ИСТИНА

A new highway will pass close to the Mshentsy village in Bologovsky district, Tver region. The “Mshentsy Springs” located in this village, have important social and cultural meaning for the local community. Pilgrims, history experts and tourists are frequent visitors to the springs and an associated church. New highway construction may pollute the aquifer system of the spring and nearby territories. The geological structure of the area consists of two parts: the upper part presented by loose moraine sediments, the lower part presented by carbonate rocks subject to karst processes. Karstification may trigger a hazardous event and complicate highway construction and road usage. If the moraine aquifer system is hydraulically connected with the aquifer system of the carbonates, then water pollution from the upper layer may infiltrate to the underlying carbonate rocks. To get information about the geologic structure of a cross-section that might show karst and water flow zones,geoelectric surveys were performed (specifically, electrical resistivity tomography (ERT), self potential survey, water electrical conductivity and temperature measurements). With the help of petrophysical resistivity modeling and taking into account water electrical conductivity and temperature measurements we identified resistivity intervals which are typical for sand lenses in the upper part of the cross-section, fractured and non-fractured carbonate rocks and we also calculated hydraulic conductivity values.