MONITORING THE DIRECTION AND VELOCITY OF GROUNDWATER FLOW

MONITORING THE DIRECTION AND VELOCITY OF GROUNDWATER FLOW

MONITORING THE DIRECTION AND VELOCITY OF GROUNDWATER FLOW

25/05/2021

Monitoring the direction and velocity of groundwater flow, combined with documents and field pumping experiments, is one of the important tasks in hydrogeological investigation, especially in related issues. related to the transport, dispersion of pollutants in the underground water environment, etc. Here is a method of monitoring that we have the opportunity to work with Japanese experts - ASANO TAISEIKISO ENGINEERING Co.Ltd (ATK).

1. Monitoring equipment

The monitoring of the velocity and direction of underground water flow is carried out by the "Groundwater flow meter" equipment system developed by the Central Power Industry Research Institute and Taisei-Kiso-Sekkei Corporation.

2. Working principle

This probe detects the change of a specific resistance in a limited space of the probe. This space is called the electrode section and contains 13 electrodes; 12 of them are placed radially on the circumference of a circle with a diameter (30 - 60mm), and an electrode in the center (Figure 2).

In this space, a solution of distilled water – considered a tracer (whose resistance is adjusted greater than that of groundwater) is placed into the pipe of the central electrode. As groundwater flows into the electrode section, continuous measurements are made in each of the 12 electrode sets for the specific resistance changes that occur during the replacement of the marker solution by groundwater flow. The time-specific change in resistance was detected as the difference in potential (ΔV) between the center electrode and each of the 12 surrounding electrodes by the data logger.

3. Data Analysis

For data analysis, the tracer was initially placed on a cylindrical electrode that was transported with a groundwater flow between the distance Δx from the central electrode (where ΔV=0) to the surrounding electrodes equal to the process. dispersion process. In principle, ΔV becomes maximum when the trace beam of the tracer is at the center of Δx .

Therefore, for laminar flow, the average flow rate in the electrode section is calculated according to the following equation:

                                                                         V o  = x / (2Δt)

 

Inside:

o  is the velocity in the electrode part

Δx is the distance between the center electrode and the surrounding electrodes

t is the time at which V becomes maximum

It is a pleasure to cooperate and work with the company ASANO TAISEIKISO ENGINEERING Co.Ltd (ATK).

  - References:

Kawanishi, M. & Komatsuda, S. & Hirata, Y. (1986). Investigation on Velocity and direction of Groundwater Flow by Current Meter in single Well. Proceeding of 30 th  Conference on Hydraulic Engineering, 337-342, Japanese Society of Civil Engineering, Japanese

M. Kawanishi, K. Miyakawa, Y. Hirata Development and application of groundwater Flow meter in fractured rocks: measurement of Velocity and direction of groundwater flow in Single well.

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