Article
Environmental Sciences
Michelle M. Lorah, Eric Vogler, Fredrick E. Gebhardt, Duane Graves, Jennifer Fedorowski Grabowski
Summary: The potential neurotoxic and carcinogenic effects of RDX on human health require groundwater remediation strategies. This study investigates the feasibility of bioremediation by biostimulation and bioaugmentation to achieve anaerobic degradation of RDX, perchlorate, and nitrate. The results show that bioaugmentation is effective in degrading RDX, nitrate, and perchlorate, while biostimulation alone is less efficient.
Article
Engineering, Environmental
Guowen Dong, Ruiwen Han, Yajing Pan, Chengkai Zhang, Yu Liu, Honghui Wang, Xiaoliang Ji, Randy A. Dahlgren, Xu Shang, Zheng Chen, Minghua Zhang
Summary: This study found that adding MnO2 particles under intermittent illumination significantly promoted the mobility of Fe and As in arsenic-enriched soils, with higher dosage demonstrating greater effects. MnO2 amendments not only altered the soil microbial community structure, but also enhanced the reduction of Fe/As.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Environmental
Taehoon Kim, Weon Shik Han, Seonkyoo Yoon, Jehyun Shin, Myung Jin Nam, Peter K. Kang
Summary: A 3D high-resolution subsurface characteristic (HSC) numerical model was developed to assess the migration and distribution of subsurface DNAPLs. The model integrated diverse field data and considered the hydrogeologic characteristics of both porous and fractured rock media. By simulating a hypothetical 100-year DNAPLs contamination and quantitatively analyzing its spatiotemporal distributions, the study highlighted the significant role of WR characteristics in DNAPLs migration.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Geochemistry & Geophysics
Richard Metcalfe, Antoni E. Milodowski, Lorraine P. Field, Roy A. Wogelius, Grainne Carpenter, Bruce W. D. Yardley, Simon Norris
Summary: Fractured Crystalline Rocks are being considered for radioactive waste repositories, with diffusion through open fractures and rock matrices affecting the movement of radionuclides. The importance of Rock Matrix Diffusion (RMD) varies in different types of FCR, highlighting the need for site-specific information to determine the reliance on RMD for safety cases.
APPLIED GEOCHEMISTRY
(2021)
Article
Engineering, Geological
Kejing Chen, Qinghui Jiang
Summary: This paper proposes a method to calculate the compliance matrix of fractured rocks using field data. The method is based on the Oda fracture tensor, which combines the mechanical properties of intact rocks and the geometric and mechanical properties of the fractures. The compliance matrix-based anisotropy index EAI is derived to evaluate the anisotropy of the fractured rock mass. The study also investigates the influence of confining pressure on the normal and shear stiffness of the fracture.
ENGINEERING GEOLOGY
(2023)
Article
Engineering, Geological
Lenka Rukavickova, Jan Holecek, Pavla Holeckova, Jan Najser, Libor Gvozdik, Tomas Paces
Summary: Field measurements of hydraulic properties in Czech granitoids show different hydraulic conductivity in fractured rock and rock matrix, with mean values ranging from 10-8 to 10-7 m/s and 10-11 to 10-12 m/s respectively. Differences between laboratory and field values are mainly caused by scale effect, which is influenced by the connectivity of microfissure network.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Energy & Fuels
Amin Taghavinejad, Mohammad Sharifi
Summary: The study utilizes statistical distribution concept to model the properties of naturally fractured reservoirs, showing that different matrix properties distributions have varying effects on pressure transient analysis plots. Lower values dominate the pressure behavior in cases of matrix block size and porosity distributions, while higher values dominate in case of matrix permeability distribution.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Christian Zangerl, Matthias Koppensteiner, Thomas Strauhal
Summary: This study presents a semi-automatic workflow for determining basic discontinuity parameters of fractured rock masses. It aims to promote the use of widely accepted statistical evaluation methods in fields such as engineering geology and rock mechanics. The workflow is tested on data from a study site in granodioritic rock, and all scripts used are provided for easier implementation.
APPLIED SCIENCES-BASEL
(2022)
Article
Green & Sustainable Science & Technology
Minyoung Kim, Hye-Bin Kim, Sungyup Jung, Jong-Min Jung, Kun-Yi Andrew Lin, Joerg Rinklebe, Kitae Baek, Eilhann E. Kwon
Summary: This study examined the potential of Antarctic krill as a biodiesel feedstock and the application of krill biochar, a solid residue obtained after biodiesel production, as an adsorbent for toxic chemicals. The results showed that Antarctic krill has potential for biodiesel production and krill biochar has good adsorption capacity for toxic chemicals.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Environmental Sciences
Jianwei Huang, Shanjun Liu, Wenfang Liu, Chunju Zhang, Shuiping Li, Min Yu, Lixin Wu
Summary: Different types of fracturing modes exhibit different trends in thermal infrared (TIR) radiance variation. Experimental observations show that extensional fissures lead to increased radiance with a local peak in the 8.0-9.7 µm range, while local bulging results in decreased radiance with a local valley in the same range. These changes in radiance are influenced by both temperature and emissivity variations, with the characteristic waveband relating to quartz emissivity changes.
Review
Geochemistry & Geophysics
H. S. Viswanathan, J. Ajo-Franklin, J. T. Birkholzer, J. W. Carey, Y. Guglielmi, J. D. Hyman, S. Karra, L. J. Pyrak-Nolte, H. Rajaram, G. Srinivasan, D. M. Tartakovsky
Summary: Quantitative prediction of phenomena in fractured rock is a major challenge in Earth and Energy Sciences. Recent advances in research have improved understanding and prediction of flow and transport in fractured systems, with applications in various fields.
REVIEWS OF GEOPHYSICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Liangtong Zhan, Yingtao Hu, Liangchao Zou, Wenjie Xu, Zuyang Ye, Ruiqi Chen, Duanyang Zhuang, Jinlong Li, Yunmin Chen
Summary: This study numerically analyzed the impact of multiscale heterogeneity on the flow and transport response of a three-dimensional fractured porous rock with rough-walled fracture network. Results showed that multiscale heterogeneity led to highly variable velocity and concentration distributions among different discrete fracture matrix models.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Chemistry, Multidisciplinary
Luat Khoa Tran, Stephan Konrad Matthai
Summary: This study focuses on rainwater infiltration into fractured rock and examines the impact of fracture-matrix transfer (FMT) on infiltration depth. It was found that FMT has a significant influence on the infiltration rate within a specific fracture aperture range, and variations in fracture aperture can enhance finger-like infiltration. Additionally, the interaction between fracture flow and FMT is complex.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Geological
Silvia De Simone, Caroline Darcel, Hossein A. Kasani, Diego Mas Ivars, Philippe Davy
Summary: A quantitative and analytical approach is used to estimate the equivalent Biot effective stress coefficient (alpha) over bar and Skempton pore pressure coefficient (B) over bar for hydro-mechanical analysis of fractured rock mass. Formal expressions are derived to estimate these poroelastic coefficients using the properties of both intact rock and discrete fracture network. The coefficients are highly anisotropic and vary with fracture orientations and properties.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Geochemistry & Geophysics
Jing Ba, Wei Zhang, Guangtan Huang, Tobias M. M. Mueller, Cong Luo
Summary: This study investigates the influence of fracture parameters on seismic reflection response through modeling the impact of vertical fractures on reflection pattern. The method is applied to real seismic reflection data, and the predicted fracture strike is found to be consistent with the estimation based on well-bore imaging data.
PURE AND APPLIED GEOPHYSICS
(2023)
Article
Geosciences, Multidisciplinary
Claire R. Tiedeman, Allen M. Shapiro, Paul A. Hsieh, Thomas E. Imbrigiotta, Daniel J. Goode, Pierre J. Lacombe, Mary F. DeFlaun, Scott R. Drew, Carole D. Johnson, John H. Williams, Gary P. Curtis
Article
Geosciences, Multidisciplinary
Allen M. Shapiro, Claire R. Tiedeman, Thomas E. Imbrigiotta, Daniel J. Goode, Paul A. Hsieh, Pierre J. Lacombe, Mary F. DeFlaun, Scott R. Drew, Gary P. Curtis
Article
Environmental Sciences
Allen M. Shapiro, Daniel J. Goode, Thomas E. Imbrigiotta, Michelle M. Lorah, Claire R. Tiedeman
JOURNAL OF CONTAMINANT HYDROLOGY
(2019)
Article
Environmental Sciences
Allen M. Shapiro, Frederick D. Day-Lewis
Summary: Rapid infiltration following precipitation can lead to groundwater contamination, requiring real-time monitoring of meteorological and groundwater levels to estimate recharge. A physics-based model is proposed to estimate recharge, utilizing real-time data for water-table altitude, precipitation, and evapotranspiration. Model results indicate that the frequency of observations affects the allocation between preferential and diffuse flow.
WATER RESOURCES RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Claire R. Tiedeman, Allen M. Shapiro
Summary: Particle tracking is used to determine contributing areas (CAs) to wells in a small synthetic watershed with dipping sedimentary rocks. The CAs are strike-oriented bands where the water table intersects high-hydraulic conductivity beds. Factors such as topographic flow directions, rock dip direction, fracture density, and well position relative to streams affect the size and location of the CAs. The results show that wells in this geologic setting are highly vulnerable to contaminants during extreme recharge events.
Article
Water Resources
Richelle M. Allen-King, Rebecca L. Kiekhaefer, Daniel J. Goode, Paul A. Hsieh, Michelle M. Lorah, Thomas E. Imbrigiotta
Summary: This study presents a new method for field measurement and numerical interpretation to parameterize the diffusion of trichloroethene (TCE) and its biodegradation products (DPs) in sedimentary rock. The method utilizes a dual-packer system to investigate a low-permeability section of the rock matrix and uses the monitoring history of a contaminated borehole to establish the pretest condition. Parameters such as the tortuosity factor, sorption coefficients, and biodegradation rate coefficients are estimated using a radial diffusion model. The field test results are consistent with laboratory experiments, demonstrating the effectiveness of the method in understanding contaminant distribution in rock matrices.
GROUND WATER MONITORING AND REMEDIATION
(2022)
Editorial Material
Geosciences, Multidisciplinary
Allen M. Shapiro, Frederick D. Day-Lewis
Article
Geosciences, Multidisciplinary
Allen M. Shapiro, Frederick D. Day-Lewis, William M. Kappel, John H. Williams
Summary: A state-space model is developed to estimate daily groundwater recharge using time-series of groundwater-level altitude and meteorological inputs. The model can provide real-time recharge estimates by utilizing real-time hydrologic and meteorological data.
Article
Environmental Sciences
W. Anderson McAliley, Frederick D. Day-Lewis, David Rey, Martin A. Briggs, Allen M. Shapiro, Dale Werkema
Summary: In this study, we propose and demonstrate a recursive-estimation framework that uses temperature time series collected at different vertical depths to infer groundwater/surface-water exchange. By calibrating the state-space model using the Extended Kalman Filter and Extended Rauch-Tung-Striebel Smoother, we can effectively estimate time-varying specific discharge. The algorithms are shown to be efficient and rapid for estimating seasonal time-varying flux, and are effective in the presence of rapidly changing flux and nonperiodic thermal boundary conditions, which are problematic for existing approaches.
WATER RESOURCES RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Allen M. Shapiro, Frederick D. Day-Lewis
Summary: Assimilating recent observations improves model outcomes for real-time assessments of groundwater processes. Filtering and fixed-lag smoothing produce better estimates of recharge compared to forecasting, reducing uncertainty and better representing time-varying observations. However, these methods are not necessarily mass conservative, unlike forecasting outcomes which are mass conservative.
Article
Microbiology
Jennifer C. Underwood, Denise M. Akob, Michelle Mi Lorah, Thomas E. Imbrigiotta, Ronald W. Harvey, Claire R. Tiedeman
Summary: Bioaugmentation is a promising strategy for enhancing trichloroethylene degradation in fractured rock, but slow or incomplete biodegradation can lead to stalling. This study examined the response of groundwater microbial populations to a bioaugmentation test and highlights the importance of studying microbial communities in situ.
FEMS MICROBIOLOGY ECOLOGY
(2022)