Hydrogeological characteristics of Mrežnica river catchment area upstream of hydrological station Juzbašići : master's thesis

Krško područje može se smatrati tzv. „crnom kutijom“, čiju osnovu čini specifična geološka građa – topive stijene, poput vapnenaca i dolomita, na koju su potom djelovali strukturno – tektonski procesi i klimatski uvjeti. U ovom diplomskom radu obrađeno je područje, koje je obuhvatilo sliv gornjeg toka rijeke Mrežnice, od njenog izvora do hidrološke postaje Juzbašići. Opisane su najvažnije topografske, klimatološke, geološke, strukturno - tektonske i hidrogeološke značajke. Cilj rada bio je odrediti pripadajuće slivno područje, odnosno odrediti prostor u sklopu kojega se odvija ulaz, tok vode i izlaz iz hidrogeološkog sustava. Provedeno je definiranje razvodnice prema poznatim topografskim i hidrogeološkim odnosima, no ono isprva nije dalo dobre rezultate u bilanci voda. Proširenjem sliva na područje Dabarskog polja i ponovnim bilanciranjem dobivena je ukupna bilanca ΔQ = -0,55 m3/s. Ona ukazuje na nešto veći ulaz od izlaza, no može se smatrati zadovoljavajućim rezultatom u okvirima preciznosti i mogućnosti kojima je rad napravljen.Karst can be considered as a „black box“, whose base forms specifical geology – soluble rocks, like limestone and dolomite – who were affected by structural – tectonic processes and climatic conditions. This thesis deals with catchment area of upper part of river Mrežnica, from its source to hydrological station Juzbašići. Most important topographical, climatic, geological, structural – tectonic i hydrogeological characteristics were described. Goal of this work was determination of belonging catchment area, in which entrance, flow and exit from the hydrogeological system occurs. Topographical and hydrogeological border of catchment area was assigned, but it didn't give good results in water balance calculation. Catchment area was then extended to a territory of Dabar field, and with water balance calculation carried out again, there was ΔQ = -0,55 m3/s water balance in total. It indicates on a bigger input of water, rather than a output, but it can be considered as a correct result, due to accuracy and available possibilities