Method and device for automatically measuring soil infiltration performance based on infrared image

Abstract

The invention belongs to the technical field of surface hydrological process measurement. The invention particularly relates to a method and a device for automatically measuring soil infiltration performance based on an infrared image. The device comprises a peristaltic pump, a target, a point source wetting area, a camera and a computer image processing system, the peristaltic pump is arranged at the water inlet end of the water supply pipeline, the target is arranged near the point source wetting area, the target and the point source wetting area are located on the same plane, and the target is used for image deformation correction and measurement interval space proportion and deformation correction; the camera is fixed on one side of the point source wet area, the shooting center of the lens directly faces the point source wet area, a visible light image and an infrared image can be obtained at the same time, and the shooting center coordinates of the visible light image and the infrared image are the same; and the computer image processing system is electrically connected with the camera through a data line. According to the method, the infrared camera is adopted, the point source infiltration ground surface wet area image is obtained at a fixed time interval, the soil infiltration process curve is obtained, and the soil infiltration performance curve under different background conditions can be accurately measured.

Description

technical field [0001] The invention belongs to the technical field of surface hydrological process measurement. The invention specifically relates to an infrared image-based automatic measurement method and device for soil infiltration performance. Background technique [0002] Soil infiltration has a direct impact on the surface yield during rainfall and the rate at which irrigation water infiltrates the soil. Previous studies have shown that under the condition of water infiltration with constant flow rate, the change process of soil infiltration performance is closely related to the increase process of the wetted area of ​​the wet body on the surface. The relationship of soil infiltration rate with time can be calculated from the change process of soil surface wetted area with time. [0003] At present, in the measurement of soil infiltration performance, the method of measuring the surface wet area mostly adopts the visible light image processing technology. The meth...

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Problems solved by technology

[0006] To sum up, in the existing surface soil wet area measurement methods, the area measurement accuracy of the soil wet area is greatly affected by the background conditions, and when the color difference between the soil wet area and the non-humid area to be measured is small, there will be a large difference. Measurement error

Among the existing soil infiltration performance measurement methods, the wetted area measurement has strict requirements on the environment, and the measurement accuracy is poor

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