Abstract
Natural beach is controlled by many factors related to wave and tidal forces, wind, sediment, and initial topography. For this reason, if numerous topographic data of beach is accurately collected, coastal erosion/acceleration is able to be assessed and clarified. Generally, however, many studies on coastal erosion have limitation to analyse the whole beach, carried out of partial area as like shoreline (horizontal 2D) and beach profile (vertical 2D) on account of limitation of numerical simulation. This is an important application for prevention of coastal erosion, and UAV photogrammetry is also used to 3D topographic data. This paper analyses the use of unmanned aerial vehicles (UAV) to 3D map and beach volume change. UAV (Quadcopter) equipped with a non-metric camera was used to acquire images in Songjung beach which is located south-east Korea peninsula. The dynamics of beach topography, its geometric properties and estimates of eroded and deposited sand volumes were determined by combining elevation data with quarterly RTK-VRS measurements. To explore the new possibilities for assessment of coastal change we have developed a methodology for 3D analysis of coastal topography evolution based on existing high resolution elevation data combined with low coast, UAV and on-ground RTK-VRS surveys. DSMs were obtained by stereo-matching using Agisoft Photoscan. Using GCPs the vertical accuracy of the DSMs was found to be 10 cm or better. The resulting datasets were integrated in a local coordinates and the method proved to be a very useful fool for the detection of areas where coastal erosion occurs and for the quantification of beach change. The value of such analysis is illustrated by applications to coastal of South Korea sites that face significant management challenges.
Highlights
1.1 Research BackgroundCoastal areas contain a number of different types of site of particular biological, geological, geomorphological, landscape or cultural heritage value, each with specific requirements for monitoring
To explore the new possibilities for assessment of beach volume change we have applied coastal topography of Songjung beach based on unmanned aerial vehicles (UAV) survey with high resolution, on-ground real-time kinematic (RTK)-VRS surveys
Site Preparation involves developing a layout for ground control points, checking the accuracy of the camera image used for flight planning, ensuring no obstacles are in the path of the UAV, and evaluating environmental conditions to determine if a flight can be safely undertaken
Summary
Coastal areas contain a number of different types of site of particular biological, geological, geomorphological, landscape or cultural heritage value, each with specific requirements for monitoring. Sediment volume change measurement is more useful for validating computer models of sediment transport and topographical change Acquiring such data for lager areas at short time intervals (less one year) using traditional ground based surveys would be prohibitively time consuming and expensive. UAV systems receive high demands in business, research institutes and industries since UAV is one of the simple and cheapest equipment in image acquisition. It can fly at low altitude and provides very high resolution image of the ground surface. To explore the new possibilities for assessment of beach volume change we have applied coastal topography of Songjung beach based on UAV survey with high resolution, on-ground RTK-VRS surveys
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