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천정용 한국환경기술인연합회 2001 환경기술인 Vol.174 No.-
(1) 토양오염의 특성과 현황 - 토양오염은 지하에서 일어나는 오염문제이므로 눈으로 직접 확인하기가 어려울 뿐만 아니라 한번 오염되면 복원을 위해서 많은 시간과 경제적 노력이 필요함 - 우리나라에서는 폐광지대 그리고 공업단지 내 유류 저장시설 주변 토양이 중금속과 유기화합물로 심각하게 오염되어 있는 것으로 나타남 (2) 오염토양 정화기술의 분류와 주요기술 - 오염토양 정화기술은 크게 비원위치 기술과 원위치 기술로 분류되며 각각 물리적, 화학적, 생물학적
불균질한 다공성 매질에서의 지하수위 변동을 고려한 저밀도 비수용성유체(LNAPL)의 흐름 모의
천정용 ( Jeong Yong Cheon ),이진용 ( Jin Yong Lee ),이강근 ( Kang Kun Lee ) 대한지질공학회 2003 지질공학 Vol.13 No.1
불포화대에서 저밀도 비수용성유체의 이동과 분포를 모의하기 위하여 STOMP(Subsurface Transport over Multiple Phase) 시뮬레이터를 이용하였다. 균질한 매질에서의 저밀도 비수용성유체의 이동은 조립질 매질에서 빠르고, 세립질 매질에서는 불포화대에 더 많이 잔류한다. 조립질 매질 내에 세립질층이 존재할 경우, 이 층이 지하수면으로부터 멀수록 저밀도 비수용성유체가 불포화대에 더 많이 잔류된다. 조립질 매질에 세립질 또는 더 조립질인 매질이 렌즈 상으로 존재하는 경우에는 저밀도 비수용성유체가 이들 렌즈를 통과하지 못한다. 불균질한 렌즈가 존재할 때의 저밀도 비수용성유체의 분포를 초기조건으로, 지하수면의 변동에 따른 저밀도 비수용성유체의 이동을 모의하였다. 지하수위의 변동에 따라 불포화대에 잔류되어 있던 저밀도 비수용성유체의 수직방향 이동이 증가되었다. 특히, 지하수면의 하강 시 저밀도 비수용성유체가 조립질 렌즈를 통해 이동하나, 세립질 렌즈를 통해서는 이동하지 못한다. 일련의 수치실험의 결과로부터 유류 등의 저밀도 비수용성유체의 오염분포는 매질의 불균질성 그리고 지하수위 변동과 같은 수리지질학특성에 의해 크게 영향을 받을 수 있음을 알 수 있다. A series of numerical simulations were carried out using STOMP(Subsurface Transport over Multiple Phase) simulator. The flow and distribution of LNAPL were analyzed in homogeneous fine and coarse sand. Vertical movement of LNAPL is faster in the coarser sand. But the total volume of LNAPL retained in the unsaturated zone is larger in the finer sand. A fine layer in the coarse sand domain is also simulated. The results showed that the retained LNAPL volume and shape are highly influenced by the position of the fine layer. Flow and distributions of LNAPL were simulated when there were heterogeneous lenses in the sand domain. Water table fluctuation was also considered. In these cases, it was found that the heterogeneous lens was a barrier to LNAPL flow, and water table fluctuation stimulated the downward movement of retained LNAPL. The LNAPL flow and distribution observed in these numerical experiments show that in the subsurface environment, the behaviors of LNAPL highly depend on heterogeneities of unsaturated zone and the dynamic hydrogeologic condition such as water table fluctuation. These results can explain some of the complexity of LNAPL flow and distribution patterns in LNAPL contaminated field sites.
하이브리드 Funnel and Gate 지하수 흐름제어를 통한 반응벽체 설치 연구
김태영,천정용,이명재,차용훈,신선호,장명도,김정우 한국지하수토양환경학회 2023 지하수토양환경 Vol.28 No.3
Permeable reactive barrier (PRB) is a prominent in-situ remedial option for cleanup of contaminated groundwater and hasbeen gaining increasing popularity in recent years. Funnel-and-gate systems, comprised of two side wings of impermeablewalls and a central gate wall, are frequently implemented in many sites, but often suffers from bypassing of groundwaterdue to the progressive clogging of the gate wall over extended period of time. This study investigated technical feasibilityof a hybrid funnel-and-gate system designed to address the flow deterioration in the gate wall. The key attribute of theproposed hybrid system is the operation of drainage units at the barrier walls and rear end of the gate wall. A conceptualmodeling with MODFLOW indicated the groundwater inside the barrier was maintained at appropriate level to be guidedtoward the gate wall, yielding constant discharging of groundwater from the gate.
Combined performance of pumping and tracer tests: A case study
이진용,김정우,천정용,이명재,이강근 한국지질과학협의회 2003 Geosciences Journal Vol.7 No.3
A combined pumping and tracer test was conductedat a highly fractured aquifer system. The hydrogeologic unitsunderlying the test site are reclamation soil, weathered rock layer,and fractured layer. The fractured layer is the main aquifer forthis site. Prior to pumping and tracer tests, slug tests were con-ducted at four test wells. The test data revealed existence of a lowpermeability zone near wel OB-1. Generally the estimated hydraulicconductivities are in the order of 10-4 cm/sec. A pumping test witha discharge rate of 57 m3/d was performed for 1,230 min. Thepumping test data analysis yielded coherent hydraulic conductiv-ity values with those of the slug tests. However, the separate analysisfor each monitoring wel based on conventional analytical solutionswith highly strict boundary conditions and homogeneity assump-tion cannot efficiently show the potential existence of the low per-meability zone. During the pumping test, when the water levels ofthe pumping and monitoring wells are stabilized, a convergent radialtracer test was conducted. From the observed tracer concentration,a longitudinal dispersivity of 0.3 m was obtained, which is wel con-sistent with the values in the prominent literature considering thetest scale. This study excellently demonstrated a method complet-ing a combined pumping and tracer test at one time. A combined pumping and tracer test was conducted at a highly fractured aquifer system. The hydrogeologic units underlying the test site are reclamation soil, weathered rock layer, and fractured layer. The fractured layer is the main aquifer for this site. Prior to pumping and tracer tests, slug tests were conducted at four test wells. The test data revealed existence of a low permeability zone near well OB-1. Generally the estimated hydraulic conductivities are in the order of 10-4 cm/sec. A pumping test with a discharge rate of 57 m3/d was performed for 1,230 min. The pumping test data analysis yielded coherent hydraulic conductivity values with those of the slug tests. However, the separate analysis for each monitoring well based on conventional analytical solutions with highly strict boundary conditions and homogeneity assumption cannot efficiently show the potential existence of the low permeability zone. During the pumping test, when the water levels of the pumping and monitoring wells are stabilized, a convergent radial tracer test was conducted. From the observed tracer concentration, a longitudinal dispersivity of 0.3 m was obtained, which is well consistent with the values in the prominent literature considering the test scale. This study excellently demonstrated a method completing a combined pumping and tracer test at one time.