This special section deals with results of tracer experiments performed in highly
heterogeneous aquifers, particularly the well-documented experiments
performed at the Macrodispersion Experiment (MADE) site in Columbus,
Mississippi, USA. These results have challenged the research community
for almost three decades, generating extensive debate regarding
mechanisms controlling contaminant transport in highly heterogeneous
aquifers, modeling strategies for effectively representing these
mechanisms, and how to obtain the data required to use those models in a
predictive fashion. Recent work at MADE demonstrates its continuing
relevance for advancements in aquifer characterization and modeling
techniques. The wealth of data obtained over the years at MADE and
similar sites has provided a basis to develop and test different
conceptualizations and models of solute transport. This special section
focuses on the following two questions: What have we learned from
field-scale tracer experiments in highly heterogeneous aquifers and
where do we go from here? What modeling approaches are most effective
for simulating groundwater transport through highly heterogeneous media
and quantifying associated uncertainties, and what information is needed
to parameterize these models?
- Last updated:
- 20 April 2016
The papers in the special issue deal with the pore
space of natural porous media, such as soils, rocks, and fracture networks.
Undoubtedly, studying flow and transport in such complex systems requires new
approaches that can incorporate the effects of the geometry and topology – the
interconnectivity – of the pore space on the fluid flow and transport through
them. The classical approaches, based on continuum hydrodynamics, have failed
in many instances to provide accurate description of fluid flow and transport
phenomena in porous media. Among modern approaches, percolation theory provides
a powerful theoretical framework with a very wide range of applications to
natural porous media. The necessity to accurately model porous media has
encouraged researchers to invoke percolation theory to understand dominant
mechanisms at different scales. In particular, with the advent of new and
powerful computational techniques and algorithms over the past two decades,
intensive computations demanded by percolation theory have become more
practical, making percolation theory a more powerful and accessible tool.
- Hydrology, Hydrodynamic modeling, Transport, Soil moisture, Hydrogeophysics
- 1 June 2014
ources This special section of WRR will invite papers from the community
- Hydrology, Cryosphere and Earth Surface, Hydrology, Soil moisture, Modeling, Vadose zone, Infiltration, Groundwater hydrology, Evapotranspiration, Soils, Groundwater hydraulics, Streamflow
- 1 June 2012
This special issue defines and highlights the science, challenges, and potential policy solutions in agricultural groundwater resources management and groundwater quality protection at regional, national, and global scales. Groundwater is the lifeline for many rural and agricultural regions and their associated cultures and populations around the globe, and a cornerstone of global food production. Groundwater constitutes nearly half of the world's drinking water and much of the world's irrigation water supply. Population growth, overexploitation, salinization, nonpoint source pollution from agricultural activities (including animal farming, ranching, and forestry activities), impacts to surface water, and groundwater quality and quantity conflicts at the urban-rural interface have reached global dimensions and affect health and livelihoods around the planet.
- Hydrology, Cryosphere and Earth Surface, Hydrology, Irrigation, Vadose zone, Soils/pedology, Water quality, Groundwater quality, Agricultural systems, Modeling, Groundwater transport, Institutions
- 1 December 2010
This special section addresses the effects of climate change and variability on the quantity and quality of water in the vadose zone and groundwater. Globally, groundwater provides drinking water to more than 1.5 billion people and is critical in sustaining agriculture, industry, streams, lakes, wetlands, and many ecosystems. Thus, there is an urgent need for research to address the coupled effects from human activities and climate change and variability on groundwater resources. These papers represent innovative research on aquifers across the globe, and promote collaboration, education, and policy toward sustainable groundwater resources under future climate change/variability and coupled human responses.
- Hydrology, Cryosphere and Earth Surface, Hydrology, Climate impacts, Groundwater hydrology, Groundwater/surface water interaction, Modeling, Climate variability
- 1 February 1972
˜Planning and Design of Groundwater Data Programs™ was the subject of a symposium presented on December 8, 1970, during the National Fall Meeting of the American Geophysical Union in San Francisco, California.
- Hydrology, Cryosphere and Earth Surface
- 1 October 1970
˜Saline water”A valuable resource™ was the unusual concept that became the subject of a symposium presented on April 24, 1969, during the Fiftieth Annual Meeting of the American Geophysical Union in Washington, D.C. The symposium was sponsored by the Groundwater Committee, Section of Hydrology, American Geophysical Union.
- Hydrology, Cryosphere and Earth Surface
- 1 June 2008
In recent years pore-scale modeling of flow through porous media has gained much popularity. This can be attributed to advances in visualization of the actual pore space (and fluid distributions), to very high image resolution, and to the steady increase in computing power.
- Hydrology, Cryosphere and Earth Surface, Hydrology, Modeling, Groundwater transport, Microstructure, Transport properties, Permeability and porosity, Groundwater hydrology, Geochemical modeling, Hydrologic scaling
- 1 December 2006
The Water Resources Research special section on Colloid Transport in Subsurface Environments presents new knowledge that is critical to solving problems related to groundwater pollution by microbial pathogens and hazardous chemicals.
- Hydrology, Cryosphere and Earth Surface, Hydrology, Groundwater transport, Groundwater quality, Modeling, Groundwater hydrology, Colloids, Vadose zone, Instruments and techniques: monitoring, Geomicrobiology, Water quality
- 1 June 2004
Historically, surface water has been the main source of water for human consumption, as it was easy and cost-effective to access. However, increased rainfall shortages have resulted in increased use of groundwater to satisfy the ever increasing domestic, agricultural, and environmental/ecosystem preservation water demands.
- Science policy, Policy sciences