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Halphen IB distribution-based flood frequency analysis method

A technology of flood frequency and analysis method, applied in the field of flood frequency analysis based on HalphenIB distribution, which can solve the problem of low accuracy of flood frequency analysis

Active Publication Date: 2017-04-05
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] For the above defects or improvement needs of the prior art, the present invention provides a flood frequency analysis method and system based on the Halphen IB distribution, the purpose of which is to introduce the Halphen IB distribution into the flood frequency analysis, and adopt maximum entropy according to the distribution function The principle is to realize the parameter estimation of the distribution function, and on this basis, carry out the design flood calculation based on the Halphen IB distribution, thereby solving the technical problem of low accuracy of the flood frequency analysis of the existing analysis technology

Method used

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  • Halphen IB distribution-based flood frequency analysis method
  • Halphen IB distribution-based flood frequency analysis method

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Embodiment

[0082] Embodiment: Utilize the annual maximum flow sequence data of a typical hydrological station A in a watershed to check the fitting effect of the Halphen IB distribution, and substitute the annual maximum flow sequence data of the hydrological station A into the parameter derivation formula to obtain the parameter α=5.6685 of the Halphen IB distribution, m=7.3715, v=0.9448, 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 resp...

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Abstract

The invention discloses a Halphen IB distribution-based flood frequency analysis method and system, and belongs to the field of hydrological analysis and calculation. According to the flood frequency analysis method, Halphen IB distribution is introduced to flood frequency analysis firstly; a flood probability density function is established; parameter evaluation on the Halphen IB distribution is realized by adopting a maximum entropy principle based on distribution function characteristics; and then a design flood value in one time every T years is solved based on the flood probability density function through deducing. The invention also realizes a Halphen IB distribution-based flood frequency analysis system. The flood frequency analysis method and system disclosed by the invention are quite suitable for hydrological frequency analysis, and the fitting result is basically better than that of other distribution in the hydrological frequency analysis. Therefore, a more effective approach is provided for the hydrological 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 IB 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. Selecting the...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06Q50/06
CPCG06F30/20G06Q50/06Y02A10/40
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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