Navigation Links
Strange travels
Date:12/17/2008

Madison, WI, December 1, 2008 Transport phenomena in highly heterogeneous media can be dramatically different from those in homogeneous media and therefore are of great fundamental and practical interest. Anomalous transport occurs in semiconductor physics, plasma physics, astrophysics, biology, and other areas. It plays an especially important role in hydrogeology because it may govern the rate of migration and degree of dispersion of groundwater contaminants from hazardous waste sites.

A series of four articles in Special Section: Nonclassical Transport of the November 2008 issue of Vadose Zone Journal is devoted to transport phenomena in heterogeneous media in the context of geologic disposal of radioactive waste. Guest Editors Leonid Bolshov and Peter Kondratenko (Nuclear Safety Institute, Russian Academy of Sciences) and Karsten Pruess (Lawrence Berkeley National Lab.) assembled the articles, which are the results of joint investigations performed at the Nuclear Safety Institute of the Russian Academy of Sciences and Lawrence Berkeley National Laboratory in California. The work was supported by the USDOE.

The problems addressed in this research involve a broad range of space and time scales and were approached using modern methods of theoretical and computational physics, such as scaling analysis and diagrammatic techniques used before in critical phenomena theory. Special attention is paid to concentration tails. This issue is exceptionally important for the reliability assessments of radioactive waste disposal because, depending on the structure of the tails, concentrations at large distances from the source can differ by many orders of magnitude.

The first paper of this special section presents an overview of field and laboratory observations that demonstrate nonclassical flow and transport behavior in geologic media, with an emphasis on the fractal geometry of natural fracture networks and the presence of contaminant traps. The second paper is devoted to the analysis of diffusion in heterogeneous media with sharply contrasting properties; the authors show that as time progresses, three different transport regimes can be realized. In the third paper, it is shown that the solute transport regime is determined by a competition of two mechanisms: random advection through a fracture network and trapping caused by sharply contrasting properties of the medium. In the fourth paper, the authors develop a model of anomalous diffusion to simulate solute transport in highly heterogeneous media, and the new model is shown to result in reasonable agreement with experimental data on solute transport in highly heterogeneous media.


'/>"/>

Contact: Sara Uttech
suttech@soils.org
608-268-4948
Soil Science Society of America
Source:Eurekalert

Related biology news :

1. Strange molecule in the sky cleans acid rain, scientists discover
2. Parasites might spur evolution of strange amphibian breeding habits
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/20/2016)... A market that just keeps on growing. ... explosion in genomics knowledge. Learn all about it in ... of dynamic trends are pushing market growth and company ... pharmacogenomics - pathogen evolution - next generation sequencing - ... understanding of the role of genetic material in Disease ...
(Date:1/18/2016)... Jan. 18, 2016  Extenua Inc., a pioneering ... the use and access of ubiquitous on-premise and ... with American Cyber.  ... leading transformational C4ISR and Cyber initiatives in support ... latest proven technology solutions," said Steve Visconti ...
(Date:1/13/2016)... , January 13, 2016 ... the addition of the  "India Biometrics ... & Forecast (2015-2020)"  report to ... ) has announced the addition of ... Market - Estimation & Forecast (2015-2020)" ...
Breaking Biology News(10 mins):
(Date:2/9/2016)... ... 09, 2016 , ... With a presidential election in November and the future ... bring together over 500 top healthcare leaders for a night and day of debates ... by MBA students of the University of Pennsylvania’s Wharton School, will be held February ...
(Date:2/9/2016)... ... , ... Date and time: March 1, 2016, 5:30 p.m. ... Center of Bucks County, 3805 Old Easton Road, Doylestown, PA 18902. , The ... open house for participants to learn about a new Master of Biomedical Science ...
(Date:2/9/2016)... ... 09, 2016 , ... Clinovo , the cloud-based eClinical ... Data Capture (EDC) system ClinCaptureand its new Contract Research Organization (CRO) Partner Program ... in San Mateo, California on February 10th and 11th. Watch 2-min video ...
(Date:2/9/2016)... ... February 09, 2016 , ... The American Academy ... history, it is offering its 2016 AAT Member Certification Qualification Course for Technicians via ... for the webinar, which will include a detailed review of hardware, software, and camera ...
Breaking Biology Technology: