水科学进展
水科學進展
수과학진전
Advances in Water Science
2015年
5期
722-730
,共9页
邓亚平%张烨%施小清%吴吉春
鄧亞平%張燁%施小清%吳吉春
산아평%장엽%시소청%오길춘
非均质%裂隙介质%地质统计%DNAPLs%T2VOC
非均質%裂隙介質%地質統計%DNAPLs%T2VOC
비균질%렬극개질%지질통계%DNAPLs%T2VOC
heterogeneity%fractured media%geostatistics%Dense Non-Aqueous Phase Liquids%T2VOC
由于裂隙介质具有强烈非均质性, 使得重非水相流体( DNAPLs)在裂隙介质中的运移行为较孔隙介质更为复杂. 基于指示模拟算法模拟裂隙介质的二元变量(粗糙面接触和裂隙开口), 综合模拟退火算法构建裂隙渗透率随机场. 采用T2VOC模拟DNAPLs在裂隙介质的运移, 探讨粗糙面接触的相关长度、 各向异性比、 倾角以及非均质性程度对DNAPLs运移分布的影响. 数值分析结果表明, 粗糙面接触的相关性越差, DNAPLs污染范围越大; 粗糙面接触的各向异性比和倾角增大, 将导致更多DNAPLs残留; 而相关长度和各向异性比增大以及倾角减小, 都会引起DNAPLs锋面运移速率增大; 随着渗透率非均质性增强, 会导致局部粗糙面接触上蓄积的DNAPLs饱和度增大,运移速率减小.
由于裂隙介質具有彊烈非均質性, 使得重非水相流體( DNAPLs)在裂隙介質中的運移行為較孔隙介質更為複雜. 基于指示模擬算法模擬裂隙介質的二元變量(粗糙麵接觸和裂隙開口), 綜閤模擬退火算法構建裂隙滲透率隨機場. 採用T2VOC模擬DNAPLs在裂隙介質的運移, 探討粗糙麵接觸的相關長度、 各嚮異性比、 傾角以及非均質性程度對DNAPLs運移分佈的影響. 數值分析結果錶明, 粗糙麵接觸的相關性越差, DNAPLs汙染範圍越大; 粗糙麵接觸的各嚮異性比和傾角增大, 將導緻更多DNAPLs殘留; 而相關長度和各嚮異性比增大以及傾角減小, 都會引起DNAPLs鋒麵運移速率增大; 隨著滲透率非均質性增彊, 會導緻跼部粗糙麵接觸上蓄積的DNAPLs飽和度增大,運移速率減小.
유우렬극개질구유강렬비균질성, 사득중비수상류체( DNAPLs)재렬극개질중적운이행위교공극개질경위복잡. 기우지시모의산법모의렬극개질적이원변량(조조면접촉화렬극개구), 종합모의퇴화산법구건렬극삼투솔수궤장. 채용T2VOC모의DNAPLs재렬극개질적운이, 탐토조조면접촉적상관장도、 각향이성비、 경각이급비균질성정도대DNAPLs운이분포적영향. 수치분석결과표명, 조조면접촉적상관성월차, DNAPLs오염범위월대; 조조면접촉적각향이성비화경각증대, 장도치경다DNAPLs잔류; 이상관장도화각향이성비증대이급경각감소, 도회인기DNAPLs봉면운이속솔증대; 수착삼투솔비균질성증강, 회도치국부조조면접촉상축적적DNAPLs포화도증대,운이속솔감소.
Due to the strong heterogeneity of fractured media, the migration behavior of Dense Non-Aqueous Phase Liquids ( hereafter referred to as DNAPLs) in fractured media is more complicated than in pore media. Binary varia-bles of fractured media are initially simulated using the indicator simulation and finally modified with simulated annea-ling algorithm to generate the stochastic permeability fields ( SPF) . By simulating the migration of DNAPLs in frac-tured media with the T2VOC, we can study the effects of correlation length, anisotropy ratio, inclination of asperity contacts and degree of heterogeneity on the migration and distribution of DNAPLs. Numerical analysis results suggest that a worse correlation among adjacent asperity contacts leads to a larger pollution scope of DNAPLs;a larger anisot-ropy ratio and inclination lead to more residual DNAPLs;with increasing correlation length and anisotropy ratio as well as decreasing inclination, the front surface migration rate of DNAPLs increases; and the increasing heterogeneity of permeability causes an increasing saturation of DNAPLs accumulated in local asperity contacts, and a decreasing mi-gration rate.