Article
Engineering, Civil
Abdelkrim Aharmouch, Brahim Amaziane
Summary: The multi-dimensional mass conservative numerical method is developed for solving transient variably saturated groundwater flow problems, which is particularly suitable for limited computational resources. The method discretizes the Richards equation spatially with a finite element method and temporally with an implicit Euler scheme, using mass-conservative and mass-lumping techniques to ensure stability. The method also approximates stiffness and mass matrices to reduce computational effort, achieving reliable results in benchmark tests and real field case problems.
JOURNAL OF HYDROLOGY
(2021)
Article
Mechanics
H. Asadi, M. Pourjafar-Chelikdani, N. P. Khabazi, K. Sadeghy
Summary: This study numerically investigates the spontaneous imbibition of shear-dependent fluids in a paper-based diagnostic kit using the modified Richards equation. The results show that the microstructure of the absorbent pad and its contact angle strongly influence the average velocity at the test line. The shear-thinning behavior of the test fluid is found to shorten the constant-velocity regime on the nitrocellulose membrane, but it can still be extended by manipulating the contact angle and/or choosing appropriate microstructure.
Article
Engineering, Chemical
Bin Zhou, Jiang Xu, Fazhi Yan, Shoujian Peng, Yabin Gao, Qixian Li, Liang Cheng
Summary: A custom-made large-scale test system was used to study the effects of gas pressure on coal-gas outburst (CGO) two-phase flow. Higher initial gas pressure led to higher solid-gas ratio, initial motion speed of CGO coal, and CGO intensity. Severe choking of two-phase flow and intermittent disturbances were observed, with a strong-disturbance zone developing in the middle of the roadway during the CGO process.
Article
Energy & Fuels
Tiantian Zhao, Hao Xu, Dazhen Tang, Peng Zong
Summary: This study conducted unsteady displacement experiments using coal samples based on nuclear magnetic resonance technology to monitor the interface effect between gas and water, establishing and verifying a new relative permeability model that considers the interface effect. The results show that in two-phase flow, the interface effect plays a dominant role, with the gas phase driving the water phase, resulting in a relative permeability of the water phase greater than 1.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Geosciences, Multidisciplinary
Abir Banerjee, Rima Chatterjee
Summary: The methodology developed for prospect identification in coalbed methane reservoirs involves establishing regression models to identify potential coal seams based on laboratory core sample analysis. Gas saturation and coal content can be estimated from organic content, and sweet spots for future well locations can be identified through overlaying seam thickness and gas content mapping. The study also demonstrates electro-facies classification using multi-resolution clustering architecture to capture texture parameters from resistivity image logs, aiding in lithology determination and production optimization in the Bokaro CBM reservoir in India.
NATURAL RESOURCES RESEARCH
(2021)
Article
Multidisciplinary Sciences
Johno van IJsseldijk, Hadi Hajibeygi, Kees Wapenaar
Summary: Reservoir simulations for subsurface processes are crucial for geothermal energy extraction and fluid storage. Integrating simulation results with seismic surveys is challenging due to the dynamics of the reservoir altering seismic parameters. This study develops a coupled simulation and seismic methodology to better understand fluid flow in subsurface reservoirs.
SCIENTIFIC REPORTS
(2023)
Article
Geochemistry & Geophysics
Ruijing Zhu, Rongxi Li, Xiaoli Wu, Xiaoli Qin, Bangsheng Zhao, Futian Liu, Di Zhao
Summary: This study investigated the fluid inclusions in the Permian sandstone and Ordovician dolomite reservoirs in the central-southern Ordos Basin, finding two phases of fluid inclusions that recorded the history of natural gas formation and accumulation. The diagenetic fluids in these reservoirs showed medium-low temperature and moderate-low salinity, with natural gas accumulation being related to the Yanshanian tectonic movement.
Article
Environmental Sciences
Kimberley A. Taylor, David Risk, James P. Williams, Grant D. Wach, Owen A. Sherwood
Summary: This study investigated the presence of methane in groundwater in the Stellarton Basin, Nova Scotia, Canada, finding that the majority of methane is of microbial origin, with some trace thermogenic gas likely originating from coal mines in the area. The data obtained in this study may be used as baseline information for future coal-bed methane operations in the region.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Mathematics, Applied
Denis Anuprienko, Ivan Kapyrin
Summary: This paper presents the application of the nonlinearity continuation method in the numerical solution of steady-state groundwater flow in variably saturated conditions. By solving a series of increasingly nonlinear problems using the Newton method, the system of nonlinear equations obtained from the finite volume discretization of steady-state Richards equation is addressed. A comparison is made with the pseudo-transient method on various test cases, including real site problems and parallel computations.
JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Sahil Wani, Rahul Samala, Ramesh Kannan Kandasami, Abhijit Chaudhuri
Summary: This study presents a custom-developed coupled THMC solver to realistically quantify the gas production and associated sediment deformation. The results indicate that the well-bore in the middle of the reservoir yields the highest cumulative gas production while differential settlement is minimum, thus making it a preferable location for placing the horizontal well-bores.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Geosciences, Multidisciplinary
Kang Yang, Wei Li, Lin Gao, Haifeng Wang, Jinzhao Liu, Jia Lin
Summary: A model of coalbed methane enrichment and extraction in abandoned mine gobs was established to study the migration law and seepage characteristics of CBM. It was found that during mine closure, CBM pressure gradually recovers and is positively correlated with the matrix pressure and diffusion coefficient of coal seam. Residual coal in the gob is the dominant source of CBM seepage during extraction, and the layout of surface wells, negative extraction pressure, and extraction time can affect CBM production and recovery.
NATURAL RESOURCES RESEARCH
(2023)
Article
Energy & Fuels
C. Ozgen Karacan
Summary: The dynamic properties of coal seams play a crucial role in the success of gas production and CO2-enhanced gas recovery. Predicting the distribution and evolution of these properties during production or injection operations can be important for field development and project economics. In this study, the dynamic properties of the Black Creek coal seam in Alabama were mapped using production history matching and geostatistics, showing similar patterns and global distributions despite some local discrepancies.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2021)
Article
Engineering, Chemical
Y. A. Boakye-Ansah, P. Grassia
Summary: By comparing and contrasting the solutions of foam drainage equation and Richards equation, significant differences in the traveling wave solutions at low moisture content and near saturation are found, mainly attributed to the soil material properties and the soil specific parameter m determined from the soil-water retention curve.
TRANSPORT IN POROUS MEDIA
(2021)
Article
Engineering, Petroleum
Tao Zhang, Farzam Javadpour, Jing Li, Yulong Zhao, Liehui Zhang, Xiangfang Li
Summary: Transport behaviors of single-phase gas and single-phase water at the nanoscale deviate from the predictions of continuum flow theory, especially when both gases and liquids flow simultaneously in pores or networks of pores. A pseudopotential-based lattice Boltzmann method was developed to simulate gas/water two-phase flow at the pore scale, incorporating fluid/fluid and fluid/solid interactions to capture microscopic interactions among phases. The study demonstrated the successful application of the proposed method in modeling gas/water two-phase flow in systems like single nanopores, parallel nanopores, and nanoporous media.
Article
Energy & Fuels
Zhihang Li, Xiong Hu
Summary: This paper proposes a method of measuring the gas diffusion coefficient of coal and rock by using the experimental method and establishes a calculation model for calculating the gas diffusion coefficient of coal and rock. The results show that it is feasible to calculate the diffusion coefficient of the gas in coal and rock according to the adsorption capacity of coal and rock. The diffusion coefficient increases with the increase in pressure, decreases with the increase in water saturation, and increases with the increase in temperature.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2021)
Article
Engineering, Civil
Arfan Arshad, Ali Mirchi, Javier Vilcaez, Muhammad Umar Akbar, Kaveh Madani
Summary: High-resolution, continuous groundwater data is crucial for adaptive aquifer management. This study presents a predictive modeling framework that incorporates covariates and existing observations to estimate groundwater level changes. The framework outperforms other methods and provides reliable estimates for unmonitored sites. The study also examines groundwater level changes in different regions and highlights the importance of effective aquifer management.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Lihua Chen, Jie Deng, Wenzhe Yang, Hang Chen
Summary: A new grid-based distributed karst hydrological model (GDKHM) is developed to simulate streamflow in the flood-prone karst area of Southwest China. The results show that the GDKHM performs well in predicting floods and capturing the spatial variability of karst system.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Faruk Gurbuz, Avinash Mudireddy, Ricardo Mantilla, Shaoping Xiao
Summary: Machine learning algorithms have shown better performance in streamflow prediction compared to traditional hydrological models. In this study, researchers proposed a methodology to test and benchmark ML algorithms using artificial data generated by physically-based hydrological models. They found that deep learning algorithms can correctly identify the relationship between streamflow and rainfall in certain conditions, but fail to outperform traditional prediction methods in other scenarios.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Yadong Ji, Jianyu Fu, Bingjun Liu, Zeqin Huang, Xuejin Tan
Summary: This study distinguishes the uncertainty in drought projection into scenario uncertainty, model uncertainty, and internal variability uncertainty. The results show that the estimation of total uncertainty reaches a minimum in the mid-21st century and that model uncertainty is dominant in tropical regions.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Z. R. van Leeuwen, M. J. Klaar, M. W. Smith, L. E. Brown
Summary: This study quantifies the effectiveness of leaky dams in reducing flood peak magnitude using a transfer function noise modelling approach. The results show that leaky dams have a significant but highly variable impact on flood peak magnitude, and managing expectations should consider event size and type.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Zeda Yin, Yasaman Saadati, M. Hadi Amini, Linlong Bian, Beichao Hu
Summary: Combined sewer overflows pose significant threats to public health and the environment, and various strategies have been proposed to mitigate their adverse effects. Smart control strategies have gained traction due to their cost-effectiveness but face challenges in balancing precision and computational efficiency. To address this, we propose exploring machine learning models and the inversion of neural networks for more efficient CSO prediction and optimization.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Qimou Zhang, Jiacong Huang, Jing Zhang, Rui Qian, Zhen Cui, Junfeng Gao
Summary: This study developed a N-cycling model for lowland rural rivers covered by macrophytes and investigated the N imports, exports, and response to sediment dredging. The findings showed a considerable N retention ability in the study river, with significant N imports from connected rivers and surrounding polders. Sediment dredging increased particulate nitrogen resuspension and settling rates, while decreasing ammonia nitrogen release, denitrification, and macrophyte uptake rates.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Xue Li, Yingyin Zhou, Jian Sha, Man Zhang, Zhong-Liang Wang
Summary: High-resolution climate data is crucial for predicting regional climate and water environment changes. In this study, a two-step downscaling method was developed to enhance the spatial resolution of GCM data and improve the accuracy for small basins. The method combined medium-resolution climate data with high-resolution topographic data to capture spatial and temporal details. The downscaled climate data were then used to simulate the impacts of climate change on hydrology and water quality in a small basin. The results demonstrated the effectiveness of the downscaling method for spatially differentiated simulations.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Tongqing Shen, Peng Jiang, Jiahui Zhao, Xuegao Chen, Hui Lin, Bin Yang, Changhai Tan, Ying Zhang, Xinting Fu, Zhongbo Yu
Summary: This study evaluates the long-term interannual dynamics of permafrost distribution and active layer thickness on the Tibetan Plateau, and predicts future degradation trends. The results show that permafrost area has been decreasing and active layer thickness has been increasing, with an accelerated degradation observed in recent decades. This has significant implications for local water cycle processes, water ecology, and water security.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Chi Zhang, Xu Zhang, Qiuhong Tang, Deliang Chen, Jinchuan Huang, Shaohong Wu, Yubo Liu
Summary: Precipitation over the Tibetan Plateau is influenced by systems such as the Asian monsoons, the westerlies, and local circulations. The Indian monsoon, the westerlies, and local circulations are the main systems affecting precipitation over the entire Tibetan Plateau. The East Asian summer monsoon primarily affects the eastern Tibetan Plateau. The Indian monsoon has the greatest influence on precipitation in the southern and central grid cells, while the westerlies have the greatest influence on precipitation in the northern and western grid cells. Local circulations have the strongest influence on the central and eastern grid cells.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Manuel Almeida, Antonio Rodrigues, Pedro Coelho
Summary: This study aimed to improve the accuracy of Total Phosphorus export coefficient models, which are essential for water management. Four different models were applied to 27 agroforestry watersheds in the Mediterranean region. The modeling approach showed significant improvements in predicting the Total Phosphorus diffuse loads.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Yutao Wang, Haojie Yin, Ziyi Wang, Yi Li, Pingping Wang, Longfei Wang
Summary: This study investigated the distribution and transformation of dissolved organic nitrogen (DON) in riverbed sediments impacted by effluent discharge. The authors found that the spectral characteristics of dissolved organic matter (DOM) in surface water and sediment porewater could be used to predict DON variations in riverbed sediments. Random forest and extreme gradient boosting machine learning methods were employed to provide accurate predictions of DON content and properties at different depths. These findings have important implications for wastewater discharge management and river health.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Saba Mirza Alipour, Kolbjorn Engeland, Joao Leal
Summary: This study assesses the uncertainty associated with 100-year flood maps under different scenarios using Monte Carlo simulations. The findings highlight the importance of employing probabilistic approaches for accurate and secure flood maps, with the selection of probability distribution being the primary source of uncertainty in precipitation.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Janine A. de Wit, Marjolein H. J. van Huijgevoort, Jos C. van Dam, Ge A. P. H. van den Eertwegh, Dion van Deijl, Coen J. Ritsema, Ruud P. Bartholomeus
Summary: The study focuses on the hydrological consequences of controlled drainage with subirrigation (CD-SI) on groundwater level, soil moisture content, and soil water potential. The simulations show that CD-SI can improve hydrological conditions for crop growth, but the success depends on subtle differences in geohydrologic characteristics.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Constantin Seidl, Sarah Ann Wheeler, Declan Page
Summary: Water availability and quality issues will become increasingly important in the future due to climate change impacts. Managed Aquifer Recharge (MAR) is an effective water management tool, but often overlooked. This study analyzes global MAR applications and identifies the key factors for success, providing valuable insights for future design and application.
JOURNAL OF HYDROLOGY
(2024)