Razvoj ritmične topografije žala Lopata (Dugi otok)

master's thesis

• Title (english): Evolution of rhythmic topography of the Lopata beach (Island of Dugi otok)
• Author: Terezija Godinić
• Mentor: Kristina Pikelj (mentor)
• Committee member: Kristina Pikelj (predsjednik povjerenstva)
• Committee member: Sanja Faivre (član povjerenstva)
• Committee member: Danijel Orešić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Geography); Zagreb
• Defense date and country: 2024-02-02, Croatia
• Scientific / art field, discipline and subdiscipline: INTERDISCIPLINARY AREAS OF KNOWLEDGE; Geography

Abstract

U ovom radu analiziran je mehanizam nastanka ritmične topografije na žalu Lopata (Dugi otok). Ritmičnu topogafiju čine mnogobrojne pravilno razmaknute grupacije sedimenta sličnih oblika. Za vrijeme terenskog rada u rujnu 2023. godine fotografiran je sediment duž žala unutar kojeg je uočen detritus vrste Posidonia oceanica. S pomoću fotografija sedimenta izračunata je veličina zrna u programu ImageJ i definirana njegova zaobljenost. Prikupljeni su podaci o brzini jugoistočnog vjetra te s pomoću njih izračunata visina i period vala u moru ograničenog privjetrišta i ograničenog trajanja puhanja vjetra. Žalo Lopata fotografirano je dronom u razdoblju od studenog 2020. do travnja 2021. godine. Fotografije su obrađene metodom digitalne fotogrametrije u programu AgiSoft Metashape te su potom od novonastalih digitalnih elevacijskih modela izrađene konturne i razlikovne karte modela u programu Surfer. Ritmična topografija na žalu Lopata postojana je na dvije razine; na nižoj razini su oblici manjih dimenzija i sitnijeg sedimenta, a na višoj razini su oblici većih dimenzija i krupnijeg sedimenta. Jugoistočan vjetar uvjetuje visinu valova koja je bitna za stvaranje oblika ritmične topografije, a mehanizam nastanka može se povezati s refrakcijom valova koji dolaze na žalo Lopata.

Abstract (english)

This thesis analyses the mechanism of rhythmic topography genesis on beach Lopata (island Dugi otok). Rhythmic topography consists of many evenly distributed sediment groups of similar shapes. The sediment on the beach was photographed in September of 2023. Detritus of Posidonia oceanica was recorded among the sediment. Sediment particle roundness was evaluated and size calculated using program ImageJ. Wave height and period were calculated using the speed of southeastern wind. The beach Lopata was also photographed with a drone from November of 2020 to April of 2021. These photos were edited using digital photogrammetry program AgiSoft Metashape and Surfer. Rhythmic topography of beach Lopata is recorded in two levels; lower altitude level consists of smaller and more frequent rhythmic pattern and finer sediment; higher altitude level consists of bigger and wider rhythmic pattern and sediment particles of larger size. Rhythmic topography of beach Lopata appears due to the refraction of waves which are created by the southeastern wind during storms.

• Keywords: žalo; ritmična topografija; sediment; Posidonia oceanica; jugoistočni vjetar; visina valova; refrakcija valova
• Keywords (english): beach; rhythmic topography; sediment; Posidonia oceanica; southeastern wind; wave height; wave refraction
• Language: croatian
• URN:NBN: urn:nbn:hr:217:435741
• Study programme: Title: Graduate study; specializations in: research; Course: research; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra geografije (sveučilišni/a magistar/magistra geografije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2026-02-02
• Created on: 2024-03-18 14:35:38