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Step-by-step decomposition method for shallow sea complex terrain

A complex terrain and terrain technology, applied in complex mathematical operations, instruments, surveying and navigation, etc., can solve problems such as difficult quantification and research of complex submarine terrain

Active Publication Date: 2019-12-03
SECOND INST OF OCEANOGRAPHY MNR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of difficult quantification and research of the complex topography of the seabed, the invention discloses a step-by-step decomposition method of the complex topography of the shallow sea

Method used

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  • Step-by-step decomposition method for shallow sea complex terrain
  • Step-by-step decomposition method for shallow sea complex terrain
  • Step-by-step decomposition method for shallow sea complex terrain

Examples

Experimental program
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Embodiment 1

[0042] Embodiment 1 Implementation process of a step-by-step decomposition method for shallow sea complex terrain

[0043] Such as figure 1 As shown, this embodiment describes a step-by-step decomposition method for shallow sea complex terrain based on the combination of Fourier transform and Butterworth filter principles, including the following main steps:

[0044] 1) Data preprocessing: CUBE filtering, sound velocity correction, tide level correction and other data processing processes are performed on the original multi-beam water depth data obtained by survey, and a high-precision digital water depth model is constructed;

[0045] 2) Frequency analysis: One-dimensional and two-dimensional Fourier transforms are used to transform the superimposed terrain from the space domain to the frequency domain.

[0046] In the spatial domain terrain signal, the spatial frequency is the number of periodic occurrences per unit distance, and the unit is 1 / m. A discrete signal sequence ...

Embodiment 2

[0066] Embodiment 2 Take the typical sand wave terrain in shallow sea as an example for specific application

[0067] by Figure 2(a) , 2(b) The data shown are taken as an example to verify the method. The data shown is the full-coverage water depth data obtained by multi-beam survey, with a resolution of 1×1m. Figure 2(a) shows the plane terrain, and Figure 2(b) intercepts a sand wave profile, which shows various scales The sand wave terrain is superimposed to form a complex shallow sea terrain. According to the method flow in Embodiment 1, the terrain signal is transformed into the frequency domain by Fourier transform, and decomposed step by step into sand wave terrain with different frequencies through frequency division processing. After grayscale transformation, the terrain grayscale image is obtained. Figure 3(a)-(c) shows the three types of terrain grayscale images finally decomposed.

[0068] Figure 4 is the definition method of sand wave shape parameters, the w...

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Abstract

The invention discloses a step-by-step decomposition method for a shallow sea complex terrain. On a shallow sea land frame, various scales of seabed terrains are superposed to form a complex geomorphic system, and consequently, it is difficult to carry out quantitative studies. According to the method, a Fourier analysis method is combined with a Butterworth filter to realize conversion of terrainsignals from a spatial domain to a frequency domain, and superimposed terrains are decomposed into a plurality of groups of single-type terrains with different frequencies through frequency division.An example test result shows that the method can quickly and accurately decompose the complex seabed superimposed terrain into terrains with different spatial scales. The method has important practical value in the aspects of marine surveying and mapping, marine engineering safety evaluation, marine science research and the like.

Description

technical field [0001] The invention relates to a step-by-step decomposition method of shallow sea complex topography. Background technique [0002] The shelf shallow sea is the sea area where the land extends to the open sea. The common terrains include shoals, sand ridges, sand waves, submarine waterways, etc. Under the action of complex submarine hydrodynamics, the morphology of the submarine topography is often mixed together at multiple scales. This brings great difficulties to the quantitative analysis of terrain at different scales. [0003] With the application of multi-beam bathymetry in the detection of seabed geomorphology, the underwater measurement method from point to surface has been realized, which has promoted the development of seabed geomorphology from qualitative to quantitative research. etc. played an important role. Ronald R. Gutierrez proposed to standardize the nomenclature and symbols of seabed sand waves, and used the method of combining continuo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06F17/14G06F17/16G01C7/00
CPCG06F17/14G06F17/16G01C7/00Y02A90/10
Inventor 朱超吴自银周洁琼赵荻能王明伟刘洋罗孝文尚继宏
Owner SECOND INST OF OCEANOGRAPHY MNR
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