A method for measuring soil erosion

Abstract

The invention relates to a method for measuring water and soil loss. The method includes: image collection, processing the collected images into blocks, performing three-dimensional reconstruction on each block, splicing each block after three-dimensional reconstruction to obtain the moment, and calculating the amount of water and soil loss according to the three-dimensional point cloud at different moments. The method of the present invention enables observation during rainfall. By taking and calculating digital images of the underlying surface during the rainfall process, the spatiotemporal information of the underlying surface changes during the soil erosion process is extracted to describe the soil erosion process more accurately. At the same time, the present invention can also be applied to the measurement of similar volume changes.

Description

technical field [0001] The invention relates to an image three-dimensional reconstruction technology and a method for measuring water and soil loss. Background technique [0002] The process of soil erosion is the process of interaction between erosive force and the underlying surface. The underlying surface is not only the object of soil erosion, but also the result of soil erosion. At every moment in the process of soil erosion, the soil on the underlying surface Displacement occurs, and the shape of the underlying surface changes. A variety of observation techniques and methods have been developed around the observation of the displacement of the underlying soil and the change of the shape of the underlying surface: [0003] (1) Contact observation method [0004] Use conventional measuring tools such as tape measure, tape measure, and vernier caliper to simply measure the shape change of the underlying surface. Advantages: simple and easy; Disadvantages: low accuracy,...

AI Technical Summary

Problems solved by technology

Advantages: simple and easy; Disadvantages: low accuracy, and can only observe the total amount of soil erosion under rainfall conditions, but cannot observe the variation of soil erosion in different time periods or in different spaces;

Advantages: soil erosion rate and spatial distribution characteristics can be observed; Disadvantages: the observation time interval is too long, and the spatial positioning accuracy is generally above the meter level;

Advantages: high spatial positioning accuracy; Disadvantages: The instrument is not waterproof and cannot be observed during rainfall, and there will be missing measurements in the trench during the gully erosion stage. The biggest defect is that the measurement efficiency is too slow to monitor the dynamic evolution of the underlying surface shape ;

Advantages: simple and easy; Disadvantages: the spatial source of sediment cannot be distinguished;

That is, how to observe and quantitatively express the spatial form of the underlying surface at a set time node with the occurrence and development of soil erosion, and then calculate the amount of soil erosion, sediment transport rate, and erosion rate based on the spatial form of the underlying surface. rate, etc., the above observation techniques and methods have failed to solve this problem well

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