• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.236-236
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• 2011

진천지역의 지하수 유동체계를 분석하기 위해 진천지역 내 530개 공의 지하수위를 1년간 관측하였다. 이중 360개 공에서는 분기별로 한번씩 총 4회, 130개 공에서는 월1회씩 총 12회 지하수위를 관측하였으며, 40개 공에 대해서는 1시간 간격으로 자동관측을 실시하였다. 관측결과를 수집하여 지하수위의 변동특성, 지하수위 분포, 지하수 심도분포 등을 실시하였으며, 이와 같은 지하수위 분석 결과를 바탕으로 지하수 유동체계를 분석하였다. 조사지역의 평수기 지하수위 분포에 대해 수리학적인 접근법(hydraulic approach) 및 동수역학적 접근법(hydrodynamic approach)에 근거하여 수리수두(hydraulic head) 및 전수두(total head)를 분석하여 2차원 및 3차원 수리경사도를 작성하였다. 이러한 지하수위 분포에 따른 분석 성과와 지형 및 수문지질을 고려하여 함양 및 배출지역을 분류하였으며, 이와 함께 기분석된 지하수위 등고선에 따른 유선망도를 작성하였다. 지하수는 지하수위의 표고 및 압력에 따른 위치 에너지 차에 의하여 대수층 매질을 통하여 유동하며 수두가 높은 곳에서 낮은 곳으로 일정한 수리경사를 갖고 지하수 등수위선에 연직 방향으로 형성된 유선을 따라 이동한다. 따라서 지하수의 유동방향은 지하수 수리경사 분석이 이루어진 8개 방향의 지하수위 경사 중 최대경사를 갖는 방향으로 지하수 유동이 발생하므로, 이를 지하수위 유동방향으로 결정하였다. 이와 같이 분류된 지하수 함양 중간 및 배출 지역과 지하수의 함양과 배출의 양적인 측면에 서 유동체계의 규모를 고려하여 조사 지역을 8단계로 구분하였다. 또한 조사지역의 지하수 유동체계를 종합적으로 규명하기 위하여 기 분석한 조사지역의 지하수위 등고선, 지하수위 등심도선, 지하수 수리경사, 지하수 유동방향 및 지하수 함양-배출체계와 지형기복, 그리고 주요 하천 등의 제반 요소를 중첩 분석하여 종합적으로 규명하고, 그 결과를 지하수 유동체계도로 작성하였다. 지하수 유동체계 분석결과는 수문지질 평가와 오염취약성 평가 및 지하수 관리 방안 수립에 활용될 수 있을 것으로 기대된다.

• The Journal of Engineering Geology
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• v.9 no.2
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• pp.147-159
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• 1999

Geostatistical methods were used for the groundwater flow analysis in a heterogeneous anisotropic aquifer. This study area is located at Sonbul-myeon in Hampyong-gun of Cheonnam Province which is a hydrogeological project area of KORES(Korea Resources Cooperation). Linear regression analysis shows that the topographic elevation and groundwater level of this area have very high correlation. Groundwater-level contour maps produced by ordinary kriging and cokringing have large differences in mountain areas, but small differences in hill and plain areas near the West Sea. Comparing two maps on the basis of an elevation contour map, a groundwater-level contour map using cokriging is more accurate. Analyzing the groundwater flow on two groundwater-level contour maps, the groundwater of study area flows from the high mountain areas to the plain areas near the West Sea. To verify the enffectiveness of geostatistical methods for the groundwater flow analysis in a heterogeneous anisotropic aquifer, the flow directions of groundwater were measured at two groundwater boreholes by a groundwater flowmeter system(model 200 $GeoFlo^{R}$). The measured flow directions of groundwater almost accord with those estimated on two groundwater-level contour maps produced by geostatistical methods.

• Economic and Environmental Geology
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• v.22 no.4
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• pp.381-393
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• 1989

Hydrogeological modelling was performed to evaluate groundwater flow system in Igsan Area. The study area extends over $790km^2$. The geology consists of Jurassic Daebo granite and gneissose granite and Precambrian metamorphic rocks. The capability of pumping yield is the highest in gneissose granite region among them due to comparatively thick weathered zone with thickness ranging from 10m to 25m. The Colorado State University Finite Difference Model was used for the model simulation. The model was divided into 28 rows and 31 columns with variable grid spacing. The model was calibrated under steady-state and unsteady-state conditions. In the steady-state simulation, the model results were compared with measured water table contours in September 1985 with determining hydraulic conductivities and net recharge rates during rainy season. Unsteady state simulation was done to know the aquifer response due to groundwater abstraction. The non- steady state calibration was conducted to determine the distribution and magnitudes of specific yields and discharge/recharge rates during dry season as matching water level altitudes in May 1986. The calibrated model was used to simulate water level vaiation caused by groundwater withdrawal and natural recharge from 1 October, 1985 until 30 September, 1995. The calibrated model can be used to groundwater development schemes on regional groundwater levels, but it cannot be used to simulate local groundwater level change at a specific site.

• Journal of the Korean Association of Geographic Information Studies
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• v.5 no.1
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• pp.38-47
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• 2002

This paper demonstrates a regional analysis of landslide occurrence potential by applying geographic information system to the Kumi City selected as a pilot study area. The estimate criteria related to natural and humane environmental factors which affect landslides were first established. A slope map and a aspect map were extracted from DEM, which was generated from the contour layers of digital topographic maps, and a NDVI vegetation map and a land cover map were obtained through satellite image processing. After the spatial database was constructed, indexes of landslide occurrence potential were computed and then a few landslide-potential areas were extracted by an overlay method. It was ascertained that there are high landslide-potential at areas of about 30% incline, aspects including either south or east at least, adjacent to water areas or pointed end of the water system, in or near fault zones, covered with medium vegetable. For more synthetic and accurate analysis, soil data, forest data, underground water level data, meteorological data and so on should be added to the spatial database.