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Groundwater Geophysics in Hard Rock




ISBN 9780415664639
Published October 19, 2015 by CRC Press
366 Pages

 
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Book Description

In hard rock terrain, shallow water wells generally have a poor to moderate yield. Sinking wells deeply to tap yielding fracture zones often backfires, because the borehole may miss the saturated fracture zones at depths. A wrong approach to groundwater exploration in hard rock has therefore often led to unnecessary recurring expenditures and waste of time, something that could have been avoided by a systematic and proper geophysical approach. The combination of various geophysical techniques with environmental conditions is essential to constrain the interpretation and reduce uncertainties in this respect. This book presents the approach to groundwater exploration in hard rocks, various geophysical techniques and combinations to be used, interpretation of data with case studies and drilling results and the preparation of different utility maps.

Table of Contents

1 Groundwater issues in hard rock & geophysics
1.1 Introduction
1.2 Trends in groundwater utilization
1.3 Necessity of managed aquifer recharge
1.4 Groundwater quality issues
1.5 Problems in groundwater development
1.6 Need for systematic investigation
1.7 Scope and essentiality of geophysical input
1.8 Geophysical deliverables
1.9 Prerequisite technical field-guidance
1.10 Interdisciplinary convergence
1.11 Cost-effectiveness vs technological development

2 Introduction to the hydrogeology of hard rock
2.1 Introduction
2.2 Weathered zone and fractures
2.3 Groundwater occurrences
2.3.1 Weathered zone aquifers in granitic terrain
2.3.2 Fractured zone aquifers in granitic terrain
2.3.2.1 Deeper fractured aquifers
2.3.3 Aquifers in metasediments
2.3.4 Aquifers in quartz reefs and dykes
2.3.5 Volcanic rock aquifers
2.4 Groundwater development
2.5 Groundwater quality

3 Introduction to geophysical investigations in hard rock
3.1 Introduction
3.2 Geophysical methods and physical property measurements
3.3 Applications of geophysical methods
3.3.1 Airborne geophysics
3.3.2 Surface geophysics
3.3.3 Borehole geophysics
3.4 Integration of methods

4 Planning of geophysical surveys
4.1 Introduction
4.2 Modeling geophysical response
4.3 Types of survey and coverage
4.4 Selection of method and equipment
4.5 Planning for field survey
4.5.1 General considerations for equipment
4.5.2 Access to the area
4.5.3 Area details and compilation of data
4.5.4 Survey parameter design
4.5.5 Surveying work for profile layout
4.6 Geophysical team size and responsibilities
4.7 Survey cost and time
4.8 Safety and precautions in field operations
4.9 Quality control
4.10 Deliverables

5 The magnetic method
5.1 Introduction
5.2 Basics
5.3 Instrument
5.4 Field procedures
5.4.1 Total magnetic field intensity measurement
5.4.1.1 Correction of data
5.4.2 Magnetic susceptibility measurement during field survey
5.5 Processing of data
5.5.1 Regional-residual anomaly separation
5.5.2 Reduction to pole
5.6 Interpretation
5.6.1 Estimation of depth to magnetic source
5.7 Identification of fractured zone
5.8 Aeromagnetics
5.8.1 Case studies

6 The electrical resistivity method
6.1 Introduction
6.2 Ranges of electrical resistivity in hard rock
6.3 Basics
6.4 Vertical electrical sounding
6.4.1 Electrode arrays
6.4.2 Depth of investigation
6.5 Resistivity profiling
6.5.1 Gradient array resistivity profiling
6.6 Resistivity imaging
6.7 Electrode arrays for investigating fracture/structure-induced anisotropy
6.8 Site selection in hard rock areas
6.9 Instrument and field accessories
6.10 Field layout, operation and data acquisition
6.10.1 Checks in field operations
6.11 Processing of data
6.12 Interpretation
6.12.1 Manual interpretation of vertical electrical sounding curve for layered-earth
6.12.1.1 Curve matching technique
6.12.1.2 Inverse slope method
6.12.2 Interpretation of sounding curve for bedrock depth
6.12.3 Interpretation of sounding curve for fracture detection
6.12.4 Detecting fractures from sounding curve by empirical methods
6.12.4.1 Curve-break method
6.12.4.2 Factor method
6.12.5 Computer based interpretations of sounding curves
6.12.6 Equivalence in layer parameters
6.12.7 Poor resolution or suppression of a geoelectrical layer
6.12.8 Depth-wise transition in resistivity
6.12.9 Effect of top soil conductivity

7 The self potential method
7.1 Introduction
7.2 Basics
7.3 Instrument
7.4 Field procedures
7.5 Processing of data
7.6 Interpretation
7.7 Case studies on effect of well pumping on SP
7.7.1 Changes in SP after 24 hrs pumping
7.7.2 Changes in SP after 1 hr pumping
7.7.3 Groundwater flow through cavernous limestone

8 The mise-a-la-masse method
8.1 Introduction
8.2 Basics
8.3 Instrument
8.4 Field procedures
8.5 Processing of data
8.6 Interpretation
8.7 Case studies

9 The frequency domain electromagnetic method
9.1 Introduction
9.2 Basics
9.3 Instrument
9.4 Field procedures
9.5 Processing of data
9.6 Interpretation
9.7 Delineation of saturated fractured zones
9.7.1 Case study from metasediments
9.7.2 Case studies from granitic terrain

10 The very low frequency electromagnetic method
10.1 Introduction
10.2 Basics
10.3 Instrument
10.4 Field procedures
10.5 Processing of data
10.6 Interpretation
10.7 Case studies
10.7.1 Granitic terrain
10.7.2 Metasediments
10.7.3 Basic dyke and quartz reef

11 The time domain electromagnetic method
11.1 Introduction
11.2 Basics
11.3 Instrument
11.4 Field procedures
11.5 Processing of data
11.6 Interpretation
11.6.1 Equivalence in electromagnetic sounding
11.6.2 Detectability and depth of investigation
11.7 Delineation of fractured zones in hard rock
11.8 Airborne electromagnetic surveys
11.8.1 Airborne TEM survey for groundwater in hard rock

12 The borehole geophysical logging methods
12.1 Introduction
12.2 Spontaneous potential
12.3 Single point resistance
12.4 Resistivity
12.5 Electromagnetic induction
12.6 Fluid conductivity
12.7 Temperature
12.8 Natural gamma radioactivity
12.9 Gamma-gamma (density)
12.10 Neutron
12.11 Caliper
12.12 Flowmeter
12.13 Acoustic
12.14 Borehole televiewer
12.15 Borehole radar
12.16 Nuclear magnetic resonance

13 Integrated geophysical survey
13.1 Introduction
13.2 Mapping of lineaments from satellite imagery
13.3 Airborne geophysical surveys
13.4 Geological and borehole information
13.5 Selected surface geophysical methods and techniques for integration
13.5.1 Seismic surveys
13.5.2 Passive seismic
13.5.3 Ground penetrating radar
13.5.4 Nuclear magnetic resonance measurement
13.5.5 Radon gas measurement
13.6 Integration of electrical and electromagnetic methods
13.7 Procedure for integrated field surveys
13.8 Case studies
13.9 Research studies and field experiments

14 Geophysical methods in management of aquifer recharge & groundwater contamination study
14.1 Introduction
14.2 Managed aquifer recharge
14.2.1 Geophysical investigations
14.2.1.1 Some managed aquifer recharge structures
14.2.1.2 Unsaturated zone characterization and monitoring recharge conditions
14.3 Groundwater contamination study
14.3.1 Geophysical investigations
14.3.1.1 Monitoring groundwater contamination

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Author(s)

Biography

Dr. Prabhat C. Chandra, a professional groundwater geophysicist, was born in Varanasi, India in 1950. He received B.Sc. and M.Sc degrees in Geology and Geophysics from Banaras Hindu University (BHU) in 1970 and 1972 and was awarded the N.L. Sharma Gold Medal in Geology and first rank in Geophysics. Soon after, Dr. Chandra started his career as a groundwater geophysicist at the CSIR-National Geophysical Research Institute, Hyderabad (NGRI) India and in 1978 joined the Central Ground Water Board (CGWB), Govt. of India. His doctoral thesis was on groundwater geophysics. He superannuated in December 2010 at the age of 60 as Director, CGWB.

During his 38 year professional career he has had ample opportunity to work on a variety of groundwater issues in almost all the hydrogeological terrains of India including hard rock, coastal tracts, limestone, basalts, alluvium, desert, islands and hilly tracts. In view of the scarcity of groundwater in hard rock he took up the challenging geophysical investigations of delineating fracture zones in hard rocks which cover two thirds of the country. There are several papers and reports to his credit.

He was trained in groundwater management through an Indo-British Fellowship from the UK. He attended World Water Week, Sweden and visited the Hydro Geophysics Group (HGG), Aarhus University, Denmark for presentations on groundwater geophysics. At Allahabad University, Central University, Patna and the Indian School of Mines, Dhanbad, he taught hydrogeology and groundwater geophysics. After superannuation he worked as a consultant to The World Bank, New Delhi and as an expert to CSIR-NGRI along with experts from the U.S. Geological Survey (USGS) and HGG, Aarhus University, Denmark for aquifer mapping in pilot projects through heliborne geophysical surveys and as advisor to WAPCOS Ltd. Govt. of India for aquifer mapping of the National Capital Region through surface and borehole geophysical surveys. 

The book ‘Groundwater Geophysics in Hard Rock’ is based on his vast experience in delineating the fracture zones in hard rocks, subsurface characterization and locating high yielding well sites.

Reviews

Geophysics is about physics of the earth, its physical property variations and their response to induced perturbation giving a comprehensive insight into sub-surface hydrogeological conditions. I have rarely come across such a masterly treatment of the subject, so comprehensive, and penned in such a lucid language and student friendly style as in the book under review. The author P.C. Chandra, an eminent hydro-geophysicist, formerly Regional Director of Central Ground Water Board, has spent a major part of his career in the hard rock terrains of peninsular states and eastern India, namely the basement complex and Deccan traps. He has distilled his knowledge and experience gained in his more than three decades of field surveys in the pages of this book and enriched it with his priceless case studies. There are very few professionals in the country like Chandra who after superannuation from government service return to the academia prompted by sheer love of science and an urge to transmit the acquired knowledge to the young scientists, and ignite their inquisitive minds. 

Almost all aspects of hard rock hydro-geophysics from the perspectives of this subcontinent have been succinctly dealt with in the book. The author has also not forgotten to add a brief  section on future scope of research in this field. Neat illustrations, valuable data tables, reference lists with each chapter for future study and error free quality printing mark the book as a ‘must read’ Manual for all, – graduate and post-graduate students, research scholars, teachers, and practicing groundwater geologists and geophysicists alike. I have no doubt that it will be a treasured keep in the Reference Libraries of Universities and Institutes teaching and practicing hydrogeology and geophysics. Truly the book is a masterpiece, a stellar contribution of P.C. Chandra to geoscience education. It is a tribute to his four decade long dedicated pursuit of geophysics.

Subhajyoti Das, Geological Society of India vol. 88 (August 2016)

 

"This work is one of several recently published textbooks on the important topic of geophysics for groundwater studies. As the title states, this particular text focuses almost exclusively on hard rock aquifers, which include the weathered zone, and mostly excludes soft rock terrains typified by carbonates and sulfates. Surface geophysical methods emphasized in this textbook include individual chapters that address the magnetic, resistivity, self-potential, mise-a-la-masse, and electromagnetic techniques. Borehole geophysical methods are relegated to one chapter that covers typical methods, such as spontaneous potential, gamma, caliper, and neutron techniques. An important aspect of the textbook is the discussion on planning geophysical investigations; the reviewer believes this should have further emphasized the importance of geological studies prior to initiating a geophysical investigation (to better target the geophysical investigation and the integration of a geophysical survey) because application of a single technique is rarely adequate. The limited use of mathematics, the basic discussion of geophysical methods, and the very brief case history discussions make for a reasonably good introductory text on the importance of geophysical investigations for groundwater investigations in hard rock terrains.

Summing Up: Recommended. Lower-division undergraduates through faculty; professionals"

M. S. Field, U.S. Environmental Protection Agency, in 'Choice', January 2017 issue