Article
Geochemistry & Geophysics
Hong Li, Haiyang Yu, Nai Cao, Shiqing Cheng, He Tian, Shiying Di
Summary: The study suggests that it is challenging to characterize complex reservoirs using a homogeneous permeability model, and a heterogeneous model that considers permeability differences in tight reservoirs is preferred. Formation fluids coexist in multiple phases, and water saturation has a direct effect on production.
Article
Construction & Building Technology
Roberto Serpieri, Michela Monaco
Summary: In order to enhance sustainability, reliable methodologies are needed to estimate the service-life and maintenance periodicity of concrete structures, in order to reduce harm to the environment and societal costs. The watertightness of concrete is crucial for assessing its durability against weather exposure and is mainly determined by the permeability of the cement paste. A model is proposed in this study to enhance the assessment of permeability by considering capillary percolation and simultaneous flow at the gel and capillary scales.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Thermodynamics
Zeyu Guo, Qidong Fang, Mingyan Nong, Xingwei Ren
Summary: The study proposed an innovative permeability-hydrate saturation model based on Poiseuille's law and the Kozeny-Carman equation, which was verified to have satisfactory performance in predicting the permeability of hydrate-bearing sediments. The normalized permeability decreases non-linearly as void ratio increases for a given hydrate saturation, with higher sensitivity at high hydrate saturation. The model can capture the main feature of permeability with hydrate saturation for coarse-grained hydrate-bearing sediments.
Article
Engineering, Civil
Peijie Yin, Huihui Song, Hairui Ma, Wuchao Yang, Zhi He, Xiaonan Zhu
Summary: In this study, the permeability of porous media with sphere packing is investigated using the lattice Boltzmann method (LBM) and experimental studies. The accuracy of LBM is verified and the effects of porosity and particle size on permeability are studied. A modified Kozeny-Carman equation is proposed and validated through experimental tests.
JOURNAL OF HYDROLOGY
(2022)
Article
Engineering, Civil
Pei-Ning Li, Ye-Shuang Xu, Xu-Wei Wang
Summary: This study proposes a new modified K-C equation considering the derivation principle of the original K-C equation. By applying Poiseuille's law in porous media, the concept of 2D porosity (epsilon) and a correction coefficient for permeation (f) are presented. The parameters in the new modified K-C equation include specific surface area (S-0), tortuosity (1/cos theta), and ne. The prediction formulas for S-0 and 1/cos theta are deduced and verified by comparing them with established formulas and experimental data. The new modified K-C equation is adequate for predicting hydraulic conductivity for clay and sand by comparing it with experimental values and other established modified K-C equations.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Civil
Talita R. Ferreira, Nathaly L. Archilha, Luiz F. Pires
Summary: This study compares three XCT-based methods for estimating the permeability of soil aggregates and suggests calibrating faster methods against a slower but more reliable reference method using at least one 3D image. APES and PNM were found to be more time consuming than IBP-KC, with PNM being sensitive to thin pore ramifications.
JOURNAL OF HYDROLOGY
(2022)
Article
Mechanics
Zhaoqin Huang, Hao Wang, Xin Su, Weiwei Liao
Summary: This paper presents a two-scale fractal permeability model for natural vuggy porous media based on the fractal characteristics of interparticle pores and vugs. The results show that the predicted permeability varies within a certain range, with the maximum permeability occurring when larger vugs match with larger capillary tubes and the minimum permeability occurring in the opposite case. The validity of the proposed model is verified by comparing with experimental results and reference data in the literature. Parameter sensitivity analysis indicates that the fractal dimension and tortuosity of capillary tubes, as well as the maximum diameter of capillary tubes and vugs, have significant effects on the predicted permeability.
Article
Environmental Sciences
Haike Wang, Hui Qian, Yanyan Gao
Summary: The study established a macropore structure model of loess using X-ray CT technology, revealing anisotropic pore variation. By modifying equations, the anisotropy of hydraulic conductivity was investigated, and the results were verified through permeability tests.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Engineering, Civil
Jidong Teng, Antai Dong, Han Yan, Chenxi Tong, Sheng Zhang
Summary: In this study, a new hydraulic conductivity model for frozen coarse-grained soils is proposed based on the pattern of ice formation from the pore wall. The model shows better prediction results compared to existing models, particularly for sand. It can serve as a useful tool for simulating water-heat transfer process in cold regions.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Civil
Jidong Teng, Han Yan, Sihao Liang, Sheng Zhang, Daichao Sheng
Summary: The study developed a new hydraulic conductivity model for frozen soils based on the Kozeny-Carman equation, which can be used to explain the migration of water and heat in frozen soils compared to unfrozen soils. Parametric analysis revealed that unfrozen water saturation and shape coefficient ratio are important parameters affecting hydraulic conductivity. The proposed model can also be simplified to a power function for easy use.
JOURNAL OF HYDROLOGY
(2021)
Article
Geochemistry & Geophysics
Jinsui Wu, Min Xing, Shangxian Yin, Ciyuan Zhang, Xuexi Chen, Sihai Yi, Huiqing Lian, Dongyu Xie
Summary: The microstructure and permeability of low-permeability sandstone samples obtained from North China were studied using digital core technology. The researchers collected rock images using X-ray microcomputed tomography (mu CT) and analyzed the microstructure to calculate parameters such as porosity, connected porosity, average equivalent diameter, tortuosity, and shape factor. By introducing the shape factor into the Kozeny-Carman equation, they modified the equation to include porosity, particle diameter, tortuosity, and particle shape factor.
Article
Thermodynamics
Didi Wu, Shuxia Li, Ningtao Zhang, Yang Guo, Lu Liu, Zhiqiang Wang
Summary: In this paper, a novel normalized permeability model was established to capture the dynamic characteristic of permeability in hydrate-bearing sediments. The model was verified and compared with existing models using different published data. Results showed that the proposed model was more powerful and better captured the permeability evolution in hydrate-bearing sediments at various conditions.
Article
Engineering, Civil
Yu Zhong, Annan Zhou, Jiapei Du, Jidong Teng, Shui-long Shen
Summary: This study modifies the classical KC equation to consider the influence of clay surface characteristics and nanoscale pores on the saturated hydraulic conductivity in clayey soils. Through molecular dynamics modeling, a specific function is proposed to quantify the adsorbed proportion, and the modified equation is validated with experimental data, showing high accuracy.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Chemical
Zeyu Feng, Yuping Fan, Xianshu Dong, Xiaomin Ma, Ruxia Chen
Summary: The separation of particulate solids from liquids by filtration is crucial in industrial processes. The microstructure and permeability of filter cake are important factors influencing fluid flow efficiency and mass transfer. Through filtration tests and simulation analysis, it is discovered that the fluid flux in filter cake is strongly related to the width of main channels, and improving pore connectivity and size is more effective in enhancing cake permeability than increasing porosity and number of pores.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Chemical
Boqi Xiao, Huaizhi Zhu, Fengye Chen, Gongbo Long, Yi Li
Summary: This study investigates the seepage of particles in porous media and proposes a novel fractal model for the Kozeny-Carman constant and dimensionless permeability of roughened porous media. The model considers structural parameters such as porosity, fractal dimensions, relative roughness, and fluctuation amplitude of capillary cross-section size. The results show that increasing fluctuation amplitude leads to an increase in the Kozeny-Carman constant and a decrease in dimensionless permeability. Furthermore, the proposed model is validated by experimental data and can provide a theoretical basis for various practical applications in petroleum engineering and the fuel-cell industry.
Article
Geosciences, Multidisciplinary
Michael Cardiff, Ben Heinle
Article
Geosciences, Multidisciplinary
Claire R. Tiedeman, Warren Barrash
Article
Environmental Sciences
Elena C. Reinisch, Michael Cardiff, John Akerley, Ian Warren, Kurt L. Feigl
Article
Geosciences, Multidisciplinary
Michael Cardiff, YaoQuan Zhou, Warren Barrash, Peter K. Kitanidis
Article
Environmental Sciences
Elena C. Reinisch, S. Tabrez Ali, Michael Cardiff, J. Ole Kaven, Kurt L. Feigl
Article
Geochemistry & Geophysics
Elena C. Reinisch, Michael Cardiff, Corne Kreemer, John Akerley, Kurt L. Feigl
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Geography, Physical
C. J. Roland, L. K. Zoet, J. E. Rawling, M. Cardiff
Summary: The study indicates that freeze-thaw environmental factors have a significant impact on the erosion of coastal bluffs at seasonal timescales, leading to increased pore pressures and frequent mass wasting events. Seasonal upslope erosion is primarily influenced by rising water levels and freeze-thaw processes, necessitating the inclusion of these transient conditions in landscape change models.
Article
Geosciences, Multidisciplinary
Jeremy R. Patterson, Michael Cardiff
Summary: Characterizing aquifer properties and their associated uncertainty is a challenge in hydrogeology. Using oscillatory flow interference testing can help characterize aquifer flow properties. Studies show that multi-frequency testing improves inversion performance and decreases parameter uncertainty.
Article
Geosciences, Multidisciplinary
Catherine Christenson, David J. Hart, Michael Cardiff, Susan Richmond, Dante Fratta
Summary: This article presents a method for improving the communication of hydrologic data to the public by connecting data to video representations. The authors collected water-quality and geophysical data using multiple instruments mounted on a canoe and recorded video using GoPro cameras. The data was georeferenced and logged using an Arduino microcontroller. The results show that the low-cost sensors performed well and the data-rich video provided context for the measurements. This method enhances spatial understanding of hydrogeologic systems and facilitates communication and management of sensitive habitats.
Article
Geosciences, Multidisciplinary
Michael Cardiff, Laura Schachter, Jake Krause, Madeline Gotkowitz, Brian Austin
Summary: Increased nitrate concentrations in groundwater and surface waters due to modern agriculture is a widespread and significant environmental issue. However, there is a lack of understanding regarding the specific contributions of individual agricultural fields and practices. In this study, a minimally invasive approach using edge-of-field monitoring and tracer application was developed to calculate annual nitrogen loss to groundwater. Results from a commercial field in Wisconsin showed that nitrogen losses were similar to previous studies, with more than 25% of applied nitrogen leaching to groundwater each year. This method provides a reliable estimation of nitrogen loss when using certain conditions, such as injecting the tracer directly at the water table and analyzing nitrate concentrations in the laboratory.
Letter
Geosciences, Multidisciplinary
Carsten Leven, Warren Barrash
Article
Environmental Sciences
Kan Bun Cheng, Gedeon Dagan, Warren Barrash, Michael Cardiff, Avinoam Rabinovich
Summary: Characterizing aquifer heterogeneity is crucial for accurate flow and transport modeling. This study presents a new approach for statistically analyzing hydraulic properties in continuous pumping tomography tests of phreatic aquifers. The method involves determining equivalent hydraulic conductivity, specific storage, and specific yield at multiple locations and calculating statistical moments assuming random space variables. The results show that the spatial averages of the equivalent properties decrease with distance from the pumping well and stabilize at larger distances, consistent with existing theory.
WATER RESOURCES RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Jeremy R. R. Patterson, Michael Cardiff
Summary: Fractured sedimentary bedrock aquifers are complex flow systems with fast fractures and slow porous media-dominated flow paths. Previous studies have used oscillatory flow testing to characterize single bedrock fractures but relied on an idealized analytical model. This study extends the testing to fractured sedimentary bedrock and suggests that other hydraulic processes are needed to accurately represent pressure propagation.
Article
Energy & Fuels
Jeremy R. Patterson, Michael Cardiff, Kurt L. Feigl
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)