• Journal of the Korean Association of Geographic Information Studies
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• v.7 no.2
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• pp.47-56
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• 2004

The purpose of this study is to estimate soil loss amount according to the rainfall-runoff erosivity factor frequency and to analyze the hazard zone that has high possibilities of soil erosion in the watershed. RUSLE was used to analyze soil loss quantity. The study area is Gwanchon that is part of Seomjin river basin. To obtain the frequency rainfall-runoff erosivity factor, the daily maximum rainfall data for 39 years was used. The probability rainfall was calculated by using the Normal distribution, Log-normal distribution, Pearson type III distribution, Log-Pearson type III distribution and Extreme-I distribution. Log-Pearson type III was considered to be the most accurate of all, and used to estimate 24 hours probabilistic rainfall, and the rainfall-runoff erosivity factor by frequency was estimated by adapting the Huff distribution ratio. As a result of estimating soil erosion quantity, the average soil quantity shows 12.8 and $68.0ton/ha{\cdot}yr$, respectively from 2 years to 200 years frequency. The distribution of soil loss quantity within a watershed was classified into 4 classes, and the hazard zone that has high possibilities of soil erosion was analyzed on the basis of these 4 classes. The hazard zone represents class IV. The land use area of class IV shows $0.01-5.28km^2$, it ranges 0.02-9.06% of total farming area. Especially, in the case of a frequency of 200 years, the field area occupies 77.1% of total fanning area. Accordingly, it is considered that soil loss can be influenced by land cover and cultivation practices.

• Korean Journal of Soil Science and Fertilizer
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• v.19 no.4
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• pp.275-282
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• 1986

A series of studies on the properties of clayey terrace soils distributed at the inland (Yeongcheon) and coastal (Yeongjil) regions in Yeongnam district was carried out. On the base of the facts found and already reported about the macro morphological features as well as on pedological characters in micro scale, physicochemical properties, mineralogical characteristics etc., the present study dealt with soil genesis and tried to classify the soils for reasonable use and managements. 1. Although the both regions belonged to "Mesic" soil temperature regime and "red and yellow earths" areas of "Thornthwaite" pedo-climatic diagram, climatic indices as a soil forming factor indicate that the coastal Yeongil had milder than the inland Yeongcheon. 2. All the terrace soils had developed soil profiles with an "Argrllic B". Upyeong soils in Yeongil region had "Argillans" even in the "II B horizons" that possibly be "Paleo-argillic". 3. The bisequum profiles of Bancheon in Yeongcheon and Upyeong in Yeongil revealed that they were developed on Late Mesozoic shale and on semiconsolidated Tertiary deposits respectively, therefore the overlying clayey terrace deposits were assumed to be originated from the Early Quaternary deposits, Diluvium. 4. To supplement the Soil Taxonomy of USDA, the terrace soils with different degrees of gleyzation were classified as follows; Deogpyeong and Hwadong soils which have less than 50cm of paddified gley horizons (redness less than 0.5) in the upper part of the profiles by artificial surface irrigation, tentatively classified into "Anthrepiaquic Hapludalfs" and the Geugrag soils that have more than 50cm of paddified gley horizons within 1.2m of the profiles, into "Anthr-aquic Ochraqualfs" while the Upyeong soils that had greyish mottles in subsoils by natural ground water remain as an "Aquic Hapludalfs" the same as present. The Bancheon soils with free mottles are into "Typic Hapludalfs" as used at present.

• Proceedings of the KGS Conference
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• 2004.05a
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• pp.38-38
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• 2004

효율적 인 국토환경 관리와 지속 가능한 생태자원의 보존을 위해서는 지형 및 토양의 공간적인 분포특성과 그것이 각종 자연 및 인문현상들과 가지는 상관성에 대한 파악이 선행되어야 한다 기존의 지형분류법은 대부분 지형형성과정 혹은 지형의 형태의 분류에 치중하여, 그 결과가 지표면에서 나타나는 생태학적 현상들과의 관련성을 파악하기 어려운 단점이 있다. (중략)

• Korean Journal of Soil Science and Fertilizer
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• v.17 no.4
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• pp.343-348
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• 1984

Variation of soil properties within mapping unit of lava plain soils was statistically summarized. Properties such as particle size distribution, moisture retention, color, pH, and CEC are relatively unaffected by soil management while Na, K, base saturation, and available $P_2O_5$ most affected by management. These soils were correctly classified with regard to order at 66.5, to greatgroup at 56.0, and to series at 43.8%. CV values greater than 90% could be symptomatic of skew distribution. Distributions of sand content and some chemical properties were log-normal.

• Journal of Soil and Groundwater Environment
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• v.25 no.3
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• pp.32-42
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• 2020

오염부지 관리 기조가 매체 중심에서 수용체 중심으로 변화하면서 우리나라에 위해성평가 제도가 도입되었으나, 이를 오염현장에 충분히 활용하기 위한 체계와 관련 기술들은 아직 제대로 확립되어 있지 않다. 특히, 여러 가지 이유로 정화곤란부지로 분류가 되는 오염부지의 정화 및 관리와 그러한 부지에 적용될 수 있는 위해저감기술들에 대한 기술적, 사회적 논의와 합의도 부족한 실정이다. 본 연구에서는 그동안 오염토양의 정화에만 초점이 맞추어진 우리나라의 토양환경정책이 오염부지의 관점에서 그와 연결된 수용체를 보호하는 방향으로 나아가기 위해 필요한 위해성기반 오염 부지관리 의사결정체계를 제안하고, 그러한 관리체계가 현장에서 적절히 적용되도록 하기 위해 필요한 위해저감기술들을 조사, 분류하여 위해저감 방식에 따른 위해저감기술의 활용성 및 적용성을 평가하는 방안을 제안하였다.

• Journal of Korea Soil Environment Society
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• v.3 no.2
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• pp.3-12
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• 1998

To analyze of oils in contaminated soils, it is necessary to classify of oils accurately and it has to be selected suitable extraction method and instrumental analysis method in according to the character of sample. In this study, oils are classified into three groups-gasoline, diesel and kerosene-we consider extraction methods and quantitative analysis method of these oils using GC/MS. As the analysis example of real sample, we analyze some gasolines and diesels of some oil refining company and calculate BTEX in gasoline and saturated n-hydrocarbons in diesel. And also, we study the representative quantitative method of each kind of oils.

• Journal of the Korean Institute of Landscape Architecture
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• v.24 no.4
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• pp.74-84
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• 1997

최근. 급격한 도시화 현상으로 인한 불투성 지표의 증가는 도시의 생태적 측면에 변화를 일으키고 있으며, 도시의 온난화 현상. 도시의 사막화 현상 등이 그 결과로 나타나고 있다. 특히, 분투수성 지표가 많은 도시에서는 그 수문학적 기능이 투수성 지표에 의존하고 있으며, 도시의 투수성 지표에는 오픈 스페이스와 주변의 생산녹지 등이 있다 이러한 관점에서 투수성 지표에 관한 연구가 필요함에도 불구하고 많지 않았고, 대부분 포인트별 연구였다. 본 연구는 도시 내의 수문기능 환경변화개선에 관한 기초자료로 동경의 대표적 도시공원인 코카네이 (소금정) 공원과 동경 근교의 치바현 (천엽현)위치한 치바(천엽)대학 부속 카시와 (상) 농장을 대상지로 선정 토양환경기능의 간접적 지표가 되는 토양경도를 나카야마식(산중식) 토양경도 계륵 사용하여 5120 Cm의 라인위에 10 Cm간격으로 512개씩 코카네이(소금정) 공원에서 9라인. 카시와(상) 농장에서 7라인을 공간별로 측정하고. 그 측정값을 다중비교검정과 Bartlett's 검정에 의하여 검정후에, 랜덤 데이타분석에 적합한 FFT(Fast Fourier Transform)를 사용하여 분석하였다 본 연구의 측정값을 다중비교검정과 Bartlett's 검정한 결과, 유의타가 없었고, 각 데이터를 분석한 결과. 공원의 9라인과 농장의 7라인은 분석 그래프의 유형에 의해 각각 2가지로 분류되었고, 전체적으로는 3가지로 분류할 수 있었다 특히 공원과 농장의 분석 그래프에서는 수평 방향으로의 변화에 대한 수직방향의 변화가 비슷한 스펙트럼이 공통적으로 나타났고. 각각 최대 값은 다르나 제1주기 부분에서는 답압과 같은 인위적인 요인에 의한 논은 수직방향의 스펙트럼 변화가 관찰되었다. 또한, 강우가 녹지의 경도변화에 미치는 가를 관찰하기 위하여 강우전과 강우후에 같은 라인(Line1과 Line2)을 측정하여 분석한 결과, 측정값의 평균에서는 차이를 보였으나. 주기의 변화는 거의 없었다. 전체적으로 분석 그래프에서는 공간별로 스펙트럼의 수평방향에 대한 수직방향의 변화량의 차이는 보였으나 비슷한 주기를 나타냈고, 가작의 유형은 공원의 녹지공간(lawn-area)과 나지공간(bare-area)으로, 농장을 녹지공간(lawn-area)과 경작공간(field-area)으로 분류할 수있었다. 종합적으로 녹지를 지질학적 구조의 고유한 특징이 아닌. 답압 등과 같은 인위적인 요인에 따른 속성들에 의하여 나타나는 스펙트럼의 분석을 통하여 녹지공간(lawn-area). 나지공간(bare-area)그리고, 경작공간(field-area)으로 분류할 수 있었다..

• Korean Journal of Soil Science and Fertilizer
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• v.21 no.3
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• pp.339-345
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• 1988

Four actinomycetes which produces extracellular chitinase were isolated from soil and organic matter all over the Chonnam provincial area. The chemical composition, morphological, cultural and physiological properties of isolated strain S-25, S-42, S-172 and S-267 were studied in relation to the toxonomical properties. All of strains contained phospholipids such as phosphatidyl ethanolamine, phosphatidyl inositol and diphosphatidyl glycerol. The components of cell wall in all strains have L, L-DAP, Glutamic acid, Alanine, Glycine and Glucosamine. The surface of spore is smooth and colony is grey in all strains, Based on the results obtained in these experiments all of strains are identified as Streptomyces sp.S-25, Streptomyces sp.S-42, Streptomyces sp.S-l72 and Streptomyces sp. S-267.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.31 no.2B
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• pp.155-163
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• 2011

In this study, a soil moisture estimation model was developed using a decision tree model, an artificial neural networks (ANN) model, remotely sensed data, and ground network data of daily precipitation, soil moisture and surface temperature. Soil moisture data of the Yongdam dam basin (5 sites) were used for model validation. Satellite remote sensing data and geographical data and meteorological data were used in the classification and regression tree (CART) model for data classification and the ANNs model was applied for clustered data to estimate soil moisture. Soil moisture data of Jucheon, Bugui, Sangjeon, Ahncheon sites were used for training and the correlation coefficient between soil moisture estimates and observations was between 0.92 to 0.96, root mean square error was between 1.00 to 1.88%, and mean absolute error was between 0.75 to 1.45%. Cheoncheon2 site was used for validation. Test statistics showed that the correlation coefficient, the root mean square error, the mean absolute error were 0.91, 3.19%, and 2.72% respectively. Results demonstrated that the developed soil moisture model using CART and ANN was able to apply for the estimation of soil moisture distribution.

• Korean Journal of Soil Science and Fertilizer
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• v.18 no.3
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• pp.254-259
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• 1985

Variability of soil characteristics and purity were statistically summarized within mapping units and estimates were given for sample sizes required to reach predetermined levels of accuracy in mountain-foot slope soils. Total variances within mapped soil series (expressed as CV): 12-44% for pH, CEC, and particle size distribution was relatively unaffected and 56-196% for OM, ext.-cations, and available $P_2O_5$, affected by management. Means of some chemical properties were estimated on the assumption of lognormal distribution. These soils were correctly classified with regard to order at 52.2%, to great group 53.7%, and to series 39.7%. respectively. Approximate sample sizes required to detect the difference of 10 and 20% of the true mean with 0.95 confidence level were presented.