Effects of spatial variability of fracture width and leakage conditions on the migration of DNAPLs in network fractures

Xing CHANG; Qiankun LUO; Yaping DENG; Lei MA; Jiazhong QIAN

doi:10.16030/j.cnki.issn.1000-3665.202103055

Shuiwen dizhi gongcheng dizhi (May 2022)

Effects of spatial variability of fracture width and leakage conditions on the migration of DNAPLs in network fractures

Xing CHANG,
Qiankun LUO,
Yaping DENG,
Lei MA,
Jiazhong QIAN

Affiliations

Xing CHANG: School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui　230009, China
Qiankun LUO: School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui　230009, China
Yaping DENG: School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui　230009, China
Lei MA: School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui　230009, China
Jiazhong QIAN: School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui　230009, China

DOI: https://doi.org/10.16030/j.cnki.issn.1000-3665.202103055
Journal volume & issue: Vol. 49, no. 3
pp. 174 – 181

Abstract

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The migration and distribution of dense non-aqueous phase liquid (DNAPLs) in fractured media are affected by many factors, including the chemical properties of DNAPLs, geometric and chemical properties of fractures and leakage conditions. Previous studies were mostly conducted in a single fracture, while the migration of DNAPLs in stochastic network fracture were seldom examined. In this paper, stochastic network fractures are generated using the Monte Carlo method. The coordinates and apertures of fractures are identified and output by pixel scanning. The migration of Perchloroethylene (PCE) in the stochastic network fractures is simulated by PetraSim. The effects of the geometric properties of the fractures and the leakage conditions (including the leakage rate and the leakage location) on the migration of DNAPLs are discussed. The numerical simulation results show that the spatial variability of fractures also affects the migration path and spatial distribution of DNAPLs. With the increase of spatial variability of fracture width in the network fractures, dominant channels appear, the migration rate of DNAPLs accelerates, and the location of DNAPLs centroid and the spatial distribution of saturation change significantly. The leakage rate affects the migration range and spatial distribution of DNAPLs. The higher the leakage rate is, the faster the migration rate of DNAPLs will be. The more saturated the accumulated DNAPLs at the bottom of the model, the greater the spatial distribution of DNAPLs is. In the same network fracture, different leakage locations will also lead to different migration paths and distribution ranges of DNAPLs. The spatial variability of fractures in the gravity direction at different leakage locations is different, leading to different migration paths and spatial distribution of DNAPLs.

Published in Shuiwen dizhi gongcheng dizhi

ISSN: 1000-3665 (Print)
Publisher: Editorial Office of Hydrogeology & Engineering Geology
Country of publisher: China
LCC subjects: Science: Geology
Website: https://www.swdzgcdz.com/indexen.htm

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