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Research Article

Analysis of Characteristics Using Drilling Data and Topographic Wetness Index of the Jinju Landcreep Area

진주 땅밀림지의 시추 데이터와 지형습윤지수를 활용한 특성 분석

Jaehyeon Park1
,
Sanghyeon Lee2*
박 재현1
,
이 상현2*
1Professor, Division of Environmental and Forest Science, Gyeongsang National University
2Master’s Student, Division of Environmental and Forest Science, Gyeongsang National University
1경상국립대학교 환경산림과학부 교수
2경상국립대학교 환경산림과학부 석사과정
*Corresponding Author
31 March 2025. pp. 23-39
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Abstract

This study investigated the geology, topographic wetness index and drillhole data to identify the direction and risk areas of landcreep in the Banjiri, Micheon-myeon, and Jinju areas. Landcreep is a disaster in which the entire soil layer slides due to groundwater within the slope. These areas do not have a valley at the base of slopes and the landform type is bulging terrain. The geological era is represented by the cretaceous period of the cenozoic era, specifically the gyeongsang supergroup, and the rock types include sandstone, mudstone, and shale, which are susceptible to landcreep. The direction of groundwater flow coincides with the orientation of anomalous tree growth, groundwater outflow and collapse of stone walls related to land creep. The topographic wetness index (TWI) values are indicative of a first-order stream, despite the absence of a valley. Past aerial photographs revealed that points with high TWI values had experienced collapse. Therefore, based on these factors, the determination of the direction of landcreep can assist in identifying sites that require stabilization work and establishing evacuation procedures.

Keywords
landcreep
TWI
drilling survey
groundwater outflow
anomalous feature

본 연구는 진주시 미천면 반지리에서 발생한 땅밀림지의 지질 ‧ 지형, 이상징후, 시추조사, 지형습윤지수 등 몇 가지 요인분석을 통해 효율적으로 땅밀림 진행방향과 위험지를 판정하였다. 땅밀림은 사면 내부의 지하수로 인해 토층 전체가 미끄러지는 재해이다. 이 지역은 사면 내 계곡부가 존재하지 않으며 산지 유형은 볼록한 지형으로 나타났다. 지질시대는 신생대 백악기로 경상누층군으로 나타났으며, 암상은 사암, 이암 셰일로 땅밀림에 취약한 지질로 나타났다. 지하수가 흐르는 방향과 수목 휨 현상, 지하수 유출, 돌담 배부름 현상이 나타난 방향이 일치하는 결과를 나타냈으며, 지형습윤지수 분석결과 계곡부가 없음에도 1차 유로와 비슷한 수치를 나타내었으며, 과거 항공사진에서는 지형습윤지수가 높게 나타난 지점이 붕괴됨을 파악할 수 있었다. 따라서 시추 및 땅밀림 이상징후, 지형습윤지수 등 몇 가지 요인을 분석하여 땅밀림 진행방향을 파악함으로써 안정공사 위치선정과 재빠른 경계 피난 대책을 수립할 수 있을 것으로 판단된다.

키워드
땅밀림
지형습윤지수
시추조사
지하수 유출
이상현상
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 35
  • No :1
  • Pages :23-39
  • Received Date : 2025-01-24
  • Revised Date : 2025-02-18
  • Accepted Date : 2025-02-19
  • DOI :https://doi.org/10.9720/kseg.2025.1.023
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