Results 31 to 40 of about 19,437 (260)

Dispersion in groundwater flow systems

, 1969
A fundamental flow equation for a mixture of miscible fluids was derived by combining the law of conservation of mass, Darcy's law, and an equation of state describing the pressure-volume-temperature- concentration relationship. The result is an equation involving two dependent variables, pressure and concentration.
Reddell, Donald Lee, author, Sunada, D. K., advisor, Breitenbach, E. A., committee member, Waltz, James P., committee member, Evans, Normal A., committee member, Morel-Seytoux, H. J., committee member, Corey, A. T., committee member   +6 more
openaire   +2 more sources

Impacts of groundwater extraction on groundwater flow and arsenic distribution in the western Hetao Basin, Inner Mongolia, China [PDF]

E3S Web of Conferences, 2019
Temporal variations in water levels are crucial for understanding As behaviour in groundwater systems. Groundwater levels were recorded in irrigation wells in non-irrigation and irrigation seasons.
Zhang Zhuo, Guo Huaming, Zhao Weiguang, Weng Haicheng   +3 more
doaj   +1 more source

Assessment of Nitrate in Groundwater from Diffuse Sources Considering Spatiotemporal Patterns of Hydrological Systems Using a Coupled SWAT/MODFLOW/MT3DMS Model

Hydrology, 2023
In recent years, due to various anthropogenic activities, such as agriculture and livestock, the presence of nitrogen-associated contaminants has been increasing in surface- and groundwater resources.
Alejandra Correa-González, Joel Hernández-Bedolla, Marco Antonio Martínez-Cinco, Sonia Tatiana Sánchez-Quispe, Mario Alberto Hernández-Hernández   +4 more
doaj   +1 more source

Natural isotopes support groundwater origin as a driver of mire type and biodiversity in Slitere National Park, Latvia [PDF]

Mires and Peat, 2020
Slitere National Park in Latvia is home to rich fens with many endangered and threatened plant species. This study aims to address how the hydrological systems affect vegetation biodiversity (cf. Wolejko et al.
S. Elshehawi, A. Espinoza Vilches, O. Aleksans, M. Pakalne, L. Wolejko, P. Schot, A.P. Grootjans   +6 more
doaj   +1 more source

Groundwater flow system in Aso caldera

Journal of Japanese Association of Hydrological Sciences, 2011
The groundwater flow system in Aso caldera is divided into four areas ( ( I ) somma of Aso volcano, ( II ) central cones side of the Aso volcano, ( III ) caldera low land unconfined groundwater and ( IV ) caldera low land artesian system) based on hydrogeochemical characteristics such as stable isotope values ( δ D and δ18O) and water chemistry ...
Makoto KAGABU, Jun SHIMADA, Yasuo SHIMANO, Satoru HIGUCHI, Shoko NODA   +4 more
openaire   +2 more sources

Analysis and identification of sulfate sources in groundwater of a typical profile in the Yinchuan Plain

Journal of Hydrology: Regional Studies
Study region: The Yinchuan Plain in China. Study focus: In large watersheds with diverse landforms, multi-level nested groundwater flow systems drive complex sulfate transport and transformation.
Ning Liu, Wenke Wang, Deshuai Ji, Zongyu Chen, Yazhen Du   +4 more
doaj   +1 more source

Analytical Study of Unsteady Nested Groundwater Flow Systems [PDF]

Mathematical Problems in Engineering, 2015
Two analytical solutions using segregation variable method to calculate the hydraulic head under steady and unsteady flow conditions based on Tóth’s classical model were developed. The impacts of anisotropy ratio, hydraulic conductivity (K), and specific yield (μs) on the flow patterns were analyzed.
Niu, Hong, Liang, Xing, Ni, Sheng-nan, Wen, Zhang   +3 more
openaire   +2 more sources

Bismuth‐Based Photocatalysts for Water Remediation: Design Strategies, Mechanisms, and Challenges

Advanced Functional Materials, EarlyView.
This review highlights representative design strategies for bismuth‐based semiconductor photocatalysts in solar‐driven water purification. Emphasis is placed on electronic structure regulation, oxygen‐vacancy engineering, and interfacial coupling to enable efficient full‐spectrum light utilization, improved charge separation, and selective oxidation in
Shan Liu, Yi Zhao, Liming Cai, Simin Long, Jing Kang, Jingkai Lin, Jimin Shen, Zhonglin Chen, Shaobin Wang, Huayang Zhang   +9 more
wiley   +1 more source

Groundwater origin, flow regime and geochemical evolution in arid endorheic watersheds: a case study from the Qaidam Basin, northwestern China [PDF]

Hydrology and Earth System Sciences, 2018
Groundwater origin, flow and geochemical evolution in the Golmud River watershed of the Qaidam Basin was assessed using hydrogeochemical, isotopic and numerical approaches.
Y. Xiao, J. Shao, S. K. Frape, Y. Cui, X. Dang, X. Dang, S. Wang, S. Wang, Y. Ji   +8 more
doaj   +1 more source

Using helium-4, tritium, carbon-14 and other hydrogeochemical evidence to evaluate the groundwater age distribution: The case of the Neogene aquifer, Belgium

Journal of Hydrology X, 2022
Apparent groundwater age dating has been proven useful and robust in understanding water origin and mixing processes, particularly when multiple tracers are considered.
Alberto Casillas-Trasvina, Bart Rogiers, Koen Beerten, Joonas Pärn, Laurent Wouters, Kristine Walraevens   +5 more
doaj   +1 more source