Identification of hydraulic connections river Odra and groundwater eastern part of Zagreb aquifer : master’s thesis

U ovom diplomskom radu je identificirana hidraulička veza rijeke Odre s podzemnim vodama istočnog dijela zagrebačkog vodonosnika. U analizama su korišteni podaci iz piezometra B-153 i hidrološke postaje Donja Poljana u razdoblju od 1.1.2004. do 31.8.2012. godine. Kako bi se utvrdila njihova veza, korištene su tri statističke metode: korelacija, regresija i kroskorelacija. Rezultati obrade prikazani su u obliku koeficijenata, dijagrama i korelograma u programu Microsoft Excel. Metodom korelacije dobiven je koeficijent korelacije koji pokazuje slabiju povezanost vodostaja Odre i razina podzemne vode zagrebačkog vodonosnika. Metodom regresije dobiven je nizak koeficijent determinacije koji ukazuje na nisku pouzdanost prognoziranja vodostaja rijeke Odre na temelju razine podzemne vode. Metodom kroskorelacije dobiveno je vrijeme zakašnjenja promjene vodostaja rijeke Odre na promjene razine podzemne vode.In this thesis the hydraulic influence between water level of Odra river and groundwater level of eastern part of Zagreb aquifer was determined. The analysis used data from piezometers B-153 and hydrological station Donja Poljana in the period from 1.1.2004. to 31.8.2012. In order to determine their relationship, three statistical methods were used: correlation method, regression method and cross correlation method. Data results are presented in the form of coefficient, diagram and correlogram in Microsoft Excel. The correlation method obtained correlation coefficient which shows weaker connection betwen water level of Odra river and grounwater levels of Zagreb aquifer. The regression method obtained low coefficient of determination indicating low reliability of groundwater level data used to forecast water level data of Odra river. The cross correlation method determined lag time between water level of Odra river and groundwater level of Zagreb aquifer