• Title/Summary/Keyword: 지온경사율

Search Result 9, Processing Time 0.027 seconds

Relationship Analysis between Lithology, Geological time and Geothermal Gradient of South Korea (남한지역의 암상 및 지질시대별 지온경사율 관계 분석)

  • 김형찬;이사로;송무영
    • Economic and Environmental Geology
    • /
    • v.35 no.2
    • /
    • pp.163-170
    • /
    • 2002
  • The purpose of this study is to analyze the relationship between geology and geothermal gradient in South Korea using GIS. For the analysis, 352 temperature logging wells were constructed to spatial database and the relationships beween geothermal gradient and geological time and lithology were analyzed using the overlay the wells layer and 1:1,000,000 scale geological map layer. The average of the geothermal aradient of South Korea is 29.34$^{\circ}C$/km. In the geologic sequence, Cenozoic strata has 39.7$0^{\circ}C$/km, Mesozoic strata has 30.63$^{\circ}C$/km , Paleozoic strata has 22.32$^{\circ}C$/km, Proterozoic strata 23.15$^{\circ}C$/km geothermal gradient value. In the lithological aspect, plutonic rocks 33.96$^{\circ}C$/km, sedimentary rocks have 24.78$^{\circ}C$/km and sedimentary and volcanic rocks have 26.85$^{\circ}C$/km geotermal gradient value. The result can be used to develop geothermal energy and hot spring as a reference.

Effects of Shading Rate and Method of Inside Air Temperature Change in Greenhouse (차광율 및 차광방법이 온실내부의 온도변화에 미치는 영향)

  • 이석건;이현우;김길동;이종원
    • Journal of Bio-Environment Control
    • /
    • v.10 no.2
    • /
    • pp.80-87
    • /
    • 2001
  • This study was conducted to provide basic data for the design of shading facility of greenhouse. The proper distance between external shading screen and roof surface, transmissivity of shading materials, and shading effects of external and internal shadings were analyzed. About a distance of 10 cm between inclined external shading screen and roof surface was enough to guarantee the external shading effect in the greenhouse without roof vent. The inside temperature of greenhouse installed with 85% internal shading screen was lower the maximum of 4$^{\circ}C$ and mean of 2$^{\circ}C$ than that with 55% internal shading screen in both natural ventilation and no ventilation condition. The difference of soil temperature between shading and no shading greenhouse was great, but the difference by shading rate or shading method was small. The performance of external shading for controlling inside temperature down was superior to that of the internal shading. The externally inclined shading screen parallel to the roof surface of greenhouse was more effective than the externally horizontal shading screen in controlling inside temperature of greenhouse without roof vent.

  • PDF

Design of Geothermal Resource Information System (지열자원 정보시스템의 설계)

  • Baek, Seung-Gyun;Kim, Hyoung-Chan;Park, Jeong-Min
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 2008.05a
    • /
    • pp.646-649
    • /
    • 2008
  • 최근 유가 폭등으로 관심이 고조되고 있는 청정 재생에너지인 지열자원의 효과적인 개발 및 활용을 위하여 그동안 축적된 지열조사 및 연구정보를 체계적으로 저장,관리, 도시할 수 있는GIS기반의 지열자원 정보시스템을 개발하고자 하였다. 이를 위하여 열물성, 지온경사, 지열류량, 열생산율, 열부존량 등 지열조사 자료를 수집 및 분석하여 공간적 특성과 역할에 따라 기본정보, 참조정보, 분석정보, 부가정보의 4개 자료군, 39개 단위데이터로 분류하였고, 각 단위데이터의 속성 선정과 연계를 위한 GIS 데이터 모델링을 통하여 공간데이터베이스를 설계하였다. 지열자원 정보시스템은 도면표시, 자료조회, 분석/통계등 전반적인 GIS 기능을 이용하여 지열자료의 조회 및 분석이 용이하도록 설계하였다.

  • PDF

Effects of Shading Rate and Method on Inside Air Temperature Change in Greenhouses (차광율 및 차광방법이 온실내부의 온도변화에 미치는 영향)

  • 이현우;이석건;김길동;이종원
    • Proceedings of the Korean Society for Bio-Environment Control Conference
    • /
    • 2001.04b
    • /
    • pp.27-28
    • /
    • 2001
  • 온실의 차광설계에 필요한 기초자료를 제시하기 위하여 온실모형과 실험온실을 이용하여 외부차광재의 적정 설치간격 분석, 차광재별 광투과율 분석, 차광율에 따른 온실내부온도의 변화 분석, 차광이 온실내부의 지온변화에 미치는 영향분석 및 외부차광과 내부차광의 차광효과 비교를 실시하였다. 외부경사차광시 온실 지붕과 차광재의 설치간격은 10-30cm에서 차광효율이 가장 좋은 것으로 나타났으나 환기창의 개폐를 위한 공간이 필요하지 않는 온실에서는 10cm 정도이면 충분한 간격이 될 것으로 판단된. (중략)

  • PDF

Effects of Mulching Practices on Soil Temperature and Soil Physical Properties (Mulching방법별(方法別) 토양온도(土壤溫度)와 토양물리성(土壤物理性) 변화(變化))

  • Jung, Pil-Kyun;Lee, Kwang-Seek;Ko, Mun-Hwan;Um, Ki-Tae;Ha, Ho-Seong
    • Korean Journal of Soil Science and Fertilizer
    • /
    • v.18 no.4
    • /
    • pp.366-372
    • /
    • 1985
  • Soil temperatures and soil physical properties were investigated in order to better understand the effects of mulchings in the red pepper field. The red pepper was planted in the lysimeter installed at the Yesan sandy loam with 20% slope and 10cm slope length. The results were summarized as follows: 1. Average soil temperatures at 10cm and 20cm depth in vinyl mulching plots were $1.6^{\circ}C$ and $1.1^{\circ}C$ higher than those of control, respectively. However, the average soil temperatures in rice straw mulching plots were relatively lower than those of control during the growing season. 2. The greatest diurnal fluctuation of soil temperature was found at the vinyl mulching plots and it was decreased with increasing soil depth. 3. The calculated thermal diffusivities were 0.011, 0.009 and $0.007cm^2/sec$ for the vinyl mulching, control and straw mulching, respectively. 4. Soil losses were 103kg/10a for the vinyl mulching and 36kg/10a for the straw mulching which were nearly negligible as compared to the control. 5. Soil physical properties such as bulk density, hardness and water content were significantly improved by the vinyl and straw mulchings.

  • PDF

GIS spatial D/B formation of geothermal data and Distribution of Heat Flow of Korea (한국의 지열자료 GIS 공간 D/B 구축과 지열류량 분포)

  • Kim, Hyoung-Chan;Lee, Young-Min;Park, Jeong-Min
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 2006.06a
    • /
    • pp.459-460
    • /
    • 2006
  • 현재 남한의 지열류량 측정값으로는 총 363개 지점의 자료가 측정 및 수집되어 있다. 이것은 Mizutani et at. (1970), 장정진 외(1970), 그리고 서정희(1976) 등의 자료, 총 35개의 자료도 추가된 것이다. 1989년 이후부터 측정된 지열류량 자료는 217개 자료이며(임정웅 외, 1989; 임정웅 외, 1996; Lim and Kim, 1997; 염병우 외, 1997), 모두 직접 측정한 것이나, 1989년 이후 보고된 지열류량 자료에 약간의 오류가 있어 이번 연구에서 수정 보완하였다. 또한 과거의 자료 35개 자료는 이미 지열류량 측정치가 논문화 되어 있는 것으로 암석시료는 없다 1989년 이후 2004년까지 자료 217개 2005년도 추가 자료 111개의 지열류량 자료는 암석시료도 있으며, 측정기기가 서로 달라 오차가 있을 수 있어 서로 보정을 해야 할 필요가 있어 시추공 주변 암석을 새로 수집해서 신장비로 다시 측정 보정하였다. 지열류량 D/B 구축은 각 자료의 일련번호, 고유번호 (Sn.), 위경도 좌표 (longitude, lattitude), 암석의 열전도도(thermal conductivity), 지온경사 (thermal gradient), 지열류량 (heat flow)등으로 구성되어 있다. 지열류량 자료 공간 데이터베이스는 점 속성을 가지며 자료형태는 각종 소프트웨어와 호환성이 좋은 shape 파일 형태로 작성하였다. 또만 최근 천부 토양 및 암석 열물성을 이용한 냉난방시스템 즉, Heat Pump System 설계를 위하여 반드시 들어가야 하는 요소인 열확산율, 공극율, 밀도, 비열 등 열물성 특성을 추가하여 GIS 공간 D/B구축하였다. 대륙붕 자료 4개 자료를 제외하고 359개의 지열류량 자료를 이용하여 한반도 남부, 즉 남한의 지열류량 분포도를 작성 분석해 본 결과(그림 1), 우리나라의 지열류량 이상대는 아산만 주변, 보령, 유성, 진안, 울진, 포항, 부산 지역과 포천, 속초, 충주, 수안보 등 지역에서 나타난다 이러한 이상대 주변에는 대개 온천이 발달되어 있었거나 새로 개발되어 있는 곳이다. 온천에 이용하고 있는 시추공의 자료는 배제하였으나 온천이응으로 직접적으로 영향을 받지 않은 시추공의 자료는 사용하였다 이러한 온천 주변 지역이라 하더라도 실제는 온천의 pumping 으로 인한 대류현상으로 주변 일대의 온도를 올려놓았기 때문에 비교적 높은 지열류량 값을 보인다. 한편 한반도 남동부 일대는 이번 추가된 자료에 의해 새로운 지열류량 분포 변화가 나타났다 강원 북부 오색온천지역 부근에서 높은 지열류량 분포를 보이며 또한 우리나라 대단층 중의 하나인 양산단층과 같은 방향으로 발달한 밀양단층, 모량단층, 동래단층 등 주변부로 NNE-SSW 방향의 지열류량 이상대가 발달한다. 이것으로 볼 때 지열류량은 지질구조와 무관하지 않음을 파악할 수 있다. 특히 이러한 단층대 주변은 지열수의 순환이 깊은 심도까지 가능하므로 이러한 대류현상으로 지표부근까지 높은 지온 전달이 되어 나타나는 것으로 판단된다.

  • PDF

Geothermal Research and Development in Korea (한국의 지열 연구와 개발)

  • Song, Yoon-Ho;Kim, Hyoung-Chan;Lee, Sang-Kyu
    • Economic and Environmental Geology
    • /
    • v.39 no.4 s.179
    • /
    • pp.485-494
    • /
    • 2006
  • This paper summarizes the history of geothermal research in Korea since 1920s and also describes the present status of research on heat flow, origin of thermal waters and geothermal exploitation and utilization. Geothermal research in Korea has been mainly related with hot spring investigation until 1970s. 1t was not until 1980s before heat flow study became continuous by research institute and academia and first nation-scale geothermal gradient map and heat flow map were published in 1996. Also in 1990s, geochemical isotope analysis of Korean hot spring waters and measurements of heat production rate of some granite bodies were made. Attempts to develop and utilize the deep geothermal water has been tried from early 1990s but field scale exploitations for geothermal water was activated in 2000s. Considering recent increase of demands on both deep and shallow geothermal energy utilization, outlook on future goethermal research and development is encouraging.

Growth Characteristics of Dendropanax morbifera $\textrm{L}_{EV}$ in Wando Area of Korea (완도군 황칠나무의 생육특성)

  • 최성규
    • KOREAN JOURNAL OF CROP SCIENCE
    • /
    • v.48 no.6
    • /
    • pp.434-437
    • /
    • 2003
  • This study was carried out to obtain basic information for environment of native area and growth characteristics under various mulching materials in Dendropanox morbifera $\textrm{L}_{EV}$, Dendropax c morbifera was grown wild at Wando area, particularly, distribution frequency was high at 20 to 280 meters above the sea level, and configuration of the ground of native area descended slowly toward the southeast. The soil characteristics of native area was pH 5.3-5.5, 8.8-9.5% in organic matter content and 19.8-22.0% in soil moisture. Growth of Dendropanox morbifera $\textrm{L}_{EV}$, was accelerated by transparent polyethylene film and black polyethylene film mulched.

Habitat Environment of Epimedium koreanum Nakai (삼지구엽초(三枝九葉草) 자생지(生地生) 환경(環境) 특성(特性))

  • Park, Kyeong-Yeol;Choi, Byoung-Ryourl;Yi, Eun-Sub;Kim, Sun-Jae;Park, Cheol-Ho
    • Korean Journal of Medicinal Crop Science
    • /
    • v.6 no.1
    • /
    • pp.51-56
    • /
    • 1998
  • This study was carried out to evaluate environmental and ecological characteristics of natural habitat for cultivation of Epimedium koreanum. Habitat of E. koreanum was the slope foot of mountain descending gradually toward mostly northwest from top of mountain with slope of $2{\sim}20%$ and the altitude ranged from 60 to 400m above the sea level. Some physiochemical characteristics of habitat soil were as follows: pH, $4.1{\sim}5.8$, organic matters content, $4.9{\sim}6.6%$ and cation exchange capacity, $14.8{\sim}34.3\;me/100g$ soil, respectively. Habitats were shaded by deciduous broad-leaved tree mainly, and compared with those of naked area, relative photon flux density was $3.5{\sim}13.1%$ and relative luminance was $3.3{\sim}11.9%$ due to shading. Air temperature of habitat under shade was $4.3{\sim}6.5^{\circ}C$ lower than that of naked area. Habitat soil temperature was lower than that of naked area but temperature range was smaller than that of naked area. E. koreanum plants were growing with semishading plants under shade of tree leaf. From investigation of natural characteristics of habitat, it was concluded that E. koreanum plant would grow at place with a little change in temperature and moisture of soil which was caused by shading and mulching with litterfall of broad-leaved tree.

  • PDF