Article
Water Resources
Geng Cui, Yan Liu, Xiaosi Su, Shouzheng Tong, Ming Jiang
Summary: This study improves the accuracy of groundwater recharge simulation in riparian zones by analyzing the relationship between riverbed hydraulic conductivity (RHC) and sediment particle size. The findings are important for assessing groundwater resources and adjusting pumping rates in riparian areas.
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
(2022)
Article
Green & Sustainable Science & Technology
Bin Hu, Linmei Liu, Ruihui Chen, Yi Li, Panwen Li, Haiyang Chen, Gang Liu, Yanguo Teng
Summary: This research investigates the physical and chemical clogging issues in riverbank filtration (RBF) through laboratory column experiments. The results show that RBF can improve water quality, but the clogging issues should not be ignored.
Article
Engineering, Geological
Suaiba Mufti, Arghya Das
Summary: This paper presents a pore-scale model for predicting unsaturated hydraulic conductivity along drying and wetting paths in unsaturated soils. The model combines the discrete element method for soil packing and pore network modeling to simulate fluid flow, incorporating pore-scale phenomena. The predicted hydraulic conductivity compares favorably to experimental data and outperforms other physically-based models.
Article
Geosciences, Multidisciplinary
Chengcheng Wu, Chengpeng Lu, Jing Chen, Jingyu Liu, Hongwei Zhang, Ebrima Saidy, Bo Liu, Longcang Shu
Summary: This study conducted a detailed field experiment in the Xiushui River, China, to measure the hydraulic conductivity of riverbank sediments using grain-size distribution analysis. The results showed that the hydraulic conductivity exhibited consistent spatial distribution trends before and after the flood season. It was also found that the flood process enhanced the heterogeneity of the riverbank sediments.
Article
Geosciences, Multidisciplinary
Kaili Zhang, Zheng Gong, Kun Zhao, Keyu Wang, Siqi Pan, Giovanni Coco
Summary: The study investigates the stability of overhanging riverbanks through laboratory experiments and numerical simulations. Results show that flow infiltration leads to decreased soil shear strength and shear failure. The distance of the failure surface can be characterized by twice the width of the overhanging block.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2021)
Article
Geosciences, Multidisciplinary
Ismail Abd-Elaty, Osama K. Saleh, Hala M. Ghanayem, Martina Zelenakova, Alban Kuriqi
Summary: The main challenge in water resource management, especially in developing countries, is finding non-traditional methods to obtain safe drinking water in sufficient quantities. In Egypt, the riverbank filtration system has shown great potential in improving the quality of river water. This study focuses on the drinking water plant in Embaba, Egypt and examines the impact of implementing a gravel-pack filter system through numerical simulations. The results indicate that increasing the filter width, thickness, and pipe numbers can improve the riverbank filtration sharing rate, while increasing the filter width at the groundwater side can reduce the thickness of the river bed. The design of the riverbank filtration system should take into account factors such as gravel-pack design, pipe filter geometry, and permeability.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Energy & Fuels
Hwajung Yoo, Sehyeok Park, Linmao Xie, Kwang-Il Kim, Ki-Bok Min, Jonny Rutqvist, Antonio Pio Rinaldi
Summary: This study presents comprehensive coupled hydro-mechanical numerical modeling of the first and second hydraulic stimulations at the Pohang enhanced geothermal system (EGS) site. The key hydro-mechanical processes of shear slip and dilation and hydraulic jacking observed in the fractured reservoir can be successfully reproduced through numerical modeling.
Article
Water Resources
D. Knabe, D. Dwivedi, H. Wang, C. Griebler, I. Engelhardt
Summary: While induced bank filtration is an effective method for sustainable drinking water production, it is susceptible to surface water contaminations. This study monitored the concentrations of adenoviruses and pathogen indicators over 16 months at an active bank filtration plant in Germany to analyze the effect of seasonal changes on pathogen transport. A groundwater model was created to simulate various factors, and the results showed that travel time and travel distance were key factors for the removal of coliforms, coliphages, and adenoviruses.
ADVANCES IN WATER RESOURCES
(2023)
Article
Engineering, Geological
Shubham A. Kalore, Sivakumar G. L. Babu, Ratnakar R. Mahajan
Summary: A granular filter must meet retention and hydraulic conductivity requirements. The design approach is based on representative grain sizes for these requirements, with an emphasis on considering grain-size distribution. Criteria are presented for assessing retention and hydraulic conductivity based on grain-size distribution. Probabilistic assessment criteria are developed for retention requirements, with grain size and constriction size as random variables, and for hydraulic conductivity requirements, considering variability and a semi-analytical model. The proposed approach is illustrated with examples, showing that the filter bandwidth is controlled by the convexity of the soil grain-size distribution.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2021)
Article
Geosciences, Multidisciplinary
Yi Luo, Jiaming Zhang, Zhi Zhou, Juan P. Aguilar-Lopez, Roberto Greco, Thom Bogaard
Summary: This work presents an experimental and numerical study of preferential flow induced by desiccation cracks (PF-DC) considering the dynamic changes of cracks. Experimental results showed that the maximum crack ratio and aperture decreased with higher evaporation intensity, and self-closure phenomenon of cracks was observed during low-evaporation periods. Simulation results showed that the dynamic dual-permeability preferential flow model (DPMDy) better described crack evolution and hydrological response compared to the single-domain model (SDM) and rigid dual-permeability model (DPM) with fixed crack ratio and hydraulic conductivity.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2023)
Article
Environmental Sciences
Weiyan Pan, Quanzhong Huang, Guanhua Huang, Liting Xing
Summary: Riverbank filtration is a natural aquifer-based process where nitrogen dynamics are influenced by factors such as temperature, water quality, and travel time. A field experiment and modeling using HYDRUS-2D software showed that nitrate transport during riverbank filtration can be accurately simulated, with denitrification rate constants increasing exponentially with temperature. The study also found that most nitrate removal occurs in the riparian zone during high temperatures.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Jesus F. Aguila, Mark C. McDonnell, Raymond Flynn, Adrian P. Butler, Gerard A. Hamill, Georgios Etsias, Eric M. Benner, Shane Donohue
Summary: This paper compares eight different methods for estimating the saturated hydraulic conductivity of a quasi-homogeneous coastal sand aquifer. The results show significant variations in the estimated hydraulic conductivity among the methods, indicating the influence of measurement scale and heterogeneity.
ENVIRONMENTAL EARTH SCIENCES
(2023)
Article
Materials Science, Ceramics
Chitrarasu Kaliyaperumal, Sundeep Kumar Marndi, Amirthapandian Sankarakumar, Thangadurai Paramasivam
Summary: The influence of grain size on the electrical properties of nanocrystalline La2Zr2O7 (LZO) ceramics prepared by chemical co-precipitation was investigated. The XRD and Raman scattering analysis confirmed the pyrochlore structure of La2Zr2O7. SEM and XPS were used to study the morphology and chemical composition. Impedance spectroscopy revealed that the conductivity was contributed by both grains and grain boundaries, with a non-Debye nature of conduction. The activation energy for grain conduction was consistent across different grain sizes, while the activation energy for grain boundary conduction decreased with increasing grain size, indicating oxygen ion migration. The conduction mechanism was dominated by non-overlapping small polaron tunneling, and ion-ion correlation increased with larger grain size.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Geological
Shubham A. Kalore, G. L. Sivakumar Babu
Summary: This paper presents a new probabilistic retention criterion for geotextile filtration, taking into account the random nature of soil grain and geotextile constriction sizes. It also proposes a theoretical approach to predict the constriction size distribution and the expected partial clogging of geotextile. The developed design criteria are applicable to various types of soils and offer an improvement in design compared to existing criteria.
GEOTEXTILES AND GEOMEMBRANES
(2022)
Article
Engineering, Geological
Shubham A. Kalore, G. L. Sivakumar Babu
Summary: This paper proposes a design criterion for the hydraulic conductivity requirements of a filter and validates the developed model through experimental evaluations. The model is applicable for both saturated and partially saturated conditions and offers an improvement in the design standards and guidelines for protective filters.
GEOTEXTILES AND GEOMEMBRANES
(2022)