Large‐scale natural gradient tracer test in sand and gravel, Cape Cod, Massachusetts: 2. Analysis of spatial moments for a nonreactive tracer

Stephen P. Garabedian, Dennis R. LeBlanc, Lynn W. Gelhar, Michael Anthony Celia

Research output: Contribution to journalArticle

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Abstract

A large‐scale natural gradient tracer test was conducted to examine the transport of reactive and nonreactive tracers in a sand and gravel aquifer on Cape Cod, Massachusetts. As part of this test the transport of bromide, a nonreactive tracer, was monitored for about 280 m and quantified using spatial moments. The calculated mass of bromide for each sampling date varied between 85% and 105% of the injected mass using an estimated porosity of 0.39, and the center of mass moved at a nearly constant horizontal velocity of 0.42 m per day. A nonlinear change in the bromide longitudinal variance was observed during the first 26 m of travel distance, but afterward the variance followed a linear trend, indicating the longitudinal dispersivity had reached a constant value of 0.96 m. The transverse dispersivities were much smaller; transverse horizontal dispersivity was 1.8 cm, and transverse vertical dispersivity was about 1.5 mm.

Original languageEnglish (US)
Pages (from-to)911-924
Number of pages14
JournalWater Resources Research
Volume27
Issue number5
DOIs
StatePublished - Jan 1 1991

All Science Journal Classification (ASJC) codes

  • Water Science and Technology

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