Estimation of Bojnourd aquifer hydraulic parameters using vertical electrical sounding (VES) data

Subject Areas :

Majid Altafi dadgar ¹ (دانشجوی کارشناسی ارشد هیدروژئولوژی،دانشکده علوم پایه، دانشگاه فردوسی، مشهد)
Hossein Mohammadzade ² (استادیار، گروه زمینشناسی،دانشکده علوم، دانشگاه فردوسی مشهد، مرکز تحقیقات آب، مشهد، ایران)
Rouh al amin Bahrami ³ (کارشناس، مجتمع عالی آموزشی و پرورشی صنعت آب و برق خراسان)

Received: 2016-09-07 Accepted : 2016-09-07 Published : 2012-09-22

Keywords: Hydraulic parameters, Estimation, Electrical sounding, Formation factor,

Abstract :

Assessment of aquifer hydraulic parameters (K, T) is very important in groundwater resource management andappropriate decision making. Analysis of pumping test data is the most common and useful method to evaluateaquifer hydraulic parameters. However, this method requires specific condition to do and it is a time consumingprocess with relatively high costs. Combination of geo electrical data with hydrogeological measurements willdecrease the costs somehow. In this study, 66 vertical electrical soundings (VES) with Schlumberger array wereperformed in Bojnourd plain and 26 of them were selected to determine the aquifer hydraulic parameters.The real resistance and the thickness of subsurface layers were determined by processing the field data using IPIsoftware and with respect to well logs. Using sounding data, which were performed in the vicinity of pumpingtest wells, and measured water resistivity data for these wells, the corrected transverse resistance and thentransmissivites were calculated, which has acceptable correlation with obtained transmissivites from pumpingtest analysis( T = 0.503 × R_T^′ - 143.6). In addition, the hydraulic conductivities were determined usingformation factor obtained from water quality data (K = 0.02 × F^3.292). Finaly, both iso-K and iso-T maps forBojnourd plain were illustrated using ArcGIS.