Article
Geosciences, Multidisciplinary
W. R. Assis, E. M. Franklin
Summary: The study investigates the size-regulating mechanisms of barchans through binary exchanges, identifying five different patterns and proposing classification maps. By observing the interaction between dunes and the motion of grains in experiments, the researchers were able to analyze the trajectories of individual grains, their diffusion length, and provide new insights into the mechanisms of barchans found on Earth and other planets.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2021)
Article
Geosciences, Multidisciplinary
Jia Guang-Pu, Yang Guang, Han Xue-Ying, Zuo He-Jun, Yao Yun-Feng
Summary: Although many studies have been conducted on barchan dunes in deserts and sandy areas around the world, few studies have focused on the morphological characteristics and movement patterns of barchan dunes in the Yamarak Desert, China. This study measured and calculated the morphologies of several typical barchan dunes using 3-D laser scanning and remote sensing image interpretation. The results showed the average coverage of barchan dunes in the Yamarak Desert was 37.19%, and their movement velocity ranged from 0-20 m/a. The direction of movement was consistent with the main wind direction of the area. This study highlights the need for future research to consider other factors affecting barchan dunes in the Yamarak Desert and to pay attention to new wind-sand and geohazards in the downwind corridor.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Environmental Sciences
Ahmed Fadili, Saliha Najib, Othmane Boualla, Abdelhadi Makan, Khalid Mehdi, Abdel-Ali Kharis
Summary: In this study, geostatistical methods were used to estimate the geohydraulic parameters of aquifers in the Sahel Doukkala region of western Morocco. The transformation of vertical electrical soundings (VES) data into electrical resistivity tomography (ERT) profiles allowed for a more comprehensive analysis. The results demonstrated the reliability of the proposed approach, with a low inversion error (RMS) and estimated values for hydraulic conductivity, effective porosity, and transmissivity reflecting the lithology and aquifer potential of the study area. The validation of the results with pumping test data further confirmed their representativeness.
ENVIRONMENTAL EARTH SCIENCES
(2023)
Article
Environmental Sciences
Hossein Ghazanfarpour, Mohsen Pourkhosravani, Sayed H. Mousavi, Ali Mehrabi
Summary: This study elaborated on the morphological properties of barchans in the Pashoueyeh Erg region of the Lut Desert in Iran using mathematical and statistical models, which are important for investigating barchan shapes and behavior. The mathematical modeling of barchan shapes was conducted through parabolic equations, while the statistical modeling determined the relationships between barchan morphology and mathematical parameters. The combination of these methods provides a strong basis for simulating barchans in virtual and laboratory environments, with the focal length being identified as a crucial parameter affecting the width, dimensions, and volume of barchans.
JOURNAL OF ARID LAND
(2021)
Article
Geosciences, Multidisciplinary
Aaron Peche, Georg J. Houben
Summary: This study provides a novel procedure to derive representative grain diameters and effective porosity from values of hydraulic conductivity. The procedure was applied on a large data set and practical examples were given to demonstrate its applicability.
Article
Environmental Sciences
H. S. Virupaksha, K. N. Lokesh
Summary: The Electrical resistivity method and RS & GIS techniques were utilized to identify and classify potential aquifer zones based on their relationship with groundwater, revealing that most areas have relatively high groundwater potential.
GEOCARTO INTERNATIONAL
(2021)
Article
Mathematics, Interdisciplinary Applications
Xiaoming Zhao, Binbin Yang, Shichong Yuan, Zhenzhou Shen, Di Feng
Summary: The hydraulic conductivity, fractal dimension, and porosity of embankment soil have strong randomness, which limits the application of fractal theory in embankment engineering. This study investigates the relationship between hydraulic conductivity and fractal dimension, revealing the internal connection between hydraulic gradient, fractal dimension, and hydraulic conductivity.
FRACTAL AND FRACTIONAL
(2022)
Article
Geochemistry & Geophysics
Chao Zhuang, Xiangdong Xu, Zhi Dou, Chun Zhu, Yun Yang, Jinguo Wang, Zhifang Zhou
Summary: This study develops an innovative analytical model to analyze the effects of vertical heterogeneity on tidal wave propagation in coastal leaky aquifer systems. The research reveals that the differences in hydraulic conductivity and specific storage between layers in the aquifer significantly affect the amplitude and phase shift of groundwater level fluctuations.
Article
Engineering, Civil
Uttam Singh, Pramod Kumar Sharma
Summary: This study used eight empirical equations to estimate the saturated hydraulic conductivity of soil, and found that most of them had poor correlation with surface NMR hydraulic conductivity. The Kozeny-Carman, Hazen, and Zamarin equations showed the best performance. The Kozeny-Carman equation was modified to improve its accuracy and had the highest correlation with the surface NMR hydraulic conductivity.
JOURNAL OF HYDROLOGY
(2023)
Article
Environmental Sciences
B. Negreiros, A. Aybar Galdos, L. Seitz, M. Noack, S. Schwindt, S. Wieprecht, S. Haun
Summary: This study introduces a Multi-Parameter Approach to quantify clogging and vertical hyporheic connectivity, which builds on standardized measurements of physical and bio-geochemical parameters. It provides a representative appreciation of physical riverbed clogging and locates clogged layers in the hyporheic zone. The method has the potential to guide field surveys.
RIVER RESEARCH AND APPLICATIONS
(2023)
Article
Water Resources
Priyanka Bangalore Nagaraj, Mohan Kumar Mandalagiri Subbarayappa, Vouillamoz Jean-Michel, Johan Hoareau
Summary: The study proposes a methodology to estimate hydraulic parameters for coastal aquifers with unconsolidated formations, establishing a relationship between hydraulic conductivity and resistivity. The established correlations can be used as an important input to groundwater models, providing critical insights into the estimation of vertical hydraulic conductivity. This innovative approach has the potential to estimate anisotropic hydraulic conductivity for aquifers with embedded clayey formations.
HYDROLOGICAL PROCESSES
(2021)
Article
Soil Science
Jiazhou Chen, Zhangli Wu, Tieming Zhao, Huiyan Yang, Qi Long, Yangbo He
Summary: This study compared the root performance of different rotation crops and their effects on soil hydraulic properties, revealing that the productivity of clayey Utisol in southern China is limited by poor soil hydraulic properties. All crops contributed to improving soil hydraulic properties, with fine roots playing a key role in forming aeration and active capillary pores.
SOIL & TILLAGE RESEARCH
(2021)
Article
Environmental Sciences
Ammar El-Husseiny
Summary: This study presents a unified packing model to predict porosity and hydraulic conductivity of binary mixed soils based on fines fraction, achieving significant improvement in prediction accuracy compared to existing models. The model provides insights for optimizing soil mixing design and requires less laboratory measurements for predicting hydraulic conductivity.
Article
Engineering, Environmental
Maki Ito, Shahid Azam
Summary: This research aimed to determine the hydraulic properties of evaporitic rocks through a detailed characterization protocol using samples from southern Saskatchewan, Canada. The study found that air entry values, residual suction values, and saturated hydraulic conductivities varied for anhydrites and dolomites, with fitting equations showing good correlation with vapour flow.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Engineering, Environmental
C. Fallico, S. De Bartolo, G. F. A. Brunetti, G. Severino
Summary: The experimental study aimed to identify the hydraulic conductivity in an aquifer through different configurations and found a power law relationship between conductivity and porosity. By determining the proper fractal model, valuable indications about dispersion phenomena in aquifers were provided, particularly concerning the crucial role of tortuosity.
STOCHASTIC ENVIRONMENTAL RESEARCH AND RISK ASSESSMENT
(2021)