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Method for determining rainfall intensity formula with functional rainfall attenuation index

A rainstorm attenuation index, rainstorm intensity technology, applied in electrical digital data processing, complex mathematical operations, special data processing applications, etc., can solve the problems of high analytical method, poor fitting accuracy, low parameter efficiency, etc., to achieve high computational efficiency , good effect, high fitting accuracy

Inactive Publication Date: 2012-09-12
JIANGSU VOCATIONAL INST OF ARCHITECTURAL TECH
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Problems solved by technology

[0028] In order to overcome the defects that the manual algorithm determines the function form of the rainstorm attenuation index in formula (6) and the parameter efficiency in formula (6) is low, the required parameters have certain arbitrariness, and the fitting accuracy is not as high as the analytical method, the present invention adopts Gauss- Newton's method determines the rainstorm attenuation index as a functional formula of rainstorm intensity, that is, the general formula (6)

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  • Method for determining rainfall intensity formula with functional rainfall attenuation index
  • Method for determining rainfall intensity formula with functional rainfall attenuation index
  • Method for determining rainfall intensity formula with functional rainfall attenuation index

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Embodiment Construction

[0031] Given a certain city’s return period P, rainfall intensity i and rainfall duration t, there are m groups of relational values ​​(P j , t j i j ), j=1~m, where each single return period has m 1 group observations.

[0032] 1. Determine the relationship between the rainstorm attenuation index n and the return period P in formula (6) and the initial value of each parameter in formula (6).

[0033] (1) Use the Gauss-Newton method to determine the parameters A, b, n of each single recurrence period formula (1)

[0034] 1) Calculate partial derivatives of parameters A, b, and n in formula (1) respectively

[0035] ∂ i / ∂ A = 1 / ( t + b ) n - - - ( 7 )

[0036] ∂ i ...

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Abstract

The invention relates to a method for determining a rainfall intensity formula with a functional rainfall attenuation index, and belongs to the technical field of the municipal engineering. The method comprises the following steps of: according to relation values of a return period P, a rainfall intensity i and the duration t, firstly, determining parameters of each single return period subformula by adopting a Gauss-Newton method; secondly, selecting a rainfall attenuation index n and the return period P to form a semi-logarithmic or power-functional correlative relation by regression calculation, using the relation with a larger correlation index R2 as the adopted relation of n and P, simultaneously carrying out regression calculation on parameters in a relation of a rain force A and the return period P, using obtained parameter values as initial values of corresponding parameters in each return period total formula and for a parameter b, using an average value of all the single return periods as an initial value of b in the total formula; and then determining parameters of the total formula with the functional rainfall attenuation index n by adopting the Gauss-Newton method so as to obtain the rainfall intensity formula. The formula is the basic foundation of determining the rainwater design flow in the urban drainage work design.

Description

1. Technical field [0001] The invention belongs to the technical field of municipal engineering. The storm intensity formula is one of the basic basis for determining the design flow of rainwater in the design of urban drainage projects. The rationality and accuracy of the formula directly affect the scale of urban drainage projects. 2. Background technology [0002] At present, the general form of the urban rainstorm intensity formula in my country is: [0003] Fractional formula for a single return period i = A ( t + b ) n - - - ( 1 ) [0004] General formula for each return period i = A 1 ( 1 ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00G06F17/10
Inventor 张子贤刘家春孙光东孙建印
Owner JIANGSU VOCATIONAL INST OF ARCHITECTURAL TECH
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