Integrating geophysical and hydrochemical borehole-log measurements to characterize the Chalk aquifer

Citation

Material Information

Title:
Integrating geophysical and hydrochemical borehole-log measurements to characterize the Chalk aquifer
Series Title:
Hydrogeology Journal
Creator:
Schürch, Marc
Buckley, David
Publisher:
Springer Nature
Publication Date:
Language:
English/French/Spanish

Subjects

Subjects / Keywords:
Borehole Logging ( local )
Chalk ( local )
Fractured Rock ( local )
Hydraulic Properties Of Aquifers ( local )
United Kingdom ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
Geophysical and hydrochemical borehole-logging techniques were integrated to characterize hydraulic and hydrogeochemical properties of the Chalk aquifer at boreholes in Berkshire, UK. The down-hole measurements were made to locate fissures in the chalk, their spatial extent between boreholes, and to determine the groundwater chemical quality of the water-bearing layers. The geophysical borehole logging methods used were caliper, focused resistivity, induction resistivity, gamma ray, fluid temperature, fluid electrical conductivity, impeller and heat-pulse flowmeter, together with borehole wall optical-imaging. A multiparameter data transmitter was used to measure groundwater temperature, electrical conductivity, dissolved oxygen, pH, and redox potential of the borehole fluid down-hole. High permeability developed at the Chalk Rock by groundwater circulation provides the major flow horizon at the Banterwick Barn study site and represents a conduit system that serves as an effective local hydraulic connection between the boreholes. The Chalk Rock includes several lithified solution-ridden layers, hardgrounds, which imply a gap in sedimentation possibly representing an unconformity. Lower groundwater temperature, high dissolved-oxygen content, and flowmeter evidence of preferential groundwater flow in the Chalk Rock indicated rapid groundwater circulation along this horizon. By repeating the logging at different times of the year under changing hydraulic conditions, other water-inflow horizons within the Chalk aquifer were recognized.
Original Version:
Hydrogeology Journal, Vol. 10, no. 6 (2002-12-01).

Record Information

Source Institution:
University of South Florida Library
Holding Location:
University of South Florida
Rights Management:
This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.

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University of South Florida
Karst Information Portal

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