The innovative distributed fiber optic temperature sensor (FO-DTS) measurement technology is used to conduct high-resolution down-hole hydrogeological investigations of contaminated sites in the field. The main advantage of the FO-DTS is the continuous spatial and temporal measurement. Take a 300,000 meter fiber optic cable as an example, the spatial resolution can reach one measurement point per 0.25 meters. After acquiring spatially and temporally high resolution temperature measurement data, the coupled heat and flow numerical model can be used to analyze the downhole permeability of the water through the coupled heat and flow numerical model. In order to have a clearer understanding of the hydrogeological characteristics of a contaminated site, we will use the following methods to understand the characteristics of the contaminated site, such as the section, hydrogeological stratification, groundwater flow direction and velocity, and flow paths. The site has entered the field remediation stage, and is scheduled to use two different FO-DTS technologies, passive and active, for in-situ underground measurements in order to better grasp the detailed characteristics of the hydrogeology and enhance the reference for on-site remediation evaluation. One of the references. The integration of decentralized fiber-optic temperature sensors with high resolution for ambient temperature sensing and the convenience and feasibility of using thermal energy as a groundwater tracer for high resolution hydrological geological surveys at contaminated sites will contribute to the enhancement of our hydrological geological survey capabilities. The investigation and remediation of soil and groundwater contamination will bring new opportunities.

Implemented by Department of Earth and Life Science
Date: 2020/10/08