Line-Source Multi-Tracer Test for Assessing High Groundwater Velocity

Einat Magal, Noam Weisbrod, Alexander Yakirevich, Daniel Kurtzman, Yoseph Yechieli

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Segmented line-source multi-tracer injection is suggested as an effective method for assessing groundwater velocities and flow directions in subsurfaces characterized by high water flux. Modifying the common techniques of injecting a tracer into a well became necessary after point-source natural and forced gradient tracer tests ended with no reliable information on the local groundwater flow. The tracer's line-source increases the likelihood of success of the test and could provide additional information regarding the lateral heterogeneity of the aquifer.In a field experiment conducted in the northwestern part on the Dead Sea coast, tracers were injected into an 8-m-long line injection system perpendicular to the assumed flow direction. The injection system was divided into four separate segments with four different tracers. An array of five boreholes located within a 10 × 10 m area downstream was used for monitoring the tracers' transport. Two dye tracers (uranine and Na naphthionate) were injected in a long pulse of several hours into two of the injection pipe segments. Two other tracers (Rhenium oxide and Gd-DTPA) were instantaneously injected into the other two segments. The tracers were detected 0.7 to 2.3 h after injection in four of the five observation wells, located 2.3 to 10 m away from the injection system.The groundwater velocity was determined to be ~80 to 170 m/d, based on the recoveries of the tracers. The groundwater flow direction was derived based on the arrival of the tracers and was found to be quite consistent with the apparent direction of the hydraulic gradient.

Original languageEnglish
Pages (from-to)892-897
Number of pages6
JournalGround Water
Issue number6
StatePublished - 1 Nov 2010
Externally publishedYes

ASJC Scopus subject areas

  • Water Science and Technology
  • Computers in Earth Sciences


Dive into the research topics of 'Line-Source Multi-Tracer Test for Assessing High Groundwater Velocity'. Together they form a unique fingerprint.

Cite this