Method for determining sandy soil moisture content based on low-frequency ground penetrating radar ground method

Abstract

The invention relates to a method for determining the sandy soil moisture content based on a low-frequency ground penetrating radar ground method, which comprises the determining steps of: collecting ground penetrating radar data by utilizing a together-midpoint method to ensure the travel time of airwaves and ground waves; collecting the radar wave information of a soil section by utilizing a constant spacing method; calculating the dielectric constant of soil; substituting parameters to a formula to obtain the dielectric constant of soil; calculating the water content of soil; substituting the obtained soil dielectric constant epsilon to the formula theta=-5. 3*102+2.92*10-2epsilon-5.5*10-4epsilon2+4.3*10-6epsilon3 to obtain the soil water content. The method for determining the sandy soil moisture content based on a low-frequency ground penetrating radar ground method is suitable to the measurement of the soil water content in farmlands and small river basins, has the advantages of convenience, quick operation, high accuracy and no destruction and is especially suitable to the water content determination of sandy soil.

Description

1. Technical field The invention relates to a method for measuring the water content of a sandy soil profile, in particular to a method for measuring the water content of sandy soil based on a low-frequency ground-penetrating radar ground wave method. 2. Background technology For a long time, the measurement methods of small-scale soil water content are mainly drying method, neutron method, sensor method and time domain reflectometry method. These methods can measure soil water content more accurately, but they all have time-consuming, laborious and It is destructive to the soil and other issues. In the mid-1990s, remote sensing technology began to be applied to soil moisture measurement on a regional scale. This method can quickly measure regional and even global soil surface water content, and has a large amount of information. However, the spatial resolution of remote sensing methods is low, and through Remote sensing data can only estimate soil water content at a depth ...

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Problems solved by technology

The biggest limitation of this method is that the optimal antenna spacing be

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