한국산림과학회지 (Journal of Korean Society of Forest Science)

  • 제108권2호
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  • Pages.216-223
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  • 2019
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  • 2586-6613(pISSN)
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  • 2586-6621(eISSN)
한국산림과학회 (Korean Society of Forest Science)
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경상북도 경주시 양북면 땅밀림지의 지질 및 토양물리성의 변화

The Geology and Variations of Soil Properties on the Slow-moving Landslide in Yangbuk-myun, Gyungju-si, Gyeongsangbuk-do

  • 박재현 (경남과학기술대학교 산림자원학과) ;
  • 박성균 (경남과학기술대학교 산림자원학과)
  • Park, Jae-Hyeon (Department of Forest Resources, Gyeongnam National University of Science and Technology) ;
  • Park, Seonggyun (Department of Forest Resources, Gyeongnam National University of Science and Technology)
  • 투고 : 2018.11.05
  • 심사 : 2019.01.28
  • 발행 : 2019.06.30
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초록

이 연구는 경상북도 경주시 양북면 일원의 산지 땅밀림의 지질특성 및 땅밀림 후 변화되는 토양의 물리적 특성을 구명하고자 수행하였다. 조사지역의 지질은 생성시대가 백악기의 경상누층군으로 주된 구성 암석은 흑색셰일이며, 동쪽으로는 석영 장석질 반암이 분포하고, 그보다 아래쪽은 제4기 연일층군 역암이 분포한다. 암석은 매우 풍화된 풍화암의 형태를 나타내고 있어 땅밀림 지질로 나타났다. 땅밀림으로 무너진 최대 깊이는 12.0 m까지 붕적층으로 구성되어 있다. 땅밀림 방향은 비탈면 하부는 $N46^{\circ}E$, 땅밀림지 상단부는 $N62^{\circ}E$로 절리 및 주향 방향으로 발생하였다. 땅밀림으로 교란된 토양에서는 토양깊이 20 cm 까지는 토양경도가 기록되지 않는 완전교란상태이었고, 토양깊이 25 cm~90 cm까지는 자연산림지 및 교란이 발생되지 않은 지역에 비해 토양경도는 1.4~-4.7배 낮게 나타났다. 또한 땅밀림지역의 토양용적밀도는 $1.24{\sim}1.29g/cm^2$로 자연산림지보다 각각 약 1.6배 높게 나타났다. 토양의 공극률은 51.5~53.3%로 자연산림지보다 각각 약 1.3~1.4배 낮았다. 흑색 셰일지역의 토양투수계수는 8.75E-06 cm/s, 토양의 조공극률은 9.8%로 가장 낮게 나타났다.

This study was conducted to measure the changes in the geological and soil properties following slow-moving landslide events in Yangbuk-myun and Gyungju-si, Gyeongsangbuk-do, South Korea. The geological characteristics of the study site comprised black shale in the Gyeongsang nodal group formed in the Cretaceous period and quartz feldspar carcinoma in the east side with conglomerate in the Yeonil group formed in the Quaternary period. The study site exhibited the geologic characteristics of a slow-moving landslide with severely weathered rocks. The maximum collapsing depth of the slow-moving landslide was 12.0 m with colluvial deposits. The strike and joint aspects in the slope areas of the slow-moving landslides were $N46^{\circ}E$ in lower slope and $N62^{\circ}E$ in upper slope, respectively. Soil hardness of ${\leq}20cm$ deep was not measured because of the completely disturbed soil resulting from soil creeping. Soil from 25 to 90 cm deep was 1.4-4.7 times softer in the slow-moving landslide areas than in the undisturbed or natural forests. Soil bulk density was $1.24-1.29g/cm^3$ in land creep areas. Soil bulk in both areas was 1.6 times denser than that in the natural forest. The soil pore space was 51.5-53.3% in the land creep areas. The values are 1.3-1.4 times lower than those within the natural forest. Black shale areas showed the lowest coefficient of permeability (8.75 E-06 cm/s) and mesopore ratio (pF 2.7: 9.8%) compared with those resulting from other study areas.

키워드

HOMHBJ_2019_v108n2_216_f0001.png 이미지

Figure 1. Location map of the study site.

HOMHBJ_2019_v108n2_216_f0002.png 이미지

Figure 2. Distribution of black shale in the slow – moving landslide area.

Table 1. Results of soil bulk density (g/cm3) and soil porosity (%).

HOMHBJ_2019_v108n2_216_t0001.png 이미지

Table 2. Results of soil hardness (kgf/cm3)

HOMHBJ_2019_v108n2_216_t0002.png 이미지

Table 3. Results of coefficient of permeability (cm/s) and mesopore ratio (pF2.7, %)

HOMHBJ_2019_v108n2_216_t0003.png 이미지

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