• 지구물리와물리탐사
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• 제10권3호
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• pp.211-218
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• 2007

본 연구는 2003년부터 2004년에 걸쳐 대한광업진흥공사에서 수행한 지하수기초조사의 사업지역인 경남 밀양 및 경기 포천의 지역별 충적층 두께 분포 특성을 파악하기 위하여 전기비저항 수직탐사(슐럼버져 배열)에 의해 획득된 충적층 심도 자료에 대하여 지구통계학적 기법인 정규크리깅을 적용하였다. 물리탐사 자료의 적용성 검증을 위하여 물리탐사 자료와 시추공 자료의 상관성분석을 실시하였다. 정규크리깅에 의해 충적층 분포를 이미지화한 결과, 지형이나 유역에 따라 충적층 심도분포가 합리적으로 묘사된 것으로 나타났으며, 따라서, 충적층 심도 분포 파악에 있어서 전기비저항 수직 탐사 자료에 의해서도 만족할만한 수준의 결과를 얻는 것이 가능한 것으로 판단된다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 추계 학술발표회
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• pp.1296-1305
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• 2008

In this study, the spatial distribution of depth between alluvial soil and weathered soil of Song-do new city is analyzed using geostatistics. From analysis results, the boundary depth of north-east region is deeper than that of south-west region, and average depth of north-east region is 27.14m and average depth of south-west region is 23.25m. The boundary depth is estimated by ordinary kriging and inverse distance method, and estimated results are almost similarity. So, in Song-do new city, these two method can be used to estimate the boundary depth. The ordinary kriging method is a very useful tool because the more exact analysis of spatial continuity and distribution characteristic is possible.

• 한국지역지리학회지
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• 제14권2호
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• pp.173-188
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• 2008

본 보고서는 도시개발에 따른 지형변화를 비교 분석하기 위하여, 팔공산지 등단의 산록에 위치한 대구 혁신도시 개발예정지의 지형자원의 분포를 조사한 것이다. 조사 결과를 요약하면 다음과 같다. 첫째, 배후산지의 소규모 하곡 전면에는 소규모 선상지들이 분포하며, 하곡 측면에는 배후의 산지로부터 이어지는 구릉지가 분포한다. 둘째, 소규모 하곡이 구릉지를 측방침식 한 경우에는 수직의 하식애와 평탄한 기반암 하상이 잘 드러나며, 셰일 하상에는 건열과 연흔 화석이 나타나기도 한다. 일부 하곡에서는 절리를 따라 암괴가 제거되어 감입곡류가 형성되는 과정을 보여주기도 한다. 셋째, 신서지구의 선상지는 약 7m의 층후를 보인다. 선상지를 관류하는 신서천 하곡 내에는 2m 내외의 하안단구가 형성되어 있다. 이 하안단구는 후빙기 선상지가 개석되는 과정에서 형성된 것으로, 하안단구 형성과정의 새로운 가능성을 제시해 준다.

• 지구물리와물리탐사
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• 제16권3호
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• pp.154-162
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• 2013

지하수 인공함양 지역에 충적층 특성 평가를 위한 목적으로 수직탐사와 2차원 전기비저항탐사를 수행하였다. 지하수 인공함양의 주 대상 지층인 충적층 내에 존재하는 세립자들은 지하수와 함께 이동하여 클로깅 현상을 일으킬 수 있으므로 주의를 요하는데, 전기비저항탐사를 통해서 저비저항을 보이는 포화된 실트 또는 점토의 분포를 파악하는 것이 매우 효과적이다. 반면에, 이러한 저비저항대가 두터운 경우는 지층에서 인위적으로 보내진 전기가 저비저항대의 층으로만 통하여 그 이하의 지층 또한 저비저항대로 왜곡되는 단점을 가지므로 해석 시에 주의가 요구된다. 본 연구는 이러한 영향을 고려하여 격자형태의 35개의 수직탐사 측점과 10개의 2차원탐사 측선을 따라서 탐사를 수행하여 각각의 장점인 수직적인 분해능과 수평적인 분해능을 비교 및 보완하였다. 수직탐사를 통해 지하 30 m 이후에 약 15 m 두께로 인공함양의 주대상 지층인 모래자갈층이 퇴적되어 있을 것으로 사료되며 두 탐사의 비교를 통해 연구지 지하 일부 구간에 클로깅 현상을 유발할 수 있는 실트 또는 점토의 분포가 예상되었다. 이러한 결과는 지하수 인공함양을 위한 주입정 및 관측정의 위치와 심도를 설계하는데 있어 충적층의 퇴적양상 파악에 대한 전기비저항탐사의 적용성을 보여준다.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2004년도 임시총회 및 추계학술발표회
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• pp.121-121
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• 2004

The groundwater in the Pocheon area occurs from both a fractured bedrock aquifer in igneous and metamorphic rocks and an alluvial aquifer with a thickness of <50 m, and forms a major source of domestic and agricultural water supply. In this study, we performed a hydrogeochemical study in order to identify the control of geochemical processes on groundwater quality. For this study, groundwater level and physicochemical parameters (EC, Eh, pH, alkalinity) were monitored once a month from a total of 150 groundwater wells between June 2003 to August 2004. A total of 153 water samples (13 surface water, 66 alluvial groundwater, 74 bedrock groundwater) were also collected and analyzed in February 2004. Groundwater chemistry in the study area is very complex, depending on a number of major factors such as geology, degree of chemical weathering, and quality of recharge water. Hydrochemical reactions such as the leaching of surficial and near-solace soil salts, dissolution of calcite, cation exchange, and weathering of silicate minerals are proposed to explain the chemistry of natural groundwater. Alluvial groundwaters locally have very high TDS concentrations, which are characterized by their chloride(nitrate)-sulfate-bicabonate facies and low Na/Cl ratio. Their grondwater levels are highly fluctuated according to rainfall event. We suggest that high nitrate content and salinity in such alluvial groundwaters originates from the local recharge of sewage effluents and/or fertilizers. Likewise, high concentrations of nitrate were also locally observed in some bedrock groundwaters, suggesting their effect of anthropogenic contamination. This is possibly due to the bypass flow taking place through macropores. Tile degree of the weathering of silicate minerals seems to be a major control of the distribution of major cations (sodium, calcium, magnesium, potassium) in bedrock groundwaters, which show a general increase with increasing depth of wells. Thermodynamic interpretation of groundwater chemistry shows that the groundwater in the study area is in chemical equilibrium with kaolinite and Na-montmorillonite, which indicates that weathering of plagioclase to those minerals is a major control of hydrochemistry of bedrock groundwater. The interpretation of the molar ratios among major ions, as well as the mass balance calculation, also indicates the role of both dissolution/precipitation of calcite and Ca-Na cationic exchange as bedrock groundwaters evolves progressively.

• 한국농공학회논문집
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• 제59권5호
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• pp.25-30
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• 2017

Hydrologic soil group is one of the important factors to determine runoff potential and curve number. This study was conducted to classify the hydrologic soil groups of Korean soils by considering saturated hydraulic conductivity and depth of impermeable layer. Saturated hydraulic conductivity of Korean soils was estimated by pedotransfer functions developed in the previous studies. Most of paddy soils were classified as D type due to shallow impermeable layer and low saturated hydraulic conductivity in B soil horizon. For upland and forest, soils classified to A and D types increased compared with former classification method because underestimated permeabilities and overestimated drainages were corrected and rock horizon in shallow depth was regarded as impermeable layer. Soils in mountainous land showed the highest distribution in A type, followed by D type. More than 60 % of soils in mountain foot-slope, fan and valley, alluvial plains, and fluvio-marine deposits were classified to D type because of land use such as paddy and upland.

• 한국농공학회지
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• 제30권2호
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• pp.55-66
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• 1988

This study was conducted to investigate the various engineering properties and correlationshops among the soil constants of alluvial clayey deposits distributed in the bay of Asan and their results are summarized as follows : 1. Grain size distribution of soil was consisted of 12 % of clay, 46-73 % of silt, 2-23 % of sand, and as for the consistency characteristics, 26-36 % of liquid limit, 18-21 % of plastic limit and 6-16 % of plastic index, and so the soil belonging to as a lower plastic nonorganic clay, it's specific gravity was 2,66-2.70, and the location on the plastic chart was approximately above the A-line. Z The natural moisture content and unit weight were 30-43 % and 1.76-1.87 g I cm$_3$, respectively, and according to increment of natural moisture content, the unit weight was decreased, and the initial void ratio and degree of saturation were shown of 0,87-1119 and 92- 100 %, most of saturated. 3. Cone resistance value which was shown 2.4 - 6.5 kg / $cm^2$ was a little lower and it was increased with the depth of layer and shown the formular $q_c=0.7_z+1.32$. 4. Unconfined compression strength was about 0.18-0.43kg /$cm^2$, cu, 0.1-0.22kg / $\psi$, $2-6^{\circ}$ under uu-test condition of triaxial, and CCU, 0.08-0.3 kg/cm , $\psi$, $12-18^{\circ}$ under the condition of cu-test. 5. Pre-consolidation load of characteristics of consolidation was 0.4-0.8 kg / $cm^2$, compression index, about 0.17-0.33. 6. Liquid limit and plastic index were incresased with the increment of clay content but most of alluvial clay was appeared as a normal through non-activity clay soil shown more natural moisture content than liquid limit, and their relationship as follows : LL=0.38( cy+54.8), PI=0.836(LL -17.8), PI =0.468(LL -0.48) 7. The initial void ratio presented correlationship of positive among clay content, natural moisture content and liquid limit, and that of reverse with unit weight, and their results as follws : $e_o=0.024(w_n+0.2)$, $e_o=e_o=0.0003c_y+0.0005 LL+0.0151 W_n+\frac{3.58}{r-t}-1.52$ 8. It was shown that the compression index has correlationship of postive among the clay content, liquid limit, plastic index, natural moisture content and initial void ratio, and their relationships as follows ; $c_c=0.44(e_o-0.47)$, $c_c=0.001$

• 한국지역지리학회지
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• 제9권2호
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• pp.203-216
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• 2003

본 논문은 경남 사천만을 중심으로 위성영상과 GIS 기법을 이용하여 수치지형도와 수치해도를 결합한 수치고도 모델(DEM) 제작을 통해 육지와 천해를 연계한 해양지형의 분석을 시도한 것이다. 수치고도모델의 제작은 육지 고도 및 해저 수심 레이어 추출 UTM 재투영, 좌표점의 이동과 보간 등의 과정을 거쳐 이루어 졌다. 조류이동, 천해퇴적, 수심 등 해저지형 분석은 Landsat TM 밴드 육안분석, 육지부 마스킹, 밴드합성, 회귀분석 등을 통해 이루어 졌으며 천해 실측자료는 오차를 수정하여 분석에 이용되었다. 수치고도모델에서 분석된 지형요소들은 하천, 선상지, 조류, 단구, 해적퇴적층 등이다. 연안 퇴적작용은 하천 운반물의 영향을 크게 받고 있는데, 특히 진양호의 배수로인 가화천은 계절작으로 여름철에 공급량이 많으며 조류의 영향이 적은 곳에 퇴적층이 잘 발달하였다. 단구지형이 발달한 만안쪽에는 조류퇴적물의 영향이 크고, 소규모 만입은 해안류에 의한 운반물오 폐쇄되는 특성을 보인다. 사천만 동안의 선상지 지형은 해저까지 연장되어 발달하고 있다. 진주만 뱅크는 잔류 구릉이 침수된 것으로 미립물의 해저 퇴적지 역할을 하고 있다.

• 자원환경지질
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• 제16권1호
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• pp.11-18
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• 1983

Gyeongsang Basin in the southeastern part of the Korean peninsular is characterized by many fault systems. To decipher the geotectonical evolution of the Korean peninsular and marginal basins in her adjacent areas it is prerequisite to understand the spatial distribution pattern and mutual relationships of these fault systems. Because of difficulties in finding any criterion to recognize the faults in field, their extension and mutual relationships in ages are not very clear yet. As an attempt to find geophysical criteria to recognize the fault, geoelectrical resistivity survey was carried out in this study. With the Wenner configuration four resistivity soundings and twenty seven resistivity profilings were done. The electrode distance used was up to 50m. From the results of the resistivity soundings and boring data of earlier groundwater investigations the depth of alluvial and weathered zone was established to be at most 20m in the study area. In the resistivity profiling low resistivity anomaly zones are detected on every traverse, which are interpreted as caused by fractures, fault clays and mylonites in the fault zone. The width of the fault zone amounts to 0.3-1km. By correlating and connecting the negative anomaly zones from traverse to traverse one can determine the trend of th of the faultzone and therefore that of fault itself. The recognized fault trend in this way was $N15^{\circ}-20^{\circ}E$ and this coincides with the direction of the inferred fault line from earlier geological surface mapping. With the help of this characteristical negative anomaly the existance of another $N80^{\circ}W$ trending fault was estabished. This study has shown that geoelectrical resistivity survey can be applied successfully to the problem of tracing fault line insofar as a fault zone has been developed along fault line.

• 한국토양비료학회지
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• 제46권6호
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• pp.409-416
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• 2013

Millet and sorghum are major dryland cereal crops, however their growth and productivity is limited by soil water stress with varying intensity. The major objective of this study was to evaluate water stress of millet and sorghum yield under drainage classes of poorly drained soil and to test the effect of the installed pipe drainage in poorly drained paddy soil to minimize crop stress. The research was carried out in poorly drained paddy fields located at alluvial slopping area resulting in non-uniform water content distribution by the inflow of ground water from the upper part of the field. Stress Day Index (SDI) was determined from a stress day factor (SD) and a crop susceptibility factor (CS). SD is a degree of measurement by calculating the daily sum of excess water in the profile above 30cm soil depth ($SEW_{30}$). CS depends on a given excess water on crop stage. The results showed that sum of excess water day ($SWD_{30}$) used to represent the moisture stress index was lower on somewhat poorly drained soil compared with poorly drained soil on 117 days. CS values for sorghum were 57% on $3^{rd}$ leaf stage, 44% on $5^{th}$ leaf stage, 37% on panicle initiation, 23% on boot stage, and 16% on soft dough stage. For proso millet CS values were 84% on $3^{rd}$ leaf stage, 70% on $5^{th}$ leaf Stage, 65% on panicle initiation, 53% on boot stage, and 28% on soft dough stage. And for foxtail millet the values were 73% on $3^{rd}$ leaf stage, 61% on $5^{th}$ leaf stage, 50% on panicle initiation, 29% on boot stage, and 15% on soft dough stage. SDI of sorghum and millet was more susceptible to excess soil water during panicle initation stage more poorly drained soil than somewhat poorly drained soil. Grain yield was reduced especially in proso millet and Foxtail millet compared to Sorghum.