Probability weighting FDC method-based river ecological water demand calculation method
A technology of probability weighting and water demand, which is applied in calculation, instrumentation, electrical digital data processing, etc., can solve the problems of not considering the interannual change, not reflecting the annual change of ecological water demand, and only considering the annual change, etc., so as to achieve reasonable calculation results Reliable, important promotion value, easy to implement effect
Inactive Publication Date: 2017-04-26
WUHAN UNIV
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At present, a large part of the common hydrological methods do not reflect the intra-annual variation of ecological water demand, and some only consider the intra-annual variation and do not consider the inter-annual variation. Only a few methods consider the intra-annual and interannual variation
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[0044] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be introduced below in conjunction with the embodiments of the present invention.
[0045] Embodiments of the present invention include the following steps:
[0046] Step 1, frequency analysis of runoff data series, the runoff data series is multi-year runoff data of rivers with a daily period of time, the realization is as follows,
[0047] First of all, the runoff data series are calculated and sorted into annual average runoff series and monthly average runoff series. Assuming that there are N years of data in total, the length of N data should be as long as possible (N is not less than 20 years), then the processed data Among them, the annual average runoff series contains N annual average runoff data, and the monthly monthly average runoff series contains N monthly average runoff data from Ja...
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The present invention provides a probability weighting FDC method-based river ecological water demand calculation method. The method comprises the steps of performing frequency analysis on runoff data series, and dividing an annual average runoff series and a monthly average runoff series into a flood season group, an ordinary season group and a dry season group; building a daily flow duration curve for the flood season group, the ordinary season group and the dry season group of each month, selecting flows corresponding to 90% durations as ecological water demand, and calculating monthly ecological water demand of an initial typical year of the flood season, the ordinary season and the dry season; building joint distribution of annual and monthly water probability by using a Copula function, and calculating a probability weight; and calculating monthly ecological water demand of a final typical year of the flood season, the ordinary season and the dry season by using the calculated monthly ecological water demand of the initial typical year of the flood season, the ordinary season and the dry season and the probability weight. A new technological solution is provided for quantitative analysis of the river ecological water demand, the probability weight concept and the calculation method are raised for the first time, and a more reasonable river ecological water demand result is obtained on the basis of a flow duration curve method by calculating condition probabilities of annual and monthly flood seasons, ordinary seasons and dry seasons.
Description
technical field [0001] The invention belongs to the field of ecological hydrological analysis and calculation, in particular to a method for calculating river ecological water demand based on a probability-weighted FDC method. Background technique [0002] According to incomplete statistics, there are more than 200 research methods on the ecological water demand of rivers. By studying the ecological water demand of rivers, it can provide decision support for reservoir dispatching with the goals of flood control, power generation, and ecology. Relevant research methods are mainly divided into four categories: the hydrological method using historical hydrological data; the hydraulic method based on the hydraulic properties of the river section; the habitat simulation method through the analysis of habitat suitability; the holistic method considering various factors. These methods all have a certain ecological basis and have their own advantages and disadvantages. However, due ...
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IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 龙凡梅亚东
Owner WUHAN UNIV
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