The system integrates the elastic evaluation and the sustainable evaluation of the system, not only considers different threats such as system faults and the like, but also considers the cost, the maintenance and operation cost, the environment, the social effect and the like of the system, and the evaluation is more comprehensive; meanwhile, the performance of the drainage system is comprehensively evaluated by means of a urban drainage system model and a quantitative method, so that the accuracy of an evaluation result can be ensured, and the conditions (such as component faults and the like) which possibly occur in the operation of the drainage system are considered, so that the method can be better used for guiding the planning and design of the urban drainage system, and is favorable for designing the urban drainage system with better elasticity and sustainability.
Although tahmasebibergani y.et. (2013) and Casal-camposital. (2015) both integrate elasticity and sustainability, indexes and methods thereof are different, and quantification methods of importance of a plurality of indexes in the two documents are also different, the tahmasebibergani y.et. (2013) adopts an Analytic Hierarchy Process (AHP), and the Casal-camposital. (2015) adopts a swing weighting method (swerving weighting), and both methods are evaluated by experts, so that certain subjectivity exists. According to the invention, a measurement factor with scalability is provided for social and environmental indexes, so that the operability and objectivity of evaluation are ensured; meanwhile, the method is adopted to calculate and evaluate the measurement indexes { economy }, { environment }, { sustainability } and the drainage system performance index, and the subjectivity of manually setting and evaluating the index weight can be effectively avoided, so that the accuracy and objectivity of the calculation result are ensured, the accuracy and objectivity of the urban drainage system performance evaluation are further ensured, and the method can be better used for guiding the design and optimization of the urban drainage system.
For a further understanding of the invention, reference will now be made in detail to specific embodiments of the invention.
Example 1
In this embodiment, the method of the present invention is used to evaluate a newly designed low impact development drainage system a with the background of the pool state of Anhui province and with reference to fig. 1.
First, a relevant evaluation factor is determined, and the evaluation factor determined in this embodiment is: { system elasticity, waterlogging volume, construction cost, operation maintenance cost, pollution control rate, and rainwater utilization }.
And (3) carrying out system elasticity evaluation by means of a city drainage system model: in the embodiment, model simulation is carried out by considering different threats as system pipeline damage faults (0% -100%). The elasticity is calculated according to formula (a) and the result is shown in fig. 2, and the system elasticity is calculated according to formula (b) and the result is: r ═ 0.592.
With the aid of the urban drainage system model, sustainability assessments were developed: the embodiment is simple and convenient, and does not consider threats such as climate change and the like. With the aid of the municipal drainage system model, values of the relevant evaluation factors were obtained as shown in table 1 (the drainage system of this example had 3 design solutions, and the data listed in table 1 are from design solution a).
TABLE 1 values of the relevant evaluation factors
And setting the maximum value and the minimum value of the evaluation factor according to the actual condition of the drainage system to be evaluated. Minimum value, for simplicity, thisThe examples all take zero. Maximum value, the maximum value of the total waterlogging volume of the system under the circumstance that the low-influence development facility is not set (when the low-influence development facility is not provided in the embodiment, the total waterlogging volume of the system is 30000m3). The maximum value of the pollution control rate is set to be 0.9, and other parameters are controlled to be below 2 times by referring to the upper limit value of the actual value. As shown in table 2. (the maximum value of the manufacturing cost and the maintenance cost is set higher because the manufacturing cost and the maintenance cost respectively exceed 16200 ten thousand yuan and 31.9 ten thousand yuan in other 2 design schemes which are not listed).
TABLE 2 maximum and minimum values of the correlation evaluation factors
According to the formulas (c) - (f), the evaluation factors are normalized, indexes { social }, { economic }, and { environmental }, are calculated, and the results are respectively: i isSo＝0.756；IEc＝0.427；IEn＝0.965。
According to equation (g), a sustainability indicator for the system is calculated, with the result: s is 0.678.
Finally, according to the integration formula (h), calculating the performance index of the system, and the result is: PI is 0.633.
Through the performance evaluation results, the performance of the drainage system in terms of performance indexes can be known, the { environment } index of the system A is good, but the { economic } index is relatively low, and the planning design scheme has an improvement space.
Claims (2)
1. A performance evaluation method of an urban drainage system is characterized by comprising the following steps: the method integrates system elasticity evaluation and sustainability evaluation, and comprehensively evaluates the performance of the urban drainage system, and specifically comprises the following steps:
step one, determining a system elasticity evaluation index and a sustainability evaluation index, and measuring factors of each index; the indexes for measuring the elasticity of the system are as follows: { system elasticity }, the factor measuring the index { system elasticity } is: { elasticity }; the indexes for measuring the system sustainability are as follows: the factors of the { society, economy, environment }, and the measurement indexes { society } are: { volume of system waterlogging }; the factors for the metrics { economy } are: { system cost, system operation maintenance cost }; the factors for the metric { environment } are: { pollution control rate, rainwater utilization };
calculating the factor value by using an urban drainage system model, and calculating to obtain a corresponding evaluation index value; the specific steps of the system elasticity evaluation are as follows:
(1) from the perspective of hydraulic performance, an urban drainage system model is utilized to simulate extreme rainfall conditions or system component fault conditions, and corresponding parameter values are obtained: the total volume of runoff entering the system is determined according to the waterlogging volume and the waterlogging duration, and the total simulation duration is determined;
(2) and calculating the weighing factor { elasticity }, wherein the calculation formula is as follows:
in the above formula, R0Is { elastic } factor in the range of [0,1]For a particular scenario, 0 means very low elasticity, and 1 means very high elasticity; f is the total waterlogging volume of the system, which is the sum of the waterlogging volumes of all nodes; d is the average waterlogging duration of all waterlogging nodes in the system; vtiIs the total volume of runoff entering the system; t is tnThe total simulation duration for the system;
(3) and calculating a measurement index { system elasticity }, wherein the calculation formula is as follows:
in the formula, R is a { system elasticity } index, the larger R is, the better the elasticity of the drainage system is, and the stronger the adaptability in a specific threat is, the faster the recovery is; i is the number of components damaged by the system; n is the total number of components of the system; r0,iIs the corresponding { elasticity } factor value when i members are damaged, calculated by formula (a); piDividing the damage number of a specific type of component by the damage number of the specific type of component to obtain the corresponding damage score when i components are damagedCalculating the total number of the components;
the steps of the system sustainability assessment are as follows:
(1) simulating rainfall under different threat conditions by using a city drainage system model to obtain corresponding parameter values: the volume of waterlogging, the total annual runoff control rate, a single pollution index or a pollution combination index, the rainwater infiltration capacity and the rainwater storage capacity;
(2) setting the maximum value and the minimum value of the evaluation factor of the sustainability evaluation index by combining the actual condition of the drainage system to be evaluated, carrying out normalization processing on the evaluation factor, and selecting a Min-max standardization method, wherein the formula is as follows:
in the formula, the actual value is a numerical value of a certain parameter and is obtained by model simulation or calculation; taking zero as the minimum value or taking the lower limit value of the actual values of a plurality of schemes; taking a maximum value, namely taking a waterlogging volume value, and taking a total waterlogging volume value of the system under the condition that the low-influence development facility is not set as a reference; the maximum value of the pollution control rate is set to be 0.9, and the maximum values of other parameters are set by referring to an actual value;
(3) and (3) calculating a measurement index { society }, wherein the calculation formula is as follows:
ISo＝1-IF(d)；
in the formula ISoIs { social } index, ISoThe larger the size, the better the social effect of the system; i isFCalculating the normalized waterlogging volume by using a model simulation and a normalization formula (c);
(4) and (3) calculating a measurement index { economy }, wherein the calculation formula is as follows:
IEc＝[(1-Ic1)(1-Ic2)]1/2(e)；
in the formula IEcIs { economic } index, IEcThe larger the size, the better the economic efficiency of the system; i isC1For normalized system cost, IC2Maintaining operating costs for the normalized system;
(5) and calculating the measurement index { environment }, wherein the calculation formula is as follows:
IEn＝(IK·IS)1/2(f)；
in the formula IEnIs { Environment } index, IEnThe larger the size, the better the system is effective on the environment; i isKThe normalized pollution control rate can be expressed by the total annual runoff control rate or a single pollution index or a pollution combination index; i isSCalculating the rainwater infiltration amount and the rainwater storage amount for the normalized rainwater utilization amount through a model simulation and a normalization formula (c);
(6) and calculating a measure { sustainability }, wherein the calculation formula is as follows:
S＝(ISo·IEc·IEn)1/3(g)；
wherein S is a { sustainability } index, and the larger S is, the better the sustainability of the drainage system is; i isSoIs { social } index, calculated by formula (d); i isEcIs { economic } index, calculated by formula (e); i isEnIs calculated by equation (f);
calculating to obtain a performance index of the drainage system through an integrated formula; the calculation formula of the drainage system performance index is as follows:
PI＝(R·S)1/2(h)；
in the formula, PI is a system performance index, and the larger the PI is, the better the performance of the drainage system is; r is { system elasticity } index, calculated by formula (b); s is a { sustainability } indicator, calculated by equation (g).
2. The urban drainage system performance evaluation method according to claim 1, wherein: when a plurality of schemes exist in the planning design of the drainage system, the maximum value of the parameter in the formula (c) refers to the upper limit value of the actual value of the parameter in the plurality of schemes; when only a single scheme exists, the maximum value of the parameter directly refers to the upper limit value of the actual value and is controlled to be less than 2 times of the upper limit value of the actual value.
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