doktorska disertacija
Vanja Ramšak (Avtor), Dušan Žagar (Mentor), Matjaž Mikoš (Član komisije za zagovor), Matjaž Četina (Član komisije za zagovor), Milena Horvat (Član komisije za zagovor), Boris Kompare (Član komisije za zagovor)

Povzetek

Numerično modeliranje tokov onesnažil med okoljskimi segmenti

Ključne besede

gradbeništvo;disertacije;transport sedimentov;onesnažila;gibalna količina ladijskega vijaka;valovi;model izmenjave plinov;model PCFLOW3D;Tržaški zaliv;Koprski zaliv;Sediment;Disertacije;Transport;

Podatki

Jezik: Slovenski jezik
Leto izida:
Izvor: Ljubljana
Tipologija: 2.08 - Doktorska disertacija
Organizacija: UL FGG - Fakulteta za gradbeništvo in geodezijo
Založnik: [V. Ramšak]
UDK: 532:519.87:504.054(262.3)(26.04)(043.3)
COBISS: 6436705 Povezava se bo odprla v novem oknu
Št. ogledov: 1916
Št. prenosov: 483
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Angleški jezik
Sekundarni naslov: Numerical modelling of pollutant fluxes between environmental segments
Sekundarni povzetek: This doctoral dissertation focuses on numeric modelling of sediment resuspension and transport as well as pollutant fluxes between the sediment, water and air. These processes are an important part of the mass balance of the sediments and pollutants in the aquatic environment. Sediment resuspension is influenced by sea currents and waves, in shallow bays also by maritime traffic. We developed a new model that calculates shear velocities at the sea bottom using information on navigation and the ship's characteristics. The existing three-dimensional mathematical model PCFLOW3D was upgraded with the interface to couple with the wave model SWAN. With it we performed numerous simulations in which we combined different sediment resuspension forcing factors: currents, waves, and navigation. The simulation results show that the most important factor in ordinary meteorological conditions is navigation since the bottom shear velocities were locally by an order of magnitude higher than the ones caused by other forcing factors. With the new model it is also possible to estimate the influence of different vessels on the bottom. In addition we measured the suspended sediments / studied the hysteresis effect on the river Idrijca and tried to estimate the transportation of mercury in the catchment of the Idrijca and the Soča towards the Gulf of Trieste. However, no reliable results could be obtained due to several organisational difficulties. With the use of the improved Gårdfeldt method and GEM we calculated the annual evasion of mercury in the Mediterranean Sea. The obtained high results compared with the results of other studies show that either the processes in the boundary layer, which have not yet been modelled, play a very important role in mercury evasion, or that there are large amounts of mercury in the Mediterranean that have so far not been discovered.
Sekundarne ključne besede: civil engineering;thesys;sediment transport;ship`s propeller momentum;waves;suspended sediment hysteresis;evasion;gas exchange model;PCFLOW3D model;Gulf of Trieste;Koper Bay;
URN: URN:NBN:SI
Vrsta datoteke: application/pdf
Vrsta dela (COBISS): Doktorska disertacija
Komentar na gradivo: Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo, Podiplomski študij gradbeništva, Doktorski študij
Strani: XXVI f., 164 str.
Vrsta dela (ePrints): thesis
Naslov (ePrints): Numerical modelling of pollutant fluxes between environmental segments
Ključne besede (ePrints): transport sedimentov;gibalna količina ladijskega vijaka;valovi;histereza lebdečih plavin;izmenjava plinov med vodo in zrakom;model izmenjave plinov;model PCFLOW3D;Tržaški zaliv;Koprski zaliv
Ključne besede (ePrints, sekundarni jezik): sediment transport;ship’s propeller momentum;waves;suspended sediment hysteresis;evasion;gas exchange model;PCFLOW3D model;Gulf of Trieste;Koper Bay
Povzetek (ePrints): Obravnavamo numerično modeliranje privzdigovanja in transporta sedimenta ter tokov onesnažil med sedimentom, vodo in zrakom. Ti procesi so pomemben del masnih bilanc sedimenta in onesnažil v vodnem okolju. Na privzdigovanje sedimenta imajo vpliv tokovi in valovi, v plitvih zalivih pa tudi pomorski promet. Izdelali smo nov model, ki iz podatkov o plovbi in značilnostih ladij izračuna strižne hitrosti ob dnu zaradi delovanja ladijskega vijaka. Obstoječi tridimenzionalni matematični model PCFLOW3D smo nadgradili z vmesniki za povezovanje z modelom valovanja SWAN. Na območju Tržaškega in Koprskega zaliva smo z nadgrajenim modelom PCFLOW3D izvedli simulacije s kombinacijami različnih dejavnikov (tokovi, valovi, plovba) na privzdigovanje sedimenta. Rezultati simulacij kažejo, da je v običajnih meteoroloških razmerah najpomembnejši dejavnik plovba, saj so lokalne strižne hitrosti ob dnu v obravnavanih primerih za red velikosti večje od drugih vplivov. Z novim modelom je mogoče ovrednotiti vpliv različnih plovil na dno in ob danih koncentracijah onesnažil izračunati njihov vnos v vodni stolpec zaradi meteoroloških dejavnikov in plovbe. Meritve lebdečin plavin na reki Idrijci v nestacionarnih pogojih za ovrednotenje histereze lebdečih plavin in nadaljnje ovrednotenje transporta živega srebra v porečjih Idrijce in Soče proti Tržaškemu zalivu zaradi velikih logističih težav niso dale pričakovanih rezultatov. Z izpopolnjeno metodo Gårdfeldt in modelom izmenjave plinov smo izračunali izmenjavo živega srebra med vodo in ozračjem v Sredozemskem morju. Zelo visoki rezultati v primerjavi z drugimi izvedenimi študijami nakazujejo, da imajo pomembno vlogo pri izmenjavi procesi v mejni plasti, ki jih doslej ni bilo mogoče modelirati ali da so na območju Sredozemlja prisotni razmeroma veliki, doslej nepoznani viri živega srebra.
Povzetek (ePrints, sekundarni jezik): This doctoral dissertation focuses on numeric modelling of sediment resuspension and transport as well as pollutant fluxes between the sediment, water and air. These processes are an important part of the mass balance of the sediments and pollutants in the aquatic environment. Sediment resuspension is influenced by sea currents and waves, in shallow bays also by maritime traffic. We developed a new model that calculates shear velocities at the sea bottom using information on navigation and the ship's characteristics. The existing three-dimensional mathematical model PCFLOW3D was upgraded with the interface to couple with the wave model SWAN. With it we performed numerous simulations in which we combined different sediment resuspension forcing factors: currents, waves, and navigation. The simulation results show that the most important factor in ordinary meteorological conditions is navigation since the bottom shear velocities were locally by an order of magnitude higher than the ones caused by other forcing factors. With the new model it is also possible to estimate the influence of different vessels on the bottom. In addition we measured the suspended sediments / studied the hysteresis effect on the river Idrijca and tried to estimate the transportation of mercury in the catchment of the Idrijca and the Soča towards the Gulf of Trieste. However, no reliable results could be obtained due to several organisational difficulties. With the use of the improved Gårdfeldt method and GEM we calculated the annual evasion of mercury in the Mediterranean Sea. The obtained high results compared with the results of other studies show that either the processes in the boundary layer, which have not yet been modelled, play a very important role in mercury evasion, or that there are large amounts of mercury in the Mediterranean that have so far not been discovered.
Ključne besede (ePrints, sekundarni jezik): sediment transport;ship’s propeller momentum;waves;suspended sediment hysteresis;evasion;gas exchange model;PCFLOW3D model;Gulf of Trieste;Koper Bay
ID: 8313076