20.500.12556/RUL-160257 Modeliranje kakovosti voda v porečju Save Bohinjke magistrsko delo Model-based water quality assessment of the Sava Bohinjka catchment master thesis Sava Bohinjka, pomemben pritok reke Save, se zaradi visokih obremenitev s hranili sooča z evtrofikacijo, kar vodi v pomanjkanje kisika. Za boljše razumevanje dinamike kroženja hranil in oblikovanje strategij upravljanja s kakovostjo vode v porečju Save Bohinjke je priporočljivo določiti intenzivnost onesnaženja in pomembne vire hranil. V tej nalogi smo za analizo porečja uporabili model Generalized Watershed Loading Functions (GWLF). Model je bil umerjen in validiran na hidrološke podatke in podatke o kakovosti vode, izmerjene na iztoku iz porečja. Umerjeni model GWLF je bil uporabljen za simulacijo pretoka, skupnega dušika (TN) in skupnega fosforja (TP) na iztoku iz porečja Save Bohinjke do izliva Jezernice (tj. podporečja 1), za obdobje 2007-2021. Uspešnost modela je bila ocenjena z uporabo statističnih kriterijev, kot so koeficient determinacije (R2), Nash Sutcliffe učinkovitost (NSE), odstotek pristranskosti (PBIAS) in razmerje korena povprečnega standardnega odklona (RSR). Porazdelitev odstopanj med opazovanimi in simuliranimi vrednostmi je bila preverjena z uporabo Jarque-Bera (JB) testa in Q-Q diagrama. Vse ocene uspešnosti so se nahajale v sprejemljivem območju. Rezultati so pokazali, da sta povprečni letni obremenitvi podporečja 1 s TN in TP znašali 21,7 oz. 0,38 kg/ha. Podzemna voda je bila identificirana kot glavni vir celotne obremenitve s TN, medtem ko pašniki predstavljajo glavni vir obremenitve s TP. Na enoto površine so k skupni obremenitvi s hranili največ prispevala kmetijska zemljišča, najmanj pa gozdovi. Primerjava obremenitev je pokazala, da k skupni obremenitvi porečja s TN več prispeva podporečje 1, medtem ko več TP prispeva Blejsko jezero. The Sava Bohinjka River is a major tributary of the Sava River that is experiencing eutrophication caused by high nutrient loading, leading to oxygen depletion. Determining the intensity of nutrient pollution and identifying nutrient sources in the Sava Bohinjka catchment is desirable for understanding nutrient dynamics and for informing water quality management strategies. This study analysed the catchment using the Generalized Watershed Loading Functions (GWLF) model. The model was calibrated and validated with measured hydrological and water quality data collected at the catchment outlet. The calibrated GWLF model was used to simulate Discharge, total nitrogen (TN), and total phosphorus (TP) at the outlet from the Sava Bohinjka River catchment till its confluence with the Jezernica River (i.e., Sub-catchment 1), from 2007 to 2021. Model performance was evaluated using statistical measures such as coefficient of determination (R2 ), Nash Sutcliffe Efficiency (NSE), percent bias (PBIAS), and Root Mean Standard Deviation Ratio (RSR). The normality of the residuals between observed and simulated values was checked using Jarque-Bera (JB) test and Q-Q plot. All performance ratings were within acceptable range. The results showed that the mean annual TN and TP from the Subcatchment 1 were 21.7 and 0.38 kg/ha, respectively. Groundwater was identified as the primary contributor to the overall TN load, while pastures were the main source of TP load. Per unit surface area, cropland contributed the highest nutrient loads, while forests had minimal nutrient export. Comparing the nutrient loads from the Sub-catchment 1 and from Lake Bled, higher TN export was found in the former, while the latter appeared to be a distinctive contributor of TP. gradbeništvo magistrsko delo VOI evtrofikacija porečje Save Bohinjke GWLF modeli kakovosti hranila ocena kakovosti vode modeliranje porečij onesnaženje iz razpršenih virov GIS Blejsko jezero civil engineering master thesis eutrophication Sava Bohinjka catchment water quality models nutrients water quality assessment watershed modeling non-point source pollution Lake Bled true false false [Y. O. Ogunfolaji] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2024-08-24 07:45:05 2024-08-24 07:45:14 2025-08-08 13:20:04 0000-00-00 00:00:00 2024 0 Ljubljana 2024 Ljubljana XII, 68 str., 1 f. pril. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 502.51:556.1(282)(497.4)(043.3) 164070 205235971 14931.pdf 14931.pdf 1 640473932EEC99BE9716042606B0D856 38e364b100e6d64973f595b2e14b44e624861c564c19a962c5e3a9a2b46fafcb d78c5ae0-61db-11ef-8f74-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=188835 14932.pdf 14932.pdf 1 0D41A992A96DE848FAFE2049F46C2951 5696cad1b87dc9b9e590fd6f50067c3ed522227e6cc3f69daea2568f68fc1551 d78ccf10-61db-11ef-8f74-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=188836 Fakulteta za gradbeništvo in geodezijo 0 0 0