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Floodplain elevation determination method based on wavelet analysis

A determination method and wavelet analysis technology, applied in complex mathematical operations, instruments, design optimization/simulation, etc., can solve problems such as heavy workload, deviation of beach-trough boundary line, etc., and achieve accurate results, simple operation, and accurate calculation results Effect

Active Publication Date: 2020-05-05
HOHAI UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, there is a large deviation between the beach-trough boundary obtained in actual operation and the engineering expectation
In addition, this method requires many parameters, and when the parameters of the front and back sections are changed, operations such as manual division must be performed again, and the workload is relatively large

Method used

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  • Floodplain elevation determination method based on wavelet analysis
  • Floodplain elevation determination method based on wavelet analysis
  • Floodplain elevation determination method based on wavelet analysis

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Embodiment Construction

[0030] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0031] Such as figure 1 As shown, the specific steps of a floodplain elevation determination method based on wavelet analysis are as follows:

[0032] Step 1. Collect digital topographic data of the river section and arrange measuring points. The measuring points are marked as D from left to right i (i=1, 2,..., n), the corresponding elevation is z bi (i=1,2,...,n), where D 1 =0, record D i to D i+1 The width between two measuring points is B i (i=1,2,...,n-1);

[0033] Step 2, according to the characteristics of the selected channel and the collected data, set the channel roughness and determine the gradient of the river bed;

[0034] Step 3, set the minimum cal...

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Abstract

The invention discloses a floodplain elevation determination method based on wavelet analysis, and the method comprises the steps: employing an S-K model for simulation to obtain the vertical flow velocity distribution of a river cross section, and calculating kinetic energy correction coefficients under different water levels; and carrying out discrete wavelet decomposition on the water level-kinetic energy correction coefficient function to obtain a high-frequency signal layer and coefficient absolute values of corresponding layers; analyzing the absolute value of the obtained highest frequency layer coefficient, determining the abrupt change position of the kinetic energy correction coefficient, and determining the elevation of the flood bank through comprehensive analysis. In the implementation process of the method, the defect that the beach-trough demarcation point is artificially judged in a traditional method is overcome, subjectivity is weak, the method is verified through tests, the calculation result is accurate, operability is high, and a more accurate mode is provided for obtaining the floodplain elevation of the compound cross-section river channel.

Description

technical field [0001] The invention relates to a method for determining floodplain elevation based on wavelet analysis, in particular to a method for determining the floodplain elevation by dividing a floodplain and a main channel based on a sudden change in the kinetic energy correction coefficient of a compound cross-section channel, and belongs to the technical field of floodplain division in riverbed evolution analysis . Background technique [0002] Floodplain elevation refers to the elevation of the river water level when it is equal to the floodplain. Most of the sediment-rich rivers in northern my country have a compound cross-section with a beach and a main channel at the same time. The analysis of the measured data shows that when the water level of the beach is flat, the bed-making ability of the water flow is strong, and when the flow is so large that it overflows the side beach, the water flow disperses and the bed-making effect decreases. With the rapid deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F17/14
CPCG06F17/148Y02A10/40
Inventor 秦杰叶圣南吴腾白驹郭润卓刘旖萱
Owner HOHAI UNIV
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