Određivanje značajki napajanja vodonosnog sustava na širem području crpilišta Sikirevci u istočnoj Slavoniji

doctoral thesis

• Title: Određivanje značajki napajanja vodonosnog sustava na širem području crpilišta Sikirevci u istočnoj Slavoniji : doktorski rad
• Title (english): Determination of the aquifer system recharge characteristics on broader area of the Sikirevci wellfield in eastern Slavonia : doctoral thesis
• Author: Maja Briški; MBZ: 319271
• Mentor: Kristijan Posavec (mentor)
• Committee member: Andrea Bačani (predsjednik povjerenstva)
• Committee member: Kristijan Posavec (član povjerenstva)
• Committee member: Željka Brkić (član povjerenstva); MBZ: 189785
• Granter: University of Zagreb; Faculty of Mining, Geology and Petroleum Engineering; Zagreb
• Defense date and country: 2015-07-21, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mining, Petroleum and Geology Engineering; Geological Engineering
• Universal decimal classification (UDC): 55 - Geology. Meteorology. Hydrology

Abstract

Vodonosnik zahvaćen na crpilištu Sikirevci pripada strateškim zalihama podzemnih voda Republike Hrvatske. Za uspješno gospodarenje ovim važnim rezervama nužno je poznavati dinamiku podzemne vode u vodonosnom sustavu u postojećim uvjetima na temelju koje se može analizirati ponašanje sustava u različitim budućim scenarijima. Cilj provedenih istraživanja usmjeren je na detaljno istraživanje hidrodinamičkih značajki zahvaćenog vodonosnog sustava, definiranje napajanja vodonosnog sustava te porijekla i starosti podzemne vode. Kao alat za određivanje napajanja istraživanog vodonosnog sustava korišten je trodimenzionalni numerički model. U radu je prikazan postupak izrade konceptualnog modela te izrada i kalibracija numeričkog modela vodonosnog sustava. Model je kalibriran za razdoblje od pet i pol godina na temelju izmjerenih razina podzemne vode te je postignuto vrlo dobro podudaranje mjerenih i izračunatih vrijednosti. U sklopu terenskih istraživanja prikupljeni su uzorci podzemne vode, oborina i rijeke Save te su napravljene analize stabilnih izotopa kisika i vodika, tricija te osnovnih fizikalno- kemijskih pokazatelja. Izotopna i hidrokemijska istraživanja pomogla su u izradi konceptualnog modela. Koncentracije tricija u podzemnoj vodi pokazale su da je vrijeme zadržavanja vode dulje od 65 godina, što se slaže s rezultatima provedene simulacije trasiranja čestica. Hidrokemijska istraživanja su također pokazala da su u vodonosnom sustavu brzine toka razmjerno niske, što uzrokuje dugo zadržavanje vode u podzemlju. Analiza bilance mase pokazala je da infiltracija oborina predstavlja glavni izvor obnavljanja podzemne vode na području modela, što je potvrđeno rezultatima analiza stabilnih izotopa kisika i vodika. Pražnjenje podzemnih voda odvija se u rijeku Savu, osim u razdobljima visokih vodostaja kada Sava napaja vodonosnik. Iako je u prirodnim uvjetima rijeka Sava hidraulička granica, modeliranje je pokazalo da već kod relativno niskih crpnih količina od 200 L/s dolazi do toka podzemne vode ispod rijeke iz susjedne BiH, što upućuje na prekogranični karakter istraživanog vodonosnog sustava. Količine dotjecanja trebale bi se potvrditi kalibracijom desne obale Save, što nije bilo moguće zbog nepostojanja podataka o razinama podzemne vode na tom području.

Abstract (english)

The aquifer captured on the wellfield Sikirevci is a part of the strategic water reserves
of the Republic of Croatia. For effective management of these important water reserves it is
necessary to know the dynamics of groundwater flow in the aquifer system under existing
conditions which enables us to analyze the behavior of the system in a variety of future
scenarios. The aim of the planned research is focused on a detailed study of hydrodynamic
characteristics of the captured aquifer system, on defining recharge and also the origin and
age of groundwater.
Three-dimensional numerical model was used as a tool of defining recharge of the
investigated aquifer system. This paper describes the process of developing a conceptual
model and the development and calibration of numerical model of groundwater system. The
model was calibrated for a period of five and a half years on the basis of measured
groundwater levels and very good agreement between measured and calculated values was
achieved.
During field works the samples of groundwater, rainfall and river water were collected
and the analysis of stable isotopes of oxygen and hydrogen, tritium and physico-chemical
parameters were conducted. Isotopic and hydrochemical research helped in the development
of a conceptual model. The concentrations of tritium in groundwater showed that the
residence time of water is more than 65 years, which is consistent with the results of the
simulation of particle tracking. Hydrochemical studies have also shown that flow rates in the
aquifer system are relatively low, causing long residence time of water.
Mass balance analysis showed that the infiltration of rainfall is the main source of
groundwater recharge in the area of the model. The same was confirmed by the results of the
analysis of stable isotopes of oxygen and hydrogen. The groundwater discharges in the Sava
river, except during periods of high water levels when Sava river recharges the aquifer.
Although the Save river forms hydraulic boundary in natural conditions, modeling
results have shown that even relatively low pumping rates of 200 L/s cause the flow beneath
the river from the neighbouringh Bosnia and Herzegovina to occur. This suggests
transboundary character of the investigated groundwater system. The amount of inflow should
be confirmed with the calibration of the right bank of the Sava river, which was not possible
due to lack of groundwater levels data in that area.

• Keywords: aluvijalni vodonosni sustav; napajanje; numeričko modeliranje; stabilni izotopi vodika i kisika; MODFLOW; rijeka Sava; tok ispod rijeke
• Keywords (english): alluvial aquifer system; recharge; numerical modelling; stable isotopes of oxigen and hydrogen; MODFLOW; Sava river; under river flow
• Language: croatian
• URN:NBN: urn:nbn:hr:169:322235
• Promotion: 2016-04-17
• Study programme: Title: Applied Geosciences, Mining and Petroleum Engineering; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor znanosti/doktorica znanosti (doktor znanosti/doktorica znanosti)
• Catalog URL: http://katalog.nsk.hr/F/?func=direct&CON_LNG=ZAG&local_base=ZAG01_WEB&doc_number=000611080
• Type of resource: Text
• Extent: 164 str. ; 30 cm
• File origin: Born digital
• Access conditions: Open access
• Created on: 2017-12-11 13:23:02