Programs for the automatic processing and interpretation of Schlumberger sounding curves in QuickBASIC 4.0

Abstract

This open-file is composed of two parts: (a) The manual you are reading now (including examples and program listings which are given in the appendix), and (b) the disk with computer programs and test examples. Two computer programs are presented. The-first program (ATO.EXE) is based on a new method for the automatic interpretation of Schlumberger sounding curves obtained over horizontally stratified media (Zohdy, in press). The second program (PICKCONT.EXE) is a utility program that reads layering-files created by ATO.EXE and automatically interpolates the depths at preselected resistivity contour values. The resulting list of depths and resistivities facilitates the construction of contoured geoelectric cross sections. The programs were written in Microsoft QuickBASIC 4.O. Each program is composed of several modules. The complete listings of the source code for the various modules are given in appendices A and B. DISCLAIMER Although these computer programs have been tested extensively and every effort has been made to assure their accuracy and performance, no guarantees are expressed or implied. Furthermore, any use of trade names is-for descriptive purposes only and does not constitute endorsement by the U. S. Geological Survey. SYSTEM REQUIREMENTS This version of the program is-for IBM and compatible computers running under MS-DOS version 2.1 or higher. The computer must be equipped with an EGA (Enhanced Graphics Adaptor) or CGA (Color Graphics Adaptor) card and at least 256 K RAM (random access memory). A math co-processor chip is strongly recommended but is not required. If the proper graphics card is not available the program displays a message to that effect and then exits. An Epson or compatible printer is required to dump graphics and obtain a hard copy. DISK CONTENTS The accompanying disk contains the following: 1) ATO.EXE is the executable-form of the automatic interpretation program. 2) ATO.BAS is the main module of the automatic interpretation program written in QuickBASIC version 4.0. It requires two modules: ATOSUB.BAS, DRCT.BAS. (See appendix A for a complete listing of ATO.BAS, ATOSUB.BAS, and DRCT.BAS). 3) ATOSUB.BAS is a module containing several sub programs that are used with ATO.BAS. 4) DRCT.BAS is a second module containing several subprograms that are used with ATO.BAS. 5) ATO.MAK is a make utility created by QuickBASIC 4.0 to call the modules ATO.BAS, ATOSUB.BAS and DRCT.BAS. 6) EGADUMPL.COM is a public domain (PD) program-for dumping EGA graphics on an Epson (or compatible) printer. 7) PICKCONT.EXE is the executable-form of the pick contour program. 8) PICKCONT.BAS is the main module of the pick contour program written in QuickBASIC 4.0. It requires the-following modules: ATOSUB.BAS, CONTSUB.BAS, and DRCT.BAS. The-first and third modules are the same as those used with ATO.BAS. (see appendix B-for a complete listing of PICKCONT.BAS and CONTSUB.BAS). 9) CONTSUB.BAS is a module consisting of one subprogram that contains the preselected resistivity contour values. 10) PICKCONT.MAK is a make...

Hydro-Geophysical Investigations for the Purposes of Groundwater Artificial Recharge in Wadi Al-Butum Area, Jordan

“…These preliminary estimations were later used as a start model incorporating known geology and the available well data for a fast computer-assisted interpretation RESIST written by [18]. The results of interpretation were also compared with the result of purely automatic inversion programs without any assumptions of layering model in which the layering model is obtained directly from a digitized sounding curve [19]. In order to get a reasonable interpretation of geoelectrical measurements about the hydro-geological setting of the study area, a correlation between the available borehole log records in the vicinity of surveyed sites have been constructed (Figure 3) and used in deducing the Lithological-resistivity interpretation A Summary list of the interpreted geo-electrical models for VES soundings are presented in Table 2, while (Figures 4-6) show three examples of VES curves and their geophysical interpretation.…”

Deciphering transmissivity and hydraulic conductivity of the aquifer by vertical electrical sounding (VES) experiments in Northwest Bangladesh

“…The field measurements were made with a minimum and maximum current electrode spacing (AB) of 400 and 1,000 m, respectively. The collected VES data were interpreted using both the multi-layer forward (Zohdy and Bisdorf 1989) and Inverse (Cooper 2001) methods. The intentions of the use of two models were to increase the acceptability of interpretation and hence furnish accurate information on groundwater-bearing formation underneath.…”

Hydrology and water quality of the Beaver Dam Wash area, Washington County, Utah, Lincoln County, Nevada, and Mohave County, Arizona

“…Resistivity values as a function of depth are derived from the sounding curve with the aid of digitalcomputer programs (Zohdy, 1989;Zohdy and Bisdorf, 1989). Maximum electrode half-spacings for this survey ranged from 1,400 to 12,000 ft.…”