Imaging and tracing system and method for measuring soil solute migration

Abstract

The invention relates to the technical field of tracing and imaging of images, in particular to an imaging and tracing system and an imaging and tracing method for measuring soil solute migration. The system comprises a touch screen, a display unit, an electric signal triggering unit, a multipath control unit, an operation processing unit, a measuring and controlling unit and a measuring electrode, wherein the display unit is connected with a single board computer of the operation processing unit through a low voltage differential signaling (LVDS) / transistor-transistor logic (TTL) digital display interface; a controller on the touch screen is connected with a universal serial bus (USB) interface of the single board computer through a USB interface; and the measuring and controlling unit is connected with the single board computer of the operation processing unit through an RS232 serial communication interface, drives the multipath control unit through a digital output port and controls the electric signal triggering unit to access the multipath control unit. The system and the method have the advantages of suitability for various types and various concentrations of solutes and capability of measuring of large-size and small-size permeation models, reflecting a corresponding relation between the concentration and the specific resistance of the solute, enhancing the reliability of the system and meeting the measuring requirement of long-term imaging and tracing of solute migration.

Description

technical field [0001] The invention relates to the technical field of image tracing and imaging, in particular to an imaging tracing system and method for measuring soil solute migration. Background technique [0002] The study of water flow and solute transport in the unsaturated zone of soil is an important topic that must be carried out to maintain the sustainable development of agriculture, natural resources (soil and water, etc.) and the environment. There is a close link between soil flow and solute transport modeling methods and measurement methods. Existing soil water and solute monitoring theories and methods are more focused on the observation of soil moisture content and solute content (concentration), and soil moisture content and concentration can only provide a value (or average value) at a depth position. Misestimation of migration characteristics, wrong model predictions, and misleading risk assessment schemes, although it is possible to set up soil moistur...

AI Technical Summary

Problems solved by technology

However, there are still many problems in this method for measuring non-uniform flux under unsaturated conditions. Only through a global measurement method can we effectively grasp the characteristics of non-uniform flow, and then make accurate and reasonable predictions for the migration of polluting solutes

Under non-uniform flow conditions, the temperature field due to the heat source will also greatly affect the flow flux field, which will also have a significant impact on the prediction results

At the same time, it is very difficult and expensive to directly measure soil hydrological parameters in unsaturated environments

[0004] Due to the complexity of the theory of soil solute migration, there are currently no products specifically for soil solute migration imaging. The traditional solute migration measurement method uses soil sampling, and the lysimeter method cannot obtain the infiltration process of the solute from a global and real-time perspective; the high-density electrical resistance meter The application in engineering is limited to the measurement of resistivity, and the solute concentration-resistivity model cannot be established, and the infiltration process cannot be analyzed by imaging. Therefore, it is necessary to study an imaging device specifically for soil solute infiltration

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