Refine your results

Clear all filters
show more

Modeling highly heterogeneous aquifers: Lessons learned in the last 30 years from the MADE experiments and others

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?

Applications of percolation theory to porous media

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.

Toward Sustainable Groundwater in Agriculture

1 June 2012
T. Harter
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.

Climate Change Effects on Groundwater Resources

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.

Symposium on Planning and Design of Groundwater Data Programs

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.

Saline Water Symposium

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.

Modeling of Pore-Scale Processes

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.

Colloid Transport in Subsurface Environments

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.

Groundwater Economics and Policy

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.