Naslov
How remote sensing and GIS could improve geomorphological analysis of beaches?

Autori
Mićunović, Marin ; Faivre, Sanja

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Skup
COST Action CA20134 Traces as Research Agenda for Climate Change, Technology Studies, and Social Justice (TRACTS). Working Group 4: RESPONSIBLE FUTURE(S): USING EMERGING TECHNOLOGIES FOR SUSTAINABLE GROWTH.

Mjesto i datum
Zagreb, Hrvatska, 30.06.2023. - 01.07.2023

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
beach ; geomorphology ; remote sensing ; UAV ; GIS

Sažetak
Beaches are a very important touristic resource. However, they are a very dynamic coastal forms. Due to climate change, but also because of significant socio-economic impacts, they are now particularly vulnerable. A trend towards erosion can be observed on many beaches. Consequently, beach monitoring methods are being developed for the purpose of sustainable coastal management. These methods usually include remote sensing and GIS techniques. This study describes the analysis of geomorphological changes of 30 beaches on the island of Hvar, located in the central Adriatic in Croatia. The geomorphological changes are analyzed for the period from 1834 to 2022 using different methods: Analysis of archival maps and photographs, remote sensing, including aerial photographs and UAV, fieldwork, GIS and photogrammetry. The oldest period was analyzed using the 1834 Franciscan Cadastre which was georeferenced and digitized using GIS software. The second period was studied using georeferenced aerial photographs from the 1950s (State Geodetic Administration), which were also digitized in GIS and supplemented by the method of repeat photography. The most recent period was studied using fieldwork, GNSS and UAV surveying. Data was collected using a DJI Phantom 4 pro UAV, while ground control points (GCP) were measured using a Trimble Catalyst DA2 receiver. The collected data was processed in ArcGIS Pro and Agisoft software, where models were generated. By combining GNSS and UAV data, high-resolution models were created with centimeter-level accuracy. The analysis showed a trend of beach erosion and shoreline retreat on almost all the beaches we studied. Average erosion since 1834 was calculated to be of around 50%, while shoreline retreat was measured to average about 6.5 m. These processes are expected to continue in the future, so all the results could be very useful for future beach vulnerability assessment. This work was done with the support of the Croatian Science Foundation (HRZZ-IP-2019-04-9445) SEALeveL project.

Izvorni jezik
Engleski

Znanstvena područja
Geografija

POVEZANOST RADA