@Article{FreirePerePadi:2020:CaStNo,
               author = "Freire, Paulo Edmundo da F. and Pereira, Sueli Yoshinaga and 
                         Padilha, Antonio Lopes",
          affiliation = "{Paiol Engenharia} and {Universidade Estadual de Campinas 
                         (UNICAMP)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)}",
                title = "Adjustment of a crustal geoelectric model from Commissioning data 
                         of HVDC ground electrodes: A case study from the Northeastern 
                         Paran{\'a} Basin, Brazil",
              journal = "Journal of Applied Geophysics",
                 year = "2020",
               volume = "182",
                pages = "e104186",
                month = "nov.",
             keywords = "Static shift, Geoelectric modeling, HVDC ground electrode, HVDC 
                         transmission system.",
             abstract = "Small-scale near-surface galvanic scatters are known to be a bane 
                         when using natural field EM data to get quantitative information 
                         about the subsurface resistivity structure. Specifically, on 
                         magnetotelluric measurements, the effect of local surficial 
                         inhomogeneities is almost inevitable and produces a static shift 
                         in the measured apparent resistivities over the whole range of 
                         sampled frequencies. We present here the methodology used to 
                         account for static shift effects and make a correct interpretation 
                         of the resistivity distribution in a region beneath the 
                         northeastern part of the volcanic-covered Paran{\'a} basin, SE 
                         Brazil. Within this region are located the ground electrodes of 
                         the Rio Madeira HVDC transmission system (Bipoles I and II). The 
                         available data includes geophysical soundings made for the 
                         electrodes site selection before their installation and data 
                         acquired in the subsequent commissioning measurements after their 
                         construction (electrode resistance, soil surface potentials and 
                         pipe-to-soil potentials). Iterative calculations for the 
                         simultaneous adjustment of the measured electrode resistance and 
                         the local geoelectric model were developed, based on the 
                         commissioning data of the electrode. The accuracy of the adjusted 
                         geoelectric model was confirmed by the excellent fit obtained for 
                         the measured and calculated pipe-to-soil potentials at Gasbol, the 
                         Bolivia-Brazil gas pipeline located 26 km away from the 
                         electrode.",
                  doi = "10.1016/j.jappgeo.2020.104186",
                  url = "http://dx.doi.org/10.1016/j.jappgeo.2020.104186",
                 issn = "0926-9851",
             language = "en",
           targetfile = "freire_adjustment.pdf",
        urlaccessdate = "27 abr. 2024"
}