Title Analysis of wind characteristics during Bora events in the southern region of Croatia
Title (croatian) Analiza karakteristika vjetra za vrijeme epizoda bure na području južne Hrvatske
Author Roko Topić
Mentor Žarko Kovač (mentor)
Committee member Žarko Kovač (predsjednik povjerenstva)
Committee member Jadranka Šepić (član povjerenstva)
Committee member Ivana Weber (član povjerenstva)
Granter University of Split Faculty of Science (Department of Physics) Split
Defense date and country 2024-04-12, Croatia
Scientific / art field, discipline and subdiscipline NATURAL SCIENCES Geophysics
Abstract Bora is a northeasterly, gusty wind which blows along the Adriatic coast. It is present during the whole year, with more frequent and more intense bora episodes appearing during wintertime. Bora-prone regions suitable for wind energy harvesting. Bora can be manifested as a hazardous wind affecting structures, transportation and people. It commonly occurs under a few characteristic synoptic settings over Europe. Anticyclonic and cyclonic bora are main types observed along the Adriatic coast. In the southern part of Croatia, complex terrain and scarcity of measurements make understanding of Bora dynamical generation challenging. Wind speed and direction measurements were obtained for the location of Pometeno Brdo. Data was obtained for the first period from 2010 to 2011, at 10 and 40 m heights above ground, and a second period from 2018, at 60 and 80 m heights above ground. This data was filtered to distinguish bora wind episodes, lasting longer than 10 hours. Furthermore, Copernicus regional reanalysis for Europe (CERRA) produced wind speed is compared to the observations to evaluate the accuracy of the reanalysis during available bora episodes. Additionally, six Bora case studies are selected for further analysis and Weather prediction and forecast (WRF) model simulation to determine the effects of spatial downscaling on bora wind representation. The study case period selection is made regarding three factors: synoptic setting over southern Croatia, average bora wind speed and data availability at different heights above ground. Jenkinson-Collison automated Lamb Weather Typing Classification scheme is used to determine the synoptic weather patterns over southern Croatia during all available bora episodes. Results show satisfactory reproduction of general wind behavior with CERRA for all heights during moderately strong bora episodes. Wind speed during intense bora episodes is reproduced with poor accuracy. WRF downscaling improves wind speed reproduction on all heights.
Abstract (croatian) Bura je sjeveroistočni vjetar s olujnim udarima koji puše duž jadranske obale. Prisutna je tijekom cijele godine, s tim da su češči i intenzivniji udari bure zimi. Područja sklona buri pogodna su za iskorištavanje energije vjetra. Bura se može manifestirati kao opasan vjetar koji utječe na građevine, prijevoz i ljude. Obično se javlja tijekom nekoliko karakterističnih sinoptičkih situacija nad Europom. Anticiklonalna i ciklonalna bura su najčešči oblici bure koji se pojavljuju duž jadranske obale. U južnom dijelu Hrvatske brdovit teren i nedostatak mjerenja predstavljaju izazov za razumijevanje dinamičkog nastanka bure. Za lokaciju Pometeno Brdo dobivena su mjerenja brzine i smjera vjetra. Podaci su dobiveni za prvo razdoblje od 2010. do 2011. godine, na 10 i 40 m visine iznad tla, te drugo razdoblje od 2018. godine, na 60 i 80 m visine iznad tla. Ovi podaci su filtrirani kako bi se ustanovile epizode bure koje traju duže od 10 sati. Nadalje, brzina i smjer vjetra preuzeti od Copernicus regional reanalysis for Europe (CERRA) su uspoređeni s opažanjima kako bi se procijenila točnost reanalize tijekom dostupnih epizoda bure. Također, odabrano je šest slučajeva bure za daljnju analizu i simulaciju putem Weather prediction and forecast (WRF) modela kako bi se odredili učinci poboljšanja prostorne razlučivosti na prikaz bure. Odabir svakog slučaja napravljen je s obzirom na tri čimbenika: sinoptički uvjeti nad južnom Hrvatskom, prosječna brzina bure i dostupnost podataka na različitim visinama iznad tla. Jenkinson-Collisonova automatizirana Lamb Weather Typing Classification shema koristi se za određivanje sinoptičkih vremenskih obrazaca nad južnom Hrvatskom tijekom svih dostupnih epizoda bure. Rezultati pokazuju zadovoljavajuću reprodukciju općeg ponašanja vjetra s CERRA-om za sve visine tijekom umjereno jakih epizoda bure. Brzina vjetra tijekom epizoda intenzivne bure reproducirana je s lošijom točnošću. WRF povećanje prostorne razlučivosti poboljšava reprodukciju brzine vjetra na svim visinama.
Keywords
bora
wind speed
synoptic setting
CERRA
WRF
Keywords (croatian)
bura
brzina vjetra
sinoptički uvjeti
CERRA
WRF
Language english
URN:NBN urn:nbn:hr:166:274475
Study programme Title: Physics; specializations in: specialization in Education, specialization in Astrophysics and Elementary Particle Physics, specialization in Biophysics, specialization in Environmental Physics, specialization in Computational Physics Course: specialization in Environmental Physics Study programme type: university Study level: graduate Academic / professional title: sveučilišni/a magistar/magistra fizike (sveučilišni/a magistar/magistra fizike)
Type of resource Text
File origin Born digital
Access conditions Open access
Terms of use
Public note Physics, specialization in Environmental Physics - studij se izvodi na engleskom jeziku
Created on 2024-05-06 08:28:00