Application of geoelectrical profiling in the delineation of shallow periglacial structureson the Drohiczyn Plateau

The pa per de scribes the re sults of geoelectrical sound ing ap pli ca tion for the de lin ea tion of periglacial struc tures in Wierzchuca Nagórna within the Drohiczyn Pla teau (east ern Po land). The method re cords the vari a tion of ap par ent re - sis tiv ity of de pos its along a se lected hor i zon tal di rec tion. The sur vey uti lizes a dis tinct geoelectrical con trast be tween gla cial till and struc tures com posed of sand that have been rec og nized ear lier in the gravel pit wall. The stud ies have been con ducted in di rect hin ter land of the gravel pit. Rect an gu lar and con cen tric ar rays were ap plied in the sur vey. The re sults have been pre sented as graphs and re sis tance dis tri bu tion maps. The ob tained geo log i cal im age is not complete, al though it shows an ori ented course of the larg est lin ea ments and traces of a net work with a small mesh size (1.5–2 m). The rec og nized pat tern of struc tures points to harsh cli ma tic con di tions dur ing their for ma tion. Gen eral ori - en ta tion of the struc tures cor re sponds to the ba sic el e ments of the con tem po rary land scape in the area (slope, val ley axes). Geoelectrical sound ing us ing the rect an gu lar ar ray gave better re sults than in the con cen tric ar ray, whereas in - tro duc tion of brine into the sys tem did not en hance the res o lu tion of the read ings. The pre sented re sis tance dis tri bu tion maps with a char ac ter is tic rhythm of vari a tions may serve as a bench mark for rec og niz ing periglacial struc tures in areas with out ex po sures.