Lake underwater terrain modeling method based on small amount of actually measured water depth data

Abstract

The invention discloses a lake underwater terrain modeling method based on a small amount of actually measured water depth data, and the method comprises the steps: taking an elevation profile collected along the central axis of a lake as a terrain skeleton of the lake, and constructing a series of lake cross sections connecting a lakeside zone and the central axis on the basis of determining the range of a lakeside zone buffer zone; and the elevation value of the underwater area of the cross section is speculated under the constraint of the actually measured elevation value of the central axis by utilizing the known elevation of the lakeside zone. And finally, constructing a complete underwater terrain of the lake based on the cross section elevation and the central axis elevation one by one and spatial interpolation. The method does not need to carry out whole lake measurement, and greatly reduces the time and economic cost of lake field investigation work. The method is suitable for measurement work of large lakes in areas lack of data, and the constructed lake underwater topographic data can provide technical support for monitoring dynamic changes of lake water resources, revealing response characteristics of the lake water resources to global changes and the like.

Description

technical field [0001] The invention belongs to the field of lake hydrology, in particular to a lake underwater terrain modeling method based on a small amount of measured water depth data. Background technique [0002] Lakes store about 87% of the fresh water on the global surface and are an important source of water for human production and living (Downing et al., 2006). At the same time, lakes are also a key link in the terrestrial water cycle, which is of great significance to maintaining the stability of regional ecosystems (Woolway et al., 2020). The underwater topography of lakes is the basic attribute of lakes, which determines the size of lake water storage. Mastering information about underwater topography of lakes is an important basis for evaluating and monitoring lake water resources. Research provides important background data. [0003] Field survey is the most direct means to obtain the underwater topography of lakes, and underwater topography mapping can be...

AI Technical Summary

Problems solved by technology

Although the spatial inference method realizes the estimation of lake water depth and water volume on a large regional scale, due to the influence of sample size, distribution and representativeness, there are still large uncertainties in the water volume estimation results of individual lakes and lakes in some regions.

[0004] To sum up, the existing field measurement and spatial inference methods have their own defects, and cannot balance accuracy and efficiency

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