IDENTYFIKACJA SYSTEMU KRĄŻENIA WÓD W ARTEZYJSKIM POZIOMIE WODONOŚNYM NA OBSZARZE ZLEWNI KRYNKI (WYSOCZYZNA BIAŁOSTOCKA) NA PODSTAWIE REGIONALNEGO MODELU POLA FILTRACJI

Abstract

IDENTIFICATION OF GROUNDWATER CIRCULATION IN ARTESIAN SYSTEM ON THE AREA OF KRYNKA RIVER CATCHMENT (BIAŁYSTOK HIGHLAND) BASED ON NUMERICAL FLOW MODELA regional numerical flow model was used for quantitative and qualitative characteristics of water balance of the artesian system in the eastern part of the Białystok Highland. The study focused on the Krynka River catchment where the first artesian flow wells were drilled before the 2nd World War. The artesian aquifer is represented by Pleistocene glaciofluvial sands and gravels overlain by poorly permeable layers. A regional approach to the research enabled both avoiding uncertainty concerning model boundary surface and verifying the hypothesis on partial formation of artesian horizon resources outside the catchment area. Calculations of the water balance in a multilayer system were the basis for quantitative characteristics of water flow in the system. The results of the calculations indicate that about 60% of renewable resources of the artesian water-bearing horizon is formed outside the Krynka River catchment area. Recharge of the horizon occurs by water percolation through poorly permeable sediments, and its intensity is spatially variable. The investigations also enabled system net recharge in a regional context. It was possible due to the use of a numerical terrain model and use of the second and third type boundary conditions for upper model surface. The obtained image allowed determination of spatial distribution of recharge and drainage zones of the identified system.