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UAS-BASED MONITORING AND MULTI-TEMPORAL ANALYSIS OF SHORELINE DYNAMICS IN THE KAVATSIT BEACH SECTOR (1980S-2025), SOUTHERN BULGARIAN BLACK SEA COAST.

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Title: UAS-BASED MONITORING AND MULTI-TEMPORAL ANALYSIS OF SHORELINE DYNAMICS IN THE KAVATSIT BEACH SECTOR (1980S-2025), SOUTHERN BULGARIAN BLACK SEA COAST.
Authors: Salieva, Naylyan1
Source: Proceedings of the International Multidisciplinary Scientific GeoConference SGEM. 2025, Vol. 25, p179-190. 12p.
Subject Terms: *SHORELINE monitoring, *SHORELINES, *EROSION, *COASTS, *DRONE aircraft, *TIME series analysis, *GEOMORPHOLOGY, *BEACHES
Abstract: This study investigates shoreline dynamics and morphodynamic variability along the Kavatsi coastal sector (Southern Bulgarian Black Sea coast) through a multi-temporal analysis spanning the 1980s to 2025. By integrating legacy topographic maps, aerial orthophotos, and recent high-resolution Unmanned Aerial System (UAS) photogrammetry (2020-2025), five representative beach-dune systems were assessed: Kavatsite-North, Kavatsite-South, Smokini-North, Smokini-South, and Camping Veselie Beach. UAS-derived orthophotomosaics (3 cm/pixel) and Digital Surface Models (6-60 cm/pixel) were generated using DJI Phantom 4 RTK and WingtraOne drones, supported by RTK-GNSS ground control. Shoreline positions were digitized and analyzed using the Digital Shoreline Analysis System (DSAS v5.0) along 96 transects spaced at 20 m intervals. Results from the 2020-2025 period indicate a predominantly accretional trend, with 77.1% of transects advancing. The mean Net Shoreline Movement (NSM) for the entire sector was +5.48 m, and the mean End Point Rate (EPR) was +0.15 m/yr. Camping Veselie Beach exhibited the highest accretion (+17.25 m NSM; +0.31 m/yr EPR), while Smokini South recorded the most severe erosion (-12.14 m NSM). Kavatsite North was the most stable subunit, with 100% of transects advancing. These findings underscore the spatial heterogeneity of shoreline dynamics, shaped by geomorphological conditions and human impact. The study confirms the utility of UAS photogrammetry for high-resolution coastal monitoring and supports its role in data-driven shoreline management and conservation efforts along the Bulgarian Black Sea coast. [ABSTRACT FROM AUTHOR]
Database: Academic Search Index
Description
Abstract:This study investigates shoreline dynamics and morphodynamic variability along the Kavatsi coastal sector (Southern Bulgarian Black Sea coast) through a multi-temporal analysis spanning the 1980s to 2025. By integrating legacy topographic maps, aerial orthophotos, and recent high-resolution Unmanned Aerial System (UAS) photogrammetry (2020-2025), five representative beach-dune systems were assessed: Kavatsite-North, Kavatsite-South, Smokini-North, Smokini-South, and Camping Veselie Beach. UAS-derived orthophotomosaics (3 cm/pixel) and Digital Surface Models (6-60 cm/pixel) were generated using DJI Phantom 4 RTK and WingtraOne drones, supported by RTK-GNSS ground control. Shoreline positions were digitized and analyzed using the Digital Shoreline Analysis System (DSAS v5.0) along 96 transects spaced at 20 m intervals. Results from the 2020-2025 period indicate a predominantly accretional trend, with 77.1% of transects advancing. The mean Net Shoreline Movement (NSM) for the entire sector was +5.48 m, and the mean End Point Rate (EPR) was +0.15 m/yr. Camping Veselie Beach exhibited the highest accretion (+17.25 m NSM; +0.31 m/yr EPR), while Smokini South recorded the most severe erosion (-12.14 m NSM). Kavatsite North was the most stable subunit, with 100% of transects advancing. These findings underscore the spatial heterogeneity of shoreline dynamics, shaped by geomorphological conditions and human impact. The study confirms the utility of UAS photogrammetry for high-resolution coastal monitoring and supports its role in data-driven shoreline management and conservation efforts along the Bulgarian Black Sea coast. [ABSTRACT FROM AUTHOR]
ISSN:13142704
DOI:10.5593/sgem2025/2.1/s09.21