IEG 환경지질연구정보센터

38

3. 수리지질학 / 지구화학 / 지구물리학 구두발표 / 제3발표장 / 좌장 : 이진용․^이광식․^김기영 10월 28일(금)

Investigation of the Connectivity in Fractured Media through Thermal Tracer Tests with Multi-level Temperature Monitoring Sensors

Taehee Kim

․ Kue-Young Kim

․ Hyun-Jeong Sung

․ Jun-ho Oh

․ Ki-Seong Sung

․Yoosung Kim

1Derpartment of Groundwater and geothermal resources, KIGAM

2Department of Earth System Science, Yonsei University

3Department of Geology and Earth Environmental Sciences, Chungnam University

4Soam Consultant Company Ltd.

[email protected]

Connectivity in fractured media is one of the most interesting and complicated prob- lems in groundwater flow systems. In early stage of researches on the fractured media, it was the most important issues which conceptual models are the most suitable for the ap- proximation to the real groundwater system. There are a plenty of suggested conceptual models for the approximation of the real fractured media; Equivalent porous media mod- el, discrete fracture model, dual porosity model, some hybrid models and so forth.

Nowadays, we have got many achievements related to the fractured media. Among these achievements, percolation model is one of the noticeable. In percolation models, proba- bilities related to the connectivity in fractured media and connectivity itself are the very important concepts. It has been known that Some phenomena related to the connectivity can occur serious problems on real groundwaer system, due to cross-contamination of DNAPL. The objective of this study is the evaluation of the new method for the detailed in- vestigation of the connectivity in fractured media. For this objective, we conducted mul- ti-level thermal tracer tests with double packer system and line type multi-level temper- ature sensors (developed by Soam consultant co. ltd.); 2m interval with 100m length and 0.5m interval with 50m length. 2.5m length intervals at injection wells were isolated with double packer and warmer water than groundwater was injected into the isolated interval.

And the variations of temperature were monitored with line type multi-level temperature sensors at monitoring wells. It was confirmed that newly developed method in this study was very useful to quantitatively identify the connectivity in fractured media.

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