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Boise Hydrogeophysical Research Site (Bhrs): Objectives, Design, Initial Geostatistical ResultsNormal access

Authors: Warren Barrash, Tom Clemo and Michael D. Knoll
Event name: 12th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems
Session: Hydrology Forum - Geophysical Applications In Hydrologic Mapping
Publication date: 14 March 1999
Organisations: EEGS
Language: English
Info: Extended abstract, PDF ( 1.12Mb )

Summary:
The Boise Hydrogeophysical Research Site (BHRS) is a wellfield developed in a shallow,
coarse (cobble-and-sand), alluvial aquifer with the goal of developing cost-effective methods for
quantitatively characterizing the distribution of permeability in heterogeneous aquifers using
hydrologic and geophysical techniques. Responses to surface geophysical techniques (e.g., seismic,
radar, transient electromagnetics) will be calibrated against a highly characterized control volume
(the wellfield) with 3-D distributions of geologic, hydrologic, and geophysical properties determined
from extensive field measurements. Also, these data sets will be used to investigate relationships
between properties and to test petrophysical models. Well coring and construction methods, and the
well arrangement in the field, are designed to provide detailed control on lithology and to support
a variety of single-well, crosshole, and multiwell geophysical and hydrologic tests. Wells are
screened through the cobble-and-sand aquifer to a clay that underlies the BHRS at about 20 m depth.
In addition, the wellfield design optimizes well-pair distances and azimuths for determination of
short-range geostatistical structure. Initial geostatistical analysis of porosity data derived from
borehole geophysical logs indicates that the omnidirectional horizontal experimental variogram for
porosity (possible proxy for log permeability) is best fit with a nested periodic model structure.

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