Resistivitetsmetoden för grundvattenprospektering

• Main Author: Barrehayle, Abdiyare
• Format: Others
• Language: Swedish
• Published: Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser 2019
• Subjects: Natural Sciences; Naturvetenskap
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-74018

This work presents a case study for application of the electrical resistivity tomography (ERT) methodto investigate presence of groundwater along six profiles in Småland, an area in southern Sweden.The ERT method relies on the fact that different materials indicate different abilities to transmitelectric current through them. Water is a strong electrical conductor, which results in low resistivityvalues in water-saturated geological formations. General electrode array has been used formeasuring resistivity variation over 6 profiles with length of 160-200 m each. The study area isstrongly dominated by the unfractured igneous rocks which are associated with limited watercontent. A computer-based program Res2dinv is used to invert the apparent resistivity data todeduce the resistivity models which is then used for interpretations. Result from seismic refractiondata over the same study area was used to constrain the resistivity models along each profile. Theresult from Profiles 1,4,5 and 6 demonstrates presence of structures which contain groundwater.