Lyell Collection
Quarterly Journal of Engineering Geology and Hydrogeology
Lyell Centre  |   Lyell Collection  |   Subscriptions   |   Geological Society  |   Email alerts  |   Online bookshop  |   Help

Keywords:
Author:
Advanced search>>
This Article
Right arrow Full Text (PDF)
Right arrow References
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow Request Permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Goldenberg, L. C.
Right arrow Articles by Magaritz, M.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation
Quarterly Journal of Engineering Geology and Hydrogeology; 1986; v. 19; issue.2; p. 183-190;
DOI: 10.1144/GSL.QJEG.1986.019.02.10
© 1986 Geological Society of London

Article

Fluctuating, non-homogeneous changes of hydraulic conductivity in porous media

L. C. Goldenberg

The Isotope Department, The Weizmann Institute of Science.

S. Mandel* & M. Magaritz

* The Hebrew University of Jerusalem, , Rehovot, Israel

Evidence of formation of entrapped saline bodies of water in a porous medium where fresh water displaces flowing sea water was observed in laboratory experiments, carried out on aquifer sands containing clay minerals. When sea water was flushed from these sands by fresh water, fluctuating changes of EC (electrical conductivity) appeared in the sample, and the hydraulic conductivity of the entire sample fluctuated before a lower value of hydraulic conductivity stabilized.

These results are explained by a sequence of mechanisms: (a) formation of small pockets of seawater surrounded bysemi-permeable membranes of deflocculated clay minerals; (b) bursting of the pockets by osmotic pressure and release of trapped sea water; and (c) deflocculation of clay minerals in the pockets formerly occupied by sea water.