Novel tracing method and device based on electromagnetic field

Abstract

The invention discloses a novel tracing method and device based on an electromagnetic field. The device comprises an electromagnetic transmitting system, a transmitting antenna, electrodes and a receiver. The electromagnetic transmitting system is arranged at an upstream point and comprises a transmitter and a generator, and the transmitter comprises a capacitor; the transmitting antenna adopts aspecially designed multi-frequency transmitting antenna, and penetrates through karst collapse or a drill hole to go deep into a detected aquifer; the electrodes and the receiver are arranged at a downstream point, the electrodes comprise two pairs of electrodes, the two pairs of electrodes are orthogonally distributed, and the electrodes are located in a cofferdam formed by downstream water; andthe receiver collects electric signals in the electrodes. Based on good conductivity of water, an electromagnetic signal can be used as a tracer agent to realize rapid observation, and compared with atraditional tracer agent, the electromagnetic signal is extremely high in propagation speed in water, stable in property and free of pollution, can be applied to underground water tracer detection, and solves the problems of poor timeliness and environmental pollution of the tracer agent in the traditional tracer detection.

Description

technical field [0001] The invention relates to the field of connection detection of groundwater systems in hydrogeological surveys, or the field of leakage or piping detection of dams, or the field of detection of karst passages under complex geological conditions in underground space construction, and specifically relates to a new type of tracing method based on electromagnetic fields and devices. Background technique [0002] Groundwater tracer is an important field detection method for studying groundwater movement, which can be divided into two types: natural tracer and artificial tracer. Among them, the widely used artificial tracer method often uses radioisotope tracer logging and groundwater connection tracer methods to study underground hydraulic systems. [0003] At present, the main method to determine the hydraulic connection of the groundwater system is to connect the groundwater to trace the source of the water movement, receive and detect it at the expected r...

AI Technical Summary

Problems solved by technology

[0012] (1) Rely on tracers, polluting or harmful

[0013] Currently commonly used tracers mainly include isotopes, ordinary pigments, fluoresceins, radioactive indicators, etc. Such substances are likely to cause damage to groundwater, soil, and plants, pollute the environment, and do not meet environmental protection requirements; at the same time, the tracers have poor stability. , the detection results are greatly affected by human factors, cannot adapt to complex geological environments, and cannot meet the requirements of large-scale connected detection

[0014] (2) The observation time is long, the timeliness is poor, and it takes a long time

[0015] The movement speed of the tracer in the water is too slow, especially in large-scale water-bearing channels, and the observation results are often obtained one day or even several days after being put in. It is impossible to grasp the scale and development of the water-bearing channels in time, and the timeliness is poor.

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