Рад у зборнику

објављена

енглески

Vladimir Živanović, Nataša Ravbar, Igor Jemcov

Validation of vulnerability assessment by means of the Time Dependent, Model: case study from the Slovenian karst catchment

Proceedings of IAH2019, the 46th Annual Congress of the International Associaton of Hydrogeologists, Málaga (Spain), September 22-27, 2019

J. Jaime Gómez Hernández, Bartolomé Andreo Navarro

International Association of Hydrogeologists (IAH)

2019

Groundwater vulnerability assessment methods are continuously being developed and existing methods are
very often modified to provide better simulation of natural protection conditions and more objective results.
Most frequently used methods are based on calculation of predefined parameters influencing water infiltration
and underground flow, which can often lead to bias conclusions related to vulnerability evaluations. Some
other methods, like the Time Dependent Model (TDM) are based on an approach, where parametrization is obtained
at the final stage of the assessment. The main specifics are focused on the calculations of different flow
travel time components, e.g., surface and groundwater flow (vertical flow path through the unsaturated zone,
as well as horizontal flow path through the saturated zone). Moreover, the qualitatively different approach of
vulnerability assessment enables direct translation of the results into sanitary protection zones according to
the particular state legislation requirements. The TDM has been developed and successfully applied at several
locations in the Serbian part of the Carpato-Balcanides. This paper presents its first application to the Slovenian
part of the Dinaric karst and comparison to the most frequently applied methods of intrinsic vulnerability
mapping in karst aquifers. An attempt to use the TDM as a groundwater assessment validation has also been
made. The catchment of the Podstenjšek springs located at the Upper Pivka Valley in Southwestern Slovenia
has been selected as a test site. In the past, four different methods of vulnerability mapping have already
been applied (EPIK, PI, Slovene Approach, Simplified Method) to this test site using the same database and
validated by means of tracer tests. The test site is characterized by temporal hydrologic variability, expressed
by surface-groundwater interactions and variable drainage divides. The application of the TDM showed an
alternative possibility to consider hydrologic variability in assessing groundwater vulnerability. In the case
study it allowed clearer allocation of zones that are particularly vulnerable in various hydrologic conditions.
The resulting groundwater vulnerability map shows the degrees of vulnerability, which are in direct function
of surface and groundwater travel times and can thus be directly translated into protection zones according
to Slovene legislation criterion. The results of the TDM assessment and comparison analysis can also be used
as a tool for validation of vulnerability indices defined by other assessment methods.

625

625

978-84-938046-3-3

Slovenija

Ocena ranjivosti podzemnih voda, karstne podzemne vode, TDM metoda, delineacija sanitarnih zona, Slovenački karst

Groundwater vulnerability assessment, Time dependent model (TDM), Karst groundwater, Groundwater protection zoning, Slovene karst

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