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Masna bilanca kakovostnih parametrov Cerkniškega jezera : diplomska naloga
ID Bobnar, Špela (Author), ID Panjan, Jože (Mentor) More about this mentor... This link opens in a new window, ID Krzyk, Mario (Co-mentor)

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MD5: 757522E2132EF76586D6F673FAC467A7
PID: 20.500.12556/rul/a3f3467e-82c7-41f0-8e00-918527d6e6fd

Abstract
Diplomska naloga obravnava masno bilanco Cerkniškega jezera, ki je najbolj znano presihajoče jezero na svetu. Jezero v povprečju obstaja tri četrtine leta, četrtino leta pa je dno Cerkniškega polja suho. Skoraj vsako leto doseže površino 20 km2 in volumen 29 milijonov m3. Pred izračunom masne bilance obravnavanega jezera sem s programom AutoCAD Civil 3D iz podatkov digitalnega modela višin izrisala teren Cerkniškega polja. Glede na izrisan teren in dnevno spremembo vodostaja na vodomerni postaji Dolenje Jezero sem izračunala dnevno spremembo volumna vode, s pomočjo katere sem izračunala vodno bilanco jezera. Masno bilanco jezera sem določila glede na pretok in koncentracije parametrov, ki jih je Agencija Republike Slovenije za okolje izvajala na pritokih in iztokih jezera. Spremljala sem različne kakovostne parametre (amonij, ortofosfati, nitrati in nitriti) s poudarkom na celotnem fosforju in dušiku, ki sta najpomembnejša pokazatelja kakovosti vode. V Cerkniško jezero prispe več hranil, kot jih iz njega odteče, kar pomeni, da ima jezero samočistilne sposobnosti. Izjema so le nitriti in amonij, ki v jezeru nastajajo. Izračunala sem tudi obremenitev jezera s fosforjem in dušikom, ki s hidrološkega zaledja prispeta v jezero. Izračuni so bili narejeni za obdobje 2004-2014. Vnos količine fosforja in dušika z leti upada. Leta 2014 je v jezero prispelo 29 ton fosforja in 457 ton dušika. Izračun koncentracije fosforja v jezeru je bil izveden tudi z Vollenweiderjevim modelom. S primerjavo izračunov z meritvami, ki jih je opravila Agencija Republike Slovenije za okolje, sem ugotovila, da ta model zaradi presihajočega značaja jezera za računanje ni primeren.

Language:Slovenian
Keywords:gradbeništvo, diplomska naloga, UNI, Cerkniško jezero, vodna bilanca, masna bilanca, fosfor, dušik
Work type:Undergraduate thesis
Typology:2.11 - Undergraduate Thesis
Organization:FGG - Faculty of Civil and Geodetic Engineering
Place of publishing:Ljubljana
Publisher:[Š. Bobnar]
Year:2016
Number of pages:XIV, 74 str., 7 pril.
PID:20.500.12556/RUL-86104 This link opens in a new window
UDC:556.1(285.2Cerkniško jezero)(043.2)
COBISS.SI-ID:7751265 This link opens in a new window
Publication date in RUL:14.11.2016
Views:3102
Downloads:759
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Secondary language

Language:English
Title:Mass balance of the Quality Parameters in Cerknica Lake
Abstract:
The diploma thesis discusses the mass balance of Cerknica Lake, known as the most famous intermittent lake in the world. The lake is in avegare present for three quarters of a year, and for a quarter of a year, the bottom of Cerknica Polje is dry. Nearly every year, the lake expands to the size of 20 square kilometers, and the volume of 29 million cubic meters of water. Before calculating the mass balance of the lake, I have designed a terain model with the programme AutoCAD Civil 3D, based on the data from the digital land model. According to the designed terain model and a daily change of water level on the hydrometric station Dolenje Jezero, I have calculated daily change of the volume of water and by using this data, I have calculated the water ballance of the lake. The established mass balance of the lake is based on the rate of flow and concentration of parameters, observed on the inflows and swallow holes, by the Slovenian Environment Agency. Various quality parametes have been observed (ammonium, ortophosphates, nitrates, nitrites), with the emphasis on phosphorus and nitrogen which are the most important indicators of water quality. More nutrients come to the lake than flow out of it which means the lake has the capacity to clean itself. The only exceptions are the nitrites and ammonium which are produced in the lake. I have also calculated the impact on the lake of phosphorus and nitrogen which come to the lake from the hydrology. The calculations have been made for the period between years 2004 and 2014, In the year 2014, 29 tones of phosphorus and 457 tones of nitrogen have come into the lake. The calculation of phosphorus concentration has also been done with the Vollenweider model. By comparing calculations with observed values, observed by the Slovenian Environment Agency, I have established that this model is not suitable for calculations, due to the intermittent nature of the lake.

Keywords:graduation thesis, Cerknica Lake, water balance, water balance, mass balance, phosphorus, nitrogen

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