Record Display for the EPA National Library Catalog

RECORD NUMBER: 181 OF 356

OLS Field Name OLS Field Data
Main Title Large-Scale Natural Gradient Tracer Test in Sand and Gravel, Cape Cod, Massachusetts 3, Hydraulic Conductivity Variability and Calculated Macrodispersivities.
Author Hess, K. M. ; Wolf, S. H. ; Celia, M. A. ;
CORP Author Geological Survey, Marlborough, MA. Water Resources Div. ;ENSR Consulting and Engineering, Acton, MA. ;Princeton Univ., NJ. Dept. of Civil Engineering.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Publisher c1992
Year Published 1992
Report Number EPA/600/J-92/359;
Stock Number PB93-107050
Additional Subjects Water pollution ; Subsurface investigations ; Environmental transport ; Tracer techniques ; Porous media ; Ground water ; Aquifer characteristics ; Dispersion ; Hydraulic conductivity ; Hydrology ; Path of pollutants ; Stochastic processes ; Study estimates ; Reprints ; Cape Cod(Massachusetts) ; Macrodispersion
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB93-107050 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/08/1993
Collation 22p
Abstract
Hydraulic conductivity (K) variability in a sand and gravel aquifer on Cape Cod, Massachusetts, was measured and subsequently used in stochastic transport theories to estimate macrodispersivities. Nearly 1500 K measurements were obtained by borehole flowmeter tests and permeameter analyses of cores. The geometric mean for the flowmeter tests (0.11 cm/s) is similar to that estimated from other field tests. The mean for the permeameter tests (0.035 cm/s) is significantly lower, possibly because of compaction of the cores. The variance for the flowmeter (0.24) is also greater than that for the permeameter (0.14). Geostatistical analyses applying negative exponential models with and without nuggets reveal similar spatial correlation structures for the two data sets. Estimated correlation scales range from 2.9 to 8 m in the horizontal and from 0.18 to 0.38 m in the vertical. Estimates of asymptotic longitudinal dispersivity (0.35-0.78 m) are similar in magnitude to that observed in the natural gradient tracer test (0.96 m) previously conducted at the site. (Copyright (c) 1992 by the American Geophysical Union.)