Method of measuring seepage flow velocity by electrolytic polarization

Abstract

The invention discloses a method of measuring a seepage flow velocity by electrolytic polarization. The method comprises the following steps of arranging an electrolysis electrode used for generating the electrolytic polarization to form ionic pulses; arranging a conductivity electrode used for measuring system conductivity to sense the change of ionic concentration; applying a direct voltage to the electrolysis electrode for a certain time, and at the same time drawing a conductivity change curve through conductivity change measured by the conductivity electrode; on the conductivity change curve subjected to smoothing, taking the time that the electrolysis electrode starts to apply the direct voltage as a zero point to solve the time that a conductivity maximum value or a conductivity minimal value occurs; measuring a flow velocity according to the time the conductivity extreme values occur and calculation of electrode spacing of the two electrodes; calculating an actual flow velocity according to a correction coefficient a and a compensating factor b which are measured by calibration. The method provided by the invention is simple and convenient to operate; no new objects are introduced in a tracer process; no environment pollution exists; the measuring distance required by the method is short; velocity components in multiple directions can be measured at the same time, and a continuous measurement method is provided for seepage monitoring.

Description

Technical field [0001] The invention relates to the technical field of rock and soil seepage monitoring, in particular to a method for electrolytic polarization to measure seepage flow velocity. Background technique [0002] Seepage flow direction and velocity are very important parameters in the fields of geotechnical engineering and hydrogeology. They are also of great significance for the study of pollutant migration, oil and gas development, soil erosion and other related issues. In traditional tracing methods, since the tracers are mostly dyes or electrolyte solutions, special dosing devices are required, and the dosing point and the measurement position must be separated by a long distance, which is difficult to design as an integrated sensor to achieve continuous monitoring; thermal tracing is measured by The temperature field changes to determine the flow rate and direction of seepage. The optical fiber temperature and seepage monitoring system is a typical representative...

AI Technical Summary

Problems solved by technology

In the traditional tracer method, since the tracer is mostly a dye or an electrolyte solution, a special dosing device is required, and the dosing point and the measurement location must be separated by a long distance, so it is difficult to design an integrated sensor to achieve continuous monitoring; The temperature field changes to determine the seepage velocity and flow direction. The fiber optic temperature measurement and seepage monitoring system is a typical representative of this type. Since the fiber optic temperature measurement and seepage monitoring system needs to lay optical fibers within the monitoring range, the cost is relatively high

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