• Title/Summary/Keyword: 지하수모델링

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Characterization of Groundwater Flow to Horizontal or Slanted Well Using Numerical Modeling (수치 모사를 활용한 수평 혹은 경사형 특수 정호 지하수 흐름 특성 평가)

  • Kim, Hyoung-Soo
    • Journal of Soil and Groundwater Environment
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    • v.13 no.2
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    • pp.54-61
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    • 2008
  • The drawdown distribution due to pumping by horizontal or slanted wells is analyzed by numerical modelling. In the numerical modelling uses 1-D discrete element feature included in commercial groundwater modeling program FEFLOW (version 5.1) and the results are compared with the semi analytic solution which uses superposition of successive point sources proposed by Zhan and Zlotnik (2002). Results of the numerical modeling agree well with the semi analytic solution except for very near field region of sink sources. The drawdown distribution due to pumping in riverbank filtration(RBF) plan site can be evaluated quantitatively by the numerical modeling in this study.

Electrical Resistivity Survey at the Ground with Micro-subsidence by Excessive Pumping of Groundwater (지하수 과잉양수에 따른 미세 지반변형 지역에서의 전기비저항 탐사)

  • Song Sung-Ho;Lee Kyu-Sang;Yong Hwan-Ho;Kim Jin-Ho
    • Geophysics and Geophysical Exploration
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    • v.7 no.3
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    • pp.197-206
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    • 2004
  • Because the minute displacement of ground accompanied by excessive pumping of groundwater at specified site is mainly generated from ill-balancing of water budget within groundwater basin, It is necessary to monitor the variation of micro-subsidence for a long time at representative points. We made up the conceptual model using two-dimensional electrical resistivity survey and three-dimensional soil profile consisted of loam and sand. In verifying the reliability of this conceptual model using numerical modeling for ground settlement and groundwater flowing, two-dimensional electrical resistivity survey with short distance of electrode following soil sampling with hand auger would be useful for interpreting hydrogeological structure related to the minute displacement of ground consisted of loam and sand.

삼광광산 주변에 분포한 열극대가 지하수 유동체계에 미치는 영향 분석

  • 김계남;김천수;김길정;강일식
    • Proceedings of the Korean Nuclear Society Conference
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    • 1996.05c
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    • pp.577-582
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    • 1996
  • 지하수 유동체계 해석 모델인 2차원의 TRAFRAP 모델과 3차원의 MODFLOW모델을 사용하여 삼광광산 주변일대를 모델링하였다. 그 결과 암반내의 평균 지하수 유동속도는 1m/년 총 지하수 유출량은 640㎥/일로 분석되었다. 또한 열극대를 고려하여 유동체계를 해석하면, 열극대 주변에서는 물이 빠르게 유동하므로 수두값이 작아지고 지하수 유동로는 평균 100 m 정도 깊은 곳에 형성됨을 알 수 있다.

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Sequential Gaussian Simulation(SGS)에 의한 질산성질소 오염 분포 영상화

  • 배광옥;이강근;정형재
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2003.04a
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    • pp.82-85
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    • 2003
  • 강원도 춘천시 신북읍 유포리 연구지역의 지하수의 NO$_3$-N 2차원 공간 분포를 정의하기 위하여 지구통계학적 해석 방법인 sequential Gaussian simulation(SGS)을 이용하였다. 원자료의 공간적 clustering을 제거하기 위하여 cell declustering을 수행한 후 normal score 변환을 거친 후 variogram 분석과 모델링을 수행하였다. Exponential, gaussian, spherical variogram model에 대한 각각의 nugget, range, sill을 정의하여 SGS에 이용하였다. SGS에 의해 도출된 결과들은 모두 동일한 결과를 나타낸다. 또한 관측 자료의 분포와 주 오염원의 분포와 상응하는 모델링 결과를 나타내는 것으로 보아 SGS를 이용한 농촌지역 지하수내 NO$_3$-N의 공간적 오염 분포 영상화가 매우 유용하게 활용될 수 있을 것으로 판단된다.

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Analysis of Effect of Railway Tunnel Excavation on Water Levels of a National Groundwater Monitoring Station in Mokpo, Korea (철도 터널 굴착이 목포용당 국가 지하수 관측소 지하수위에 미친 영향 분석)

  • Lee Jin-Yong;Yi Myeong-Jae;Choi Mi-Jung;Hwang Hyoun-Tae;Moon Sang-Ho;Won Jong-Ho
    • Tunnel and Underground Space
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    • v.16 no.1 s.60
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    • pp.73-84
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    • 2006
  • Effects of railway tunnel excavation on water level at a national groundwater monitoring station in Mokpo were evaluated by field investigation and numerical groundwater modeling. The water level at the station has experienced a decline of about 5 m within 1 year since July 2002. From the field investigation, it was concluded that decrease of precipitation oo increase of grundwater use was not reason for the decline. The Mokpo tunnel of new Honam railway, 70 m apart from the national station, appeared most plausible cause and a period of the tunnel excavation generally well matches up that of the drawdown. To quantify the effects of the tunneling on the water level, a groundwater flow modeling was performed. Especially, a most probable conceptual model was optimized through multiple preliminary simulations of various scenarios because there were few hydrogeological data available for the study area. The optimized model was finally used for the quantification. Based on the field investigation and the numerical simulations, it was concluded that the tunnel excavation was one of the most probable reasons for the substantial water level decline but further hydrogeologic investigation and continuous monitoring are essentially required for the surrounding area.

Three-Dimensional Numerical Simulation of Impacts of Fault Existence on Groundwater Flow and Salt Transport in a Coastal Aquifer, Buan, Korea (한국 부안 지역 해안 대수층 내의 지하수 유동 및 염분 이동에 대한 단층 존재의 영향 삼차원 수치 모의)

  • Park, Ju-Hyun;Kihm, Jung-Hwi;Kim, Han-Tae;Kim, Jun-Mo
    • Journal of Soil and Groundwater Environment
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    • v.13 no.5
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    • pp.33-46
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    • 2008
  • A series of three-dimensional numerical simulations using a generalized multidimensional hydrodynamic dispersion numerical model is performed to simulate effectively and to evaluate quantitatively impacts of fault existence on densitydependent groundwater flow and salt transport in coastal aquifer systems. A series of steady-state numerical simulations with calibration is performed first for an actual coastal aquifer system which contains a major fault. A series of steadystate numerical simulations is then performed for a corresponding coastal aquifer system which does not have such a major fault. Finally, the results of both numerical simulations are compared with each other and analyzed. The results of the numerical simulations show that the major fault produces hydrogeologically significant heterogeneity and true anisotropy in the actual coastal aquifer system, and density-dependent groundwater flow, salt transport, and seawater intrusion patterns in the coastal aquifer systems are intensively and extensively dependent upon the existence or absence of such a major fault. Especially, the major fault may act as a pathway for groundwater flow and salt transport along the direction parallel to its plane, while it may also behave as a barrier against groundwater flow and salt transport along the direction perpendicular to its plane.

Groundwater recharge rate using HGS modelling at the facility agricultural complex in the vicinity of Miryang River (HGS 모델링을 통한 밀양강 주변 시설농업단지의 지하수 함양량 추정)

  • Kang, Dong-hwan;So, Yoon Hwan;Yoon, Yeon Su
    • Proceedings of the Korea Water Resources Association Conference
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    • 2018.05a
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    • pp.275-275
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    • 2018
  • 본 연구의 목적은 지표수-지하수 통합 모델을 통해 모델 영역과 시설농업단지(밀양들)의 지표수/지하수 유동을 모의하고 모델 영역의 물수지 분석을 통해 지하수 함양량을 산정하는 것이다. 지표수 유동 모델 결과에서는 밀양강 상류(북동쪽)에서 하류(남동쪽)로 약 1~5 m의 수심으로 지표수가 유동하고 있으며, 모델지역 상류의 M01 지점에서는 지표수 유량 관측값과 모델값이 일치하고, 모델지역 하류의 M02 지점에서의 지표수 유량은 1% 정도의 차이를 보인다. 지하수 유동 모델에서는 지하수 심도가 하천에서는 표고와 유사하며 산림 지역으로 갈수록 높아지고, 지하수 양수를 고려한 지하수 심도는 모델값이 관측값보다 1.5 m 이내의 범위로 높게 나타난다. 지표수지하수 통합모델에서는 지하수의 함양 면적이 모델 면적의 90% 정도이고, 지하수 함양량은 $1.92{\times}105m^3/day$인 것으로 나타난다. 연평균 물수지 분석에서는 단위 면적당 지하수 함양량이 503.9 mm/year로서 연평균 강우량의 39% 정도로 추정된다.

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Estimation of streamflow depletion due to groundwater pumping using analytical and numerical models (해석적 모형과 수치적 모형을 이용한 지하수 양수로 인한 하천수 감소량 산정)

  • Lee, Jeongwoo;Chung, Il-Moon;Kim, Nam Won;Hong, Sung Hun
    • Proceedings of the Korea Water Resources Association Conference
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    • 2018.05a
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    • pp.294-294
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    • 2018
  • 복잡한 수문 수리지질학적 조건을 고려할 수 있는 SWAT-MODFLOW 지표수-지하수 통합모형과 대수층-하천-양수정 시스템을 단순화한 Hunt (1999) 해석해를 죽산천 인근 지역에 각각 적용하여 지하수 양수로 인한 하천수 감소량을 모의하고 그 결과를 비교하였다. 하천으로부터 약 1 km 이내에 위치한 천부 지하수 관정들 중에서 취수계획량이 $100m^3$/일을 초과하는 18개의 관정을 선별하고 지하수 양수량 대비 하천수 감소량(하천수 감소비)을 산정한 결과 대부분의 관정에서 해석해와 모델링 결과의 차이가 0.2 미만으로 매우 작은 것으로 나타났다. 따라서 해석해가 하천-대수층 시스템을 단순화한 조건에 대해 유도되었음에도 불구하고 정밀한 모델링에 준하는 결과를 나타낼 수 있는 것으로 분석되었다. 그러나, 양수기간이 장기화되거나 하천과 관정간의 이격거리가 증가함에 따라 해석해와 모의결과의 차이가 다소 증가하는 경향을 나타내었다. 해석해가 대수층 저류량의 감소와 하천수량의 감소가 장기적으로 균형을 이루는 동적 평형 상태를 구현할 수 없고 하천수위의 급격한 변화에 따른 하천수와 지하수간의 상호 교환량의 불규칙한 패턴 또한 모사할 수 없는 한계가 있지만 양수기간 5년 이내의 하천수 감소량의 평균적인 거동은 수치모의 결과와 유사한 것으로 평가되었다.

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Numerical simulation of groundwater flow in LILW Repository site:I. Groundwater flow modeling (중.저준위 방사성폐기물 처분 부지의 지하수 유동에 대한 수치 모사: 1. 지하수 유동 모델링)

  • Park, Kyung-Woo;Ji, Sung-Hoon;Kim, Chun-Soo;Kim, Kyung-Su;Kim, Ji-Yeon
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.6 no.4
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    • pp.265-282
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    • 2008
  • Based on the site characterization works in a low and intermediate level waste(LILW) repository site, the numerical simulations for groundwater flow were carried out in order to understand the groundwater flow system of repository site. To accomplish the groundwater flow modeling in the repository site, the discrete fracture network(DFN) model was constructed using the characteristics of fracture zones and background fractures. At result, the total 10 different hydraulic conductivity(K) fields were obtained from DFN model stochastically and K distributions of constructed mesh were inputted into the 10 cases of groundwater flow simulations in FEFLOW. From the total 10 numerical simulation results, the simulated groundwater levels were strongly governed by topography and the groundwater fluxes were governed by locally existed high permeable fracture zones in repository depth. Especially, the groundwater table was predicted to have several tens meters below the groundwater table compared with the undisturbed condition around disposal silo after construction of underground facilities. After closure of disposal facilities, the groundwater level would be almost recovered within 1 year and have a tendency to keep a steady state of groundwater level in 2 year.

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Groundwater Flow Modeling in a Riverbank Filtration Area, Deasan-Myeon, Changwon City (창원시 대산면 강변여과수 취수부지 주변의 지하수 유동 모델링)

  • Hamm, Se-Yeong;Cheong, Jae-Yeol;Kim, Hyoung-Su;Hahn, Jeong-Sang;Cha, Yong-Hoon
    • Economic and Environmental Geology
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    • v.38 no.1
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    • pp.67-78
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    • 2005
  • Riverbank filtration has been used in advanced countries for 150 years. In Korea, investigations for producing riverbank filtrate started in the Han River, Nakdong River, Geum River, Yeongsan River and Seomjin River basins in the 1990s. The lower part of the Nakdong River has a poorer water quality than the upper part of the river. A water balance analysis and groundwater flow modeling were conducted for the riverbanks of the Nakdong River in Daesan-Myeon, Changwon City. The results of the water balance analysis revealed the groundwater infiltration rate into the aquifer to be 245.26 mm/year (19.68% of the average annual precipitation, 1,251.32 mm). Direct runoff accounts for 153.49 mm/year, evapotranspiration is 723.95 mm/year and baseflow is 127.63 mm/year. According to the groundwater flow modeling, 65% of the total inflow to the pumping wells originates from the Nakdong River, 13% originates from the aquifer in the rectilinear direction, and 22% originates from the aquifer in the parallel direction. The particle tracking model shows that a particle moving from the river toward the pumping wells travels 100 m in 50 days and a particle from the aquifer toward the pumping wells travels 100 m in 100 days.