Three-dimensional sand ripple terrain analysis method
A terrain analysis and three-dimensional terrain technology, applied in the field of marine engineering, can solve problems such as low accuracy, low statistical efficiency and accuracy, and inability to overcome sand dune signal interference, so as to achieve the effect of improving efficiency and accuracy
Pending Publication Date: 2022-05-06
TIANJIN RES INST FOR WATER TRANSPORT ENG M O T
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Problems solved by technology
The traditional method of counting sand streaks is mainly based on the extreme value calibration method and the zero-crossing method. Among them, the zero-crossing method is suitable for the overall distribution of sand ripple signals on both sides of the horizontal zero line, and the existence of sand dunes seriously affects the statistical effect of the zero-crossing method. , at the same time, due to the inclusion of sand dune information, the accuracy of the statistical results of the geometric size of sand grains is not high
The extreme value calibration method can overcome the requirements of the zero crossing method for the overall level of the signal, but the noise and local extreme values have a great impact on the statistics of sand ripples, and at the same time cannot overcome the interference of the dune signal. If the manual calibration of the extreme value has low efficiency and Disadvantages such as large human error
None of the above methods can remove the influence of sand dunes well, and the statistical efficiency and accuracy are low
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[0046] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0047] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be understood ...
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The invention provides a three-dimensional sand ripple terrain analysis method. The three-dimensional sand ripple terrain analysis method comprises the following steps: acquiring terrain point cloud coordinates by using terrain scanning equipment; obtaining a three-dimensional terrain point cloud coordinate under a new coordinate system through preprocessing; a sand ripple signal column is extracted and interpolation processing is carried out; performing wavelet transform to obtain a global wavelet spectrogram, and confirming a sand dune wavelength value; processing through a filter to obtain an optimized sand ripple signal column; and analyzing the optimized sand ripple signal column by adopting a cross-zero analysis method, and counting the sand ripple length and the sand ripple height. According to the three-dimensional sand ripple terrain analysis method provided by the invention, the defect of a zero-crossing method in sand ripple statistics when a sand dune exists is overcome, and the influence of the whole fluctuating sand dune on the zero-crossing method is effectively overcome.
Description
technical field [0001] The invention belongs to the field of marine engineering, and in particular relates to a three-dimensional sand-ripe terrain analysis method. Background technique [0002] In the complex marine dynamic environment, the shape of sand ripples produced by the joint action of currents and waves is quite different from that under laboratory conditions. The sand ripples under natural conditions are mainly in the form of composite superposition of sand ripples and dunes exist. The geometric size of sand ripples is of great significance to the development of near-bottom hydrodynamics and bed surface. The traditional method of counting sand streaks is mainly based on the extreme value calibration method and the zero-crossing method. Among them, the zero-crossing method is suitable for the overall distribution of sand ripple signals on both sides of the horizontal zero line, and the existence of sand dunes seriously affects the statistical effect of the zero-cr...
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IPC IPC(8): G06T7/521G06T7/41G06T5/00G06T3/40
CPCG06T7/521G06T7/41G06T3/4007G06T2207/10028G06T2207/20024G06T5/70
Inventor 张华庆肖唐陈松贵陈汉宝刘鸣洋胡杰龙彭程王依娜赵旭
Owner TIANJIN RES INST FOR WATER TRANSPORT ENG M O T