736 KB42 KB199920252017Četina, MatjažRajar, Rudolfštevilka:52letnik:letn 30str. 37-50ISSN:0352-3551COBISSID_HOST:8129633URN:URN:NBN:SI:doc-74362E0KenslFakulteta za gradbeništvo in geodezijoActa hydrotechnicacurrent measurementsJaponsko morjemeritve tokovmorje Yatsushiroradioactive pollutionradioaktivna onesnažilaSea of Japanthree-dimensional numerical modeltridimenzionalni numerični hidrodinamični modelYatsushiro SeaCalibration of three-dimensional model PCFLOW3D - a comparison with measurements from the Yatsushiro Sea and the Sea of Japan| Umerjanje tridimenzionalnega modela PCFLOW3D - primerjava z meritvami v morju Yatsushiro In Japonskem morju|PCFLOW3D is a three-dimensional numerical model that simulates the hydrodynamic circulation and transport/dispersion of various pollutants. As the first hydrodynamic (HD) part is crucial for the reliable simulation of further transport/dispersion processes, we have been diligently developing it for several years, calibrating and verifying it at every stage of development. This paper presents two cases where it was possible to draw a comparison with current measurements or observations, and describes several improvements to the model that proved necessary in order to simulate the desired range of complex hydrodynamic situations. In the first case (Case A) we made good use of the available, quite detailed measurements of currents in the Yatsushiro Sea (Japan). Due to the very high and variable current velocities we had to include a better turbulence model (Smagorinsky) to get acceptable agreement with the measurements. In the second case (Case B) we simulated HD circulation in the Sea of Japan, where thermohaline forcing is very important; this called for the model to be completed with a special term, namely so-called topographic stress. In both cases the final agreement is good; in Case B we also describe the simulation of the transport/dispersion of radioactive pollutants in the Sea of JapanPCFLOW3D je tridimenzionalni numerični model za simulacijo hidrodinamičnih tokov in za prenos in širjenje onesnažil. Ker je prvi % hidrodinamični % del zelo pomemben za zanesljivo simulacijo transportno/disperzijskih procesov, smo ga razvijali več let in ga v vsaki fazi umerjali in preverjali. V tem prispevku opisujemo dva primera, kjer je bila možna primerjava z rezultati meritev, in opisujemo nekaj dopolnitev modela, potrebnih za zanesljivo simulacijo nekaterih hidrodinamičnih pojavov. V prvem primeru (primer A) smo izkoristili razpoložljive, zelo detajlne rezultate meritev v morju Yatsushiro (Japonska). Zaradi izredno velikih in spremenljivih hitrosti tokov smo morali vključiti turbulentni model Smagorinsky, da smo dobili sprejemljivo ujemanje izračunov z rezultati meritev. V drugem primeru (primer B) smo simulirali cirkulacijo v Japonskem morju, kjer spremembe gostote vode zaradi spremenljive temperature in slanosti pomembno vplivajo na hitrosti toka. Model smo morali dopolniti s t. i. topografsko napetostjo (angl. topographic stress). V obeh primerih smo dosegli dobro ujemanje z rezultati meritev. V drugem primeru opisujemo tudi simulacijo transporta in disperzije radioaktivnih onesnažil v Japonskem morjuTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za gradbeništvo in geodezijo