Mainstream swing flow rate time-order character based river type classifying method

Abstract

The invention relates to the technical field of water conservancy projects, and specifically relates to a mainstream swing flow rate time-order character based river type classifying method. The method comprises the steps of dividing a researching river section into an upstream river section and a downstream river section; correspondingly drawing wavelet transform coefficient real part isoline maps based on Morlet wavelet function; obtaining the distribution and phase structures of characteristic flow rate of the mainstream swing of the downstream river section at different time scales in eachyear, and comparing and analyzing; and if the characteristic flow rates, influencing the mainstream swing, of the upstream river section and the downstream river section, are at the same grade, and the positive phase energy centers of the characteristic flow lasting day series of the mainstream swing under different flow rate grades occur in the same year, namely, the upstream river section and the downstream river section have the corresponding order characters, determining that the downstream river section is a barrier-free river section, and otherwise, determining that the downstream riversection is a barrier type river section. The river section river type classifying method is simple and efficient; different river sections can be rapidly accurately classified; and theoretical foundation is conveniently supplied to determine methods for treating river sections of different types in the river section treatment process.

Description

technical field [0001] The invention relates to the technical field of water conservancy engineering, in particular to a river type division method based on the time series characteristics of mainstream swing flow. Background technique [0002] The division of river types is a traditional issue in the discipline of fluvial geomorphology, and many scholars have carried out a number of studies. For example, Leopold and Wolman divided rivers into meandering rivers and braided rivers according to the relationship between gradient and flow; Schumm divided rivers into meandering rivers, braided rivers, and straight rivers according to the sinuosity and valley gradient; Rust The index (the number of braids per average wavelength) defines the networked river; Knighton and Nanson enriched the networked river theory in terms of origin, characteristics and classification; Brice proposed the branched river (anabranched river). In recent years, some foreign scholars have proposed the co...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that it is difficult to accurately divide the river section in the existing technology mentioned in the above background technology, which leads to the problem that the river section regulation is too general and affects the regulation effect, and provides a river type based on the time series characteristics of mainstream swing flow Division method

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