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:3/22/2017)... -- Vigilant Solutions , a vehicle location and ... today the appointment of retired FBI special agent ... development. Mr. Sheridan brings more than 21 ... on the aviation transportation sector, to his new role ... served as the Aviation Liaison Agent Coordinator (ALAC) in ...
(Date:3/16/2017)... 2017 CeBIT 2017 - Against identity fraud with DERMALOG solutions "Made ... ... Used combined in one project, multi-biometric solutions provide a crucial contribution against identity ... Used combined in one project, multi-biometric ... ...
(Date:3/9/2017)... and MOUNTAIN VIEW, Calif. ... "Eating Well Made Simple," and 23andMe , the ... guide better food choices.  Zipongo can now provide customers ... food preferences, health goals and biometrics, but also genetic ... food choices. Zipongo,s personalized food decision support ...
Breaking Biology News(10 mins):
(Date:4/19/2017)... Indiana (PRWEB) , ... April 18, 2017 , ... Alisa ... 2017 Distinguished Alumni Awards from the Purdue College of Pharmacy in Lafayette, Indiana. ... Purdue Pharmacy Program for achievements in their careers and other scientific endeavors. , ...
(Date:4/19/2017)... , ... April 19, 2017 , ... ... Series A-1 financing round. This event adds to several other early achievements at ... Executive and Scientific Teams. , ThermaGenix will use proceeds from the ...
(Date:4/19/2017)... and PUNE, India , April 19, 2017 ... Microfiltration Market: Global Opportunity Analysis and Industry Forecast, 2014-2022 ," the global market ... million by 2022, registering a CAGR of 9.6% from 2016 to 2022. ... ... ...
(Date:4/19/2017)... FRANCISCO, Calif. , April 19, 2017 /PRNewswire/ ... VCYT ) today announced that it will report ... of market on Wednesday, May 3, 2017. Following the ... webcast at 4:30 p.m. Eastern Time to discuss the company,s ... live webcast and subsequent replay may be accessed ...
Breaking Biology Technology: