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Halphen B distribution-based flood frequency analysis method and system

A technology of flood frequency and analysis method, applied in the fields of instrument, calculation, electrical digital data processing, etc., can solve the problem of low accuracy of flood frequency analysis

Inactive Publication Date: 2017-03-22
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] Aiming at the above improvement needs of the prior art, the present invention provides a flood frequency analysis method and system based on Halphen B distribution, the purpose of which is to introduce Halphen B distribution into the flood frequency analysis, and realize it by using the principle of maximum entropy according to the characteristics of the distribution function The parameter estimation of the distribution function, on this basis, the design flood calculation based on the Halphen B distribution is carried out, thereby solving the technical problem of low accuracy of the flood frequency analysis of the existing analysis technology

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  • Halphen B distribution-based flood frequency analysis method and system
  • Halphen B distribution-based flood frequency analysis method and system
  • Halphen B distribution-based flood frequency analysis method and system

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Embodiment

[0080] Embodiment: Utilize the annual maximum flow sequence data of a typical hydrological station A in a watershed to test the fitting effect of the Halphen B distribution, and substitute the annual maximum flow sequence data of the hydrological station A into the parameter derivation formula to obtain the parameter α=5.5735 of the Halphen B distribution, m=0.8924, v=0.8879, substitute the parameter values ​​into the flood probability density function, and draw the function curve, such as figure 2 Shown is the fitting of the peak discharge and its probability density, given by figure 2 It can be seen that the fitting effect of the flood probability density function is good; the distribution function is obtained by integrating the probability density function, and the distribution function curve is drawn, as shown in image 3 As shown, the discrete points and curves in the figure are the empirical frequency value and theoretical frequency value of the flood peak flow respect...

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Abstract

The invention discloses a Halphen B distribution-based flood frequency analysis method and system, and belongs to the field of hydrologic analysis and computation. The method comprises the steps of firstly introducing Halphen B distribution in flood frequency analysis; constructing a flood probability density function; realizing parameter estimation of the Halphen B distribution by adopting a maximum entropy principle according to characteristics of a distribution function; and deducing a design flood value in a T-year return period by utilizing the flood probability density function. The invention furthermore realizes the Halphen B distribution-based flood frequency analysis system. The flood frequency analysis method and system is very suitable for hydrologic frequency analysis, and a fitting result of the Halphen B distribution is basically superior to that of other conventional distribution in hydrologic frequency analysis; and a more effective way is provided for the hydrologic frequency analysis.

Description

technical field [0001] The invention belongs to the field of flood forecasting, and more specifically relates to a flood frequency analysis method and system based on Halphen B distribution. Background technique [0002] Floods are generally defined by the probability density of flood occurrence, such as once in 20 years, once in 50 years, and once in a hundred years. The purpose of the flood frequency analysis is to deduce the design flood value of the once-in-year T flood through the extension of the frequency curve. If the calculated design flood value is large, the scale is too large, which will increase investment and cause waste; if the calculated design flood value is low, the scale is too small, which may lead to engineering accidents and losses under unfavorable hydrological conditions. [0003] Therefore, carrying out high-precision flood frequency analysis is the primary issue in the design and planning of water conservancy and hydropower projects, and selecting ...

Claims

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Application Information

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IPC IPC(8): G06F19/00
CPCG16Z99/00Y02A10/40
Inventor 陈璐熊丰周建中黄康迪何典灿杨振莹
Owner HUAZHONG UNIV OF SCI & TECH
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