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" ", -. SOPAC Water Resources Unit \ OFFSET WENNER RESISTIVITY SURVEY GUIDELINES David Scott September 1999 SOPAC Miscellaneous Report 354

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Page 1: SOPAC Water Resources Unit · SOPAC Water Resources Unit \ OFFSET WENNER RESISTIVITY SURVEY GUIDELINES David Scott September 1999 SOPAC Miscellaneous Report 354

"", -.

SOPAC Water Resources Unit\

OFFSET WENNER RESISTIVITY SURVEY GUIDELINES

David Scott

September 1999 SOPAC Miscellaneous Report 354

Page 2: SOPAC Water Resources Unit · SOPAC Water Resources Unit \ OFFSET WENNER RESISTIVITY SURVEY GUIDELINES David Scott September 1999 SOPAC Miscellaneous Report 354

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Table of Contents

PRINCIPLES 3

PROCEDURES 6

INTERPRETATION 6

FIELD PROCEDURES 7

PREPARA TION 7

LOCA TION 8

SETTING UP 9Cable connecti.ons """'."""""""'."".""'.'."."""'.'."" 9

Taking Measurements 9

Field Calculations... 10

REFERENCES 11

APPENDIX 1: ABEM TERRAMETER SAS SYSTEM 12

APPENDIX 2: OFFSET WENNER DATA FORM 15

APPENDIX 3 -SAMPLE RESULTS 16

APPENDIX 4 RESISTIVITY MODELLING PACKAGE 17

Page 3: SOPAC Water Resources Unit · SOPAC Water Resources Unit \ OFFSET WENNER RESISTIVITY SURVEY GUIDELINES David Scott September 1999 SOPAC Miscellaneous Report 354

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Page 9: SOPAC Water Resources Unit · SOPAC Water Resources Unit \ OFFSET WENNER RESISTIVITY SURVEY GUIDELINES David Scott September 1999 SOPAC Miscellaneous Report 354

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Page 15: SOPAC Water Resources Unit · SOPAC Water Resources Unit \ OFFSET WENNER RESISTIVITY SURVEY GUIDELINES David Scott September 1999 SOPAC Miscellaneous Report 354

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Page 16: SOPAC Water Resources Unit · SOPAC Water Resources Unit \ OFFSET WENNER RESISTIVITY SURVEY GUIDELINES David Scott September 1999 SOPAC Miscellaneous Report 354

APPENDIX 3 -SAMPLE RESULTS

SiE: Port Vila school playing field ReI No: Test \'\/eaf1er:

Observers: Chris, Morris, Da..;d et al. Bearing Topography:

DaE: 21/08/98 Soil: Geology:

SETTING OBSERVED MEASUREMENTS ERRORS SPACING ~NNER

(n) RA RC RD1 RD2 RB CBS OFFSET LATERAL (neb"es) RESISTIVITY

1 9.28 8.89 6.52 6.62 0.43 -0.43 -1.52 05 20.64

2 6.33 6.05 4.33 4.52 0.463 -2.85 -4.29 -3.99 1.0 2780

1.5 38.073 5.46 5.04 3.49 3.71 0459 -0.71 -6.11 14.51 2.0 45.24

3.0 65.284 498 4.69 3.19 3.46 0332 -0.84 -8.12 14.46 4.0 8357

6.0 113.225 4.45 4.14 2.82 3.05 0 -0.22 -7.84 8.33 8.0 14753

12.0 200.676 3.27 3.1 2.42 24 o. -6.34 0.83 0.39 16.0 242.28

24.0 300.157 2.02 1832 1.48 1.453 0 -474 1.84 19.29 320 29486

48.08 N/A N/A N/A 640

96.09 N/A N/A N/A 128.0

RMS Err 3.21 5.20 11.20 192.0

256.0

Wenner Sounding Curve

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Page 17: SOPAC Water Resources Unit · SOPAC Water Resources Unit \ OFFSET WENNER RESISTIVITY SURVEY GUIDELINES David Scott September 1999 SOPAC Miscellaneous Report 354

.,

RESISTIVITY MODELLING PACKAGE

Intuitive Point and Click Interface print preview facility and then sent to any

Easy aspect of the interface has been Windows-supported output device in full

designed to make RINVERT for Windows colour or black and white. Intelligent

easy to use. You can access all menu default settings combined with intuitive

options and dialog boxes via the mouse on-screen editing make customising your

or keyboard, so that you can use the reports a snap. Creating publication

interface that you feel comfortable with. quality reports has never been easier.

RINVERT for Windows makes your first

chart displayed by simply selecting a data :;oc ';\ cfile and clicking on OK. It's easy! II QiAPTER1-1~ RIN'.'rRTI"W.-,

a QiAPTER 2 IriIoducng RI~VERT fa w~,Intelligent default settings allow you to a QiAPTER3 GettngStO'toda,,",k~

analyse complex data sets without having ~ ~ :.~ ~::::::%"'RINYERTh h ft If 00 43 N~~Mett.,.; ednRI~~T

to go t roug menu a er menu. you [!) 44 F..-dModelr'Q" 00 45 I~o ModeIr'Q

have used Microsoft Windows then you ~ 46 EOP*",o~a QiAPTER 5 TlAori.l

are familiar with a lot of the commands a QiAPTERf Data~"odeIF.,II CHAPTER 7 E~hode Anlll TWJO$

used in RINVERT for Windows. If not a QiAPTER8 For_d"~, a CHAPTER 9 Invel'o ModekIg

. th t ' t d ' th f a QiAPTER1C E_~oA~",now IS e Ime 0 Iscover e power 0 II QiAPTER11 Cro"F9~"',",W1gCc"ornwdRepOI"M ' ft W. d t th 'th II GLDSSARY

Icroso In ows oge er WI ~~~-="c.:,,~"::'i.~!;t'?li;c', ~"~.~;.,,,Cf-

RINVERT for Windows.

:~~c1'-cct~~ ":C7;~ ~~=E;-,~:';:::i:?f'C-~;::'~;",~~~ Comprehensive and Context Sensitive

oj .:="=- Help SystemY '.' ..RINVERT for Windows comes together

..[j]l]:E ;:r with a Windows help syst~m, providing

M -' you with fully comprehensive, contextj ;~ g~ ~ I g I 01..7 ---7,.- sensitive hel p on eve ry menu item or: ::: ;:: ~, :: i :.L " f E ~~ s~!iE' .j: .dialog box. With RINVERT's

-'=~;::"';:"':;::::;-~" !:.. ;.-:..::-~ .sophisticated help system, your search is

-':--'::'=.;::"';:"':;:'-::' only a keystroke away.

project and illustration details, as well as .1 ~,?~~;;i~~~1:~1;t~l~)C~1;1 ..,t~'.~,,:.;,;~1J,',,*;;::~c

free-form comments. This information I~ ;':~::';1~;~;;~'!:;J~J~~1"j ,;,:';.';:'.;c;.;t~'i?t.,Ji;;;'ff;",~may be printed out with tables and .1 '-:":~~i;:;c""i,~(i.i~;:~

equivalence analysis -in report ready

format. The report may be checked by a~

Page 18: SOPAC Water Resources Unit · SOPAC Water Resources Unit \ OFFSET WENNER RESISTIVITY SURVEY GUIDELINES David Scott September 1999 SOPAC Miscellaneous Report 354

~

Forward Modelling (Simulation) Equivalence AnalysisSelecting FORWARD allows RINVERT RINVERT for Windows provides a unique

for Windows to generate the sounding facility for equivalence analysis which

curve for your earth model. RINVERT for permits the user to control the range of

Windows also allows the user to change equivalence by nominating the accuracy

the model repeatedly until the sounding of the field data. The degree of

curve matches visually with the field data. equivalence is indicated by meaningful

~: "; descriptors: "unique", "minor", "severe",~() $ic " "extreme". RINVERT for Windows also

R.slstj, ohm-m I Provides an impressive 3D visual dis play10' R DATA (]\ART

,..Rs ",y."" of equivalent models.

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f'lP :'1:-1'0 ;~~;:i

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Inverse Modelling (Automatic ~.,,-co

Interpretation) X:';t..

Selecting INVERSE allows RINVERT for i~;~o=

Windows to find the best models which :~

fits your sounding data. RINVERT forWindows automatically modifies an initial RINVERT for Windows -A Proven

estimate of a layered earth model until Solution

the simulated and observed sounding RINVERT for Windows supersedesdata agree closely. RINVERT for RINVERT for DOS, adding even more

Windows also displays the sounding features at an unbelievable price. It is a

curve and goodness-of-fit for each natural evolution of an algorithm which

iteration. has been applied successfully to

thousands of resistivity soundingsworldwide over the last 20 years. Can

you afford to be without it? Save time and

increase productivity -RINVERT for

Windows provides fast, accurate 'user

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screen model display.

f.~(Australian Dollar)Single User -AUD$695 plus freight &

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licence available at reduced cost.