Comparison of models MIKE3 and PCFLOW3D: hydrodynamic simulations in the gulf of Trieste

Dušan Žagar (Avtor), Elvira Džebo (Avtor), Gregor Petkovšek (Avtor)

Povzetek

Modeli tokovanja priobalnih območij so uporabno orodje za napovedovanje stanja morja, hkrati pa tudi osnova za simulacije transporta onesnažil. V izvedeni študiji smo na območju Tržaškega zaliva primerjali dva podobna tridimenzionalna baroklina modela, PCFLOW3D in MIKE3. Poleg vizualne primerjave smo rezultate primerjali tudi numerično po metodi RMSDN, z metodo normaliziranega odstopanja korena povprečne kvadratne napake (RMS). Izbrali smo značilne primere tokov, kjer so podobnosti in razlike jasno vidne. Upoštevali smo gostotne tokove, vpliv močnega in šibkega vetra (burje in maestrala) ter plimovanja. V enem primeru smo uporabili konstantne koeficiente turbulentne viskoznosti v horizontalni in vertikalni smeri, odstopanja so bila v tem primeru odvisna od uporabljene numerične sheme in robnih pogojev v obeh modelih. V vseh drugih primerih smo uporabili kolikor mogoče podobne modele turbulence, ki se pogosto uporabljajo v cirkulacijsih modelih: Smagorinsky v horizontalni smeri, v vertikalni pa k-є v modelu MIKE3 in Mellor-Yamada v modelu PCFLOW3D. Na območju vtoka Soče smo izvedli tudi primerjavo z zgoščeno numerično mrežo v primerih gostotnih tokov in močne burje. Rezultati obeh modelov so podobni, vendar pa so razlike opazne. Izvirajo predvsem iz različnih modelov turbulence in definicije robnih pogojev. Rezultate obeh modelov smo primerjali še z modelom POM. Trojna primerjava kaže v splošnem zelo podobno sliko tokov. Glede na rezultate sodimo, da smemo oba modela, MIKE3 in PCFLOW3D, uporabljati na območjih, ki so po svojih značilnostih podobna Tržaškemu zalivu.

Ključne besede

hidrodinamika;tokovi;Tržaški zaliv;hidrologija;

Podatki

Jezik:	Slovenski jezik
Leto izida:	2013
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	UL FGG - Fakulteta za gradbeništvo in geodezijo
Založnik:	Univerza v Ljubljani, Fakulteta za gradbeništvo in geodezijo
UDK:	532.5:551.468.2(450Trst)
COBISS:	7125601
ISSN:	0352-3551
Št. ogledov:	1114
Št. prenosov:	527
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarni naslov:	Primerjava modelov MIKE3 in PCFLOW3D: simulacije hidrodinamike v Tržaškem zalivu
Sekundarni povzetek:	Coastal sea circulation models are a useful tool for sea forecasting and a good starting point for calculating pollutant transport. Two similar three-dimensional baroclinic hydrodynamic models (PCFLOW3D and MIKE3) were compared on a case study of the Gulf of Trieste. The comparison was not based only on the graphic (visual) parameters, but was also numerically evaluated using the normalised root-mean-square deviation method (RMSDN). Typical cases of circulation were selected, where the similarities and differences between both models are clearly visible. Density-driven flows were studied, as well as the impact of strong wind (bora), mild wind (maestral) and the tide on circulation. In one case, constant coefficients of turbulent viscosity in the horizontal and vertical directions were used. In this case the results show dependence on the different numerical schemes and on the definition of boundary conditions of both models. In all other cases, the turbulence models used were as similar as possible, selected among the ones usually used in circulation models (Smagorinsky in the horizontal direction in both models and in the vertical direction k-є and Mellor-Yamada in MIKE3 and PCFLOW3D, respectively). An additional comparison with refined grid was performed in the events of density-driven flow and strong bora wind in the area of the Soča river inflow. The results of both models are similar. However, there are noticeable local discrepancies due to the differences between the models, mostly the different turbulence models and the boundary conditions definition. The results were also compared to simulations performed by the POM model. This three-way comparison showed in general a very similar picture of circulation. According to the results, both models, MIKE3 and PCFLOW3D, can be used interchangeably in areas with characteristics similar to the Gulf of Trieste.
Sekundarne ključne besede:	hydrodynamic model;circulation;Gulf of Trieste;PCFLOW3D;
URN:	URN:NBN:SI
Vrsta datoteke:	application/pdf
Vrsta dela (COBISS):	Delo ni kategorizirano
Strani:	str. 117-133
Letnik:	26
Zvezek:	ǂ[št.] ǂ45
Čas izdaje:	2013
ID:	9150298