A method for automatic generation of river topography reflecting the basic characteristics of rivers

Abstract

The invention discloses a method for automatically generating river topography reflecting basic characteristics of rivers, which belongs to the field of water conservancy engineering. The method extracts the left, right, and bottom of rivers reflecting basic characteristics of rivers by combining the actual cross-sectional data of rivers with high-resolution remote sensing images or existing river vector data. The right bank (dike) line and the deep river line pass through the middle line between the left and right bank (dike) lines and the deep river line of the encrypted river channel, and intersect with the measured section line of the river channel to form a directional interpolation line segment of the river channel, which is further generated by directional interpolation River channel elevation points that reflect the basic characteristics of the three lines of the river, so as to realize the automatic generation of river channel terrain. This method can greatly reduce the input of manpower, material resources and financial resources for manual measurement of river topography. At the same time, the generated river topography can fully reflect the basic characteristics of the three lines of the river, ensuring the scientificity and accuracy of the generated river topography, thereby improving the quality of water conservancy projects. The accuracy of the design, calculation and analysis in the application improves the efficiency and effectiveness of the industry application.

Description

technical field [0001] The invention relates to the field of water conservancy engineering, in particular to a method for automatically generating river topography reflecting basic characteristics of rivers. Background technique [0002] River topography, especially river underwater topography, is not provided in general surveying and mapping data, and river topography data is often the basis for hydraulic analysis and calculation of floods, sediment movement, and pollutant diffusion. In order to obtain better underwater terrain data of the river channel, the conventional method is to measure as many river channel sections as possible, or directly cover the measurement points so that the measurement points are evenly distributed in the river channel, and then perform conventional interpolation calculations to obtain the channel topography, but this method Often to consume more manpower and financial resources. [0003] In recent years, relevant companies and units at home a...

AI Technical Summary

Problems solved by technology

The technology disclosed by Hohai University in CN104537717A patent only involves the method of making thematic maps of river topography. The elevation points and contour data of the underwater topography of the river are obtained through actual measurement. It does not involve the automatic generation technology of the underwater topography of the river, which requires a lot of work. A lot of human and financial resources are used to carry out the measurement of the underwater topography of the river

In the technology disclosed in CN103425856A patent by Tairui Digital Technology (Beijing) Co., Ltd., the vector boundary line of the river is used as the boundary range generated by the river terrain, and the interpolation grid is generated along the direction of the river, and then the kriging interpolation algorithm is used to The height values ​​are interpolated from the grid points in every two fixed sections, and finally all the grid data assigned height values ​​are generated to generate a general river topography data file. This method ensures that the generated river topography is distributed according to the trend of the river, but The accuracy of the river topography cannot be guaranteed, especially without considering the main features of deep floods in the underwater topography of the river

The direct cross-sectional interpolation method adopted by the U.S. Army Corps of Engineers in the HecRAS flood analysis software only uses two measured cross-sections for interpolation. match

[0004] It can be seen that the above-mentioned existing river topography generation method obviously still has inconvenience and defects, and needs to be further improved urgently.

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