Procjena brzine trošenja obalnog klifa otoka Vrgade

undergraduate thesis

• Title (english): Estimation of costal cliff retreat rate on the Vrgada Island
• Author: Ana Erić
• Mentor: Kristina Pikelj (mentor)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Granter: University of Zagreb; Faculty of Science; (Department of Geology); Zagreb
• Defense date and country: 2023-09-21, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Erozija obala, uključujući klifove, predstavlja značajan izazov za obalne zajednice diljem
svijeta. Ovaj rad fokusira se na istraživanje brzine erozije klifa na otoku Vrgada, koristeći digitalnu
fotogrametriju i softver Agisoft Photoscan i Surfer za izradu digitalnih visinskih modela i
razlikovnih digitalnih modela površine. Analiza razlika u visini i volumenu materijala na klifu
omogućila je praćenje promjena tijekom zimske i ljetne sezone 2022./2023. godine. Rezultati
istraživanja ukazuju na kontinuiranu eroziju klifa, koja se značajno povećala tijekom razdoblja
obilnih padalina i jakih vjetrova. Jedni od glavnih čimbenika padinskih procesa na klifu otoka
Vrgade su strmi nagib klifa i utjecaj vode koji dovode do osipanja i odrona materijala. Glavni odron
materijala u travnju 2023. godine prouzročio je značajne promjene topografije klifa, s naglaskom
na nagomilavanju materijala u podnožju klifa i smanjenju padine na vrhu. Kad pogledamo prema
budućnosti, sve toplije i olujne klime, podizanje razine mora i povećanje ljudskih aktivnosti
neizbježno će utjecati na obalno okružje otoka Vrgada. Ovaj se mijenjajući obalni krajolik izravno
povezuje s opasnostima za sigurnost kupača koji često posjećuju područje ispod klifa. Kako erozija
ostaje prisutna, postoji sve veća prijetnja padu kamenja i urušavanjima koja bi mogla ugroziti
sigurnost ljudi na plaži.

Abstract (english)

Coastline erosion, including cliffs, presents a significant challenge for coastal
communities worldwide. This study focuses on investigating the rate of cliff erosion on Vrgada
Island, using digital photogrammetry and the Agisoft Photoscan and Surfer software to create
digital elevation models and digital surface models of difference. The analysis of height and
volume differences in cliff materials allowed for monitoring changes during the winter and summer
seasons of 2022/2023. The research results indicate continuous cliff erosion, which significantly
intensified during periods of heavy rainfall and strong winds. Among the main factors contributing
to slope processes on the cliffs of Vrgada Island are the steep cliff gradient and the influence of
water, leading to material collapsing and shedding. The major material collapsing in April 2023
caused significant topographical changes in the cliff, with an emphasis on material accumulation
at the base of the cliff and a reduction in the slope at the top. Looking toward the future, the
increasingly warmer and stormy climates, rising sea levels, and heightened human activities will
inevitably impact the coastal environment of Vrgada Island. This changing coastal landscape is
directly linked to risks for the safety of bathers who frequently visit the area beneath the cliff. As
erosion continues to be present, there is a growing threat of rockfalls and collapses that could
jeopardize the safety of people on the beach.

• Keywords: obalni klif; digitalna fotogrametrija; padinski procesi; erozija
• Keywords (english): coastal cliff; digital photogrammetry; slope processes; erosion
• Language: croatian
• URN:NBN: urn:nbn:hr:217:022923
• Study programme: Title: Environmental Sciences; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) struke znanosti o okolišu (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) struke znanosti o okolišu)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2025-09-21
• Created on: 2023-09-25 12:46:19