A method for calculating a comprehensive rain peak coefficient of Chicago rain type based on geometric shape of rainstorm process

Abstract

The application provides a Chicago rain type comprehensive rain peak coefficient calculation method based on a storm process geometric shape, and aims to solve the theoretical basis and calculation method system of Chicago rain type analysis in urban outdoor drainage design. The method calculates the comprehensive rain peak position coefficient of different rainfall durations by statistically analyzing the rain peak position coefficient of the rainfall duration and combining the same frequency characteristics of the Chicago rain type, so that the calculation method based on the previous stage influence rainfall and rainfall duration weight of the traditional method is optimized. The method not only improves the efficiency of rainwater design work, but also adapts to the trend of improving the urban drainage and waterlogging prevention standard, and has important practical value and theoretical significance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of outdoor drainage design, and particularly relates to a Chicago rain type comprehensive rain peak coefficient calculation method based on a geometric shape of a rainstorm process. BACKGROUND

[0002] Design rainstorm rain type analysis is the basis of urban outdoor drainage design work, and the core lies in reasonable planning of time distribution of total rainfall. As a classic model rain type, the Chicago method rain type (Keifer and Chu rain type) has been widely used in China due to its advantages of being based on a rainstorm intensity formula and having the same frequency for different duration design rainfalls. For example, in the national standard specifications such as the “Outdoor Drainage Design Standard” (GB50014-2021) and the “Technical Guidelines for Compilation of Urban Rainstorm Intensity Formula and Determination of Design Rain Type”, it is clearly required that the determination of short duration rainstorm rain type should adopt the Chicago method. According to the instantaneous rain intensity formula of the Chicago method rain type, the calculation of the design rainstorm process is determined by the parameters of the rainstorm intensity formula and the rain peak coefficient. Therefore, the determination of the rain peak coefficient is the key to whether the Chicago design rain type meets the rainwater design.

[0003] For the determination of the rain peak coefficient of a single rainfall duration, the field rain peak coefficient of a typical rainstorm process is statistically determined, and after arithmetic averaging, it can be directly used for the design of the rainstorm process of the duration. For the Chicago rain type applicable to multiple rainfall durations, the rain peak coefficients of different durations need to be synthesized. At present, the commonly used method is to take the previous influence rainfall or rainfall duration as the weight to perform weighted average on the rain peak coefficients of different durations. The previous influence rainfall has a clear mechanism for the runoff process, but lacks theoretical support for the influence on the position of the rainfall peak. On the other hand, for a short duration rainstorm process, the weight of the previous influence rainfall is large; for a long duration rainstorm process, the influence is small, and even the weight is zero. This weakens the statistical value of the typical rainstorm process of the long duration, which is contrary to the increasing standards of urban drainage and waterlogging prevention in China. Taking the rainfall duration as the weight can make up for the shortcomings of the previous influence rainfall method, but due to the complexity of the rainstorm formation mechanism, the relationship between the rainstorm peak position and the duration cannot be clearly determined, which leads to the scientific basis of this method being questioned.

[0004] Therefore, under the background of frequent extreme weather and continuously improving standards of drainage and waterlogging prevention, it is necessary to propose and establish a Chicago rain type comprehensive rain peak coefficient calculation method based on the geometric shape of a rainstorm process. SUMMARY

[0005] The present application aims at overcoming the deficiencies in the prior art, and provides a Chicago rain type comprehensive rain peak coefficient calculation method based on the geometric shape of rainstorm processes, which can effectively consolidate the theoretical basis of Chicago rain type analysis, and perfect the method system for calculating and designing rainstorms and rain type analysis.

[0006] To achieve the above-mentioned purposes and effects, the present application is implemented by the following technical scheme:

[0007] In the first aspect, the present application provides a Chicago rain type comprehensive rain peak coefficient calculation method based on the geometric shape of rainstorm processes, comprising the following steps:

[0008] The annual maximum rainfall of each rainfall duration in each year is counted year by year, and the starting time, peak time and ending time are recorded, and the rain peak position coefficient is calculated to obtain the single-hour rain peak position coefficient of each year of each rainfall duration; the rainfall duration includes 30min, 60min, 90min, 120min, 150min and 180min;

[0009] The single-hour rain peak position coefficient of each year of each rainfall duration is screened to obtain the screened single-hour rain peak position coefficient of each year of each rainfall duration;

[0010] According to the screened single-hour rain peak position coefficient of each year of each rainfall duration, the arithmetic mean of the single-hour rain peak position coefficient of each rainfall duration is calculated;

[0011] According to the arithmetic mean of the single-hour rain peak position coefficient of each rainfall duration, the comprehensive rain peak position coefficient is calculated according to the following formula:

[0012]

[0013] Among them: The rainfall duration is generally 30, 60, 90, 120, 150 and 180 according to the Outdoor Drainage Design Standard; The number of rainfall durations; The arithmetic mean of the single-hour rain peak position coefficient of the rainfall duration of 180min is represented; The arithmetic mean of the single-hour rain peak position coefficient of the rainfall duration of 180min is represented; The relative rain peak position coefficient in the 180min rainfall duration design rainfall process is represented. The comprehensive rain peak position coefficient is the Chicago rain type comprehensive rain peak coefficient based on the geometric shape of rainstorm processes.

[0014] The comprehensive rain peak position coefficient is the Chicago rain type comprehensive rain peak coefficient based on the geometric shape of rainstorm processes.

[0015] ​Further, the annual maximum rainfall of each rainfall duration is calculated, and the rainfall process corresponding to the annual maximum rainfall is selected, including:

[0016] For a single rainfall duration In a year, the rainfall process corresponding to the annual maximum rainfall of the rainfall duration is selected by using a minute-by-minute sliding statistical method;

[0017] The total number of years of recording the statistical data of the rainfall of each rainfall duration is greater than or equal to 20 years.

[0018] Further, the calculation formula of the rain peak position coefficient is:

[0019]

[0020] Among them, 、 、 are the start time, the peak time and the end time, respectively.

[0021] Further, the rain peak position coefficients of each year of each rainfall duration are screened, including:

[0022] The screening is performed according to the standard that the annual maximum rainfall is less than the design rainfall with a frequency of 99%.

[0023] Further, when calculating the single-duration rain peak position coefficient, according to the Technical Guidelines for Formulating Urban Rainstorm Intensity Formula and Determining Design Rainstorm Rain Type, the single-duration rain peak position coefficients of rainfall durations of 30 min, 60 min, 90 min, 120 min, 150 min and 180 min are calculated in sequence, denoted as Among them, 30, 60, 90, 120, 150 and 180 are taken.

[0024] Further, the method further includes:

[0025] The calculated comprehensive rain peak position coefficient is substituted into the Chicago rain type instantaneous rain intensity formula , so that the Chicago design rainstorm process can be calculated.

[0026] In the formula, 、 、 、 is a design rainstorm intensity formula, which is obtained by rainstorm frequency analysis; is a design rainstorm return period, and the unit is year; is a design peak time, which is calculated by the formula ; is a rain peak segmentation ratio, when , when Time, .

[0027] In a second aspect, the present application provides a device for calculating the Chicago rain type comprehensive rain peak coefficient based on the geometric shape of the rainstorm process, comprising a processor and a storage medium;

[0028] The storage medium is used to store instructions;

[0029] The processor is used to operate according to the instructions to perform the steps of the method according to the first aspect.

[0030] In a third aspect, the present application provides a computer-readable storage medium having stored thereon a computer program, which, when executed by a processor, implements the steps of the method according to the first aspect.

[0031] Compared with the prior art, the present application has the following beneficial effects:

[0032] 1. The present application designs a Chicago rain type comprehensive rain peak coefficient calculation method based on the geometric shape ratio of the rainstorm process. Compared with the existing calculation method based on the weight of the previous influence rainfall and rainfall duration, the present application takes the relative position of the statistical duration rain peak position coefficient in the 180min duration process as the calculation principle, which overcomes the problem of weak theoretical basis of the existing method.

[0033] 2. The present application derives a comprehensive rain peak position coefficient calculation formula, . The formula can be directly applied to the design of rainstorm rain type analysis and calculation work, effectively simplifying the calculation method of the Chicago rain type comprehensive rain peak coefficient based on the geometric shape of the rainstorm process, thereby optimizing the steps of theoretical application. This innovation significantly improves the work efficiency of rainwater design workers and makes the process more convenient.

[0034] 3. In the above-mentioned comprehensive rain peak position coefficient calculation formula derived by the present application, the statistical rainfall duration The weight of the corresponding rain peak position coefficient is . The weight increases accordingly with the increase of the statistical rainfall duration, which is consistent with the trend of continuously improving the standard of urban drainage and waterlogging prevention in China. This design can effectively adapt to the needs of upgrading the standard of future urban drainage system, and reflects the forward-looking consideration of the future development of urban drainage system. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a rain peak position coefficient same frequency diagram for rainfall duration 180min;

[0036] Figure 2 is a superimposed diagram of rainfall duration and 180min design rainfall process;

[0037] Figure 3Design a geometric fusion diagram of the rainfall process for a rainfall duration of 180 minutes;

[0038] Figure 4 A time-by-time distribution diagram of a Chicago design storm with a rainfall duration of 180 minutes and a return period of 20 years in a certain city;

[0039] Figure 5 This is a flowchart for calculating the comprehensive peak rainfall coefficient of the Chicago rainfall pattern based on the geometric shape of the rainstorm process. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0041] like Figure 5 As shown, this invention provides a method for calculating the comprehensive peak rainfall coefficient of Chicago rainfall patterns based on the geometric morphology of rainstorm processes. This method effectively strengthens the theoretical foundation of Chicago rainfall pattern analysis and improves the methodology for calculating and designing rainstorms and rainfall pattern analysis. Specifically, it includes the following steps:

[0042] 1. For a single rainfall duration Within a year, using a minute-by-minute sliding statistical method, the rainfall process corresponding to the annual maximum rainfall duration is selected, and the start time, peak time, and end time are recorded as follows: , , The duration of the rainfall peak in this rainfall process is... The rain peak location coefficient is .

[0043] All settings must be statistically analyzed. T is generally not user-defined; commonly selected values ​​are 30, 60, 90, 120, 150, and 180 minutes.

[0044] 2. For rainfall data over n years, the rainfall duration should be calculated year by year using the method described above. Rainfall peak location coefficient of the maximum rainfall event Calculate the annual rain peak location coefficient r using the method in step 1. For a total of n years, this forms a time series consisting of n different rain peak location coefficients r.

[0045] According to the "Outdoor Drainage Design Standard", when the annual maximum value method is used, the total number of years of statistical data recording of rainfall for each rainfall duration is greater than or equal to 20 years.

[0046] 3. For the annual rainfall peak location coefficient Valid data for year m are selected based on certain criteria (e.g., the maximum annual rainfall is less than the design rainfall at a frequency of 99%). Therefore, for this single rainfall duration... The rain peak position coefficient is calculated by arithmetic mean, that is Where , .

[0047] For each year, the maximum rainfall process corresponds to an annual maximum rainfall (the total rainfall of the process) and a rain peak position (the peak position of the process). These are one-to-one correspondence.

[0048] The smaller the annual maximum rainfall value, the greater the frequency (here 99%) of its occurrence, and the smaller the corresponding process (rain peak position) reference value for outdoor drainage design (the minimum design return period of the storm intensity formula application scenario in the "Outdoor Drainage Design Standard" (GB50014-2021) is 2 years). Therefore, the rain peak position coefficient corresponding to the annual maximum rainfall with a frequency greater than 99% is removed to reduce the impact of invalid data.

[0049] Therefore, the rain peak position coefficient corresponding to the annual maximum rainfall with a frequency greater than 99% is removed.

[0050] In other words, the design rainfall frequency is 99%, and the rain peak position coefficient corresponding to the annual maximum rainfall greater than the threshold is retained, and the rain peak position coefficient corresponding to the annual maximum rainfall less than the threshold is removed.

[0051] This approach is reflected in existing research (Ma Jinting, Song Lili, Zhang Xiaojing. Comparison of two different sampling methods of Pilgrim & Cordery design rain type [J]. Storm Disaster, 2016, 35(3): 7. DOI: 10.3969 / j.issn.1004-9045.2015.03.004. ) The paper uses one-in-a-year as the threshold.

[0052] "Once in a year" corresponds to a frequency of 100%, which is a deterministic event, which contradicts the randomness basis of storm frequency analysis based on the annual maximum method. Therefore, in this method, it is changed to 99% frequency (the design rainfall is close to one-in-a-year in value).

[0053] 4. Repeat the above method, and calculate the single-time rain peak position coefficient according to "Technical Guidelines for Compiling Urban Storm Intensity Formulas and Determining Design Rainfall Types", with rainfall duration of 30min, 60min, 90min, 120min, 150min, 180min, respectively, denoted as Where Take 30, 60, 90, 120, 150, 180.

[0054] According to the Technical Guidelines for Formulating Urban Rainfall Intensity Formula and Determining Design Rainfall Pattern (Ministry of Housing and Urban-Rural Development, 2014), the rainfall process sample is calculated by the sliding statistical maximum sample per minute. That is, in a year, the rainfall amount of any continuous period is calculated according to the rainfall duration; then the rainfall amount is sorted, and the process corresponding to the maximum rainfall amount is selected as the annual maximum process sample of the duration in that year.

[0055] 5、According to the same frequency characteristics of the Chicago design rainfall pattern, for a certain rainfall peak position coefficient, the rainfall peak position coefficient of the maximum rainfall process of any duration in the design rainfall pattern is the same. Taking the rainfall peak position coefficient of 180 min as an example, when the Chicago design rainfall pattern is calculated, the rainfall peak position coefficient of any duration less than 180 min in the design rainfall pattern process is equal to . Figure 1 , which is expressed as . Wherein, ; is recorded as , which represents the duration corresponding to the maximum rainfall process of any duration less than 180 min, and here 30, 60, 90, 120, 150, , , represent the starting time, peak time, and ending time of the process, respectively.

[0056] 6、In the Chicago design rainfall pattern with a rainfall duration of 180 min, , , a design rainfall process with a duration of and a rainfall peak position coefficient of is drawn (the orange solid line in Figure 2 ). In Figure 2 , .

[0057] 7、The part before and the part after in the 180 min duration design rainfall process are spliced with the design rainfall process with a duration of , forming a new curve that integrates the characteristics of the 180 min and rainfall duration rainfall pattern processes (see the red wavy line part in Figure 3 ).

[0058] 8、The rainfall peak position coefficient of the rainfall peak time in the rainfall duration of 180 min is calculated. The specific derivation process is as follows,

[0059] Numerator:

[0060]

[0061] Substitute Equation, there are:

[0062]

[0063] Wherein: is the rainfall duration, according to the "Outdoor Drainage Design Standards", generally take 30, 60, 90, 120, 150, 180; is the number of rainfall duration; Indicates the rainfall duration The annual maximum rainfall process of the rain peak position coefficient of the average value of many years; Indicates the annual maximum rainfall process of the rain peak position coefficient of the average value of many years when the rainfall duration is 180min; Indicates The relative rain peak position coefficient in the design rainfall process of the rainfall duration of 180min.

[0064] After verification, regardless of , The moment relative position, the above formula is established.

[0065] 9、According to the above formula, the relative rain peak position coefficient of the rain peak position coefficient of the rainfall duration of 30min, 60min, 90min, 120min, 150min in the design rainfall process of the rainfall duration of 180min is calculated in turn , , , , . At the same time, from the above formula, we can see that .

[0066] 10、Under the condition of the same rainfall duration, the comprehensive rain peak position coefficient can be calculated by arithmetic mean, that is , wherein Take 30, 60, 90, 120, 150, 180. The comprehensive rain peak position coefficient is the comprehensive rain peak coefficient of Chicago rain type based on the geometric shape of the storm process.

[0067] 11、Substitute the above comprehensive rain peak position coefficient into the Chicago rain type instantaneous rain intensity formula , that is, the Chicago design storm process can be calculated. In the formula, , , , The design storm intensity formula is obtained by storm frequency analysis; The design storm return period, unit: year; The design peak moment, from the formula calculated; is the rain peak segmentation ratio, when , , when , .

[0068] Embodiment 1:

[0069] The embodiment of the present application takes a certain city's design storm rain type analysis and calculation as an example for illustration.

[0070] 1. Implementation environment

[0071] The method can be implemented by deploying on a computer.

[0072] Hardware requirements: Central Processing Unit (CPU) main frequency ≥ 1GHz. Memory configuration is recommended to be ≥ 4G DDR4 memory. The hard disk should use a mechanical / solid state disk of 128GB or more.

[0073] System software requirements: The operating system is Windows 8.1 or above. The deployed application software can choose Microsoft Excel 2016 or above version, or Python 3.8 or above programming environment.

[0074] 2. Applicable scenarios

[0075] The method is mainly applicable to the determination of the comprehensive rain peak position coefficient in the urban design storm rain type formula (Chicago method). Based on this parameter, the distribution process of the design rainfall in the rainfall duration is realized, which can be applied to the design and optimization of municipal drainage facilities; it can be used as an input of the urban waterlogging hydrological model to assess urban flood risk and guide flood emergency response; it can also be used for the design of rainwater resource recycling and utilization to calculate the timing and water quantity of rainwater collection, thereby determining the capacity of rainwater collection facilities.

[0076] 3. Overall concept

[0077] In view of the shortcomings of the traditional comprehensive rain peak position coefficient calculation, the present application makes full use of the characteristics of the same frequency of the Chicago design rain type; the long-duration design rain type is calculated according to the long-duration rain peak position coefficient; on this basis, the short-duration rainfall occurrence period is determined on the rainfall process (determined by the same frequency method), the short-duration rain peak position coefficient calculated by statistical analysis is used to calculate the design rain type in the period, and it is spliced with the part outside the period of the original long-duration design rain type to form a new long-duration design rain type, and its rain peak position coefficient is calculated; finally, all the rain peak position coefficients are arithmetically averaged on the unified long-duration rainfall to obtain the Chicago rain type comprehensive rain peak position coefficient based on the geometric shape of the storm process; the present application also derives the comprehensive calculation formula.

[0078] The specific method includes, for example, Figure 5 As shown in the following formula:

[0079] Step 1: According to the minute-by-minute sliding statistical method, the rainfall process corresponding to the annual maximum rainfall of the rainfall duration is selected, and the annual maximum rainfall process corresponding to the annual maximum rainfall with a rainfall frequency greater than 99% is removed, and then the annual and duration rain peak position coefficient is calculated according to the formula The results are as follows.

[0080] Table 1 Rain peak position coefficient of rainstorm process with rainfall frequency less than 99% at a typical rainfall station in a city

[0081]

[0082] Table 1-continued Rain peak position coefficient of rainstorm process with rainfall frequency less than 99% at a typical rainfall station in a city-continued

[0083]

[0084] Step 2: The rain peak position coefficient of the same duration annual maximum growth sample is calculated and averaged to obtain the following table.

[0085] Table 2 Rain peak position coefficient of different statistical rainfall durations in a city

[0086]

[0087] Step 3: The formula designed according to the present application is used to calculate the comprehensive rain peak position coefficient, which is 0.438.

[0088] Step 4: The parameters of the design storm intensity formula of the city are 77.287, 0.994, 29.7, and 1.102, respectively. Substitute the above five parameters into the Chicago rain type instantaneous rain intensity formula to obtain the design storm rain type of any duration and return period. Taking 180 min rainfall duration and 20-year return period as an example, select 5 min as the time interval, and the Chicago design storm rain type is shown in the following figure.

[0089] Example 2

[0090] The present application provides a Chicago rain type comprehensive rain peak coefficient calculation device based on the geometric shape of a rainstorm process, comprising a processor and a storage medium.

[0091] The storage medium is used to store instructions.

[0092] ​​​The processor is configured to operate according to the instructions to perform the steps of the method according to embodiment 1.

[0093] Embodiment 3:

[0094] The present embodiment provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method according to embodiment 1.

[0095] Those skilled in the art will appreciate that embodiments of the present application can be supplied as methods, systems, or computer program products. Accordingly, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application can take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) embodying computer readable program code thereon.

[0096] The present application is described in reference to flowcharts and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and combinations of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowcharts and / or block diagrams block or blocks. Figure 1 one or more flows and / or blocks Figure 1 means for carrying out the function specified by the flow or flows and / or block or blocks.

[0097] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the flowcharts and / or block diagrams block or blocks. Figure 1 one or more flows and / or blocks Figure 1 means for carrying out the function specified by the flow or flows and / or block or blocks.

[0098] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions executed on the computer or other programmable apparatus provide steps for implementing the flowcharts and / or block diagrams block or blocks. Figure 1 one or more flows and / or blocks Figure 1 means for carrying out the function specified by the flow or flows and / or block or blocks.

[0099] The above merely describes the preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. A method for calculating the Chicago rain type composite peak factor based on the geometric shape of a storm process, characterized in that, The method comprises the following steps: The rainfall process corresponding to the annual maximum value of the annual rainfall of each rainfall duration is counted year by year, the starting moment, peak moment and ending moment are recorded, and the rain peak position coefficient is calculated to obtain the single-hour rain peak position coefficient of multiple years of multiple rainfall durations; The single-hour rain peak position coefficients of multiple years of multiple rainfall durations are screened to obtain the screened single-hour rain peak position coefficients of multiple years of multiple rainfall durations; The arithmetic mean of the single-hour rain peak position coefficients of multiple years of each rainfall duration is calculated according to the screened single-hour rain peak position coefficients of multiple years of multiple rainfall durations; The comprehensive rain peak position coefficient is calculated according to the arithmetic mean of the single-hour rain peak position coefficients of multiple years of each rainfall duration according to the following formula: ； wherein: is the rainfall duration; is the number of rainfall durations; denotes the rainfall duration of the annual maximum rainfall process; denotes the annual average of the rain peak position coefficient of the annual maximum rainfall process for a rainfall duration of 180 min; denotes the relative rain peak position coefficient in a design rainfall process with a rainfall duration of 180 min; The rain peak position coefficients of multiple years of multiple rainfall durations are screened, including: The rain peak position coefficients corresponding to the annual maximum rainfall less than the design rainfall with a frequency of 99% are removed.

2. The method for calculating the Chicago rain type composite storm peak factor based on the geometric morphology of the storm process according to claim 1, characterized in that, The rainfall process corresponding to the annual maximum value of the annual rainfall of each rainfall duration is counted year by year, including: For single rainfall duration Within a year, the rainfall process corresponding to the annual maximum rainfall of the rainfall duration is selected by using the minute-by-minute sliding statistical method. The recorded year of the statistical rainfall data is not less than 20.

3. The method for calculating the Chicago rain type composite storm peak factor based on the geometric morphology of the storm process according to claim 1, characterized in that, The calculation formula of the rain peak position coefficient is: ； wherein , , are the start time, peak time, end time, respectively.

4. The method for calculating the Chicago rain type composite storm peak factor based on the geometric morphology of the storm process according to claim 1, characterized in that, When calculating the single duration rain peak position coefficient, according to the Technical Guidelines for Formulating Urban Rain Intensity Formula and Determining Design Rain Type, the single duration rain peak position coefficients of 30min, 60min, 90min, 120min, 150min, and 180min are calculated in turn, denoted as wherein 30, 60, 90, 120, 150, and 180 are taken.

5. The method for calculating the Chicago rain type composite storm peak factor based on the geometric morphology of the storm process according to claim 1, characterized in that, The method further comprises: The calculated comprehensive rain peak position coefficient is substituted into the Chicago rain type instantaneous rain intensity formula That is, the Chicago design storm process can be calculated. In the formula, , , , is a design parameter of the storm intensity formula, obtained by storm frequency analysis; is a design storm return period, in years; is a design peak time; is a rain peak segmentation ratio, t is a rainfall duration, when , when , .

6. A device for calculating a Chicago rain type composite rain peak factor based on the geometric configuration of a storm process, characterized by The storage medium is used for storing instructions; The processor is used for operating according to the instructions to perform the steps of the method according to any one of claims 1-5. The program is executed by the processor to realize the steps of the method according to any one of claims 1-5.

7. A computer readable storage medium having stored thereon a computer program, characterized in that ​

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