• Title/Summary/Keyword: KIGAM

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A Groundwater Potential Map for the Nakdonggang River Basin (낙동강권역의 지하수 산출 유망도 평가)

  • Soonyoung Yu;Jaehoon Jung;Jize Piao;Hee Sun Moon;Heejun Suk;Yongcheol Kim;Dong-Chan Koh;Kyung-Seok Ko;Hyoung-Chan Kim;Sang-Ho Moon;Jehyun Shin;Byoung Ohan Shim;Hanna Choi;Kyoochul Ha
    • Journal of Soil and Groundwater Environment
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    • v.28 no.6
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    • pp.71-89
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    • 2023

  • A groundwater potential map (GPM) was built for the Nakdonggang River Basin based on ten variables, including hydrogeologic unit, fault-line density, depth to groundwater, distance to surface water, lineament density, slope, stream drainage density, soil drainage, land cover, and annual rainfall. To integrate the thematic layers for GPM, the criteria were first weighted using the Analytic Hierarchical Process (AHP) and then overlaid using the Technique for Ordering Preferences by Similarity to Ideal Solution (TOPSIS) model. Finally, the groundwater potential was categorized into five classes (very high (VH), high (H), moderate (M), low (L), very low (VL)) and verified by examining the specific capacity of individual wells on each class. The wells in the area categorized as VH showed the highest median specific capacity (5.2 m3/day/m), while the wells with specific capacity < 1.39 m3/day/m were distributed in the areas categorized as L or VL. The accuracy of GPM generated in the work looked acceptable, although the specific capacity data were not enough to verify GPM in the studied large watershed. To create GPMs for the determination of high-yield well locations, the resolution and reliability of thematic maps should be improved. Criterion values for groundwater potential should be established when machine learning or statistical models are used in the GPM evaluation process.

  • https://doi.org/10.7857/JSGE.2023.28.6.071 인용 PDF HTML

The status of digital geological mapping and Clearing House in Korea

  • Yeon, Young-Kwang;Han, Joung-Kyu;Chi, Kwang-Hoon
    • Proceedings of the KSRS Conference
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    • 2002.10a
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    • pp.168-168
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    • 2002

  • KIGAM(Korea Institute of Geoscience and Mineral Resources) has finished to digitalize geological maps of 1/50, 000 scales in 1999. This project is supported by the Korea Ministry of Information and Communication under the name of "Knowledge and Information Resources Management Project". And via geo-clearing house, KIGAM has begun to sale the geological maps that are modified more correctly now June, 2002. The objective of this paper is to evaluate the status of digital geological mapping in Korea. And to introduce Clearing House and future plans of KIGAM.

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Site Investigation of Abandoned Coal Mine and Stability of Road Tunnel (도로터널공사구간의 폐갱도 정밀조사 및 터널의 안정성 평가)

  • Shin, Hee-Soon;Kim, Jung-Yul;Lee, Byung-Joo;Han, Kong-Chang;Sunwoo, Choon;Song, Won-Kyung;Synn, Joong-Ho;Kim, Yoo-Sung;Park, Chan
    • Proceedings of the Korean Geotechical Society Conference
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    • 2001.03a
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    • pp.17-24
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    • 2001

  • Several underground cavities were found during construction of a road tunnel in 600m length . The area belong to Whasoon coalfield where extensive ground subsidences have occurred. It is necessary to find other underground cavities which might be located just near the road tunnel for safety, The field surveys and laboratory tests were conducted such as surface geological survey(672m), surface reflection seismic exploration(399m), drilling test(3 NX holes), 9 laboratory tests for rocks, 3 boreholes televiewer tests, reflection seismic exploration in tunnel(2, 342m). To estimate the effects of underground cavities on the road tunnel, 3 geological section were analysed with FLAC-2D modeling. The effects of the ground reinforcement were also analysed.

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