The influence of the heterogeneity of the aquifer on the assessment of groundwater disposable resources
Journal Title: Biuletyn Państwowego Instytutu Geologicznego - Year 2008, Vol 431, Issue 431
Abstract
Reliable assessment of groundwater resources in fractured medium requires a reasonable degree of recognition of real parameters of the rock environment and flow path network. There are numerous limitations in the use of the model of the equivalent porous medium, related e.g. both to the impossibility of prediction of the groundwater table distribution and the limited communication between the constituents of the hydraulic system (Motyka, 1998; Nawalany, 1999). The present considerations are based on two examples. The first one is from the area of the occurrence of karstic-fractured formations of the Opole Triassic aquifer, whereas the second one is from porous-fractured Flysh deposits of the Carpathian aquifer. In either case, a method of finite differences (Modflow) has been applied. As shown by the research, the usage of the deterministic approach and the analogue equivalent porous medium (EPM) could create incorrect conclusions in relation to water resources of the system. Depressions in individual wells are in most cases possible to be simulated, but the attempt to simulate an interaction between them can fail. The case study of the Tarnów Opolski region confirms the above remarks. The karstic-fractured Opole aquifer (especially if covered with younger sediments acting as an isolating layer) remains unrecognized in respect of the real network of fractures and channels. The article is an attempt to analyse the possibility of the existence of previously uninterpreted zones of preferential flow and their influence on the final estimation of resources. In case of the Carpathian Flysh, the modeling research, representing finally the conformity of the groundwater flow pattern and the amount of resources in the regional scale, do not allow for acquiring realistic images of local captures. A safe yield limit of a single well, approved in compliance with standard procedures, appears to be two to three times exaggerated in a long-term period of exploitation. The discussion and reasons of errors and limitations of the applied modelling methods are also presented.
Authors and Affiliations
Stanisław STAŚKO, Marek WCISŁO
Keywords
Related Articles
- EP ID EP63581
- DOI -
- Views 44
- Downloads 0
THE INFLUENCE OF AGRICULTURAL DRAINAGE SYSTEMS ON GROUNDWATER QUALITY AN EXAMPLE OF THE TURSKO B WELL FIELD
In the recharge area of the Tursko B well field supplying water to the town of Pleszew, the contamination plume that flows towards the wells has been evidenced. The intensive groundwater contamination is caused by infilt...
THE OCCURRENCE AND PROSPECTIVE RESOURCES OF MOLYBDENUM AND TUNGSTEN ORES IN POLAND
The Myszków deposit located in the contact zone of the Małopolska and Upper Silesian blocks is the only one documented Mo-Cu-W porphyry type deposit in Poland. Inferred resources of sulfide-oxide ores are ca. 0.3 million...
ZALEŻNOŚĆ GRANICY PŁYNNOŚCI IŁÓW OD ZEWNĘTRZNEJ POWIERZCHNI WŁAŚCIWEJ I SKŁADU KATIONÓW WYMIENNYCH
Dotychczasowe wyniki badań dotyczące granicy płynności gruntów spoistych wskazują na wyraźną zależność jej wartości od wielkości sił międzycząsteczkowych, tj. ciśnienia odpychania warstw dyfuzyjnych oraz ciśnienia przyci...
SPOSÓB KORELACJI ANOMALII SEJSMICZNYCH Z INFORMACJĄ OTWOROWĄ W ANALIZIE SEDYMENTOLOGICZNEJ REJONU PUSTKÓW–SĘDZISZÓW (POŁUDNIOWA CZĘŚĆ ZAPADLISKA PRZEDKARPACKIEGO)
Zintegrowana analiza anomalii sejsmicznych wraz z interpretacją danych geofizyki otworowej dała podstawy do odtworzenia środowiska sedymentacji osadów mioceńskich zapadliska przedkarpackiego. Zmienność wykształcenia osad...
PIERWSZY W POLSCE SYSTEM WCZESNEGO OSTRZEGANIA O ZAGROŻENIU OSUWISKOWYM W CZASIE RZECZYWISTYM NA PRZYKŁADZIE WYBRANYCH LOKALIZACJI W BESKIDZIE NISKIM
W artykule zaprezentowano nowoczesny system wczesnego ostrzegania i monitoringu osuwisk, zainstalowany w Beskidzie Niskim w województwie małopolskim. System jest pierwszym tego typu w Polsce i został zbudowany w ramach...