MODEL PRZEPŁYWU WÓD PODZIEMNYCH W REJONIE TUNELU POD MARTWĄ WISŁĄ

Abstract

GROUNDWATER FLOW MODEL OF DEAD VISTULA RIVER TUNNELAbstract. Model research were made to determine the groundwater imact on the hollow tunnel in Pleistocene-Holocene aquifer. On the other hand it was important to determine the effect of the tunnel on the watertable level, flow conditions and resources of the Quaternary aquifer in the vicinity of the investment. The model studies area was 14.8 km2. Schematization of the groundwater conditions were based on data from 223 hydrogeological and geological-engineering boreholes. Within the Pleistocene-Holocene aquifer there are numerous thin layers of silts, organic silts and clays, and therefore it was divided into the model to six layers, three permeable and three semipermeable. The calculation results show that the tunnel only slightly influence on groundwater flow. In groundwater balance no changes are noticeable after simulating the tunnel. In aquifers, through which the tunnel is simulated, slight bend of watertable level is observd (changing water table level from 0.5 to 3.0 cm). Application of TBM method and construction of the tunnel without drainage, makes no quantitative risks of groundwater resources in the vicinity of the investment.