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A method for rapid nonlinear diagnosis and attribution analysis of rainfall-runoff relationship in watershed

A technology for rapid diagnosis of rainfall runoff, applied in complex mathematical operations, etc., can solve problems such as the inability to analyze the relationship between bivariate nonlinear changes, and achieve reliable settlement results and simple calculation methods

Active Publication Date: 2019-03-29
XIAN UNIV OF TECH
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Problems solved by technology

[0003] For a long time, the impact of climate change and human activities on river runoff has been an important direction for hydrology and water resources researchers. Researchers have proposed trend analysis and various univariate mutation point test methods, but these methods cannot analyze bivariate The serious problem with the non-linear variation relationship between

Method used

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  • A method for rapid nonlinear diagnosis and attribution analysis of rainfall-runoff relationship in watershed
  • A method for rapid nonlinear diagnosis and attribution analysis of rainfall-runoff relationship in watershed
  • A method for rapid nonlinear diagnosis and attribution analysis of rainfall-runoff relationship in watershed

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Embodiment

[0076] like figure 1 As shown, taking the Baijiachuan Hydrological Station in the Wuding River Basin as an example, the specific steps are as follows:

[0077] Step 1, first collect basic data:

[0078] (1) Daily flow data from Baijiachuan Hydrological Station of Wuding River Basin Control Station from 1963 to 2005, and annual runoff calculated from the Yellow River Hydrological Yearbook;

[0079] (2) Dingjiagou, Suide, Zhaoshipan, Hengshan, Dianshi, Zhaoshiyao, Jingbian, Qingyangcha, Mahuyu, Hanjiamao, Mengjiawan, Lijiahe 12 in the watershed and its surrounding areas The daily precipitation data of each rainfall station from 1963 to 2005 were calculated according to the arithmetic mean method to obtain the annual areal rainfall of the basin;

[0080] Step 2, according to the principle of hydrological statistics, through the non-parametric Kolmogorov-Sminov test, using four commonly used probability distributions in hydrology: exponential distribution (EXP), Gumbel distribut...

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Abstract

The invention discloses a method for rapid diagnosis and attribution analysis of non-linearity of rainfall-runoff relationship in a watershed. Firstly, a research watershed is determined, and annual runoff of a control hydrological station and annual rainfall data of a watershed rainfall station are collected. The optimal theoretical probability distribution function is obtained. Using Archimedesfamily Copula function, the theoretical optimal two-dimensional joint distribution function of annual rainfall and annual runoff is established. The likelihood ratio statistic of the theoretical optimal two-dimensional joint distribution is obtained, and the likelihood ratio statistic value of the sample is calculated to determine the catastrophe point. It is assumed that the year before the sudden change is the natural period and the natural period is the base period, and the year after the sudden change is the period affected by human activities; establishing a rainfall runoff model and reconstructing annual runoff data; The invention compares the annual runoff data with the measured data to obtain the contribution rate of the climate change and the human activities to the runoff change.The invention improves the efficiency and accuracy of the rapid diagnosis of the rainfall-runoff relationship of the watershed.

Description

technical field [0001] The invention belongs to the technical field of diagnosing methods for variation of hydrological elements, and in particular relates to a method for rapid non-linear diagnosis and attribution analysis of rainfall-runoff relations in a watershed. Background technique [0002] On a global scale, river runoff is an important source of water resources for human survival, life and production. In recent years, especially since the reform and opening up, with the rapid development of industrialization and urbanization, my country's socialist construction and economic level have continued to improve The impact of human activities on the natural environment has increased significantly, and water resource issues have also become increasingly prominent. At the same time, global climate change also plays an important role in the hydrological cycle. Therefore, it is very important to scientifically and accurately evaluate the impact of human activities and climate c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/18G06F17/16
CPCG06F17/16G06F17/18Y02A90/10
Inventor 任宗萍贾路李占斌李鹏徐国策成玉婷王飞超王斌张译心张家欣刘昱杨殊桐
Owner XIAN UNIV OF TECH
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