Article
Nuclear Science & Technology
Victor Malkovsky, Sergey Yudintsev
Summary: This study developed a model and conducted a 3-D computer simulation to investigate the migration of radionuclides from an underground repository for vitrified high-level radioactive waste. The results indicate that a distance of 240 meters or more from the ground surface is sufficient for the safe disposal of this type of waste.
PROGRESS IN NUCLEAR ENERGY
(2022)
Article
Geochemistry & Geophysics
Hamid Shafiee, Elaheh NikzadehAbbasi, Majid Soltani
Summary: The research investigates the effects of a magnetic field on water/Al2O3 nanofluid in a porous medium through computational simulations. It shows that the heat transfer coefficient increases with higher Hartmann and Darcy numbers, and the composition of the nanofluid enhances the performance evaluation criteria.
Article
Construction & Building Technology
Kyung-Woo Park, Chae-Soon Choi, Byeong-Hak Park, Sung-Hoon Ji
Summary: The study investigates the influence of stress redistribution on the hydraulic properties of fractures around a borehole during the installation and expansion process. Numerical and experimental methods were used, and the results indicate that stress redistribution leads to an increase in fracture apertures and transmissivity, suggesting the potential for a deposition hole to become a conduit for nuclides.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Geochemistry & Geophysics
Kosuke Kayama, Hitoshi Mikada, Junichi Takekawa
Summary: This study investigates the effect of tensile fracture in a vertical borehole under anisotropic horizontal stress conditions on the dispersion of flexural wave generated in dipole sonic logging. The numerical results suggest that the deeper the penetration depth of a tensile fracture, the slower the slowness of shear waves polarized perpendicular to the tensile fracture. This information could potentially be used to determine the depth of penetration of a tensile fracture created by drilling or hydraulic fracturing.
GEOPHYSICAL PROSPECTING
(2021)
Article
Energy & Fuels
Bing Wang, Wei Li, Qing Ye, Kun-Yu Ma
Summary: This paper proposes a nonparametric spectrum estimation method to obtain phase dispersion characteristics and attenuation coefficient. The method can invert phase velocity, attenuation coefficient, and amplitude from recorded waveforms. Performance analysis shows that the proposed method achieves high resolution and precision, and maintains stability. Applications to synthetic waveforms and real data demonstrate its efficiency.
Article
Thermodynamics
V. Djotsa Nguimeya Ngninjio, Christof Beyer, Bo Wang, Sebastian Bauer
Summary: This study investigates the impact of thermally induced convection on heat transfer behavior near borehole heat exchangers. It found that convection can significantly increase heat transfer rates at high temperatures, but decrease rates during heat discharge. The study also analyzed the effects of Rayleigh numbers, buoyant flow velocities, and the center of heat on convection.
APPLIED THERMAL ENGINEERING
(2024)
Article
Geosciences, Multidisciplinary
Tim W. Geerits, Maik Linke, Olaf Hellwig, Stefan Buske
Summary: This paper addresses the forward scattering problem in the context of multipole borehole acoustic measurements, deriving explicit expressions for the far-field scattered wavefield in the borehole fluid. The results could potentially be used as a fast forward operator in developing a full waveform inversion technique. The analytical expressions provide insights into the borehole fluid scattered pressure with small source-receiver offsets and different configurations of the scatterer relative to the borehole axis.
JOURNAL OF APPLIED GEOPHYSICS
(2021)
Article
Thermodynamics
R. Siddharth, Shaik Subhani, Rajendran Senthil Kumar
Summary: The study investigates the flow and heat transfer characteristics of two hot circular bodies in a 2D simulation. By optimizing the geometry, maximum heat dissipation can be achieved. The positioning of the cylinders in the enclosure has a significant impact on heat transfer rate.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Environmental Sciences
Victorita Radulescu
Summary: In recent decades, there has been a lack of flood management plans in Romania, particularly in areas prone to repeated floods such as the Siret River basin. This paper examines the natural transport capacity of the Siret River and proposes solutions to mitigate the effects of floods and protect the population, agriculture, and environment. The mathematical model of sediment transport is analyzed based on direct measurements and data recorded during the floods of 2005 and 2020.
Article
Chemistry, Multidisciplinary
Abdul Hamid Ganie, Basharat Ullah, J. EL Ghoul, Kiran Zahoor, Umar Khan
Summary: This study examines the flow and heat transfer of nanofluids in a non-parallel walled channel. A mathematical model is established and numerical solutions are obtained by transforming the equations into a non-dimensional form. Graphical analysis is performed to study the effects of various factors on the flow and temperature profiles.
NANOSCALE ADVANCES
(2023)
Article
Mechanics
K. Kundu, U. K. Sarkar
Summary: This study analyzes the laminar flow through a semi-elliptic annulus formed between two confocal elliptical ducts driven by a constant pressure-gradient. Using the elliptic cylindrical coordinate system, exact solutions for wide and narrow semi-elliptic annuli are obtained. The velocity distribution, volume flow rate, shear stress, and Poiseuille number are expressed using non-dimensional physical parameters. The results show characteristic differences between wide and narrow semi-elliptic annuli. Additionally, a numerical method is formulated for obtaining the numerical solution, which agrees with the analytical results. Published under an exclusive license by AIP Publishing.
Article
Oceanography
Marie-Pierre C. Delisle, Timu W. Gallien, Yeulwoo Kim
Summary: Understanding the interaction between waves and beach groundwater in the swash zone is crucial for predicting coastal hazards accurately. While the influence of surface flows on beach groundwater has been extensively studied, the impact of beach groundwater on swash flow behaviors is not well understood.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Multidisciplinary Sciences
Adnan, Umar Khan, Naveed Ahmed, Syed Tauseef Mohyud-Din, M. D. Alsulami, Ilyas Khan
Summary: Investigating the thermal performance of nanofluids for unsteady boundary layer flow with the consideration of suction/injection effects is an important research area in the field of fluid dynamics. The numerical analysis of ND-H2O and Ag-H2O nanofluids reveals their high thermal performance characteristics, with the Ag-based nanofluid exhibiting better heat transfer performance. A graphical and tabular comparison is provided to validate the analysis under certain assumptions.
SCIENTIFIC REPORTS
(2022)
Article
Energy & Fuels
Peng Zhao, Xiaozhao Li, Donghai Zhang, Yungzhi Lin, Ye Zhang, Yukun Ji
Summary: Vertical borehole heat exchangers (VBHEs) are considered as sustainable geotechnical technologies for building heating or cooling. However, most current numerical models assume subsurface homogeneity, neglecting the layered structure and groundwater seepage. This study proposes an improved numerical model that considers the coupled condition of groundwater seepage, layered subsurface, and heat transfer at different locations within VBHEs. The model is applied to investigate the thermal behaviors of VBHE arrays in different arrangements and discusses the influence of groundwater seepage on their heat transfer ability. The results show that seepage can effectively improve the heat transfer performance of VBHEs.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2023)
Article
Mechanics
Min Chan Kim
Summary: In this study, the onset of gravitational instabilities in a horizontal fluid layer due to CO2 dissolution was analyzed theoretically and numerically. New stability equations were derived and it was proved that normal mode stability analysis is possible in certain cases. The effects of swelling and viscosity lowering on stability and pattern formation on the dissolving interface were also analyzed.
Article
Energy & Fuels
Jacek Majorowicz, Kirk Osadetz, Jan Safanda
Article
Meteorology & Atmospheric Sciences
Vladimir Cermak, Louise Bodri, Milan Kresl, Petr Dedecek, Jan Safanda
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2017)
Article
Environmental Sciences
Petr Dedecek, Jan Safanda, Dusan Rajver
Article
Geochemistry & Geophysics
Vladimir Cermak, Louise Bodri, Jan Safanda
EARTH AND PLANETARY SCIENCE LETTERS
(2009)
Article
Geochemistry & Geophysics
J. Majorowicz, S. E. Grasby, J. Safanda, B. Beauchamp
EARTH AND PLANETARY SCIENCE LETTERS
(2014)
Article
Energy & Fuels
Jacek Majorowicz, Kirk Osadetz, Jan Safanda
Article
Geosciences, Multidisciplinary
Vladimir Cermak, Jan Safanda, Louise Bodri
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2010)
Article
Geosciences, Multidisciplinary
Jacek Majorowicz, Jan Safanda, Rajmund Przybylak
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2014)
Article
Geosciences, Multidisciplinary
Jacek Majorowicz, Jan Safanda
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2015)
Article
Geochemistry & Geophysics
Jacek Majorowicz, Walter Skinner, Jan Safanda
JOURNAL OF GEOPHYSICS AND ENGINEERING
(2012)
Article
Geochemistry & Geophysics
Petr Dedecek, Dusan Rajver, Vladimir Cermak, Jan Safanda, Milan Kresl
JOURNAL OF GEOPHYSICS AND ENGINEERING
(2013)
Article
Geochemistry & Geophysics
Ilmo T. Kukkonen, Volker Rath, Liisa Kivekas, Jan Safanda, Vladimir Cermak
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2011)
Article
Geochemistry & Geophysics
Vladimir Cermak, Louise Bodri, Jan Safanda, Milan Kresl, Petr Dedecek
STUDIA GEOPHYSICA ET GEODAETICA
(2014)
Article
Geosciences, Multidisciplinary
J. Majorowicz, J. Safanda, K. Osadetz
CLIMATE OF THE PAST
(2012)
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)