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The effects of hydrogeological and chemical aquifer heterogeneities on the field-scale transport of a sorbing solute are investigated by two-dimensional numerical solutions of steady-state flow and transient advection-dispersion equations. The presence of heterogeneities in the aquifer is modeled with the use of a geostatistical description of the hydraulic conductivity (K) and distribution coefficient (Kd). These parameters were grouped into (1) K heterogeneity only; (2) Kd heterogeneity only; and (3) combined heterogeneity of K and Kd. Impacts of combined K-Kd fields were represented by evaluating point statistics values of the concentration obtained at monitoring wells and area of contamination from 100 Monte-Carlo trials. The inclusion of sorption notably delays the transport of solute at a given monitoring location. Consideration of both K and Kd heterogeneities results in a larger variance in contaminated area as compared to the systems of K heterogeneity only. Results from varous scenarios with different K-Kd correlations show that correlation relationship could enhance or reduce the relative impacts of K and Kd heterogeneities on contaminant transport. Larger variation is obtained for independently-correlated fields and larger mean for negatively-correlated fields. These outcomes indicate that correlation between K and Kd values significantly impact the transport of a sorptive contaminant in heterogeneous aquifers.
정상 상태 유동 및 천이 이류-분산 방정식의 이차원 수치해를 이용하여 대수층의 수리지질학적, 화학적 불균질성이 흡착성 용질의 현장 규모 이동에 미치는 영향을 조사하였다. 수리전도도(K)와 분배계수(Kd)를 지구통계학적으로 묘사함으로써 대수층 매체 내에 존재하는 불균질성을 모델링하였다. 대수층 인자들은 (1) K만 불균질인 경우, (2) Kd만 불균질인 경우, (3) K와 Kd가 동시에 불균질인 경우로 나누어 고려하였다. 100회에 걸쳐 수행된 Monte-Carlo 시뮬레이션의 결과치에서 얻은 점기반 통계치들을 이용하여 K-Kd장이 미치는 영향을 평가하였다. 흡착을 고려함에 따라 특정 감시지점에서 오염물 이동이 분명하게 지연되었다. K만이 불균질인 경우와 비교할 때 K-Kd장의 불균질성을 고려할 경우 오염 영역의 변동성이 증가하였다. K-Kd장의 상관관계를 변화시키면서 얻은 계산 결과에 따르면 연관 관계가 K-Kd장의 불균질성이 오염물 이동에 미치는 영향을 증대 또는 감소시킬 수 있음을 보여 주었다. 독립 연관 관계일 때 변동도가 컸고 음의 상관관계일 때 평균이 컸다. 이러한 결과는 K와 Kd간 상관관계가 불균질 대수층 내 흡창성 오염물의 이동에 큰 영향을 미침을 나타낸다.
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- Publisher :The Korean Society of Mineral and Energy Resources Engineers
- Publisher(Ko) :한국자원공학회
- Journal Title :Journal of the Korean Society for Geosystem Engineering
- Journal Title(Ko) :한국지구시스템공학회지
- Volume : 44
- No :3
- Pages :228-234
Journal of the Korean Society of Mineral and Energy Resources Engineers
