• Title/Summary/Keyword: Mountain slope

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A Case Study Of Stability Examination About Slope Under Pier (교각 하부사면에 대한 안정성 검토 사례연구)

  • Bae, Sung-Woo;Shin, Chang-Gun;Seo, Jeong-You
    • Proceedings of the Korean Geotechical Society Conference
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    • 2010.09a
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    • pp.712-721
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    • 2010
  • Our country is composed of about 70% mountain district. Therefore the tunnel and the bridge are used plentifully in the road. The bridge the establishment location of the pier according to ground condition and the route is executed from various condition. this study leads and stability investigation and reinforcement instance there is a goal which presents an example about investigation.

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Safety Assessment to Construction Position of Constructed Steel Structures under Declinating Earth Pressure (편토압을 받는 파형강판 구조물의 시공위치별 안전성 평가)

  • Lee, Sang-Hyun;Lim, Heui-Dae
    • Journal of the Korean Society of Safety
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    • v.23 no.1
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    • pp.28-34
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    • 2008
  • The corrugated steel plate structures is applied to the construction of mountain tunnel portal part with shallow depth, the tunnel on the outskirts of urban areas and ecology move passage. In this study, A finite element method is used for research the behavior of corrugated steel plate structures due to construction position under declinating earth pressure and excavation depth. A finite element method were performed varying construction position(10, 15, 20 and 25m) from slope and excavation depth from surface. The hoop thrust and moment, displacement of corrugated steel plate subjected to construction position and excavation depth is determined from a finite element method. From results of finite element method, it was found that the increase of thrust and the decrease of displacement as the amount of distance increase from slope with construction position. But the thrust and moment, displacement has not different value with excavation depth.

Floristic Composition and Vertical Distribution of Mt. Daesun (대둔산 식물의 분류학적 특성과 수직분포)

  • Cho, Joong Bae;Bong-Seop Kil
    • The Korean Journal of Ecology
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    • v.10 no.2
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    • pp.53-62
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    • 1987
  • Floristic composition and vertical distribution of Mt. Daedun (western slope) were investigated from 1985 to 1986. The results are as follows; 108 families, 346 genera, 511 species, 2 subspecies, 75 varieties, 5 forma or 593 taxa including 77 cultivars. The floral data showed the ecological characteristics such as the value 346 in Fisher's Index, H-D1-H5 in biological type, 10.9% in urban index of naturalized plants and 60.5% in erect form growth form. Based on the physiognomy and population density of dominant tree species the forest vegetation of Mt. Daedun (western slope) was classified into 5 types; Quercus mongolica forest and Q. variabilis forest at 800m above, Carpinys laxiflora forest and Acer mono forest at 700m to 800m and Sapium japonicum forest at 500m to 800m in altitude. And Lindera erythrocarpa forest and zelkova serrata forest are widely distributed at 400m to 800m in altityde along valley and at mountain foot area.

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A Study on the Distribution of Pinus thunbergii in the Korean Peninsula (한반도의 곰솔분포에 관한 연구)

  • Kim, Jung Un;Bong-Seop Kil
    • The Korean Journal of Ecology
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    • v.6 no.1
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    • pp.45-54
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    • 1983
  • A distribution map of black pine, Pinus thunbergii, in south Korea was prepared through field surveys. According to Mirov(1967), the range of black pine is limited in east Asia, Japan and Korea; its northern limit is at about 41。34' north and its southern limit on Takara island, south Kyushu, at 29。 north. According to the present map, its northern limit coincided with the isopath of warmth index 100 by Yim(1977). The density of pine in grid mesh, about 4 km * 4 km, was higher at costal area than that in inland area, and it was also higher at sea side slope than the opposite slope of the same mountain. This suggests that the ecological distribution of black pine is greatly affected by salt content of the soil or the optimal range of summed temperature for the pine growth.

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A Study on Analysis of Damages due to Debris Flow at Jecheon in 2009 (2009년 발생한 제천시의 토석류 피해분석에 관한 연구)

  • Yoo, Nam-Jae;Choi, Young-June;Lee, Cheol-Ju
    • Journal of Industrial Technology
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    • v.30 no.A
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    • pp.95-101
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    • 2010
  • This paper is results of case study on characteristics of debris flow occurred at Jecheon during a heavy rainfall in 2009. The site studied is the mountain area located at Palsong-ri Bongyang-op in Jecheon-si where serious damages due to debris flow were occurred by heavy rainfall during July 7 to July 16 in 2009. Intensity and duration of rainfall causing debris flow were analyzed on the basis of AWS data. Characteristics of debris flow such as initiation, transportation and deposition were investigated through field reconnaissance. The geological and topographical characteristics of slope where debris flow was triggered were figured out and characteristics of erosion on the bottom and sides of valley during transportation of debris flow were also investigated. The slope and boundary of valley where the debris flow started to be deposited were studied.

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Vegetation of Alpine Grassland at Northwest Slope on Mt. Paektu in China (중국측 백두산 서북사면 고산초원의 식물상)

  • 이성규
    • Journal of The Korean Society of Grassland and Forage Science
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    • v.21 no.3
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    • pp.129-136
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    • 2001
  • The alpine grassland vegetation at the northwest slope of Mt. Paektu were investigated by Penound- Howard's cover-degree method. The floristic composition of the alpine grassland from 2,100m altitude to the top of mountain were 35 species, 1 subspecies, and 6 varieties, and most of the plants were short p e r e ~ i a l herbs and shrubs. The dominant species of the vegetation distributed along to altitude were Rhododendron aureum (2,100-2,20Om), Dryas octopetala var. asiatica(2,200-2,30Om), Dryas octopetala var. asiatica(2,300-2,40Om), Rhododendron aureum- Rhododendron redowskianum(2,400-2,50Om), and Rhododendron redowskianum(2,500- 2,58Om), respectively. Characteristics of the shrub plants which settled in alpine grassland showed uniform low height(3-15cm), creeping stem and evergreen leaf. Life form of the plants were 29 species of Hemicryptophyte, 8 species of Chamaephyte, 1 species of Geophyte, and 5 species of Phanerophyte. (Key words : Alpine grassland, Mt. Paektu, Altitude, Dominant, Life form)

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An Analysis of Multi-path Propagation Characteristics Using DTM : Considering Slope of the Ground Surface (DTM을 이용한 다중경로 전파특성 분석 : 지면의 경사를 고려한 해석)

  • Lim, Joong-Soo;Chae, Gyoo-Soo;Kim, Min-Nyun
    • Journal of the Korea Institute of Military Science and Technology
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    • v.10 no.3
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    • pp.71-78
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    • 2007
  • We suggest a multi-path propagation analysis method using DTM(Digital Terrain Map). Generally, the total signal strength at a target is calculated by adding the field propagated in free space and the field reflected from the ground surface. In this paper, we also consider the vertical reflections associated with the vertical surfaces such as precipitous cliffs and electricity pylons in the mountain area. In addition, we primarily take account the main slope of the ground surface to improve the accuracy of the total field density at the target.

Landscape Fragmenation of Forest of the Cropland Increase Using Landsat Images of Manpo and Gangae, Jagang Cities, Northwest Korea (위성영상 분석에 의한 만포-강계 지역 경지확대에 따른 산림경관 변화)

  • Lee, Min-Boo;Kim, Nam-Shin;Choe, Han-Sung;Shin, Keun-Ha;Kang, Chul-Sung;Han, Uk
    • Journal of the Korean association of regional geographers
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    • v.9 no.4
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    • pp.481-492
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    • 2003
  • This study aims to analyze quantitatively changes of forest and cropland landscape due to cropland increase toward higher mountain slope during 9 years from 1993 to 2002, using Landsat images and field survey in the vicinity of Manpo and Gangae cities, Jagang Province, Northwest Korea, During 9 years, cropland has increased as 49.9%, forest area decreased as 16%. The spatial characteristics of cropland changes present that average elevation of cropland are increased from 381m of 1993 year to 412m of 2002 year, and average gradient increased from 1010 to 1313. In increased area of cropland during 9 years, the average elevation is 455m, and average gradient is 1515 with maximum gradient 7070. Analysis of the patch phenomena by fragmentation of vegetation landscape show that number of patch increased from 394 to 1,241 and also values of shape index, and fractal dimension of vegetation are increased slightly, during 9 years. Croplands have developed mainly in mountain slopes of elevation between 450 to 750m. For improvement of agricultural productivity, it should be required political and social stabilization, international and South Korea's assistance, and restoration of mountain forest.

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Petrological Classification and Provenance Interpretation of the Sungnyemun Stone Block Foundation, Korea PDF icon (숭례문 육축 구성석재의 암석학적 분류와 원산지 해석)

  • Jo, Young Hoon;Lee, Chan Hee;Yoo, Ji Hyun;Kang, Myeong Kyu;Kim, Duk Mun
    • Korean Journal of Heritage: History & Science
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    • v.45 no.3
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    • pp.174-193
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    • 2012
  • This study focused on distribution ratio of stone properties based on material characteristic analysis, provenance presumption and transportation route interpretation of the Sungnyemun stone block foundation. The stone block foundation is composed of pinkish granite (56.0%), reddish granite (4.5%) and leucocratic granite (26.2%) of original stones and pinkish granite of new stones(13.3%). The rock-forming minerals for granites are consisted mainly of quartz, alkali-feldspar, plagioclase and biotite, and are similar geochemical evolution trend of major, rare earth, compatible and incompatible elements. Therefore, it is clear that the rocks are genetically same origin. As a result of magnetic susceptibility measurement, the pinkish and reddish granite of original stones and pinkish granite of new stones showed normal distribution around about 4.00(×103SIunit×103SIunit). But the leucocratic granite of original stones were confirmed ilmenite series under about 1.00(×103SIunit×103SIunit). As a result of provenance interpretation and transportation route analysis based on the petrological results, the provenance of pinkish granite and reddish granite of original stones are presumed the north slope in Namsan mountain and Naksan mountain. Also, the leucocratic granite of original stones and the pinkish granite of new stones are strongly possible furnished from the south and north slope in Namsan mountain and Naksan mountain, respectively.

Vegetation of Daecheong-bong. Mt. Seolag (설악산 대청봉의 식생)

  • Baek, Soon-Dal;Yang-Jai Yim
    • The Korean Journal of Ecology
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    • v.6 no.1
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    • pp.1-13
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    • 1983
  • A survey was conducted on the vegetation of southern slope of Daecheong-bong, Mt. Seolag, Located at the northern part of Taebaek mountain chain in the Central Korea. The altitudinal zonation of the vegetation was analyzed by distribution pattern of dominant species along thermal gradient, In additiion to these procedure th plant sociological studies by Braun-Blanquet(1964) were carried out. It was recognized that the vegetation is consist of 16 associations including Quercus mongolica-Lindera obtusiloba. association and the forest zone is classified into southern, central and northern part of cool temperate forest and subarctic forest.

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